ES51968(6600counts)

ES51968(6600counts)
Dual Display/Inrush
Features
• 6,600 counts dual LCD display
• 128L QFP package
• 3.3V DC power supply
• Slow ADC Conversion rate : 2.8 times/s
• Bar-graph ADC conversion rate: 28 times/s
• Full automatic measurement
*Voltage measurement: 660.0mV – 1000V
*Current measurement: μA/mA/A
*Frequency sub-display with Voltage or Current
mode (VAHz): 66.00Hz ~ 66.00kHz
*Resistance measurement: 660.0Ω – 66.00MΩ
*Resistance measurement for Clampmeter mode:
660.0Ω – 66.00KΩ
*Capacitance measurement:
6.600nF – 66.00mF
(Taiwan patent no.: 323347, 453443)
(China patent no.: 748600)
*Frequency counter with duty cycle display:
66.00Hz – 66.00MHz
1% – 99% (< 10kHz)
• Current modes for clamp meter with ZERO
function
• AC modes with frequency dual display
• Diode measurement & continuity check
• 4 ADP modes with external reference voltage and
independent “ADP” segment on LCD panel
• Temperature mode with internal scale translation
circuit from 0C to 0F
• Push functions:
*KEY function
*Range change function
*Inrush function: ACA clampmeter only
*Relative function
*Zero function: DCA clampmeter only
• Low pass filter auto switching mode
ACA/ACV measurement
(Taiwan patent no.: 361281)
(China patent no.: 876287)
for
• Band-gap reference voltage output
• CE selection (DC/AC 1010V, DC/AC 610V)
• Serial data output (RS232 format)
• LCD segment check when power on
• Auto power off (30min/15min)
• Sleep state indicative signal output
• Re-power on
• On-chip buzzer driver
• Low battery detection
Description
ES51968 is an integrated analog-to-digital
converter (ADC) with dual 6,600-count LCD
display (4-digit main-display and 4-digit
sub-display), automatic range selection, and
3.3V DC power supply. Automatic range
selection is provided for voltage (AC/DC)
measurement,
resistance
measurement,
current
measurement,
capacitance
measurement, and frequency counter.
Expensive and bulky mechanical range
switches are not required. Other features
include inrush function, relative value display,
offset removing feature for DCA clampmeter,
data holding, maximum and minimum value
holding, duty cycle measurement, diode
measurement, temperature measurement,
continuity checking, low battery detection,
auto power off, re-power on, backlight driver,
buzzer driver and RS232 data output.
*Data hold function with data record feature
*MAX/MIN function
*Back light function
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12/06/20
ES51968(6600counts)
Dual Display/Inrush
Application
Digital multimeter
Clamp meter
Pin Assignment
Cyrustek.
com.tw
ES51968
v2.9
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12/06/20
ES51968(6600counts)
Dual Display/Inrush
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Symbol
V+
DGND
AGND
AGND
CH+
CHCIH
BUFFH
CAZH
CL+
CLCIL
CAZL
BUFFL
RAZ
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
Type
O
P/G
P/G
P/G
IO
IO
O
O
O
IO
IO
O
O
O
O
I
I
I
O
O
O
O
O
O
O
O
O
28
ACVH
O
29
30
31
32
33
34
35
36
ADI
ADO
OHMC3
OHMC2
OHMC1
VRH
VR
VA+
I
O
O
O
O
O
I
I
37
VA-
I
38
39
40
41
42
43
44
45
46
47
48
49
SGND
ADP
VR1
CACA+
R9K
R1K
NC
NC
CSH+
CSHLPFC1
G
I
I
IO
IO
O
O
IO
IO
O
v2.9
Description
Output of on-chip DC-DC converter.
Digital ground.
Analog ground.
Analog ground.
Positive connection for reference capacitor of high-speed A/D.
Negative connection for reference capacitor of high-speed A/D.
High-speed integrator output. Connect to integral capacitor.
High-speed buffer output pin. Connect to integral resistor.
High-speed auto-zero capacitor connection.
Positive connection for reference capacitor of high-resolution A/D.
Negative connection for reference capacitor of high- resolution A/D.
High-resolution integrator output. Connect to integral capacitor.
High-resolution auto-zero capacitor connection.
High-resolution Buffer output pin. Connect to integral resistor
Buffer output pin in AZ and ZI phase.
Current measurement input for 6600μA, 660mA and 66A modes.
Current measurement input for 660μA, 66mA.
Sense input for resistance/capacitance measurement
Output connection for resistance measurement
Sense low voltage for resistance/voltage measurement
Reference resistor connection for 660.00Ω range
Voltage measurement ÷10000 attenuator(1000V)
Voltage measurement ÷1000 attenuator(660.0V)
Voltage measurement ÷100 attenuator(66.00V)
Voltage measurement ÷10 attenuator(6.600V)
Buffer output of OVSG
DC signal low input in ACV/ACA mode. Connect to negative output
of external AC to DC converter.
DC signal high input in ACV/ACA mode. Connect to positive output
of external AC to DC converter.
Negative input of internal AC to DC OP Amp.
Output of internal AC to DC OP Amp.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Output of band-gap voltage reference. Typically –1.23V
Reference input voltage connection. Typically –400mV
For ADP mode. De-integrating voltage positive input. The input
should be higher than VA-.
For ADP mode. De-integrating voltage negative input. The input
should be lower than VA+.
Signal Ground.
Measurement input in ADP mode.
Measurement Input. Connect to a precise 10MΩ resistor.
Negative auto-zero capacitor connection for capacitor measurement
Positive auto-zero capacitor connection for capacitor measurement
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Cap for duty-cycle mode
Cap for duty-cycle mode
Capacitor C1 connection for internal low-pass filter
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ES51968(6600counts)
Dual Display/Inrush
50
51
52
53
54
LPFC2
LPFC3
LPFOUT
SLEEP
VBAR
55
BUZIN
56
FREQ
58 - 92 SEG35 – SEG01
93
BP4
94
BP3
95
BP2
96
BP1
97
ANNUNC
O
O
O
O
I
I
I
O
O
O
O
O
O
98
99
100
101
102
LCDCAP
HOLD
RANGE
REL_ZERO
KEY
I
I
I
I
I
103
104
105
106
107
MAX/MIN
ENIR
BKLIT
RS232
BUZOUT
I
I
I
I
O
108
BKOUT
O
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
OSC2
OSC1
SHIFT
APOSEL
VST
LPFOFF
CESEL
FC5
FC4
FC3
FC2
FC1
SLACDC
SDO
C+
CLBAT9
O
I
I
I
I
I
I
I
I
I
I
I
I
O
O
O
I
126
127
128
VVV+
P
P
O
v2.9
Capacitor C2 connection for internal low-pass filter
Capacitor C3 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Sleep mode indicator, asserts low in SLEEP mode.
In temperature mode, it is used to control decimal point.
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign.
Pull to V- to enable the BUZOUT.
Frequency counter input, offset V-/2 internally by the chip.
LCD segment line 01 – 35
LCD backplane 4
LCD backplane 3
LCD backplane 2
LCD backplane 1
Square wave output at the backplane frequency, synchronized to BP1.
