PDF File - Frequency Devices

Models 900CT & 900BT
Single Channel –
Tunable Active
Filter Instrument
Certified
Description
Frequency Devices’ Models 900CT & 900BT
instruments are single channel; 8-pole low-pass
or high-pass, front panel tunable filter
instruments. The controls allow the user to select
a corner frequency between 0.1 Hz and 49.9 kHz
with a resolution of 1:499 for each of the four
selectable ranges.
The instrument exhibits an input impedance of 1
MΩ shunted by 47pF to a single ended signal
source. When configured in the differential mode,
the instrument has a common mode rejection
ratio (CMRR), which exceeds 60dB; in this mode
the instrument presents an input impedance of 2
MΩ’s shunted by 47pF to a double-ended single
source. Front panel gain control also enables the
operator to select a gain factor of 0, 10, or 20dB.
Models
900CT
900BT
Standard operational features include:
1) Adjustable Frequency Control
2) Differential Input Amplifiers
3) Adjustable Gain Control
4) Off-set Adjustment
5) Bypass Control
6) BNC Connectors for Signal I/O
The optional battery powered 900BT is
particularly well suited to applications requiring
isolation from an electrically noisy primary power
source.
Compact size and manual rotary switch front
panel controls make 900 instruments a popular,
cost effective, easy-to-use solution for signal
conditioning applications in the following areas:
Anti-aliasing Filters
Biomedical/Biotechnology Applications
Data Recording/Playback
Data Smoothing
EKG/EEG Signal Filtering
FDM/PCM Signal Filtering
Medical Research
Industrial Process Control
Seismic Analysis
Vibration Analysis
Standard AC Powered
AC Powered, with battery option
Available Low-Pass Filters:
Part#
#Poles
900L8B
8
900L8L
8
900L8E
8, 6 zero
900L8EY
8, 6 zero
900L8D80
8, 6 zero
900L8D100
8, 6 zero
Filter Type Page
Butterworth
6
Bessel
6
Elliptic, 1.77
6
Elliptic, 2.00
6
Constant Delay 7
Constant Delay 7
Available High-Pass Filters:
Part#
#Poles
900H8B
8
900H8E
8, 6 zero
900H8EY
8, 6 zero
Filter Type
Butterworth
Elliptic, 1.77
Elliptic, 2.00
Block Diagram
Front & Rear panel descriptions
General Specifications:
Ordering Information
Page
8
8
8
2
4&5
9
10
1
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model 900 Series
Instrument Block Diagram
Certified
BLOCK DIAGRAM
GAIN (dB)
INPUT
10dB
0dB
20dB
A
A-B
+
OUT
8-POLE TUNABLE
FILTER
DIFF
AMP
A
OUTPUT
AMP
BYPASS
OFFSET
NULLED
B
CORNER
FREQUENCY
TUNING
OFFSET
1
0
2
3
TYPICAL
FRONT PANEL
BNC CONNECTOR
TYPICAL
ADJUSTMENT
FUNCTION
CORNER FREQUENCY HZ
5
5
4
4
6
4
MULTIPLIER
10
1
100
6
3
7
3
7 0.1
2
8
2
8
1
0
9
1
0
FRONT PANEL
9
2
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model 900 Series
Initial Setup Procedure
Certified
Initial Setup
Select desired operating voltage 115 Vac
or 230 Vac. See note "Q" on Page 5.
Set the OFFSET control for a zero-volt
reading on the scope or DVM.
Set the POWER ON/OFF Switch to ON.
A continuously lit POWER lamp indicates
proper internal DC voltages, an essential
requirement for battery-powered models.
Allow the instrument a three-minute
warm-up period to achieve thermal
equilibrium.
Subsequent changes of CORNER
FREQUENCY and GAIN control settings
will introduce a small dc output offset,
which should be zeroed for critical
applications.
Leaving all other controls unchanged, set
the Input Switch to (A-B) and apply a
5Vdc signal simultaneously to input BNCs
(A) and (B). The voltage measured at the
OUT BNC should be 5 - 5 = 0 Vdc. This
completes
preliminary
test
and
adjustment.
