900CT/900L8D10 [FREQUENCYDEVICES]
Tunable Active Filter Instrument; 可调有源滤波器仪
| 型号： | 900CT/900L8D10 |
| 厂家： | 
FREQUENCY DEVICES, INC. |
| 描述： | Tunable Active Filter Instrument |
| 文件： | 总19页 (文件大小：814K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Models 900CT & 900BT
Tunable Active
Filter Instrument
Single Channel –
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
Standard AC Powered
AC Powered, with battery option
Available Low-Pass Filters:
Part#
900L8B
900L8L
900L8E
900L8EY
900L8D80
900L8D100
#Poles
8
8
Filter Type Page
Butterworth
Bessel
5) Bypass Control
6) BNC Connectors for Signal I/O
6
6
6
6
The optional battery powered 900BT is
particularly well suited to applications requiring
isolation from an electrically noisy primary power
source.
8, 6 zero
8, 6 zero
8, 6 zero
8, 6 zero
Elliptic, 1.77
Elliptic, 2.00
Constant Delay 7
Constant Delay 7
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
Available High-Pass Filters:
Part#
#Poles
8
8, 6 zero
8, 6 zero
Filter Type Page
900H8B
900H8E
900H8EY
Butterworth
Elliptic, 1.77
Elliptic, 2.00
8
8
8
Biomedical/Biotechnology Applications
Data Recording/Playback
Data Smoothing
EKG/EEG Signal Filtering
FDM/PCM Signal Filtering
Block Diagram
2
4 & 5
9
Front & Rear panel descriptions
General Specifications:
Ordering Information
10
Medical Research
Industrial Process Control
Seismic Analysis
Vibration Analysis
1
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Model 900 Series
Single Channel –
Certified
Instrument Block Diagram
BLOCK DIAGRAM
GAIN (dB)
INPUT
10dB
0dB
20dB
A
A-B
A
+
OUT
8-POLE TUNABLE
FILTER
DIFF
AMP
OUTPUT
AMP
-
BYPASS
OFFSET
NULLED
B
CORNER
FREQUENCY
TUNING
TYPICAL
FRONT PANEL
BNC CONNECTOR
TYPICAL
ADJUSTMENT
FUNCTION
OFFSET
CORNER FREQUENCY HZ
MULTIPLIER
5
0
2
3
5
10
6
9
1
4
1
6
4
1
100
0
3
2
3
2
4
0.1
7
8
7
8
9
1
0
FRONT PANEL
2
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Model 900 Series
Single Channel –
Certified
Initial Setup Procedure
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.
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.
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.
Subsequent changes of CORNER
FREQUENCY and GAIN control settings
will introduce a small dc output offset,
which should be zeroed for critical
applications.
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.
Allow the instrument
a
three-minute
warm-up period to achieve thermal
equilibrium.
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
To perform initial adjustment and/or
operational testing, set the remaining front
panel controls as follows:
Relative accuracy of selected 40 Hz
actual corner frequency for different
multiplier switch settings.
a)
The
three
base
CORNER
and the
completes
preliminary
test
and
FREQUENCY
switches
adjustment.
BASE
FREQ
Msd
C
0
4
0
X
MULT
Lsd
E
0.1X
1X
RELATIVE
TUNING ACCURACY
MULTIPLIER to the desired corner
frequency…
Corner Frequency Selection
To select a corner frequency, simply set
the CORNER FREQUENCY switches and
the MULTIPLIER switch for the desired
numerical value.
B
4
0
0
D
0
0
4
b) The OFFSET control to approximately
mid-range…
GREATEST
LESS
LEAST
10X
c) The GAIN switch to the desired value…
d) The BYPASS switch to OUT…
The CORNER FREQUENCY switch
weightings follow standard decimal
positional conventions.
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
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.
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,
Circuit model illustrating the relationship between a filter’s differential
input and amplifier and external signal and error sources.
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.
DIFFERENTIAL
INPUT AMPLIFIER
INPUT SIGNAL AND
NOISE VOLTAGE SOURCES
The importance of CMRR
In actual system environments, each
signal and power return conductor can
A
R
SA
*
(+)
GAIN = K
generate
an
interference
voltage
V
OUT
A
+
-
RCM+
RD
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.
