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Model 8000-4225 Two Channel Charge Amplifier
PBS-4100 Balancing System Accessories

The Model 8000-4225 Two Channel Charge
Amplifier is used to convert accelerometer
charge signals into voltage signals.
Converted signals are then easily used by
the PBS-4100 family of engine vibration
analyzers.
Conversion of signals to voltage-mode
provides greater immunity to noise and
allows signals to be reliably transmitted over
greater distances. The charge amplifier is
normally installed at the engine. It is not
needed if another charge amplifier is already
present (as part of aircraft or test cell
equipment) or where velocity probes are
used instead of accelerometers.
Features of the Model 8900-4225 include:
Two channel operation
Individually settable gains
Built-in test signal with status lights
Individual channel test / operation
switches
Remotely powered via PBS cabling
Weather tight packaging

Model 8000-4225 Charge Amplifier

SPECIFICATIONS:

Model 8000-4225 Charge Amplifier
Number of Channels

2

Sensitivity Switch settings

1, 4, or 10 mVolts/picocoulomb individually
settable for each channel

Input

Full differential

Frequency Range

5-10,000 Hz

Output

Velocity

Dimensions

4 x 7 x 4 inches (10 x 18 x 10 cm)

Test Mode Signal

61.4 Hz test signal equal to 50% of FS output

Weight

3.5 lb (1.6 kg) max.

Cable

Many types available upon request
-7°C to 55°C (20°F to 131°F), 5-95% RH

Temperature / humidity

MTI Instruments has been a leader in rotating machinery technology for over 40 years, developing
advanced balancing systems for a wide variety of applications. PBS-4100 Portable Balancing Systems are
used around the world by satisfied customers in more than 50 nations for flight-line and test cell use. Call
toll-free 1-800-342-2203 to review your testing requirements with one of our applications engineers, and
to learn about other benefits of PBS-4100 systems.

MTI Instruments Inc.
325 Washington Avenue Extension
Albany, NY 12205