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.
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
Models
900CT
900BT
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
Available High-Pass Filters:
Part#
#Poles
900H8B
8
900H8E
8, 6 zero
900H8EY
8, 6 zero
Filter Type Page
Butterworth
6
Bessel
6
Elliptic, 1.77
6
Elliptic, 2.00
6
Constant Delay 7
Constant Delay 7
Filter Type
Butterworth
Elliptic, 1.77
Elliptic, 2.00
Page
8
8
8
2
4&5
9
10
Block Diagram
Front & Rear panel descriptions
General Specifications:
Ordering Information
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
FREQUENCYDEVICES [ FREQUENCY DEVICES, INC. ]