V
CM
FILTER/
BYPASS
DIFF
AMP
OUTPUT
AMPLIFER
VB
RCM-
SIGNAL
COMMON
(-)
RSB
Vo = K(VA - VB) + Vcm/CMRR : WHERE
K = 1, 10 AND 10 FOR GAIN SETTINGS
B
OF 0, 10 AND 20dB RESPECTIVELY.
SEE TEXT FOR REMAINING TERMS.
+Vs
COM
-Vs
COUPLED
POWER LINE
NOISE VOLTAGE
DENOTES FRONT PANEL ACCESS
*
(-)
(+)
AC POWER SUPPLY
OR
VP
INTERNAL BATTERIES
SIGNAL
COMMON
3
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Model 900 Series
Single Channel –
Certified
Front Panel Description
Location of Front Panel Terminals and Controls
A
B
C
D
E
M
L
K
J
I
H
G
F
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.
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.
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.
E. MULTIPLIER Selector Switch: This four-
position 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)
K. GROUND ( ) Terminal: This “Banana”
type test jack provides neat and secure
access to the internal ground. This terminal
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.
is
a
convenient junction for grounding
system and measurement
external
B. CORNER FREQUENCY Selector Switch
(0-400Hz): This five position rotary switch
selects the 100’s digit of the corner
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.
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.
frequency designator.
The switch
selectable values are 0, 100, 200, 300 and
400 in five discrete steps.
M. OFFSET Adjust:
This adjustment is
C. CORNER FREQUENCY Selector Switch
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.
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.
(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.
4
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Model 900 Series
Single Channel –
Certified
Rear Panel Description
Location of Rear Panel Terminals, Controls and Labels
Feb. 03
SELECT
FUSE
NOM. FREQ.
SN: 00101
115v
(250v 1.0A)
60 Hz
900CT-9L8B
230v
(250v 0.5A)
50 Hz
Model
900CT
WARNING: Do not remove covers, no user serviceable parts inside.
Contact : Frequency Devices for service, tech@freqdev.com
MADE IN U.S.A.
O
N
P
Model
900BT
Feb. 03
SELECT
FUSE
SN: 00102
115v
(250v 1.0A)
60 Hz
900BT-9L8B
230v
(250v 0.5A)
50 Hz
NOM. FREQ.
WARNING: Do not remove covers, no user serviceable parts inside.
Contact : Frequency Devices for service, tech@freqdev.com
MADE IN U.S.A.
Q
N. IDENTIFICATION LABEL: This label
identifies the Model number, filter type,
serial number, date of manufacture,
Q. VOLTAGE Selector Module: The
power module window shows the
operating voltage (115 Vac or 230 Vac). At
time of shipment, the voltage window is
set in the 115 Vac position. For 230 Vac
operations, use a screwdriver blade to pry
open the module door, remove the red
fuse cartridge, turn it 180 degrees, re-
insert and close the module door. The
numerals 230 Vac will now show in the
module window. Repeat procedure to
change back to 115 Vac.
F u s e
h o ld e r
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 two-
position toggle switch on the back panel
that interrupts/completes the power
circuit.
O p tio n a l
s w itc h
5
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
8 Pole
Single Channel –
Certified
Low Pass Filters
Model
900L8B
900L8L
Filter Specifications
900L8E
900L8EY
8-Pole
Butterworth
8-Pole
Bessel
8-Pole, 6 zero
Elliptic
8-Pole, 6 zero
Elliptic
Transfer Function
Range fc, fr
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
Theoretical Transfer Appendix A
Appendix A
Page 4
Appendix A
Page 24
Appendix A
Page 25
Characteristics
Page 9
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
Tuning Resolution
Passband Ripple
Pass Band Voltage
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.
Gain
(non-inverting)
Stopband
Attenuation
48 dB/Octave
48 dB/Octave
-80 dB typ.
-100 dB typ.
Cutoff Frequency
Accuracy
fc
±2% max.
fc
±2% max.
fc
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
±0.01%/°C typ.
±0.02%/°C max.
-0.035 dB
±0.01%/°C typ.
±0.02%/°C max.
-0.05 dB
Stability
Amplitude
Phase
-360°
-182°
-323°
-419°
Filter Attenuation
0.12 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
1.91 dB
3.01 dB
60.0 dB
80.0 dB
0.80 fc
0.35 dB
3.01 dB
60.0 dB
80.0 dB
1.00 fr
0.05 dB 1.00 fr
3.01 dB 1.06 fr
60.0 dB 1.83 fr
80.0 dB 2.00 fr
(theoretical)
1.00 fc
2.37 fc
3.16 fc
1.00 fc
4.52 fc
6.07 fc
1.13 fr
1.67 fr
1.77 fr
Total Harmonic
Distortion @ 1 kHz
<-90 dB typ.