To perform initial adjustment and/or
operational testing, set the remaining front
panel controls as follows:
a)
The
three
base
CORNER
FREQUENCY
switches
and
the
MULTIPLIER to the desired corner
frequency…
Corner Frequency Selection
To select a corner frequency, simply set
the three CORNER FREQUENCY
switches and the MULTIPLIER switch for
the desired numerical value.
b) The OFFSET control to approximately
mid-range…
c) The GAIN switch to the desired value…
The CORNER FREQUENCY switch
weightings follow standard decimal
positional conventions.
d) The BYPASS switch to OUT…
e) The INPUT switch to ground ( ).
Connect a dc-coupled oscilloscope, of
vertical sensitivity 10mV/CM or better, or
a digital voltmeter (DVM) to the instrument
front panel BNC connector labeled OUT.
Circuit model illustrating the relationship between a filter’s differential
input and amplifier and external signal and error sources.
DIFFERENTIAL
INPUT AMPLIFIER
0d
INPUT SIGNAL AND
NOISE VOLTAGE SOURCES
R SA
20
dB
*
(+)
VA
GAIN = K
RCM+
VCM
VB
RCM-
SIGNAL
COMMON
RSB
FILTER/
BYPASS
DIFF
AMP
-
OUTPUT
AMPLIFER
(-)
B
-Vs
COUPLED
POWER LINE
NOISE VOLTAGE
OUT
+
RD
The accuracy of the corner frequency is
improved by selecting the largest possible
base frequency and down scaling by the
MULTIPLIER. The greatest accuracy is
obtained with the largest base 400, and
the 0.1X MULTIPLIER switch setting.
Relative accuracy of selected 40 Hz
actual corner frequency for different
multiplier switch settings.
B
4
0
0
BASE
FREQ
Msd
C
0
4
0
D
0
0
4
X
MULT
Lsd
E
0.1X
1X
10X
RELATIVE
TUNING ACCURACY
GREATEST
LESS
LEAST
The differential input
The instrument input utilizes a differential
input amplifier to reject prevalent forms of
electrical interference, while presenting
desirable input characteristics to the
signal source requiring filtering.
The
differential input configuration is ideal for
measuring the difference between two
values rather than the values themselves.
Bridge circuits utilizing strain gages,
thermocouples and a variety of other
types of transducers generate differential
full-scale output voltages in the order of
millivolts that are often superimposed
upon volt-level reference and noise
values.
B
10
dB
A
The B, C and D switches combined can
select base corner frequency values
ranging from 1 to 499 Hz in 1 Hz steps
with switch weightings as just described.
COM
Vo = K(VA - VB) + Vcm/CMRR : WHERE
K = 1, 10 AND 10 FOR GAIN SETTINGS
OF 0, 10 AND 20dB RESPECTIVELY.
+Vs SEE TEXT FOR REMAINING TERMS.
(+)
(-)
The importance of CMRR
In actual system environments, each
signal and power return conductor can
generate
an
interference
voltage
proportional to the net conductor
resistance and the electrical current level.
Any such interference voltages appear as
common mode signals to the amplifier,
and are rejected as such.
* DENOTES FRONT PANEL ACCESS
AC POWER SUPPLY
VP
OR
INTERNAL BATTERIES
SIGNAL
COMMON
3
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model 900 Series
Front Panel Description
Certified
Location of Front Panel Terminals and Controls
A
B
M
C
L
D
K
E
J
I
D. CORNER FREQUENCY Selector Switch
(0-9): This ten position rotary switch selects
the 1’s digit of the desired corner frequency
between 0 and 9 in discrete increments of 1.
A. POWER Status Lamp: This red LED
indicates whether or not the power to the
analog filter circuitry of a Model 900CT/BT
Series instrument is ON. With the power
switch in the ON position, the LED glows
continuously indicating internal DC power
levels are correct. If LED does not light when
power switch is in ON position, 1) reset
instrument by cycling POWER switch OFF
and ON, 2) Check line fuse.
E. MULTIPLIER Selector Switch: This fourposition rotary switch multiplies by a factor of
either 0.1, 1.0, 10 or 100, the aggregate value
set on the 3 CORNER FREQUENCY selector
switches. (B, C & D)
For 900BT models only: If LED is flashing,
recharge batteries, approximately 30 minutes
of operation remains.