ANNUNC can be used to control display annunciator. Connect a
LCD segment to ANNUNC to turn it on; connect an LCD segment to
its backplane to turn it off.
LCD bias voltage bypass capacitor
Pulse to V- to enable HOLD function.
Pulse to V- to enable manual mode and manual range selection.
Pulse to V- to enable Relative function or Zero function.
Pulse to V- to change mode. In ADP mode, if this pin is connected to
V-, the buzzer output will be off when the ADP input overflows.
Pulse to V- to enable MAX/MIN function.
Pulse to V- to enable the INRUSH function for clamp ACA mode
Back light function. Pulse low to set BKOUT pin output.
Assert low to enable serial data output.
Outputs a 2KHz audio frequency signal for driving piezoelectric
buzzer when BUZIN is low.
If BKLIT function is enabled, this pin will change from V- to V+
For 60 sec, once press BKLIT pin again within 60 sec, this pin will
Change back to V-.
Crystal oscillator output connection
Crystal oscillator input connection
Pull to V- to enable display-shift feature on duty cycle mode
Idle time selection for auto power off feature.
Pull to V- to enable the auto range voltage mode to start from 660.0V
Pull to V- to disable the internal Low pass filter in measurement
CE selection feature control pin.
Switch 5 for function selection.
Switch 4 for function selection.
Switch 3 for function selection.
Switch 2 for function selection.
Switch 1 for function selection.
Select initial state.
Serial data output
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
Low battery configuration input. If battery is used, the low battery
segment is displayed when the voltage of this pin is less than VRH
(-1.23V)
Negative supply voltage.
Negative supply voltage.
Output of on-chip DC-DC converter.
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ES51968(6600counts)
Dual Display/Inrush
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage
V+
AGND/DGND
Digital Input
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
Rating
-4V
V- -0.6 to V+ +0.6
V+ ≥ (AGND/DGND+0.5V)
AGND/DGND ≥ (V- -0.5V)
V- -0.6 to DGND +0.6
500mW
0℃ to 70℃
-25℃ to 125℃
Electrical Characteristics
TA=25℃, V- = -3.3V
Parameter
Power supply
Operating supply current
In DCV mode
Voltage roll-over error
Voltage nonlinearity
Input Leakage
Zero input reading
Band-gap reference voltage
Symbol
Test Condition
VIDD
Normal operation
ISS
In sleep mode
REV 10MΩ input resistor
Best case straight
NLV
line
VREF
Open circuit voltage for 660Ω
measurement
Open circuit voltage for other Ω
measurement
Peak to peak backplane
drive voltage
-3.5V≤ V ≤-2.2V
Internal pull-high to 0V
current
AC frequency response at 6.600V
range
3dB frequency for LPF mode
Reference voltage temperature
coefficient
Capacitance measurement
accuracy
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
TCRF
Between V- pin and
HOLD, RANGE,
KEY, FC1-FC5
BKLIT,MAXMIN
Between V- pin
and RS232
±1%
±5%
LPF auto ON when
Hz < 500Hz (+3%)
100KΩ
resister
Between
VRH
0℃<TA<70℃
6.6nF – 66mF
Min.
—
—
—
—
Typ.
-3.3
1.8
5
—
Max
—
2.5
10
±0.1
Units
V
mA
µA
%F.S1
—
—
±0.1
%F.S1
-10
-000
1
000
10
+000
PA
counts
-1.3
-1.2
-1.1
V
—
-3.3
—
V
-1.19
-1.08
-0.97
V
3.0
3.1
3.2
V
—
1.2
—
—
11
—
—
—
40-400
400-2000
—
—
7.5
µA
HZ
kHz
—
100
—
ppm/℃
-2.02
—
2.02
%F.S
-3
—
3
counts
Note:
1. Full Scale
2. When capacitance measurement (Clamp mode) is selected, the additional error 1% should be increased.
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ES51968(6600counts)
Dual Display/Inrush
Function Description
1. Dual Display
1.1 Introduction
ES51968 configures a dual display LCD driver for multi-meter applications. The dual
display includes main-display and sub-display. Each display has 4 digits to show up to 6600
counts. The simplified representation of dual display is shown below. Main-display always
shows current measurement value, however sub-display usually shows sub-measurement
mode or some special reading, for example, maximum reading, minimum reading, and
reference value of relative mode. By the dual display feature, ES51968 can also shows two
different measurement mode at the same time, for example, AC voltage with frequency,
frequency mode with duty cycle. It’s very convenient for user to observe the ac voltage and
frequency at the same time without changing the rotary switch or pushing any function
button. Other features achieved by dual display will be introduced in later sections. The full
LCD configuration is shown at section 6.1 of page 28.
Sub-Display
Main-Display
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Dual Display/Inrush
1.2 Dual display V.S. measurement mode
The main-display always shows reading in main measurement mode, and sub-display shows
reading in sub-measurement mode or special function. The configuration is shown at the
table below.
Main measurement mode Main-display Sub-display default
DC voltage
DC voltage
N/A
AC voltage
AC voltage
frequency
DC current
DC current
N/A
AC current for multimeter AC current
frequency
AC current for clampmeter AC current
frequency
Resistance mode
Resistance
N/A
Capacitance mode
Capacitance
N/A
Frequency mode
Frequency
Duty cycle
Continuity Check
Resistance
N/A
Diode mode
Voltage
N/A
Temperature mode
Temperature
N/A
ADP mode
A/D result
N/A
Note: N/A means that sub-display shows nothing if no push function is enabled.
1.3 Dual display V.S. push function
With dual display, user can observe current measurement result and special function at the
same time. In other single-display DMM, it can not show the current value when some
special function, for example, Relative, Max/Min, is enabled. In order to see the current
measurement value, the enabled function must be canceled.
Push function
Main-display
Sub-display
Enable Hold
Stop updating
Stop updating
Max/Min
Current value
Max. or Min. of current value
1
Relative
Relative value
Reference Value
2
Zero
Modified value
N/A
Inrush (waiting state) Four bars (- - - -)
Four bars (- - - -)
Inrush (done)
Current value
Inrush value
1
Relative value = Current A/D result – Reference value
2
Modified value = Current A/D result – zero offset value.
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ES51968(6600counts)
Dual Display/Inrush
2.
Operating Modes
2.1. Voltage Measurement
A re-configurable voltage divider automatically provides a suitable range in voltage
measurement mode. The following table summarizes the full-scale ranges in each
configuration.
Configuration
1
VR1
VR2
VR3
2
VR4
VR5
Full Scale Range
660.0mV
6.600V
66.00V
660.0V
1000V
Divider Ratio
1
1/10
1/100
1/1000
1/10000
Resister Connection
VR1 (10MΩ)
VR2 (1.111MΩ)
VR3 (101KΩ)
VR4 (10.01KΩ)
VR5 (1KΩ)
Note:
1.
660.0mV range only exists in manual mode.
2.
If VST (pin113) is set to V- level, the auto range mode will start from 660.0V range.