<-90 dB typ.
<-90 dB typ.
<-88 dB typ.
Wide Band Noise
200µVrms typ.
50µVrms typ.
200µVrms typ.
50µVrms typ.
250µVrms typ.
75µVrms typ.
250µVrms typ.
75µVrms typ.
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
6
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
8 Pole
Single Channel –
Certified
Low Pass Filters
Model
Transfer Function
Range fc
900L8D80
Filter Specifications
900L8D10
8-Pole, 6 zero
Constant Delay
8-Pole, 6 zero
Constant Delay
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
Theoretical Transfer
Characteristics
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
Tuning Resolution
Passband Ripple
Pass Band Voltage
Gain
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
0 ± 0.1 dB typ.
0 ± 0.2 dB max.
(non-inverting)
Stopband Attenuation -80 dB typ.
-100 dB typ.
Cutoff Frequency
Accuracy
fc
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
Stability
Amplitude
Phase
-306°
-311°
Filter Attenuation
3.01 dB 1.00 fc
60.0 dB 3.08 fc
80.0 dB 3.57 fc
3.01 dB
80.0 dB
100.0 dB 5.20 fc
1.00 fc
4.45 fc
(theoretical)
Total Harmonic
Distortion @ 1 kHz
<-90 dB typ.
<-88 dB typ.
Wide Band Noise
200µVrms typ.
50µVrms typ.
200µVrms typ.
50µVrms typ.
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
7
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
8 Pole
Single Channel –
Certified
High Pass Filters
Model
900H8B
900H8E
Filter Specifications
8-Pole, 6 zero
Elliptic
900H8EY
8-Pole
Butterworth
8-Pole, 6 zero
Elliptic
Transfer Function
Range fc, fr
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
0.1 Hz to 49.9 kHz
Theoretical Transfer Appendix A
Appendix A
Page 37
Appendix A
Page 38
Characteristics
Tuning Resolution
Passband Ripple
Page 29
1 part in 499
1 part in 499
1 part in 499
within each decade within each decade within each decade
0.0 dB
-0.05 dB
±0.035 dB
Pass Band Voltage
Gain
0 ± 0.2 dB to.100kHz
0 ± 0.5 dB to 120kHz. 0 ± 0.5 dB to 120kHz. 0 ± 0.5 dB to 120kHz.
0 ± 0.2 dB to.100kHz
0 ± 0.2 dB to.100kHz
(non-inverting)
Powert Bandwidth
120 kHz
120 kHz
120 kHz
Stopband
Attenuation
48 dB/Octave
-80 dB typ.
-100 dB typ.
Cutoff Frequency
Accuracy
fc
±2% max.
fc
±2% max.
fc
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.5% typ.
±2% max.
±0.01%/°C typ.
±0.02%/°C max.
-3 dB
±0.01%/°C typ.
±0.02%/°C max.
-0.035 dB
±0.01%/°C typ.
±0.02%/°C max.
-0.5 dB
Stability
Amplitude
Phase
-360°
-323°
-419°
Filter Attenuation
80.0 dB 0.31 fc
60.0 dB 0.42 fc
3.01 dB 1.00 fc
0.00 dB 2.00 fc
80.0 dB 0.56 fr
60.0 dB 0.60 fr
3.01 dB 0.88 fr
0.03 dB 1.00 fr
0.00 dB 2.00 fr
100.0 dB 0.50 fr
(theoretical)
80.0 dB
3.01 dB
0.03 dB
0.00 dB
0.55 fr
0.94 fr
1.00 fr
2.00 fr
Total Harmonic
Distortion @ 1 kHz
<-88 dB typ.
<-88 dB typ.
<-88 dB typ.
Wide Band Noise
400µVrms typ.
100µVrms typ.
400µVrms typ.
100µVrms typ.
500µVrms typ.
150µVrms typ.
(5 Hz – 2 MHz)
Narrow Band Noise
(5 Hz – 100 kHz)
8
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
General
Single Channel –
Certified
Specifications
Input Characteristics
Input Impedance:
Differential
Single Ended
Input Voltage:
2 MΩ Shunted by 47pF
1 MΩ Shunted by 47pF
Linear Differential*
Max Safe Differential
Max Safe Common Mode
Bias Current
20V p-p (Gain Set at 0 dB)
Any Continuous Value between ±100V
Any Continuous Value between ±50V
30 pA typ.; 175 pA max.