F. GAIN Switch: This three-position toggle
switch selects an overall filter gain of 0, 10, or
20 dB.
B. CORNER FREQUENCY Selector Switch
(0-400Hz): This five position rotary switch
selects the 100’s digit of the corner
frequency designator.
The switch
selectable values are 0, 100, 200, 300 and
400 in five discrete steps.
G. BYPASS Switch: OUT and IN setting of
this two position toggle switch routes the input
signal to the internal filter or around it,
respectively. E.g. OUT position - no Bypass,
the signal passes through the filter. In either
case, the gain switch remains operational.
C. CORNER FREQUENCY Selector Switch
(0-90):
This ten-position rotary switch
selects the 10’s digit of the desired corner
frequency between 0 and 90, in discrete
increments of 10.
H. INPUT Switch: This three position toggle
configures the instrument for either differential
inputs (A-B), a single-ended input (A), or input
nulling ( ) which grounds both the (A) and (B)
input terminals.
H
G
F
I. & J. (A) and (B) Input Terminals: This pair
of shielded, female BNC connectors accept
signal inputs (A) and (B). The instrument
applies a non-inverting gain to input (A) and
an equal but opposite inverting gain to input
(B) while the GAIN switch sets the magnitude
of differential gain to 0, 10, or 20 dB. The
BNC shields have been internally connected
to the instrument ground.
K. GROUND ( ) Terminal: This “Banana”
type test jack provides neat and secure
access to the internal ground. This terminal
is a convenient junction for grounding
external
system
and
measurement
instrumentation and/or apparatus.
L. OUT Terminal: This terminal is a female
BNC connector. The shield on the BNC is
internally connected to the instrument ground.
M. OFFSET Adjust:
This adjustment is
intended to zero the offset that results from
the instrument’s own circuitry and does not
provide for wide range offset to remove dc
input signals.
4
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model 900 Series
Rear Panel Description
Certified
Location of Rear Panel Terminals, Controls and Labels
Model
900CT
O
N
P
Model
900BT
N. IDENTIFICATION LABEL: This label
identifies the Model number, filter type,
serial number, date of manufacture,
operating power limits and fuse
requirements of the instrument.
O. AC POWER CONNECTION: Denotes
plug and fuse location.
P. POWER ON/OFF Switch: Is a twoposition toggle switch on the back panel
that interrupts/completes the power
circuit.
Q. VOLTAGE Selector Module: For 230
Vac operation, use a screwdriver blade to
pry open the module door (entry point
next to window), remove the red fuse
cartridge, replace the 0.2 Amp, 250 V fuse
with a 0.1 Amp, 250 Volt fuse, remove the
shorting clip in the other leg and replace it
with a second 0.1 Amp fuse. Turn the
module 180 degrees, re-insert and close
the module door. The numerals 230V will
now show in the module window. Reverse
procedure to change back to 115V.
Q
5
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model
Transfer Function
Range fc, fr
Theoretical Transfer
Characteristics
Tuning Resolution
Passband Ripple
Pass Band Voltage
Gain
(non-inverting)
Stopband
Attenuation
Cutoff Frequency
Accuracy
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
Total Harmonic
Distortion @ 1 kHz
Wide Band Noise
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
8 Pole
Low Pass Filters
Certified
900L8B
900L8L
8-Pole
Butterworth
Filter Specifications
8-Pole
8-Pole, 6 zero
Bessel
Elliptic
8-Pole, 6 zero
Elliptic
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
Appendix A
Page 9
Appendix A
Page 4
Appendix A
Page 24
Appendix A
Page 25
1 part in 499
within each decade
0.0 dB
1 part in 499
within each decade
0.0 dB
1 part in 499
within each decade
±0.035 dB
1 part in 499
within each decade
-0.05 dB
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
48 dB/Octave
48 dB/Octave
-80 dB typ.
-100 dB typ.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-360°
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-182°
±0.01%/°C typ.
±0.02%/°C max.
-0.035 dB
-323°
±0.01%/°C typ.
±0.02%/°C max.
