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Operating Manual
2.0
Functional Characteristics
The Model 121 can be manually programmed from the front panel by the following means:
"Channel Select" push-button
Three "channel LEDs"
One "Select Function" push-button
Eight "Function LEDs" indicating which function has been selected by the "Select Function"
push-button
Five character LED display to show the state of each function
Five "EDIT" push-buttons to change the display of the Five character LED
Three LEDs indicating if there is any fault in any of the channels.
The unit stores the settings for all of the functions in its internal memory. At power-up it will automatically
restore the settings from the last session.
2.1
Excitation Voltage
This function is used to set the amplitude of the excitation voltage output.
The user can enter four (4) significant digits ranging from 0.000 to 25.00VDC with 30mA maximum
current supply.
The excitation voltage for the sensor also can be set to dual ±12.5VDC with a different connection to the
9-pin Female D-connector.
The excitation will be set to the desired voltage level after the ENTER key (in the middle of the five EDIT
keys) is pressed.
If the unit is short circuited, or overloaded on a single channel, the excitation voltage of the channel will
indicate 0.000. The Fault LED corresponding to the channel will not extinguish until the fault is resolved
and the power on the Model 121 recycled.
2.2
Sensor Sensitivity
This function selection provides for programming the sensitivity of the transducer (in mV/EU).
EU = Engineering Unit, such as g or m/sec^2
The Model 121 uses this information to determine the gain needed to achieve the required output
scaling.
The user can enter four (4) significant digits ranging from 0.001 to 1000.
(Note: Do not set the sensitivity to 0; otherwise the gain value will be infinity.)
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
www.meas-spec.com
6 of 19
TM
+1 949-716-5377
t&m@meas-spec.com
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