Output Scaling; Gain; Lp Filter; Auto-Zero - Measurement Computing 121 Operating Manual

Precision low-noise dc amplifier
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Operating Manual
2.3

Output Scaling

This function selection provides for programming the desired scaling of the output (in mV/EU) of the
amplifier.
The user can enter four significant digits ranging from 0.000 to 1000.
The output scaling will be set to the desired value after the ENTER key (in the middle of the five EDIT
keys) is pressed, and the gain will be set to the value determined by the following equation:
Amplifier Gain = ---------------------------
2.4

Gain

This function selection provides for programming the desired gain of the amplifier.
The user can enter four significant digits ranging from 0.000 to 9999.
The gain will be set to the desired value after the ENTER key (in the middle of the five EDIT keys) is
pressed, and the output scaling will be set to the value determined by the following equation:
Output Scaling = Amplifier Gain * Sensitivity
2.5

LP Filter

This function selection provides for enabling or disabling the built-in 4-pole Butterworth LP filter.
The LP filter will be turned ON or OFF after the ENTER key (in the middle of the five EDIT keys) is
pressed,
The -3dB corner frequency of the LP filter is defined by the Filter Module installed by the User.
2.6

Auto-Zero

This function selection provides for auto zeroing the DC output voltage.
Auto-Zero Adjustment Range functions when the output of the amplifier is about ±0.1VDC or
±10VDC/gain, whichever one is greater.
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
Output Scaling
Sensitivity
www.meas-spec.com
7 of 19
TM
+1 949-716-5377
t&m@meas-spec.com

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