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  TM 11-6625-599-12
Figure 4
Voltmeter, Electronic ME-161/U, operating
controls and indicators.
24. Types of Operation
a voltage about a nominal value (para 28 and
Caution: If the vtvm is tilted more than
29, respectively), and measure high resistances
45°, it must be set in normal upright position
between 1 and 500,000" megohms (para 2-10).
for a period of 48 hours before it will regain
its calibrated accuracy.
2-5. Starting Procedure
The vtvm may be operated as a conventional
Caution: Be sure to ground the vtvm chas-
vacuum-tube voltmeter or as a differential
sis by connecting to a three-prong receptacle.
voltmeter. It may be used to measure positive
or negative voltages from O to 500 volts (para
When only a conventional two-prong power
12
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