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 TM 9-4910-736-14&P
(7) Connect the TEST LEADS together.
(8) Adjust ZERO ADJ OHM AND SERIES RES control for zero ohm indication.
(9) Connect TEST LEADS across 5 Kohm test resistor. The meter
should indicate 4.7 to 5.3 Kohms.
(10)
Set power supply for 12 V dc.
The meter indication should be 4.7
to 5.3 Kohms.
Disconnect the TEST LEADS.
(11)
NOTE
Other test resistors may also be used to calibrate at other
points along the scale.
g. Coil Test Circuits.
These adjustments consist of meter and current drive
calibration.
(1) Meter Calibration. Proceed as follows:
a.
Set FUNCTION switch to COIL and if not already done, connect
BAT LEADS to 12 V dc supply.
b.
Connect 2.5 V dc between terminal E27 (figure FO-2) and -12 V
BAT LEAD.
C.
Adjust trimmer potentiometer R49 (figure FO-2) for 30 KV indica-
tion on black scale of meter.
d.
Disconnect the voltage from terminal E2T and the -12 V BAT
LEAD.
(2) Current Drive Calibration. Proceed as follows:
a. Connect oscilloscope to center lug of COIL CURRENT control
potentiometer R104 (E10) (figure FO-3).
b.
Set vertical input of oscilloscope to DC mode.
c.
Set COIL CURRENT control to extreme clockwise position.
d.
Adjust trimer potentiometer R32 (figure FO-2) for 4.5 V p-p
square wave.
e.
Set COIL CURRENT control to extreme counterclockwise position.
Oscilloscope should display 2 V p-p square wave.
f.
Disconnect oscilloscope.
3-21
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