660.0mV – 66.00V ranges only exist in manual mode
2.1.2 CE selection
ES51968 has a CE selection feature archived by configuring the pin CESEL. In automatic
voltage mode, ES51968 will show OL when the voltage is over than the overflow level. If
CESEL is connected to V- or DGND, ES51968 will have a 610.0V or 1010V overflow level
in voltage mode relatively. If CESEL keeps floating, the overflow level will be set to 1510V
in DCV and ACV mode. The configuration of CESEL is listed below.
For fully automatic voltage modes:
CESEL
floating
VDGND
v2.9
DCV
1510V
610V
1010V
8
ACV
1010V
610V
1010V
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ES51968(6600counts)
Dual Display/Inrush
2.2 Resistance Measurement
A re-configurable divider automatically provides a suitable full-scale range in resistance
measurement mode. The following table summarizes the full-scale ranges and the reference
resistors in each configuration. When the function code is set to FC1~5=(0,1,0,1,0),
ES51968 enters the resistance mode for clampmeter. It only has 3 ranges from 660.0Ω to
66.00KΩ.
Configuration
OR1
OR2
OR3
OR4
OR5
OR6
Full Scale Range
660.0Ω
6.600KΩ
66.00KΩ
660.0KΩ
6.600MΩ
66.00MΩ
Relative Resistor
OR1
VR5
VR4 || VR1
VR3 || VR1
VR2 || VR1
VR1
Equivalent value
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
10MΩ
2.3 Current measurement for multimeter
ES51968 has 2 automatic and 1 manual current measurement modes for multimeter. The
following table summarizes the full-scale range of each mode. When ES51968 operates in
the current measurement modes for multimeter, It takes high input from pin IVSH or IVSL,
low input from pin SGND and reference voltage from pin VR.
1
VBAR
Mode
FC1~4
Full Scale
Input Terminal
Automatic1
1,1,0,1
1
660.0µA / 6600µA
IVSL/IVSH V.S. SGND (66mV)
Automatic2
1,1,1,1
1
66.00mA / 660.0mA
IVSL/IVSH V.S. SGND (66mV)
Manual
0,0,0,0
X
66.00A
IVSH V.S. SGND (66mV)
Note:
1. Connect VBAR to V- will disable the “µ2” / ”m2” symbol on LCD panel.
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ES51968(6600counts)
Dual Display/Inrush
2.4 Current measurement for clampmeter
ES51968 has 2 automatic and 4 manual current measurement modes for Clampmeter. The
following table summarizes the full-scale range of each mode. When ES51968 operate in
the automatic mode1&2, it takes high input from IVSH/IVSL (higher range/lower range),
low input from SGND and reference voltage from VR. When ES51968 operates in the
manual mode1~4, It takes high input from ADP, low input from SGND and reference
voltage from VA+ and VA-.
1
VBAR
Mode
FC1~4
Full Scale
Input Terminal
Automatic1
1,1,0,1
0
660.0A / 6600A
IVSL/IVSH V.S. SGND (66mV)
Automatic2
1,1,1,1
0
66.00A / 660.0A
IVSL/IVSH V.S. SGND (66mV)
Manual1
1,1,0,0
X
6.600A
ADP V.S. SGND (660mV)
Manual2
1,0,0,0
X
66.00A
ADP V.S. SGND (660mV)
Manual3
1,0,1,0
X
660.0A
ADP V.S. SGND (660mV)
Manual4
1,0,0,1
X
6600A
ADP V.S. SGND (660mV)
Note:
1. Connect VBAR to V- will disable the “µ2” / ”m2” symbol on LCD panel. Inrush mode could be active when
VBAR=0.
2. In DC current modes for clampmeter, ES51968 provides Zero function for offset removing.
2.5 Low pass filter (LPF) mode for ACA/ACV mode
A 3rd order low-pass filter with is built in ES51968. The LPF mode is active
automatically when the input AC frequency of voltage or current is less than 500Hz. That
means if the frequency is lower, the LPF mode (3dB BW = 7.5kHz typ.) will be helpful to
filter-out the high frequency noise of the main signal. When LPFOFF (pin 114) is pulled to
V-, the LPF mode will be disabled always. For Inrush mode is active, the auto LPF is active
always even LPFOFF is enable.
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Dual Display/Inrush
2.6 Capacitance Measurement
The following table summarizes the eight ranges of capacitance measurement mode.
Configuration
C1
C2
C3
C4
C5
C6
C7
C8
Full Scale Range
6.600nF
66.00nF
660.0nF
6.600uF
66.00uF
660.0uF
6.600mF
66.00mF
Relative Resistor
50k VR3
101kΩ
10.01kΩ
R9K / R1K
R9K / R1K
R9K / R1K
R9K / R1K
Measurement Period
0.35 sec
0.35 sec
0.35 sec
0.35 sec
0.7 sec
1.4 sec
1.4 sec
7.0 sec
Note:
1. In order to obtain an accurate reading, a capacitor must be discharged before measurement begins. The chip
has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the main-display
shows dIS.C
2. Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some other
apparatus.
3. The C2 range is calibrated by the VR near to the OVX pin.
4. The C1 range zero offset could be compensated by the small capacitors near to OVH pin.
5. When capacitance measurement (Clamp mode) is selected, C7-C8 range measurement period will be double
2.7 Continuity Check
Continuity check shares the same configuration with 660.0Ω manual resistance
measurement mode and has buzzer output to indicate continuity. The buzzer generates
2KHz beep whenever the reading is less than 30Ω.
2.8 Diode Measurement
Diode measurement mode shares the same configuration with 6.600V manual voltage
measurement mode and has buzzer output to indicate continuity. The buzzer generates a
2KHz sound whenever the reading is less than 30mV. If the test circuit is open or the
voltage drop between the two ports of the device(diode) under test is larger than 2V, the
LCD panel will show “OL”.
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Dual Display/Inrush
2.9 Frequency counter
In frequency mode, main-display shows frequency and sub-display shows duty cycle at the
same time. The time base of the frequency counter is derived from an external crystal
oscillator by
Tcounter =
4,000,000
Fosc
where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second time
base when a 4MHz oscillator is used. The frequency counter can select the proper range
automatically or manually. Auto-range operation extends over seven decades, from 66.00Hz
to 66.00MHz. The following table summarizes the full-scale range of the frequency counter.
Range
FR1*
FR2
FR3
FR4
FR5
FR6
FR7
Full Scale
66.00Hz
660.0Hz
6.600KHz
66.00KHz
660.0KHz
6.600MHz
66.00MHz
*If input frequency is less than 6.0Hz, ES51968 will show 0.00Hz
2.10 Temperature measurement mode
Temperature measurement mode takes input signal from ADP pin and reference voltage
from (VA+ - VA-). ES51968 has a built-in ºC-to-ºF scale translation circuit, and only needs
an external ºC scale application circuit. The application circuit for ºF scale is not required.
In temperature measurement mode, the default range is 6600 ºC or 9999 ºF. The VBAR pin
is used to control the first decimal point (DP1) on the LCD panel. When VBAR is pulled to
V-, DP1 will be turned on and the full scale becomes 660.0 ºC or 999.9 ºF.
