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  TM 55-4920-431-13
ing replacement of the analog converter or a meter. If the condition of a tester is
unknown, a verification shall be performed before using the tester. Perform verifi-
cation as follows. Refer to figure 4-1 for test setup.
a.
Gain access to inside of case per paragraph 4-7.
Disconnect negative terminal wire (wire no. 50) from SPEED meter.
b.
Connect digital multimeter in series with the SPEED meter and disconnected
c.
wire, observing polarity.
d.
Set the multimeter mode selector switch to read amperes.
Be careful not to disconnect test wiring or short out
leads. Damage to components or faulty readings can
result.
Lay front panel assembly on case.
e.
Mechanically zero SPEED and TEMP meters.
f.
Connect signal converter ST93480 to tester connector J2.
g.
Turn output knob fully counter-
h.
Position dc power supply adjacent to tester.
clockwise.
i.
Connect power output terminals to dc voltage input terminals of signal con-
verter ST93480 observing polarity.
High voltage is used in operation of test equipment.
Death on contact may result if personnel fail to
observe safety precautions.
Be sure power switch is in off position and connect power cord to 100 volt
j.
source.
Connect oscillator frequency output to speed frequency input terminals of
k.
signal converter ST93480.
Turn variable attenuator knob to maximum.
l.
m. Turn attenuator select switch to 5 volt peak-to-peak setting.
n. Turn vernier frequency dial to zero Hertz.
Turn Hertz multiplier power switch to on.
o.
Connect oscillator power cable to 110 volt source.
p.
Turn gage select switch of frequency counter to AUTO.
q.
4-19
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