3M 701 Manual

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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 109 Ω).

B. A decade box with a range of 1OOKΩto 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 100KΩresistor across the input. Switch the unit to

CONTINUITY TEST. Verify that the unit reads within limits (± 2° of

100KΩmark 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 10GΩand 1 MΩin both the 10V and

100V SURFACE TEST modes. (Tolerances for the 1 MΩ/ 10 GΩ

readings are shown on the top scale of the meter as small dots on

either side of the respective resistance mark on the dial.)

E. Remove the decade box. Using the Keithley 619, verify that the output

is between 93V and 107V in the 100V SURFACE TEST mode.

F. If above specifications can not be obtained proceed to Section 4,

Calibration Procedures

4. CALIBRATION PROCEDURES

A. Place the batteries in the unit. Place the selector switch in the BATTERY

TEST position.

B. Press the TEST button, adjust R10 so that 10.00 V ± .01V appears

between U2 Pin 7 and ground. Release the TEST button.

C. Press the TEST button. Adjust R23 for 100.0V ± .1V between SW 1 Pin 12

and ground. Release the TEST button.

D. Place the selector switch in 100V SURFACE TEST position. Short the

input jacks. Press TEST button. Adjust R21 so that pointer reads full

scale. Release TEST button.

E. Return the selector switch to BATTERY TEST. Press the TEST button.

Adjust R36 so that the pointer lies over 100V mark on BATTERY TEST

scale. (For Issue 1 PC Boards, adjust the value of R8 to align the pointer,

as above. You will be able to find the issue number in the vicinity of the

TEST switch on the PC board.) Release the TEST button.

F. Place the unit in its case. Verify that the unit reads within the tolerance

limits for the following resistances in both the 10V and 100V SURFACE

TEST modes: 100KΩ, 1 MΩ, 10MΩ, 100MΩ, 1GΩ, 10GΩ. (Tolerances for

the 1 MΩ- 10GΩreadings are shown on the top scale of the meter as

small dots on either side of the resistance range. For the 100KΩrange,

estimate ±2° either side of the 100KΩmark on the upper scale of the

meter.)

G. Verify that the unit reads properly with a short and then a 100KΩ

resistance across the test leads in the CONTINUITY TEST mode. (NOTE:

for the 100KΩrange, estimate ±2° either side of the 100KΩmark on the

continuity scale of the meter.)

701 MEGOHMMETER VERIFICATION / CALIBRATION

Figure 1 Calibration Adjustments

(R36 is located on opposite edge of printed circuit board)

Figure 2. Main PC Board Assembly - Model T00456 3M 701 (Issue 1)

Figure 3. Main PC Board Assembly - Model T00456 3M 701 (Issue 2)

Figure 4. Main PC Board Assembly - Model T00456 3M 701 (Issue 3)

The accuracy of the 701 is based on two tolerances (+/- 5% electrical & +/-2 deg. of arc,

meter’s needle movement). The sum of these two tolerances are identified by two tiny

dots, one on each side of the major intervals (100 kilohms, 1megohm, 10 megohms, 100

megohms, 1gigaohm, and 10 gigaohms) marks located on the top scale. So to check the

701 for resistance measurement accuracy you need to test resistances at the major

intervals and confirm that the readings fall within the dots. Please be aware that we are

faxing the calibration procedure for the 701 Megohmmeter to you at the fax number

listed below.