Doric Instruments 473 Series Portable Digital Calibrators Calibration Manual - Manual (Page 3)

3.1.3 mA Input Calibration
a. Observing proper polarity, connect precision mA source to mA input jacks of
instrument.
b. Set instrument to mA input mode.
c. Set mA A/B switch to “A” position.
d. Adjust source output to 0.000 mA.
e. Adjust R5 on Display board for a display reading of .00 mA.
f. Adjust source output to 25.000 mA
g. Adjust R20 on Analog board for a display reading of 25.00 mA.
h. Repeat steps 3.1.3 through 3.1.3g until no further adjustments are required for correct
display readings.
i. Carefully reassemble instruments
CALIBRATION COMPLETED