Common Mode Rejection ratio with
2kΩ source unbalance and 0 dB Gain
> 60dB, DC to 50kHz
Output Characteristics
Full Power Bandwidth**
Related Output
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)
Short Circuit Output Current
Output Protection
Output Impedance
Offset Voltage
50 Ω
Adjustable to Zero at Front Panel
(Range ±500mV dc)
Power Supply
AC Line Power Operation 900CT
10 Watts max.
15 Watts max.
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
10 – 12 hours
Approx. 500 Charge/Discharge Cycles
Automatic Uninterruptible
3 Status Levels
Battery Charger
Charge Status Indicator (Front Panel)
Battery Operation
6 Hours typ.
Temperature
Operating Temperature:
Storage Temperature:
0 °C to +50 °C
-25 °C to +70 °C
Mechanical
Dimensions
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
Weight
900CT
900CT
Case Material
Color
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, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
Models 900CT & 900BT
Single Channel –
Certified
Ordering Information
A. AVAILABLE MODELS
1. 900CT
Standard AC powered model 1
AC powered with battery powered option 1
2. 900BT
FILTER TRANSFER FUNCTIONS AVAILABLE 2
B. LOW-PASS
BUTTERWORTH
BESSEL
1.
2
900L8B
900L8L
8-pole
8-pole
ELLIPTIC
3.
4.
5.
6.
900L8E
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
900L8EY
900L8D80
900L8D10
CONSTANT DELAY
C. HIGH PASS
BUTTERWORTH
ELLIPTIC
7.
8.
9.
900H8B
900H8E
900H8EY
8-pole
8-pole, 6 zero elliptic, 1.77, 80 dB
8-pole, 6 zero elliptic, 2.00, 100 dB
ORDERING INFORMATION
Filter Type
Transfer Function 2
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.
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.
2.
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, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
8-Pole
Bessel
Appendix A
Low-Pass
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.50
0.00
0.00
-18.2
-36.4
-54.7
-72.9
-91.1
.506
.506
.506
.506
.506
.506
-0.029
-0.117
-0.264
-0.470
-0.737
0.60
0.70
0.80
0.85
0.90
-1.06
-1.45
-1.91
-2.16
-2.42
-109
-128
-146
-155
-164
.506
.506
.506
.506
.506
2
2
3 4 5 6 7
0.1
3 4 5 6 781.0
10.0
Normalized Frequency(f/fc)
0.95
1.00
1.10
1.20
1.30
-2.71
-3.01
-3.67
-4.40
-5.20
-173
-182
-200
-219
-237
.506
.506
.506
.506
.506
Delay (Normalized)
1.0
0.5
0.0
1.40
1.50
1.60
1.70
1.80
-6.10
-7.08
-8.16
-9.36
-10.7
-255
-273
-291
-309
-327
.505
.504
.502
.498
.492
1.90
2.00
2.25
2.50
2.75
-12.1
-13.7
-18.1
-23.1
-28.3
-345
-362
-402
-436
-465
.482
.468
.417
.352
.291
0.15 2
3
4
5 6 7 8 9
1.5
0.1
1.0
3.00
3.25
3.50
4.00
5.00
-33.4
-38.3
-43.1
-51.8
-66.8
-489
-509
-526
-552
-587
.241
.201
.170
.126
.077
Normalized Time (1/f sec)
Step Response
1.2
1.0
0.8
0.6
0.4
0.2
6.00
7.00
8.00
9.00
10.0
-79.2
-89.8
-99.0
-107
-114
-610
-626
-638
-647
-655
.052
.038
.029
.023
.018
-0.0
-0.2
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
0
1
2
3
4
5
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
4
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
Low-Pass
8-Pole
Appendix A
Butterworth
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.50
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-29.4
-59.0
-89.1
-120
-152
.816
.819
.828
.843
.867
.903
0.60
0.70
0.80
0.85
