3M 701 Calibration Procedure

Browse online or download pdf Calibration Procedure for Measuring Instruments 3M 701. 3M 701 7 pages. Megohmmeter
Also for 3M 701: Operator's Manual (8 pages), Operator's Manual (9 pages)

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CALIBRATION AND VERIFICATION TEST PROCEDURE

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

Ω).

x 10

B. A decade box with a range of 1OOKΩ to 10GΩ ±1 % or the following

individual resistors:

100KΩ ±1%

1MΩ ±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

FOR 3M 701 MEGOHMMETER