TM 11-6625-1614-15
Model 410C
Section V
Paragraphs 5-1 to 5-11
5-1. INTRODUCTION.
SECTION V
MAINTENANCE
5-2. This section contains maintenance procedures
for the Model 410C Electronic Voltmeter.
5-3. TEST EQUIPMENT REQUIRED.
5-4. The test equipment required to maintain and
adjust the Model 410C is listed in Table 5-1. Equi-
pment having similar characteristics may be substi-
tuted for items listed.
5-5. PERFORMANCE CHECKS.
5-6. The performance checks presented in this
section are front panel operations designed to com-
pare the Model 410C with it’s published specifications.
These operations may be incorporated in periodic
maintenance, post repair and incoming quality control
checks. These operations should be conducted before
any attempt is made at instrument calibration or
adjustment. During performance checks, periodically
vary the line voltage to the Model 410C, ± 10% on either
115v or 230 v operation. A 1/2 hour warm-up period
should be allowed before these tests are conducted.
5-7. ALTERNATE VOLTAGE SOURCE.
5-6. Should it be necessary to use the
Voltmeter Calibrator to conduct these Performance
Checks, the arrangement described in Figure 5-1 will
provide the necessary voltage values required. How-
ever; the Model 738BR Voltmeter Calibrator is the
5-9. Mechanical METER ZERO.
a. Turn instrument on.
Allow at least a 20
minute warm-up period.
b. Turn voltmeter off, and allow 30 seconds for
all capacitors to discharge.
c. Rotate mechanical zero-adjustment screw on
front panel clockwise until pointer reaches zero,
moving up scale.
d. If for some reason the pointer should over-
shoot zero, repeat step c until desired results
are obtained.
e. When pointer has been positioned at zero,
rotate zero-adjust screw slightly counterclock-
wise to free it. If meter pointer moves to the
left during this action, repeat steps c and e.
5-10. DC VOLTMETER OPERATION.
5-11. ACCURACY CHECK (DCV).
Model 738AR
a. Set the Model 410C FUNCTION SELECTOR
to the +DCV position; RANGE switch to. 015 V .
Connect Model 410C DCV and COM cables to the
Voltmeter Calibrator
Model 738BR) output
preferred instrument for these operations.
terminals.
Figure 5-1. Alternate Voltage Source
01556-2
5-1