0.90
-0.001
-0.014
-0.121
-0.311
-0.738
-185
-221
-261
-283
-307
.956
1.04
1.19
1.29
1.40
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
Normalized Frequency(f/fc)
0.95
1.00
1.10
1.20
1.30
-1.58
-3.01
-7.48
-12.9
-18.2
-333
-360
-408
-445
-472
1.48
1.46
1.17
.873
.672
Delay (Normalized)
2.0
1.0
0.0
1.40
1.50
1.60
1.70
1.80
-23.4
-28.2
-32.7
-36.9
-40.8
-494
-511
-526
-539
-550
.540
.448
.380
.328
.287
1.90
2.00
2.25
2.50
2.75
-44.6
-48.2
-56.3
-63.7
-70.3
-560
-568
-586
-600
-611
.253
.226
.174
.139
.113
0.15 2
3
4
1.5
0.1
5 6 7 8 91.0
3.00
3.25
3.50
4.00
5.00
-76.3
-81.9
-87.1
-96.3
-112
-621
-629
-635
-646
-661
.094
.080
.069
.052
.033
Normalized Time (1/f sec)
Step Response
6.00
7.00
8.00
9.00
10.0
-125
-135
-144
-153
-160
-671
-678
-683
-687
-691
.023
.017
.013
.010
.008
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
0
1
2
3
4
5
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
9
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Constant Delay
Appendix A
Low-Pass (80 dB)
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.00
0.00
-30.7
-61.3
-92.0
-123
.852
.852
.852
.852
.852
0.017
0.058
0.099
0.105
0.50
0.60
0.70
0.80
0.85
0.034
-0.157
-0.510
-1.07
-153
-184
-215
-245
-261
.852
.852
.852
.851
.850
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
-1.44
Normalized Frequency(f/fc)
0.90
0.95
1.00
1.10
1.20
-1.89
-2.41
-3.01
-4.50
-6.39
-276
-291
-306
-336
-365
.849
.846
.841
.821
.783
Delay (Normalized)
1.0
0.5
0.0
1.40
1.60
1.80
2.00
2.25
-11.3
-17.1
-23.2
-29.1
-36.3
-417
-459
-492
-517
-542
.656
.512
.396
.312
.239
2.50
2.75
3.00
3.25
3.50
-43.4
-50.3
-57.6
-62.5
-75.4
-561
-576
-589
-599
-608
.189
.153
.127
.107
.092
2
3
4
0.15
1.5
3.75
4.00
4.25
4.50
4.75
-98.3
-86.3
-84.1
-85.1
-87.9
-616
-442
-448
-454
-458
.079
.069
.061
.054
.049
0.1
5 6 7 8 91.0
Normalized Time (1/f sec)
Step Response
5.00
5.25
5.50
5.75
6.00
-92.8
-104
-101
-93.3
-89.9
-462
-466
-289
-293
-295
.044
.040
.036
.033
.030
1.2
1.0
0.8
0.6
0.4
0.2
6.50
7.00
8.00
9.00
10.0
-86.6
-85.1
-84.1
-84.3
-84.9
-300
-305
-312
-317
-321
.026
.022
.017
.013
.011
-0.0
-0.2
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
0
1
2
3
4
5
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
21
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Constant Delay
Appendix A
Low-Pass (100 dB)
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.00
0.00
-31.1
-62.3
-93.4
-125
.865
.865
.865
.865
.865
-40
0.015
0.051
0.085
0.085
-60
-80
0.50
0.60
0.70
0.80
0.85
0.010
-0.182
-0.532
-1.09
-156
-187
-218
-249
-265
.865
.865
.865
.864
.863
-100
-120
2
2
3 4 5 67
0.1
3 4 5 678 1.0
10.0
-1.45
Normalized Frequency(f/fc)
0.90
0.95
1.00
1.10
1.20
-1.89
-2.41
-3.01
-4.50
-6.38
-280
-296
-311
-341
-370
.861
.857
.851
.828
.785
Delay (Normalized)
1.0
0.5
0.0
1.40
1.60
1.80
2.00
2.25
-11.2
-16.8
-22.5
-28.0
-34.5
-422
-464
-496
-520
-544
.650
.504
.389
.306
.235
2.50
2.75
3.00
3.50
4.00
-40.5
-46.1
-51.4
-61.5
-71.2
-563
-578
-591
-610
-624
.186
.151
.125
.090
.068
2
3
4
0.15
1.5
4.50
5.00
5.50
6.00
6.20
-81.3
-93.4
-142
-105
-105
-635
-643
-651
-476
-478
.054
.043
.036
.030
.028
0.1
5 6 7 8 91.0
Normalized Time (1/f sec)
Step Response
6.50
7.00
8.00
9.00
10.0
-106
-110
-122