2.11 Duty Cycle measurement
The duty cycle measurement is available in frequency mode simultaneously. The duty cycle
mode range is within 1.00% to 98.90% (< 10kHz@3Vpp). The minimum resolution is
0.01%. If the source frequency duty cycle is smaller than 0.9%, the 0.00% will be shown on
the LCD display. If the duty cycle is larger than 98.9%, the OL will be shown on the LCD
sub-display. If the SHIFT pin is pull to V-, a display shifted feature is available for
duty-cycle mode. The minimum resolution is 0.1% when SHIFT is active. When the
frequency is zero, the duty cycle display will be 0.00% or OL shown.
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Dual Display/Inrush
2.12 Auto power off and idle time selection
ES51968 has a default auto power off function. If the meter is idle for more than the given
Idle Time, the chip automatically turns the power off. The idle time to trigger the auto
power off function is determined by pin ‘APOSEL’. If pin APOSEL is connected to V-, the
Idle Time will be set to 30 minutes. If pin APOSEL is connected to DGND or floating, the
Idle Time will be set to 15 minutes. When APO happens, the state of the meter is saved. The
APO sign on the LCD panel indicates whether the auto power off is enabled or not. In some
cases, user might want to disable Auto power off. There are two ways to disable this feature
as following:
1. Power on the meter when any of the push functions, except for HOLD, is pressed down.
2. In addition, when RS232 output is active, the auto power off function is also disabled.
Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until
HOLD is pressed again.
2.13 Sleep
The meter enters sleep mode after auto power off. The SLEEP pin asserts low (V-) in the
sleep mode, and asserts high (V+, not 0V) after re-power on.
2.14 Re-power on
After auto power-off, pushing any of the push function or changing the rotary mode can
turn on the meter again. If the meter is re-powered on by changing the rotary mode, the
saved state is cleared. If the meter is re-powered on by push functions, the chip restores the
saved state and enters HOLD mode. The LCD displays the saved value.
v2.9
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Dual Display/Inrush
3. Measurement Mode Switching
Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5, and
KEY. When FC5 is high, the measurement mode list is below.
SLACDC
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
FC1
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
0
0
FC2
0
1
1
0
1
1
0
0
0
0
0
1
0
1
1
0
1
1
0
1
0
0
0
0
0
1
0
1
1
1
FC3
1
0
1
0
1
0
0
1
0
1
0
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
1
1
0
0
FC4
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
Mode
Voltage Measurement
12
Auto DC Current Measurement(µA)
12
Auto DC Current Measurement(mA)
1
66A DC Current Measurement(A)
—
2
Manual DC 6.600A
2
Manual DC 66.00A
2
Manual DC 660.0A
2
Manual DC 6600A
Resistance Measurement
Continuity Check
Resistance Measurement
Frequency Measurement
Capacitance Measurement
Temperature Measurement
Voltage Measurement
12
Auto AC Current Measurement(µA)
12
Auto AC Current Measurement(mA)
1
66A AC Current Measurement(A)
2
Manual AC 6.600A
2
Manual AC 66.00A
2
Manual AC 660.0A
2
Manual AC 6600A
*ADP0 (6600)
*ADP1 (660.0)
*ADP2 (66.00)
*ADP3 (6.600)
3
Capacitance Measurement (Clamp)
Temperature Measurement
Resistance Measurement
X means “don’t care”.
Function of KEY
DCV ↔ ACV
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
—
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
DCA ↔ ACA
Ω ↔ Continuity
Continuity ↔ Diode
Ω ↔ Continuity ↔ Diode
—
—
℃ ↔ ℉
ACV ↔ DCV
ACµA ↔ DCµA
ACmA ↔ DCmA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
ACA ↔ DCA
—
—
—
—
—
℉ ↔ ℃
Ω ↔ Diode
*When FC5 is high, the ADP0, ADP1, ADP2 and ADP3 modes can display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 2.3.
2
These modes could be designed for clampmeter current modes, please refer to section 2.4.
3
The external protection resistance of OVH path is allowed to be 2kΩ PTC+ max 2kΩ fixed resistor. The OVX
capacitor should be modified from 220pF  1nF.
v2.9
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ES51968(6600counts)
Dual Display/Inrush
When FC5 is low, the KEY function is disable. The measurement mode list is below.
SLACDC
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
FC1
1
1
1
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
0
0
FC2
0
1
1
0
1
1
0
0
0
0
0
1
0
1
1
0
1
1
0
1
0
0
0
0
0
1
0
1
1
1
FC3
1
0
1
0
1
0
0
1
0
1
0
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
1
1
0
0
FC4
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
Mode
DC Voltage Measurement
12
Auto DC Current Measurement(µA)
12
Auto DC Current Measurement(mA)
1
66A DC Current Measurement(A)
－
2
Manual DC 6.600A
2
Manual DC 66.00A
2
Manual DC 660.0A
2
Manual DC 6600A
Resistance Measurement
Continuity Check
Diode Measurement
Frequency Measurement
Capacitance Measurement
Temperature Measurement (℃)
AC Voltage Measurement
12
Auto AC Current Measurement(µA)
12
Auto AC Current Measurement(mA)
1
66A AC Current Measurement(A)
2
Manual AC 6.600A
2
Manual AC 66.00A
2
Manual AC 660.0A
2
Manual AC 6600A
*ADP0 (6600)
*ADP1 (660.0)
*ADP2 (66.00)
*ADP3 (6.600)
3
Capacitance Measurement (Clamp)
Temperature Measurement (℉)
4
Resistance Measurement (Clamp)
KEY
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
X means “don’t care”.
*When FC5 is low, the ADP0, ADP1, ADP2 and ADP3 modes can NOT display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 2.3.
2
These modes could be designed for clampmeter current modes, please refer to section 2.4.
3
The external protection resistance of OVH path is allowed to be 2kΩ PTC+ max 2kΩ fixed resistor. The
OVX capacitor should be modified from 220pF  1nF.
4
This mode has 3 ranges only from 660.0Ω (with continuity check) to 66.00KΩ.
v2.9
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ES51968(6600counts)
Dual Display/Inrush
4. Push function
All the enabled push functions will be reset when the measurement mode is changed by
rotary switch. Change measurement mode by KEY function will reset enabled Range, Hold,
Max/Min, REL, Inrush and Zero functions. The following table lists the available function
versus every measurement mode.
Function
Range
Hold
Max/Min
REL
Zero
Inrush
O
O
O
O
X
X
O
O
O
O
X
X
O
O
O
AC
DC
AC
Resistance
O
O
O
O
X
X
Frequency
O
O
X
X
X
X
Capacitance
O
O
O
O
X
X
Continuity
X
O
O
O
X
X
Diode
X
O
O
O
X
X
Temperature
X
O
O
O
X
X
ADP
X
O
O
O
X
X
Mode
Voltage
1
Current Mode
for Multimeter
2
Current Mode
for Clampmeter
Note:
1
Include automatic μA, automatic mA and manual 66A modes, please refer to section 2.3.
2
Include 2 automatic modes and 4 manual modes, please refer to section 2.4.
