3M CTM051 User Manual - Page 8

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Impedance Measurements

Depress the Ohms button to go into ground impedance

mode. You should see a screen similar to the one

shown on the right. The impedance mode is indicated

by "OH" on the bottom display line.

Scaling

The 3M

Ground Pro Ground Integrity Meter has

™

four different scales for measuring ground impedance. Choose the appropriate scale

for your measurements using the Up and Down arrow buttons.

O hm s

Auto-Zeroing Test Leads

Test leads offer added impedance and may alter

measurement results, especially at a lower scale. In

order to take impedance of test leads into account,

short the ends of the test leads together and depress the

Function button (F) until you see the screen shown on

the right. In a few seconds, this screen will disappear

and you will hear a short beep. The Ground Pro will

return to normal measurement mode. Now when the

test leads are shorted together, the display should show

zero Ohms, even though the test leads may have some

impedance. The correction factor will be saved in non-

volatile memory.

X.XXX Ohms

X.XX Ohms

Impedance Screen

XX.X Ohms

XXXOhms

O hms