AC/DC Mini Clamp Meter

User Guide
AC/DC Mini Clamp Meter
Model 380941
Introduction
Congratulations on your purchase of Extech’s DC/AC Clamp Meter. This professional meter, with
proper care, will provide years of safe reliable service.
Front Panel Description
6. One-touch DCA zero key
7. LCD Display
8. 40 segment bargraph display
1. Current sense jaw
2. Measurement Trigger
3. Function switch
4. Data Hold key
5. Max Min key
9. Positive input terminal for V, HZ and Ω
10. COM terminal
International Symbols
!
Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Safety
This meter has been designed to be safe in use, but the operator must use caution in its operation.
The rules listed below should be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
2.
USE EXTREME CAUTION when working with high voltages.
3.
DO NOT measure voltage if the voltage on the "COM" input jack exceeds 500V above earth
ground.
4.
NEVER connect the meter leads across a voltage source while the function switch is in the
current, resistance or diode mode; doing so can damage the meter.
5.
ALWAYS discharge filter capacitors in power supplies and disconnect the power when making
resistance or diode tests.
6.
ALWAYS turn off the power and disconnect the test leads before opening the back to replace
the fuse or batteries.
7.
NEVER operate the meter unless the back cover and the battery/fuse door are in place and
fastened securely.
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Operation
AC Current Measurements
WARNING: To avoid electric shock, disconnect the test leads from the meter before making current
measurements.
1)
2)
3)
Set the Function switch to the 40 or 200A AC range.
Press the jaw trigger and clamp around, fully enclosing a single conductor. Do not allow a gap between the
two halves of the jaw.
Read the ACA value on the LCD.
DC Current Measurements
WARNING: To avoid electric shock, disconnect the test leads from the meter before making current
measurements.
1)
2)
3)
4)
5)
Set the Function switch to the 40 or 200A DC range.
Press the DCA zero key to null the meter display.
Press the Trigger to open the current sense Jaw.
Fully enclose the conductor to be measured. Do not allow a gap between the two halves of
the jaw.
Read the DCA value on the LCD.
AC Voltage Measurements
WARNING: To avoid electric shock or damage to the meter, do not make any voltage
measurements that exceed the maximum specified.
1)
2)
3)
4)
Set the Function switch to the VAC position.
Insert the test leads to the meter as follows: Red lead to “V,Hz,Ω” terminal; Black lead to the
COM input.
With the pointed end of the test leads measure voltage. Remember that voltage
measurements are made in parallel with the device or circuit under test.
Read the ACV value on the LCD.
DC Voltage Measurements
WARNING: To avoid electric shock or damage to the meter, do not make any voltage
measurements that exceed the maximum specified.
1)
2)
3)
4)
Set the Function switch to the VDC position.
Insert the test leads to the meter as follows: Red lead to “V,Hz,Ω” terminal; Black lead to the
COM input.
With the pointed end of the test leads measure voltage. Remember that voltage
measurements are made in parallel with the device or circuit under test.
Read the DCV value on the LCD.
Resistance and Continuity Measurements
WARNING: To avoid electric shock or damage to the meter, remove power to the circuit under test and discharge
all capacitors.
1)
2)
3)
4)
5)
Set the Function switch to the Ω position.
Insert the test leads to the meter as follows: Red lead to “V,Hz,Ω” terminal; Black lead to the
COM input.
With the pointed end of the test leads measure resistance. Remember that resistance
measurements are made in parallel with the device or circuit under test.
Read the resistance value on the LCD.
If the resistance is less than 40Ω, the continuity beeper will sound.
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Frequency Measurements
1)
2)
3)
4)
5)
Ensure that at least 0.1A AC is detectable with an ACA measurement before measuring
Frequency.
Set the Function switch to the Hz position.
Insert the test leads to the meter as follows: Red lead to “V,Hz,Ω” terminal; Black lead to the
COM input.
With the pointed end of the test leads measure frequency
Read the Frequency measurement on the LCD in Hz.
Additional Features
Relative Measurements
1)
2)
3)
4)
Press the Zero key and the present measurement will Zero.
All subsequent measurements are displayed with respect to the zeroed reading. For example,
if a 20A reading is zeroed and a 30A reading is subsequently measured, the LCD will display
10A.