4.1. HOLD and Delay Hold feature
HOLD mode makes the meter stop updating the LCD panel. This mode can be nested in
most of the special modes. Enabling HOLD function in automatic mode makes the meter
switch to manual mode, but the full-scale range remains the same. ES51968 provides a
Delay HOLD feature. To activate Delay HOLD feature, press down the HOLD bottom and
last for 2 seconds. The meter will delay for 6 seconds, than enters HOLD mode. In the
6-secnod delayed time, the HOLD symbol on LCD panel will blink. HOLD function and the
delayed state can be cancelled by changing the measurement mode, pressing RANGE, or
push HOLD again.
v2.9
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ES51968(6600counts)
Dual Display/Inrush
Normal mode Push < 2s HOLD mode
(Auto/Manual) Push < 2s
(Manual)
Push > 2s
Push < 2s
Push > 2s
6sec past
Delay State
(Auto/Manual)
4.2. Range
RANGE pin switches to and from automatic and manual mode, and while in manual mode,
changes the full-scale range. The following figure shows the state transition.
Automatic
Mode
1 push < 1 sec
Manual
Mode
1 push > 1 sec
Measurement Mode
Range up
Auto
Manual
VRi → VRi + 1,
V(DC/AC)
VR2 – VR5
VR5 → VR1
R1 → R2,
Auto µA(DC/AC)
R1 – R2
R2 → R1
R1 → R2
R1－R2
Auto mA(AC/DC)
R2 → R1
66 A(DC/AC)
fixed
fixed
R1 → R2
Auto 66A/660A
R1－R2
(DC/AC)
R2 → R1
R1 → R2
Auto 660A/6600A
R1－R2
(DC/AC)
R2 → R1
Ci → Ci + 1,
Capacitance
C1 – C8
C8 → C1
ORi → ORi + 1,
Ω
OR1 – OR6
OR6 → OR1
ORi → ORi + 1,
Ω (Clamp)
OR1 – OR3
OR3 → OR1
Continuity
fixed
fixed
Diode
fixed
fixed
FRi → FRi + 1
Frequency
FR1 – FR7
FR7 → FR1
1 push < 1 sec
Control Range
Initial Range
660.0mV – 1000V
6.600V
660.0µA – 6600µA
660.0µA
66.00mA – 660.0mA
66.00mA
66.00A
66.00A
66.00A – 660.0A
66.00A
660.0A – 6600A
660.0A
6.600nF– 66.00mF
6.600nF
660.0Ω – 66.00MΩ
660.0Ω
660.0Ω – 66.00KΩ
660.0Ω
660.0Ω
6.600V
660.0Ω
6.600V
66.00Hz – 66.00MHz
66.00Hz
Note: Pushing RANGE resets all existing special modes.
4.3. KEY
See Section “Measurement Mode Switching” for the function of this pin.
v2.9
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ES51968(6600counts)
Dual Display/Inrush
4.4. REL + HOLD
In REL mode, the main-display shows DN+K - DN(relative value), where N = 1, 2,
3, … ,and the DN value is shown on sub-display. DN(reference value) is the last value
before REL is pushed, and DN+K is the current value. The meter returns to normal operation
if REL is pressed again. Pressing HOLD in REL mode makes the meter stop updating the
LCD panel.
push REL
Original State
(Auto/Manual)
push HOLD
〝REL〞active.
push REL
〝REL〞and〝H〞active.
Hold the relative value
The relative value
push HOLD
Note: It’s possible that relative value exceeds 6,600 or –6,600 counts, but never exceeds
9,999 or –9,999 counts. Such relative values are displayed. The LCD shows OL in REL
mode only if DN or DN+K is more than 6,600 counts or the relative value is more than 9,999.
4.5. Max/Min + HOLD
The meter displays maximum or minimum value of input in Max/Min mode. When
Max/Min is pressed for the first time, sub-display shows maximum value. Sub-display
shows minimum value, when it is pressed again. Main-display always shows current value
in Max/Min mode. The meter returns to normal operation if Max/Min is pressed and held
for longer than one second. Pressing HOLD in Max/Min mode makes the meter stop
updating the maximum or the minimum value.
1 push<1s
Original state
(Automatic/manual)
1 push>1s
“MAX” active
max value
1push<1s
1 push>1 sec
“MIN” active
min value
1push<1s
Push HOLD
Push HOLD
“MIN” “H” active
“MAX” “H” active
hold max value. 1push<1s hold min value.
1push<1s
v2.9
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ES51968(6600counts)
Dual Display/Inrush
4.6. Relative + Max/Min + HOLD
Max/Min mode can be nested in REL mode. Sub-display shows maximum or minimum
value which is relative to the reference and shows the reference value when Max/Min is
pressed in REL mode. Main-display always shows current relative value. Pressing HOLD
under REL + Max/Min makes the meter stop updating the LCD panel.
Original State
(Auto/Manual)
Push REL
MD: Main-Display
SD: Sub-Display
Push REL
〝REL〞active.
MD: relative value, SD: reference value
Push Max/Min
Push Max/Min > 1s
〝REL〞and〝Max〞active.
〝REL〞and〝Min〞active.
〝REL〞〝Max〞〝Min〞
SD: Maximum rel. value
SD: Minimum rel. value
blink. SD: Reference value
Push Max/Min
Push Max/Min
Push HOLD
〝REL〞,〝Max〞,
〝H〞active. Hold
max. rel. value
Push HOLD
〝REL〞,
Push Max/Min
〝Min〞,
〝H〞active. Hold
min. rel. value
Push Max/Min
Push HOLD
〝REL〞
〝Max〞
,
〝Min〞
,
,
〝H〞blink. Hold the
reference value
Push Max/Min
v2.9
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ES51968(6600counts)
Dual Display/Inrush
4.7. INRUSH function
ES51968 provides an INRUSH function for AC current measurement for clampmeter to
dectect the starting-up current of a motor. Push ENIR key to enable the INRUSH function.
In INRUSH mode, main-display and sub-display all show “- - - -“ until the motor starting
up and being detected. If the starting-up current is detected, ES51968 execute the inrush
current measurement and held the INRUSH value with 100ms integration period at
sub-display. Then ES51968 enters normal run and the main-display shows the normal run
current value. When the inrush current measurement is done, press ENIR could enter
INRUSH mode again. To exit INRUSH mode, press ENIR key more than one second. Enter
INRUSH mode in automatic ACA modes will force the range be locked in manual range. To
have the detail application circuit, please refer to application circuit. Any change of the
component value may have influence on the INRUSH characteristic. So it’s not
recommended to have any change on these component value. For INRUSH function, an
external true RMS-to-DC ES636 IC must be required. The flow chart of INRUSH function
is shown below.