-109
-106
-481
-486
-312
-318
-322
.025
.022
.017
.013
.011
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
-0.2
12.0
14.0
16.0
18.0
20.0
-105
-106
-107
-108
-109
-328
-333
-336
-339
-341
.007
.005
.004
.003
.003
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
0
1
2
3
4
5
Normalized Time (1/f sec)
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
22
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Elliptic, 1.77
Low-Pass
Appendix A
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.00
0.00
-25.7
-51.6
-77.9
-105
0.713
0.716
0.724
0.740
0.767
-0.004
-0.014
-0.024
-0.020
0.50
0.55
0.60
0.65
0.70
0.007
0.022
0.033
0.031
0.014
-133
-148
-163
-179
-196
0.811
0.840
0.872
0.908
0.946
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
Normalized Frequency(f/fc)
0.75
0.80
0.85
0.90
0.95
-0.015
-0.041
-0.046
-0.016
-0.025
-213
-232
-251
-272
-296
0.989
1.04
1.12
1.23
1.40
Delay (Normalized)
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.20
-0.035
-1.76
-8.28
-18.4
-29.3
-40.1
-51.5
-65.2
-75.0
-113.0
-83.6
-82.0
-83.7
-87.8
-85.8
-323
-392
-467
-522
-558
-578
-594
-606
-611
-616
-440
-444
-447
-450
-280
1.65
2.14
1.86
1.19
0.753
0.517
0.381
0.296
0.265
0.239
0.217
0.198
0.182
0.168
0.126
4.0
2.0
0.8
0.0
2
3
4
5 6 7 8 91.0
0.15
1.5
0.1
Normalized Time (1/f sec)
2.40
2.60
2.80
3.00
3.50
4.00
5.00
6.00
7.00
-82.0
-83.5
-88.2
-99.9
-87.2
-83.1
-82.1
-83.1
-84.6
-289
-295
-301
-305
-134
-140
-148
-154
-157
0.099
0.081
0.067
0.057
0.040
0.030
0.018
0.013
0.009
Step Response
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
8.00
9.00
10.0
-86.2
-87.8
-89.3
-160
-163
-164
0.007
0.005
0.004
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
0
1
2
3
4
5
Normalized Time (1/f sec)
Actual Corner Frequency (fc) in Hz
24
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Elliptic, 2.00
Low-Pass
Appendix A
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.00
0.10
0.20
0.30
0.40
0.00
0.00
-31.9
-64.2
-97.0
-131
0.885
0.891
0.903
0.922
0.958
-40
-0.001
-0.015
-0.040
-0.042
-60
-80
0.50
0.55
0.60
0.65
0.70
-0.001
0.000
-0.007
-0.027
-0.045
-166
-185
-204
-225
-245
1.020
1.057
1.099
1.140
1.193
-100
-120
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
Normalized Frequency(f/fc)
0.75
0.80
0.85
0.90
0.95
-0.040
-0.014
-0.001
-0.031
-0.036
-268
-291
-317
-346
-378
1.269
1.377
1.513
1.677
1.960
Delay (Normalized)
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.20
-0.046
-7.910
-21.06
-31.96
-41.51
-50.35
-58.90
-67.54
-72.04
-76.79
-81.93
-87.78
-95.04
-106.6
-106.0
-419
-525
-573
-597
-612
-623
-632
-639
-642
-645
-647
-650
-652
-654
-481
2.681
2.127
0.856
0.509
0.357
0.271
0.216
0.177
0.162
0.149
0.138
0.128
0.119
0.111
0.087
4.0
2.0
0.8
0.0
0.15 2
3
4
1.5
0.1
5 6 7 8 91.0
Normalized Time (1/f sec)
2.40
2.60
2.80
3.00
3.50
4.00
5.00
6.00
7.00
-121.3
-106.5
-105.0
-106.4
-123.6
-111.5
-105.4
-105.1
-106.0
-307
-311
-315
-318
-325
-149
-156
-160
-163
0.070
0.058
0.049
0.042
0.030
0.022
0.014
0.010
0.007
Step Response
1.2
1.0
0.8
0.6
0.4
0.2
-0.0
8.00
9.00
10.0
-107.3
-108.6
-110.0
-165
-167
-168
0.005
0.004
0.003
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
0
1
2
3
4
5
Normalized Time (1/f sec)
Actual Corner Frequency (fc) in Hz