-0.05 dB
-419°
0.12 dB
3.01 dB
60.0 dB
80.0 dB
1.91 dB
3.01 dB
60.0 dB
80.0 dB
0.35 dB
3.01 dB
60.0 dB
80.0 dB
0.05 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.00 fc
2.37 fc
3.16 fc
900L8E
0.80 fc
1.00 fc
4.52 fc
6.07 fc
900L8EY
1.00 fr
1.13 fr
1.67 fr
1.77 fr
1.00 fr
1.06 fr
1.83 fr
2.00 fr
<-90 dB typ.
<-90 dB typ.
<-90 dB typ.
<-88 dB typ.
200µVrms typ.
200µVrms typ.
250µVrms typ.
250µVrms typ.
50µVrms typ.
50µVrms typ.
75µVrms typ.
75µVrms typ.
6
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model
Transfer Function
Range fc
Theoretical Transfer
Characteristics
Tuning Resolution
Passband Ripple
Pass Band Voltage
Gain
(non-inverting)
Stopband Attenuation
Cutoff Frequency
Accuracy
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
Total Harmonic
Distortion @ 1 kHz
Wide Band Noise
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
8 Pole
Low Pass Filters
Certified
900L8D80
Filter Specifications
8-Pole, 6 zero
Constant Delay
900L8D10
8-Pole, 6 zero
Constant Delay
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
Appendix A
Page 21
Appendix A
Page 22
1 part in 499
within each decade
0.15 dB
1 part in 499
within each decade
0.15 dB
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
-80 dB typ.
-100 dB typ.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-306°
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-311°
3.01 dB
60.0 dB
80.0 dB
3.01 dB
80.0 dB
100.0 dB
1.00 fc
3.08 fc
3.57 fc
1.00 fc
4.45 fc
5.20 fc
<-90 dB typ.
<-88 dB typ.
200µVrms typ.
200µVrms typ.
50µVrms typ.
50µVrms typ.
7
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Model
8 Pole
High Pass Filters
Certified
900H8B
900H8E
900H8EY
Filter Specifications
8-Pole
8-Pole, 6 zero
Butterworth
Elliptic
8-Pole, 6 zero
Elliptic
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
Appendix A
Page 29
Appendix A
Page 37
Appendix A
Page 38
1 part in 499
within each decade
1 part in 499
within each decade
1 part in 499
within each decade
0.0 dB
±0.035 dB
-0.05 dB
Pass Band Voltage
Gain
(non-inverting)
0 ± 0.2 dB to.100kHz
0 ± 0.5 dB to 120kHz.
0 ± 0.2 dB to.100kHz
0 ± 0.5 dB to 120kHz.
0 ± 0.2 dB to.100kHz
0 ± 0.5 dB to 120kHz.
Powert Bandwidth
120 kHz
120 kHz
120 kHz
48 dB/Octave
-80 dB typ.
-100 dB typ.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
-360°
±0.01%/°C typ.
±0.02%/°C max.
-0.035 dB
-323°
±0.01%/°C typ.
±0.02%/°C max.
-0.5 dB
-419°
80.0 dB
60.0 dB
3.01 dB
0.00 dB
80.0 dB
60.0 dB
3.01 dB
0.03 dB
0.00 dB
100.0 dB
80.0 dB
3.01 dB
0.03 dB
0.00 dB
Transfer Function
Range fc, fr
Theoretical Transfer
Characteristics
Tuning Resolution
Passband Ripple
Stopband
Attenuation
Cutoff Frequency
Accuracy
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
Total Harmonic
Distortion @ 1 kHz
Wide Band Noise
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
0.31 fc
0.42 fc
1.00 fc
2.00 fc
0.56 fr
0.60 fr
0.88 fr
1.00 fr
2.00 fr
0.50 fr
0.55 fr
0.94 fr
1.00 fr
2.00 fr
<-88 dB typ.
<-88 dB typ.
<-88 dB typ.
400µVrms typ.
400µVrms typ.
500µVrms typ.
100µVrms typ.
100µVrms typ.
150µVrms typ.