Press KEY>1sec
Normal
State
Press KEY
Inrush Mode
Inrush Mode Detected
”Main-display: normal run”
”Wait for signal”
“Sub-display: INRUSH value”
Press KEY<1sec
v2.9
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ES51968(6600counts)
Dual Display/Inrush
4.8. ZERO function
In manual DC 6.600A, 66.00A, 660.0A and 6600A, auto DC 66.00A/660.0A and auto DC
660.0A/6600A mesurement modes, ES51968 provides Zero function to remove the residual
current value. Push ZERO bottom less than one second to enter Zero mode. In Zero mode,
main-display shows DN+K - DN, where N = 1, 2, 3, … , DN is the last conversion value
before Zero is pushed, and DN+K is the current conversion value. Sub-display shows nothing
if no other function is activated. If Zero is pushed again in Zero mode, main-display will
update the DN value and displays the DN+K - DN again. The meter returns to normal
operation if Zero is pressed and held for longer than one second. Pressing HOLD in Zero
mode makes the meter stop updating the LCD panel. In 2-range auto DCA modes for
clampmeter (660.0A/6600A or 66.00A/660.0A), the system will stay in automatic mode,
even if the Zero function is activated. In other words, it could achieve real automatic
operation. In automatic mode, Zero function could not be entered from higher range, but it
could be still activated if current range is lower one. This is because most residual current
value is so small that the range should stay at lower one in automatic mode. When enter
Zero mode from lower range, the system will store the nonzero counts (residual current
value). If the range goes up to higher one automatically, the non-zero counts will be divided
by ten. So this function will still work well in automatic modes.
State diagram for Zero mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’ Active
Press Zero < 1s
Main-display: DN+K - DN
State diagram for Zero + HOLD mode:
Original State
Press Zero
Press Zero > 1s
‘Zero’ Active
Press Zero < 1s
Main-display: DN+K - DN
Press Hold
‘Zero’ ‘Hold’ Active
v2.9
LCD stops updating
21
12/06/20
ES51968(6600counts)
Dual Display/Inrush
State diagram for Zero + Max/Min + HOLD mode:
Original State
Press Zero
Press Max/Min
Press Zero > 1s
‘Zero’ Active
MD: DN+K - DN
SD: No data
Press Max/Min > 1s
‘Zero’ ‘Max’ Active
MD: DN+K - DN
SD: Max. DN+K - DN Value
Press HOLD
Press Zero < 1s
‘Zero’ ‘Min’ Active
MD: DN+K - DN
SD: Min. DN+K - DN Value
Press Max/Min < 1s
‘Zero’ ‘Max’ ‘Hold’ Active
SD: Max. DN+K - DN Value
Press HOLD
‘Zero’ ‘Min’ ‘Hold’ Active
SD: Min. DN+K - DN Value
Press Max/Min < 1s
v2.9
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ES51968(6600counts)
Dual Display/Inrush
5. Serial Data Output
The RS232 function will be activated if the RS232 pin is pulled to and asserts at V-. The
serial data sent to SDO pin once every A/D conversion cycle. The data format complies
with JIS 7Bits transmission code with a baud rate of 19230. The host can use RS232
interface to read the data. A single data packet includes a start bit (always 0), 7 data bits, an
odd parity check bit, and a stop bit (always 1). The high and low voltage levels correspond
to DGND and V- respectively. SDO remains at 1 (high) when it is inactive. Hence the start
bit (0) could be used as the triggering signal to begin the reading process. The following
figure shows the data format of a single packet. The LSB is sent first and the MSB is sent
last.
single package
0V
0
-3V
D0 ~D6
LSB
p 1
P
MSB
One data block consists of 17 packets, or 170 bits. The following figure shows the format of
a data block. The M_range or S_range packet indicates the full-scale range of main
measurement mode or sub-measurement mode. M_digit3 through M_digit0 are the
conversion result of main measurement mode, and S_digit3 through S_digit0 are the
conversion result of sub-measurement mode(Hz or duty). The function packet indicates the
measurement mode of the meter. Status, option1, option2 and option3 give the status of the
meter. CR and LF are delimiters used to separate the blocks.
all package
0
10
M_range
0
10
S_range
10
M_digit1
0
10
10
0
Option1
1
S_digit2
10
Function
10
Option2
M_digit2
S_digit3
S_digit0
1
10
10
10
0
M_digit3
M_digit0
S_digit1
10
1
Status
10
Option3
1
CR
1
LF
v2.9
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ES51968(6600counts)
Dual Display/Inrush
5.1. FUNCTUON
This packet indicates the measurement mode of the meter. The following table summarizes
the transmitted code for each mode. Note that the encoding of this packet is different from
the encoding of FC1-FC5 switch.
Code
0111011
2
0111101
2
0111111
0110000
0111001
0110011
0110101
0110001
0110010
0110110
0110100
0111110
Measurement Mode
Voltage
Auto µA Current
Auto mA Current
66 A current
Manual A Current
Ω
Continuity
Diode
Frequency
Capacitance
1
Temperature
ADP
VBAR=0
Auto µA Current
Auto mA Current
Don’t care
VBAR=1
Auto 660.0A/6600A
Auto 66.00A/660.0A
Don’t care
1
When the function code = 0110100, the TF bit in the Status packet determines whether the unit is Celsius or
Fahrenheit.
2
When the function code = 0111101 or 0111111, the measurement mode is determined by VBAR bit of
STATUS packet.
5.2. RANGE
This packet indicates the full-scale range of the meter. When the meter operates in
continuity mode or diode mode, this packet is always 0110000 since the full-scale ranges in
these modes are fixed. The following table lists the code for each range in each
measurement mode.
Ω
Code
V
*2-range auto A
66 A Manual A ADP
0110000 6.600V Lower Range(IVSL) 66.00 A 6.600A ADP3 660.0Ω
0110001 66.00V Higher Range(IVSH)
66.00A ADP2 6.600KΩ
0110010 660.0V
660.0A ADP1 66.00KΩ
0110011 1000V
6600A ADP0 660.0KΩ
0110100 660.0mV
6.600MΩ
0110101
66.00MΩ
0110110
0110111
*It includes auto 660.0/6000µA, 66.00/660.0mA, 66.00A/660.0A, 660.0A/6000A.
v2.9
24
Frequency Capacitor
66.00Hz
6.600nF
660.0Hz
66.00nF
6.600KHz 660.0nF
66.00KHz 6.600µF
660.0KHz 66.00µF
6.600MHz 660.0µF
66.00MHz 6.600mF
66.00mF
12/06/20
ES51968(6600counts)
Dual Display/Inrush
5.3. Mdigit_3 – Mdigit_0 and Sdigit_3 – Sdigit_0
Mdigit_3 – Mdigit_0 is the measurement result of main measurement mode. This result is
shown on main-display of LCD panel. Sdigit_3 – Sdigit_0 is the measurement result of
sub-measurement mode, for example, frequency in AC voltage/current mode or duty cycle
in frequency mode. This result will be shown on sub-display of LCD panel. Mdigit3 and
Sdigit3 is the most significant digit, and Mdigit0 and Sdigit0 is the least significant digit.
Digit
0
1
2
3
4
5
6
7
8
9
Code
0110000
0110001
0110010
0110011
0110100
0110101
0110110
0110111
0111000
0111001
5.4. STATUS
The format of this package is shown below. The TF field is meaningful only when the
Function packet indicates Temperature mode. In Temperature mode, the TF is 1 if the unit is
°C and is 0 of the unit is °F. BATT field is one when battery low condition is true. In ACA
clamp mode, the Judge bit indicates the inrush key was pushed and the waiting state has
been triggered. When Judge field is set to high(check the last one), the inrush value which is
shown on sub-display will be Mdigit_3~Mdigit_0 of the same packet. The Judge bit is also
available in duty cycle mode. If the Judge bit is 1, the final result should be calculated by
(100-X) % which X is the output data from Sdigit_3~Sdigit0. If the Judge bit is 0, then the
final data is X %. The VBAR will be 1 only when the VBAR pin is connected to V-.
