Measurement Computing 121 Operating Manual page 11

Precision low-noise dc amplifier
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Operating Manual
 Set Sensitivity (mV/EU)
Depress the "Select Function" push-button to select the "Sensitivity (mV/EU)" for programming,
and then the corresponding "Function LED" will illuminate and stay illuminated until the "Select
Function" push-button is pressed again to select the next function.
Modifying the value of the "Sensitivity (mV/EU)" is the same as modifying the "Voltage Exc. (V)"
using the five EDIT keys. Note not to set sensitivity to 0, otherwise the gain value will be infinite.
 Set Output Scaling (mV/EU)
The operating method is the same as above about the Voltage Exc. (V) and Sensitivity
(mV/EU).
 Set Gain
The operating method is also the same as above.
 Set LP Filter (kHz)
Depress the "Select Function" push-button to select the "LP Filter (KHz)" for programming, and
then the corresponding "Function LED" will illuminate and stay illuminated until the "Select
Function" push-button is pressed again to select the next function.
The left-right EDIT keys select the number position in the LED display, and then the selected
number position will be blinking to indicate the number selected for programming.
There will be display as "ON" or "OFF" alternately on the LED display with depress the up-down
EDIT keys each time.
The LP Filter will be enabled or disabled 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 Filter Module installed by the User.
 Set Auto-Zero
Depress the "Select Function" push-button to select the "Auto-Zero" for programming, and then
the corresponding "Function LED" will illuminate and stay illuminated until the "Select Function"
push-button is pressed again to select the next function.
The left-right EDIT keys select the number position in the LED display, and then the selected
number position will be blinking to indicate the number selected for programming. And the up-
down EDIT keys can modify the selected number.
When the left-right EDIT keys pressed, the following messages will be shown alternately on the
LED display each time the up-down EDIT keys are pressed: (1) "OFF", and (2) "ON".
1. "OFF": When the LED display "OFF", and then press the ENTER key (in the middle of the five
EDIT keys), then the unit sets all of the internal DC offset adjustments to neutral.
2. "ON": When the LED display "ON", and then press the ENTER key (in the middle of the five
EDIT keys), the unit sets the DC output voltage to zero to within ±20mVDC. This process will take
several seconds, and then the LED will display "SUCC". If the unit is unable to set the DC output
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
www.meas-spec.com
11 of 19
TM
+1 949-716-5377
t&m@meas-spec.com

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