To return to normal operation, press and hold the zero key for 2 seconds.
Note that Relative mode is not available if the MIN/MAX mode is enabled.
Data Hold
To freeze a reading on the LCD, press the Data Hold key. The HOLD icon will appear and the
measurement will be held on the meter’s LCD. To release the Data Hold function and return the
meter to normal operation, press the Data Hold key again.
MIN/MAX Reading Mode
Pressing the MIN/MAX key allows the meter to display ONLY the highest and the lowest readings
encountered. Press the MIN/MAX key once to view the minimum reading, press it again to view
the maximum reading. Note that the meter will only change its displayed reading when a
measurement higher than the previous MAX or lower than the previous MIN readings is
encountered. The HOLD display icon (along with the MIN or MAX icon) will appear on the LCD in
rd
MIN/MAX mode. Pressing the MIN/MAX key a 3 time returns the meter to normal operation.
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Specifications
General Specifications
Display
3-3/4 (4000 count) Digit LCD with 40 segment bargraph
Functions
ACA, DCA, ACV, DCV, Resistance, Frequency, Continuity
Polarity
“-“ indicates negative polarity
Current sensor
Hall effect sensor type
Overload indication
Left blinking digit
DCA zero adjust
One touch zero key
Display rate
2 readings/second (20 readings/second for bargraph)
Battery
Two 1.5V AA batteries
Operating
temperature
4 F to 122 F (-10 C to 50 C)
Operating humidity
< 85% RH
Power
consumption
Approximately 10mA DC
o
o
o
o
Weight
8 oz. (225g) including battery
Dimensions
7 x 1.75 x 1.25” (178 x 45 x 32mm) (HWD)
Jaw opening
0.9” (23mm)
Standards
IEC 1010 Category III 300V, Category II 600V
Range Specifications
Function
DC Current
Range
Resolution.
Overload
protect
40A
10mA
±(1.0% +2dgts)
400A DC
0 to 150A
100mA
±(1.0% +2dgts)
400A DC
150 to 200A
100mA
±(2.2% +2dgts)
400A DC
AC Current
DC Voltage
Accuracy
50/60Hz
40 to 400Hz
40A
10mA
±(1.0% +3dgts)
±(1.5% +4dgts)
400A AC
0 to 150A
100mA
±(1.0% +3dgts)
±(1.5% +4dgts)
400A AC
150 to 200A
100mA
±(2.2% +3dgts)
±(2.5% ±4dgts)
400A AC
400V
0.1V
±(1.0% +2dgts)
AC Voltage
50/60Hz
40 to 400Hz
1000VDC
400V
0.1V
±(1.5% +2dgts)
±(2.0% +4dgts)
800V AC
Resistance
40 to 400Ω
0.1
±(1.0% +2dgts)
Beeper <38Ω
600V AC
Frequency
100 to 10k
0.01Hz
Sensitivity;
600V AC
±0.5% ±2dgts
2V, 0.1A AC
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Maintenance
Battery Replacement
1)
2)
3)
4)
When the low battery symbol appears on the LCD the batteries must be replaced.
Turn the meter off and remove the rear battery compartment screw.
Remove the battery compartment cover and replace the two 1.5V AA cells.
Replace the compartment cover and secure the screw.
You, as the end user, are legally bound (EU Battery ordinance) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries /
accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Cleaning
Caution: Use only a dry cloth to clean the plastic case.
Warranty
EXTECH INSTRUMENTS CORPORATION (a FLIR company) warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should
become necessary to return the instrument for service during or beyond the warranty period, contact the Customer
Service Department for authorization. Visit our website www.extech.com for contact information. A Return Authorization
(RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges,
freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting
from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or
repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a
specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is
limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether
written or oral, is expressed or implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most
products. Call the Customer Service Department for information on calibration services available for this product. Extech
recommends that annual calibrations be performed to verify meter performance and accuracy.
Support lines: U.S. 877-439-8324, Intl. 603-324-7800
Technical support: Option 3; E-mail: [email protected]
Repair & Returns: Option 4; E-mail: [email protected]
Product specifications subject to change without notice
Visit our website: www.extech.com
Extech Instruments Corporation, 9 Townsend West, Nashua, NH 03063
ISO 9001 Certified since 1995
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