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Operating Manual
2.7
Shunt Calibration
This function allows for the connection of either an external or internal shunt calibration resistor. The
location of the shunt calibration resistor can be selected by the User with respect to any of the legs of the
transducer under test.
When the left-right EDIT keys are pressed, the following messages will be shown alternately on the LED
display each time the up-down EDIT keys are pressed:
1. "OFF": The shunt calibration resistor is disconnected from the sensor.
2. "EL P+": The external shunt calibration resistor is connected to the Vexc(+).
3. EL P-": The external shunt calibration resistor is connected to the Vexc(-).
4. "S+ P+": The internal shunt calibration resistor (150Kohm) connected in parallel between the Vexc(+)
and Sig(+) leg of the transducer
5. "S+ P-": The internal shunt calibration resistor (150Kohm) is connected in parallel between the Vexc(+)
and Sig(-) leg of the transducer
6. "S- P+": The internal shunt calibration resistor (150Kohm) is connected in parallel between the Vexc(-)
and Sig(+) leg of the transducer
7. "S- P-": The internal shunt calibration resistor (150Kohm) is connected in parallel between the Vexc(-)
and Sig(-) leg of the transducer
2.8
Monitoring State
This function selection provides for programming the desired state of the Model 121.
The following messages will be shown alternately on the LED display each time the up-down EDIT keys
are pressed: (1) "OFF", (2) "AC", and (3) "DC".
1. "AC": RMS voltage at Vout is monitored and shown on the LED display at the rate of approximately
two (2) times per second. The values displayed on the LED display range from 0.000 to 10.00VAC.
2. "DC": DC voltage at Vout is monitored and shown on the LED display at the rate of approximately two
(2) times per second. The values displayed on the LED display range from -10.00 to 10.00VDC.
3. "OFF": The LED display will be turned OFF. This setting provides the lowest noise performance.
2.9
Fault Indication
There are three (3) fault indicators (Red LEDs) for each channel located on the front panel. The Fault
LED illuminates when the unit encounters a short circuit or an overload condition on a single channel.
The excitation voltage of the channel will then set to 0.000.
Or, if the AC power input voltage is out of range (90~120VAC or 200~250VAC), then all of the Fault
LEDs will not extinguish until the fault is corrected and the power recycled on the Model 121.
The excitation voltage of all three channels will then set to 0.000V.
Measurement Specialties, Inc.
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
www.meas-spec.com
8 of 19
TM
+1 949-716-5377
t&m@meas-spec.com
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