25
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
High-Pass
8-Pole
Appendix A
Butterworth
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.10
0.20
0.30
0.40
0.50
-160
-112
-83.7
-63.7
-48.2
691
661
631
600
568
0.819
0.828
0.843
0.867
0.903
0.60
0.70
0.80
0.85
0.90
-35.5
-24.8
-15.6
-11.6
-8.06
535
499
459
437
413
.956
1.04
1.19
1.29
1.40
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
Normalized Frequency(f/fc)
0.95
1.00
1.20
1.40
1.60
-5.15
386
360
275
226
194
1.48
-3.01
1.46
-0.229
-0.020
-0.002
0.873
0.540
0.380
1.80
2.00
2.50
3.00
4.00
0.00
0.00
0.00
0.00
0.00
170
152
120
99.2
74.0
0.287
0.226
0.139
0.094
0.052
5.00
6.00
7.00
8.00
9.00
10.0
0.00
0.00
0.00
0.00
0.00
0.00
59.0
49.0
42.1
36.8
32.7
29.4
0.033
0.023
0.017
0.013
0.010
0.008
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
29
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Elliptic, 1.77
High-Pass
Appendix A
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
-40
-60
-80
-100
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.10
0.20
0.30
0.40
0.50
-89.3
-82.1
-90.6
-82.4
-87.8
164
148
131
292
450
0.440
0.459
0.495
0.559
0.671
0.55
0.60
0.70
0.80
0.85
-90.0
-60.2
-32.4
-13.1
-6.28
0.761
0.890
1.37
437
603
563
498
451
2.35
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
2.77
Normalized Frequency(f/fc)
0.90
0.95
1.00
1.10
1.20
-2.21
-0.51
-0.03
-0.01
-0.05
401
358
324
277
225
2.66
2.15
1.64
1.04
0.757
1.30
1.40
1.50
1.60
1.70
-0.03
0.01
0.03
0.03
0.03
221
201
185
172
160
0.596
0.486
0.409
0.347
0.299
1.80
1.90
2.00
2.50
3.00
0.02
0.01
0.01
-0.02
-0.02
150
141
133
105
86.9
0.260
0.229
0.203
0.123
0.083
4.00
5.00
6.00
7.00
8.00
-0.02
-0.01
-0.01
-0.01
-0.01
64.7
51.6
42.9
36.8
32.1
0.046
0.029
0.020
0.015
0.011
9.00
10.0
-0.01
0.00
28.6
25.7
0.009
0.007
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
37
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
8-Pole, 6-Zero
Elliptic, 2.00
High-Pass
Appendix A
Theoretical Transfer Characteristics
1
Frequency Response
0
-20
f/fc
Amp
(dB)
Phase
(deg)
Delay
(sec)
(Hz)
0.10
0.20
0.30
0.40
0.50
-110
-105
-114
-110
-107
168
156
323
309
654
0.338
0.348
0.367
0.397
0.445
-40
-60
-80
0.55
0.60
0.70
0.80
0.85
-78.6
-64.6
-44.1
-26.7
-18.2
646
637
615
586
565
0.480
0.524
0.669
1.001
1.401
-100
-120
2
2
3 4 5 6 7
0.1
3 4 5 6 78 1.0
10.0
Normalized Frequency(f/fc)
0.90
0.95
1.00
1.10
1.20
-9.46
533
478
419
352
308
2.315
3.604
2.681
1.416
1.018
-2.16
-0.046
-0.038
-0.001
1.30
1.40
1.50
1.60
1.70
-0.032
-0.046
-0.034
-0.016
-0.004
277
252
231
214
200
0.773
0.618
0.514
0.436
0.376
1.80
1.90
2.00
2.50
3.00
0.000
-0.003
-0.010
-0.042
-0.045
187
176
166
131
108
0.328
0.288
0.255
0.153
0.103
4.00
5.00
6.00
7.00
8.00
-0.028
-0.015
-0.008
-0.005
-0.003
80.6
64.2
53.4
45.7
40.0
0.057
0.036
0.025
0.018
0.014
9.00
10.0
-0.002
-0.001
35.5
31.9
0.011
0.009
1.Normalized Group Delay:
The above delay data is normalized to a corner frequency
of 1.0Hz.The actual delay is the normalized delay divided
by the actual corner frequency (fc).
Normalized Delay
Actual Delay =
Actual Corner Frequency (fc) in Hz
38
1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
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