0
BIT6
v2.9
1
BIT 5
1
BIT 4
TF
BIT 3
BATT
BIT 2
25
Judge
BIT1
VBAR
BIT 0
12/06/20
ES51968(6600counts)
Dual Display/Inrush
5.5. OPTION 1
DC field indicates that the meter operates in DC measurement mode, either voltage or
current. AC field indicates that the meter operates in AC measurement mode, either voltage
or current. AUTO field is set to 1 if the meter operates in automatic mode, and is set to 0
when the meter operates in manual mode. SIGN field indicates whether the minus sign of
main measurement on the LCD panel is on or off.
0
BIT 6
1
BIT 5
1
BIT 4
DC
BIT 3
AC
BIT 2
AUTO
BIT 1
SIGN
BIT 0
1
BIT 5
1
BIT 4
OLM
BIT 3
OLS
BIT 2
BIT1
BIT 0
5.6. OPTION 2
0
BIT 6
OLM bit is 1 when the main measurement mode is over range. OLS bit is 1 when the
sub-measurement mode (Hz or duty) is over range in voltage/current with frequency or
frequency with duty cycle modes.
5.7. OPTION 3
VAHz bit is set to high when the sub-display is available for HZ mode of ACV/ACA. If
MAX/MIN or REL key is pushed actively, the Hz mode will be inactive and the VAHz bit
will be set to low.
0
BIT 6
1
BIT 5
1
BIT 4
BIT 3
BIT 2
BIT 1
VAHz
BIT 0
5.8. CR
Carriage return. The transmitted code is 0001101.
5.9. LF
Line feed. The transmitted code is 0001010.
v2.9
26
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ES51968(6600counts)
Dual Display/Inrush
6. Miscellaneous
The conditions, which the meter turns on the buzzer, include:
(1) Changing measurement mode generates one beep.
(2) Pressing any of the push functions generates one beep, if the function is valid.
(3) Power on and re-power on generate one beep.
(4) Input overflow in voltage and current mode generates one beep every 0.3 seconds (or
3.33 beeps per second.)
(5) Continuity(diode) check generates a continuous 2KHz beep whenever the
measurement is less then 30Ω(30mV)
(6) Auto power off generates a 2KHz beep which lasts for 1.5 seconds.
The following figures show the output waveform from the BUZOUT pin.
0.5 mS
(a) Continuous 2KHz beep
0.15 sec
0.3 sec
(b) 3.33 beep/sec
v2.9
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ES51968(6600counts)
Dual Display/Inrush
6.1.
LCD Panel
S01
S02
BP1 ADP0 ADP1
S03
S04
S05
S06
S07
S08
S09
S10
S11
S12
APO
AC
MINUS
4F
4A
4B
3F
3A
3B
2F
DC
4E
4G
4C
3E
3G
3C
2E
BP2 ADP2 ADP3 RS232 LBAT
bar7
bar8
bar11
bar12
bar13
bar14
bar17
bar18
bar15
bar16
bar19
bar20
4D
DP3
bar3
bar4
bar5
bar6
bar9
bar10
bar21
bar22
S13
S14
S15
S16
S17
S18
BP1
2A
2B
1F
1A
1B
µ2
BP2
2G
2C
1E
1G
1C
BP3
2D
BP3
bar-
bar0
BP4
bar1
bar2
DP2
1D
BP4 bar38
bar39
bar40
bar41
bar42
bar43
bar44
S25
S26
BP1
S1B
BP2
bar23
bar24
bar25
bar26
bar27
bar28
bar29
bar30
bar31
bar32
bar33
bar34
bar35
bar36
S19
S20
S21
S22
S23
S24
n
m2
µ1
V
A
m1
F
℃
℉
3D
M
K
Ω
Hz
bar45
bar46
bar47
bar48
bar49
bar50
bar51
bar52
bar53
bar54
bar55
bar56
S27
S28
S29
S30
S31
S32
S1A
S2B
S2A
S3B
S3A
S4B
S4A
S1G
S1F
S2G
S2F
S3G
S3F
S4G
S4F
BP3
S1C
S1E
S2C
S2E
S3C
S3E
S4C
SMINUS
MIN
ZERO
BP4
S1D
SDP1
S2D
SDP2
S3D
SDP3
S4D
S4E
HOLD
REL
bar37
S35
S34
S33
S32
S31
S29
S30
DP2
%
bar57
bar58
bar59
bar60
bar63
bar64
bar61
bar62
bar65
bar66
S33
S34
S35
K2
Hz2
AUTO INRUSH
MAX MANU
S27
S28
S25
S26 S24
MAX MIN HOLD
AUTO MANU ZERO REL
INRUSH
%
K2 Hz2
BP1 ADP0 APO
AC
ADP1
DC
BP2 ADP2 LBAT
ADP3 RS232
℃℉
µ2 m2 V A
n µ1 m1 F
M K Ω Hz
66
BP3
0
BP4
S01 S02
v2.9
10
S03 S04
20
30
S05 S07
S09
S06 S08
S10
40
50
S11 S13 S14 S16 S17 S19 S21
S12
S15
S18 S20
28
60
S22 S23
12/06/20
ES51968(6600counts)
Dual Display/Inrush
LCD Backplane Waveform
V- +3.1
V- +3.1
V-
V-
V- +3.1
V- +3.1
V-
V-
V- +3.1
V- +3.1
VV- +3.1
VV- +3.1
V-
6.2. LCD display on condition
LCD Annunciator
V
A
Ω
F
%
Hz
ADP1
ADP2
ADP3
ADP4
DC
AC
AUTO
MANU
HOLD
REL
Max / Min
ZERO
INRUSH
m1
µ1
n
m2
µ2
M
v2.9
Condition
In voltage measurement mode, and diode measurement mode.
In current measurement mode.
In resistance measurement mode, and continuity mode.
In capacitance measurement mode.
In continuity check mode.
In diode mode.
In duty cycle measurement.
In frequency mode.
When ADP1 mode is active
When ADP2 mode is active
When ADP3 mode is active
When ADP4 mode is active
In DC voltage or DC current mode.
In AC voltage or AC current mode.
When automatic full scale range selection is enabled.
In manual mode.
When HOLD function is enabled.
When Relative function is enabled.
When Max/Min function is enabled.
When ZERO function is enabled.
When INRUSH function is enabled.
In capacitor measurement mode and the full scale range is in the order of mF.
In capacitor measurement mode and the full scale range is in the order of uF.
In capacitor measurement mode and the full scale range is in the order of nF.
In voltage or current measurement mode and the full scale range is in the order of 10-3.
In current measurement mode and the full scale range id in the order of uA.
In resistance measurement mode and the full scale range is in the order of MΩ
29
12/06/20
ES51968(6600counts)
Dual Display/Inrush
K
℃
℉
APO
RS232
v2.9
In resistance measurement mode and the full scale range is in the order of KΩ
In temperature measurement mode and when the unit is ℃
In temperature measurement mode and when the unit is ℉
When auto power off function is enabled.
When RS232 output is enabled.
