Models 900CT & 900BT

Tunable Active

Single Channel –

Certified

Filter Instrument

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

M

Ω 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

M

Ω’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:

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

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

Standard AC Powered

900BT

AC Powered, with battery option

Available Low-Pass Filters:

Part#

#Poles

Filter Type

Page

900L8B

8

Butterworth

6

900L8L

8

Bessel

6

900L8E

8, 6 zero

Elliptic, 1.77

6

900L8EY

8, 6 zero

Elliptic, 2.00

6

900L8D80

8, 6 zero

Constant Delay 7

900L8D100

8, 6 zero

Constant Delay 7

Available High-Pass Filters:

Part#

#Poles

Filter Type

Page

900H8B

8

Butterworth

8

900H8E

8, 6 zero

Elliptic, 1.77

8

900H8EY

8, 6 zero

Elliptic, 2.00

8

Block Diagram

2

Front & Rear panel descriptions

4 & 5

General Specifications:

9

Ordering Information

10