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Operating Manual
1.0
Description
The Model 121 is a 3-Channel DC Differential Amplifier designed to be used with bridge type or
differential output accelerometers, pressure transducers, and load cells. The amplifier offers an
exceptionally low input noise floor of <20μVrms and wide bandwidth, out to 200 kHz, ideal for transient
measurements.
With the Model 121, the user can instantly program gain or output scaling, and activate Auto-Zero
controls for each channel using the front panel push-buttons. Its microprocessor employs a sleep mode
in order to eliminate clock frequencies after setup is complete. Useful features are shunt calibration, 0 to
25Vdc programmable sensor voltage supply, and a selection of user-installed 4-pole Butterworth LP filter
modules.
1.1
Key Features
Three-Channel DC Differential Voltage Amplifier
Programmable Excitation Voltage
200 kHz Bandwidth (-3dB corner)
Gain Range from 0 to 9999
Alternative 4-pole Butterworth LP filter Module
Auto-Zero
Shunt Calibration
AC & DC Monitoring
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
www.meas-spec.com
4 of 19
TM
+1 949-716-5377
t&m@meas-spec.com
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