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