Martel Electronics 320 - Manual (Page 34)

exit the calibration mode. To calibrate electrical or
pressure functions proceed as follows.
3. Apply a 10 volt signal to the volts input. If
adjustment is required press the CLR key. Next, enter
the correct reference voltage value. Calibration values
are entered in counts without any decimal places.
Enter 10000 for 10.000 volts. Repeat the sequence if
necessary to acquire a proper calibration. When you
are satisfied with the calibration press the Select key
to proceed to the next calibration step.
4. The next screen will display the milliamp
calibration. Calibrate the full scale mA at 20.000 mA.
Use the CLR and Select key as previously described.
5. The next prompt will be for the left pressure port.
The sequence will be zero, span, 25%, 50%, and 75%
of full scale. When using a dead weight tester the
exact percent of scale may not be possible. The
percent of scale need not be exact but, should be as
close as possible. Many times only the zero and span
will need adjustment. As in the previous sequences,
apply the correct reference, use the Clr key to clear the
reading, enter the new reference reading in counts
without decimal places, press “ent” to enter the new
value, and select key when finished to proceed to the
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