S e c t i o n IV. MAINTENANCE OF VOLTMETER
The voltmeter should be cleaned periodically to
This section contains maintenance instructions
remove accumulation of dust and dirt on its
applicable to operator, organizational, and
exterior sections. A soft cloth dampened in a mild
direct support activities. Maintenance of the
solution of soap and water or isopropyl alcohol
voltmeter by these activities is limited to the
pressure air can also be used to remove dirt
a. Fuse, knob,andinputconnector
particles lodged between surfaces.
Isopropyl Alcohol is flammable and toxic
4-8. Removal/ Replacement
to eyes, skin, and respiratory tract. Wear
a . F u s e R e p l a c e m e n t . The input power fuse F
protective gloves and goggles/face shield.
1 is located on the rear panel of the voltmeter. If
Avoid repeated or prolonged contact. Use
replacement is necessary, install a 3AGC 1/2A,
only in well-ventilated areas (or use
250 volt fuse.
approved respirator as determined by local
b . K n o b R e p l a c e m e n t . The SAMPLE RATE,
safety/industrial hygiene personnel). Keep
RATIO FULL SCALE, and DC ZERO knobs are
away from open flames, sparks or other
replaced as follows:
sources of ignition.
(1) Loosen setscrew using an Allen
wrench and remove knob
( 2 ) R o ta t e shaft o f c o n tr o l f u l ly c lo ck w is e .
D O N O T use aromatic hydrocarbons or
( 3 ) I n s ta l l k n o b o n c o n tr o l shaft a n d s e c u r e
chlorinated solvents for cleaning. These
with Allen setscrew.
solutions react with components on the
(4) Check range of control by rotating
front panel and will damage them beyond
knob. If necessary, loosen setscrew and
reposition knob to obtain appropriate range;
tighten setscrew as required .
c. I n p u t Connector R e p l a c e m e n t . I n p u t
The voltmeter should be checked for correct
connectors (binding posts) on the front or rear
o p e r a t io n after a n y ma i n t e n a n c e i s p e r f o r me d .
panel are replaced as follows:
(1) Unscrew the binding post from the
7. Successful completion
of these checks insures
that the voltmeter is again ready for operation.
(2) Install the replacement binding post on
the mounting stud and tighten as required.