CALIBRATION AND VERIFICATION TEST PROCEDURE
FOR 3M 701 MEGOHMMETER
1. INTRODUCTION
This Specification defines the suggested method of calibration and
performance verification for the 3M 701 Megohmmeter. It also defines the
test equipment to be used.
2. TEST EQUIPMENT and DOCUMENTATION
A. A Keithley Model 619 Electrometer or equivalent (input impedance ≥ 1
x 10
9
Ω).
B. A decade box with a range of 1OOKΩ to 10GΩ ±1 % or the following
individual resistors:
100KΩ ±1%
1MΩ ±1%
100MΩ ±1%
100MΩ ±1%
1GΩ ±1%
10GΩ ±1%
C. Figure 1 - Calibration adjustments
Figure 2 - Main PC Board Assembly issue 1
Figure 3 - Main PC Board Assembly - issue 2
Figure 4 - Main PC Board Assembly - issue 3
3. VERIFICATION PROCEDURE
A. Place selector switch in the OFF position and adjust the mechanical
zero to the left end of the scale.
B. Place selector switch in the BATTERY TEST mode. Verify that pointer
is in the green (100V) area on the BATTERY TEST scale.
C. Place the 100KΩ resistor across the input. Switch the unit to
CONTINUITY TEST. Verify that the unit reads within limits (± 2° of
100KΩ mark on the CONTINUITY TEST scale. Short the input; verify
that the unit has full-scale deflection.
D. Remove the short; place the decade box across the input. Verify that
the unit reads within limits for 10GΩ and 1 MΩ in both the 10V and
100V SURFACE TEST modes. (Tolerances for the 1 MΩ / 10 GΩ
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