AEMC 1000N - Operation; The Analog Scale

Megohmmeter Model 1000N/1100N
- 11 -
23(5$7,21
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Before taking any measurements, verify that the pointer is zeroed
correctly (AC scale "0"). If it is not, adjust with the mechanical zero
adjust screw.
The analog scale serves two functions. First, it indicates the actual
resistance of the insulating material under test (black scales). The top
scale is used for measurement on the M
Ω
and G
Ω
ranges. The bottom
half (M
Ω
) covers the range of 1M
Ω
to 1000M
Ω
, reading from left to right
The upper portion of the scale (G
Ω
) covers the range of 1G
Ω
to 1000G
Ω
and reads left to right.
The center scale is used for the low insulation test range of 1k
Ω
to
1000k
Ω
, reading from right to left.
The bottom arc is an AC/DC voltmeter which is divided into 10-volt
increments. The voltmeter function is operable any time the PUSH-TO-
TEST button is out. The voltmeter detects the presence of voltage on the
equipment to be tested.
(If voltage is detected, do not proceed with
the insulation test.)
The voltmeter function also indicates if, after completing insulation
testing, the sample under test has stored a dangerous capacitive charge.
The instrument discharges this capacitance internally and the needle will
drop accordingly. Disconnect the meter when the sample is discharged.
Warning:
Electrical equipment and cables may have sufficient capacitance to store
a dangerous charge from the instrument test current. For proper
discharge to occur the PUSH-TO-TEST button must be in the OFF
position with the sample connected between the EARTH and LINE
terminals.
On prolonged tests, the PUSH-TO-TEST button may be locked in the ON
position; care should be taken in this mode that no damage is done if the
instrument is left unattended.