Biddle MEGGER - Page 3

HOW TO CONNECT AND OPERATE “MEGGER”
| INSULATION TESTING INSTRUMENTS
| κιν.
GENERAL DIRECTIONS FOR HAND-DRIVEN TYPES
|For Special Directions for the Various Types, see page 4.
For Motor-Driven Type, see page 5.
For Rectifier- and Dual-Operated Types, see pages 8
and 9.
“Major” and “Mark IV” instruments can be hand-cranked in
either direction.
‘CAUTION
See Safety Precautions, page 11.
Do not use a “Megger” Tester whose terminal or
operating voltage is in excess of that which is safe to
apply to the equipment to be tested.
1. Place the instrument on a firm and fairly level base. Avoid
large masses of iron and strong magnetic fields. The pointer
may appear to stand anywhere over the scale until the instru-
ment is operated, because the “Megger” Ohmmeter has no
control springs.
| 2. Selector Switch. If the instrument has a selector switch.
set it to MEGOHMS + 1.
| For further use of selector switch, see page 24.
| 8. Check Infinity by turning crank at normal speed in clock-
wise direction. (Normal speed is indicated on the instrument.)
| The pointer should move promptly to Infinity.
Important: This check is made with no connections to the
test terminals.
4. Check Zero by short-circuiting the testing terminals. Turn
the crank slowly. The pointer should move promptly to Zero
—or off the lower end of the scale in some instruments.
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