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ES51968(6600counts)
Dual Display/Inrush
6.3. Operating Timing
ES51968 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The
timing of each phase is listed below. The Bar-graph ADC is 10X faster than slow ADC.
*Voltage / Ohm /ADP / Manual Current (for clampmeter) measurement:
Phase
ZI
AZ
INT
DINT
Lo-speed
60ms
24ms
100ms
166ms
Hi-speed
6ms
2.4ms
10ms
16.6ms
*Current mode for multimeter / Current mode for clampmeter
Phase
ZI
AZ
INT
DINT
Lo-speed
60ms
24ms
1000ms
166ms
Hi-speed
6ms
2.4ms
100ms
16.6ms
*Capacitance measurement:
Range
6.600nF
66.00nF
660.0nF
6.600μF
66.00μF
660.0μF
6.600mF
66.00mF
Total Measurement Time
0.35sec
0.35sec
0.35sec
0.35sec
0.70sec
1.40sec
1.40sec(max)
7.0sec(max)
*Frequency + Duty cycle mode measurement
In range 66.00Hz~66MHz, the measurement cycle = 1.05 sec
P.S. In the frequency measurement with auto mode, if the range is changed, the internal
clock rate will increase ten times and the new measurement cycle becomes 1/10 times of
the original cycle until the range is stable.
v2.9
31
12/06/20
uA
SWSPDT
1
R1
90
R2
9
SW2
SW3
SW10
SW11
SW12
uA
uA
mA
mA
A
R6
IVSH
IVSL
100
C12
2
C13
C5
C15
220nF
22nF
47nF
SW4
220nF
470nF
R21
R7
R14
R15
R16
R20
10nF
V-
C21
100nF
470K
150K
100K
100K
Detailed
V+
ADO
1
56K
VR
VA+
VA-
J3
R13
OVH
OVSG
100
1K
10.01K
101K
1.111M
TEST5
ACVL
ACVH
C22
7.5V
0.1uF
V + ZR6
10uF
Power Switch
5.6V
0.1uF
22nF
C6
C2
10uF
C1
ZR5
Regulator DC3.3V
C14
C17
470K
C18
C23
SW13
ACV RMS
220nF
R9
R10
R11
R12
R8
+
R3
0.9
R4
R5
Q1
0-100pF 0-100pF
+
1
0.001
0.099
Metallized Polypropylene Film Capacitor : C17
Metallized Polyester Capacitor : C18
Polyester Capacitor : C14 , C16
Current measurement input terminals should be protected by
voltage clamping devices.
SW1
J1
1
C11
220pF
Q2
C19
C9
VR2
10K
+
D
mA
20A
Gnd
J5
VR1
50K
R19
27K
C24
4.7uF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
3
U1
V+ V-
V+
DGND
AGND
AGND
CH+
CHCIH
BUFH
CAZH
CL+
CLCIL
CAZL
BUFL
RAZ
IVSH
IVSL
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
TEST5
ACVL
ACVH
ADI
ADO
OHMC3
OHMC2
OHMC1
VRH
VR
VA+
VASGND
100K
10M
1uF
C8
470nF
4
Y1
4MHz
ES51968_QFP_128
+
2.2uF
KEY
REL
RANGE
HOLD
LCDCAP
ANNUC
BP1
BP2
BP3
BP4
SEG01
SEG02
SEG03
SEG04
SEG05
SEG06
SEG07
SEG08
SEG09
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
C29
102 KEY
101 REL_ZERO
100 RANGE
HOLD
99
98
ANNUNC
97
BP1
96
BP2
95
BP3
94
BP4
93
SEG01
92
SEG02
91
SEG03
90
SEG04
89
SEG05
88
SEG06
87
SEG07
86
SEG08
85
SEG09
84
SEG10
83
SEG11
82
SEG12
81
SEG13
80
SEG14
79
SEG15
78
SEG16
77
SEG17
76
SEG18
75
SEG19
74
SEG20
73
SEG21
72
SEG22
71
SEG23
70
SEG24
69
SEG25
68
SEG26
67
SEG27
66
SEG28
65
V-
C7
0.1uF
Q7
S1
5
FC1
FC2
FC3
FC4
FC5
SLACDC
HOLD
RANGE
REL_ZERO
KEY
MAX/MIN
Inrush
BKLIT
Size
B
Date:
File:
SW14
SW15
SW16
SW17
SW18
SW22
200
200
BKLIT
Inrush
MAX/MIN
KEY
10uF
V-
V-
REL_ZERO
RANGE
HOLD
FC5
SLACDC
FC4
FC3
FC2
FC1
C3
1
2
3
4
5
6
7
C4
500K
- VS
+ VS
10uF
14
13
12
11
10
9
8
R29 10K
U2
ES636
Vin
+ VS
En
NC
- VS
NC
CAV
NC
dB COMMON
BUF out
RL
BUF in
Iout
VR5
+ VS
C25
4.7uF
Number
14-Apr-2009
F:\Protelfile\KA026.ddb
6
R30
200
Sheet of
Drawn By:
6
+
ACVH
Revision
Ver:4
ES51968_RMS(ES636) Circuit(Inrush)
Title
- VS
SW20
SW19
SW9
SW8
SW7
SW6
SW5
Function Switch
FIN
( For ACV/ADP mode )
VR4
SW-SPDT
VR3
( For IVSH/IVSL mode )
RMS Circuit
J4
1
C30 22uF
Q4
R28 2.2K PTC
ADO
+
Q3
+
Q6
R27 200
5
+
9K
C28 470pF
LPF 3dBBW= 7.5KHz
4
+
ADP
R25
C26
R26
BKOUT
BUZOUT
RS232
BKLIT
Inrush
MAX/MIN
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
VIN
V-
1K
100pF
J6
J2
R23 10K
R24
Detailed
C20
2.2nF
1
uA / mA
1
SW21
SW_RC
Q5
BZ1
Buzzer
Hi-impedance Buzzer
3
VBAR
BUZIN
FREQ
SLEEP
R/C/D/Cont
Buzzer Circuit
BUZOUT
R22 10K
2
2.2uF
C31
SDO
SLACDC
FC1
FC2
FC3
FC4
FC5
CESEL
LPFOFF
VST
APOSEL
En_Shift
22nF
C
B
A
1
R18 1.5K PTC
LBAT9
C16
C27
Close to IC
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
V+
VVLBAT9
CC+
SDO
SLADC
FC1
FC2
FC3
FC4
FC5
CESEL
LPFOFF
VST
APOSEL
SHIFT
OSC1
OSC2
BKOUT
BUZOUT
RS232
BKLIT
ENIR
MAX/MIN
ADP
VR1
CACA+
R9K
R1K
NC
NC
CSH+
CSHLPC1
LPC2
LPC3
LPFOUT
SLEEP
VBAR
BUZIN
FREQ
NC
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
470nF
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
C10
180K
R17
D
C
B
A
12/06/20
32
v2.9
+
ES51968(6600counts)
Dual Display/Inrush
7. Application Circuit
ES51968(6600counts)
Dual Display/Inrush
8. Package Information
8.1
128L QFP Outline drawing
8.2
Dimension parameters
v2.9
33
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