TM 11-6625-2724-12
connected to these terminals. The negative terminal
is permanently connected to these terminals. The
The instrument is equipped with a recorder output
negative terminal is permanently connected to the
voltage which is available at rear terminals. The
chassis ground of the ME-202C/U, regardless of the
voltage is from O- to 1-volt dc and corresponds to
status of the input LOW terminal with respect to
the indication of the null meter. Instruments such as
ground.
center-zero recorders or auxiliary voltmeters may be
Section II. OPERATION OF ME-202C/U
a. Place the MODE switch to the AC or DC
position that corresponds to the measurement
Perform the following steps prior to placing the
source.
voltmeter into operation for measuring voltage or
b. Connect the circuit to be measured between the
resistance (para 3-4 through 3-7).
HI and LOW INPUT terminals. If one side of the
a. Check to see that the POWER switch is in the
voltage source is grounded, connect the grounded
OFF position.
side to the LOW INPUT terminal.
b. Set the front panel controls as follows:
c. Place the RANGE switch to the lowest range
(1) RANGE control to
possible that maintains an on-scale meter deflection.
(2) MODE switch to + DC.
The meter deflection multiplied by the RANGE
(3) Readout dials to O.
switch position is the value of the measured voltage.
(4) Check mechanical zero of meter, adjust if
Left or right m e t e r deflection during dc
necessary.
measurements corresponds to a negative or positive
(5) Set POWER switch to ON position.
polarity of the measured dc voltage.
(6) Allow the voltmeter to warmup for at least
d. Measurement of ac or dc voltages from .00002
one minute before attempting any measurements.
to 0.1 volts is accomplished on respective NULL
SEMS switch positions of 0.001 to 0.1. In this ap-
The ME-202 C/U can be used on the TVM mode to
plication, the RANGE switch is placed to the 1
measure ac or dc voltages from 10 microvolt to 1100
VOLT range and the-readout dials to .00000. The
volts dc with an accuracy of 3% of the selected
resulting meter deflection multiplied by the NULL
range. Operate the voltmeter on the TVM mode as
SENS switch position is the value of the measured
follows:
voltage.