8
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
General
Specifications
Certified
Input Characteristics
Input Impedance:
Differential
Single Ended
Input Voltage:
Linear Differential*
Max Safe Differential
Max Safe Common Mode
Bias Current
Common Mode Rejection ratio with
2kΩ source unbalance and 0 dB Gain
Output Characteristics
Full Power Bandwidth**
Related Output
Short Circuit Output Current
Output Protection
Output Impedance
Offset Voltage
2 MΩ Shunted by 47pF
1 MΩ Shunted by 47pF
20V p-p (Gain Set at 0 dB)
Any Continuous Value between ±100V
Any Continuous Value between ±100V
30 pA typ.; 175 pA max.
> 60dB, DC to 50kHz
DC to 600kHz
10V p-p for RL = 50Ω
20V p-p for RL = 2kΩ
±100 mA continuous
±200 mA without damage
(Short Circuit to Ground Only)
50 Ω
Adjustable to Zero at Front Panel
(Range ±500mV dc)
Power Supply
AC Line Power Operation
900CT
900BT
Voltage Frequency Range-Rear Panel:
115 V
230 V
Fuse
105 to 125Vac @ 50/60Hz
210 to 250Vac @ 50Hz
115 V=0.2 Amp., 230 V = 2X-0.1 Amp.
Battery Operation (900BT)
Time for full Charge
Battery Life
Battery Charger
Charge Status Indicator (Front Panel)
Battery Operation
10 – 12 hours
Approx. 500 Charge/Discharge Cycles
Automatic Uninterruptible
3 Status Levels
6 Hours typ.
Temperature
Operating Temperature:
Storage Temperature:
0 °C to +50 °C
-25 °C to +70 °C
Mechanical
Dimensions
Weight
900CT
900CT
Case Material
Color
10 Watts max.
15 Watts max.
3.7"H x 8.66"W x 10.6"D
9.4cmH x 22.0cmW x 27.0cmD
3.5 lbs; 0.157 kgs
4.9 lbs; 0.219 kgs
ABS plastic
Light Gray
* Signal plus common mode voltage cannot exceed 20V peak to peak for a linear output.
** Output characteristics of input amplifier with filter in BYPASS mode.
9
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Certified
Ordering Information
A. AVAILABLE MODELS
1. 900CT
2. 900BT
1
Standard AC powered model
1
AC powered with battery powered option
2
FILTER TRANSFER FUNCTIONS AVAILABLE
B. LOW-PASS
BUTTERWORTH
1.
900L8B
BESSEL
2
900L8L
ELLIPTIC
3.
900L8E
4.
900L8EY
CONSTANT DELAY
5.
900L8D80
6.
900L8D10
C. HIGH PASS
BUTTERWORTH
ELLIPTIC
7.
8.
9.
900H8B
900H8E
900H8EY
8-pole
8-pole
8-pole, 6 zero elliptic, 1.77, 80 dB
8-pole, 6 zero elliptic, 2.00, 100 dB
8-pole, constant delay 80 dB
8-pole, constant delay 100 dB
8-pole
8-pole, 6 zero elliptic, 1.77, 80 dB
8-pole, 6 zero elliptic, 2.00, 100 dB
ORDERING INFORMATION
2
Filter Type
Transfer Function
L – Low – Pass
H – High – Pass
B – Butterworth
L – Bessel
D80 – Constant Delay (-80dB)
D10 – Constant Delay (-100dB)
E - elliptic 1.77 (-80dB)
EY – elliptic 2.00 (-100dB)
900CT/900L8L
Model
1
C – Standard AC Power
B – AC Powered, with Battery Power Option
Poles
8
NOTE:
1.
2.
See page 5, item “Q” Voltage selector Module. At time of shipment, Voltage is pre-selected in the 115 VAC position. For 230 VAC
operation, this module must be rotated 180 degrees and an additional fuse must be added.
All filters tunable from 0.1 Hz to 49.9 kHz.
We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements,
recommendations or suggestions herein in conjunction with our conditions of sale, which apply, to all goods supplied by us. We assume no responsibility for the use of these statements,
recommendations or suggestions, nor do we intend them as a recommendation for any use, which would infringe any patent or copyright.
IN-00900CT/BT-00
10
1784 Chessie Lane, Ottawa, Illinois 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: [email protected] • Web Address: http://www.freqdev.com