Operation - Extech Instruments GRT300 User Manual

Operation

Battery Voltage check
1. Press the "ON/OFF" button, if "Battery Low" appears on the display, replace the batteries.
Earth Voltage measurement
1. Connect the test leads as shown below.
E
C
1
(1) Earth electrode (rod) under test (2) Test spike
2. Press the "ON/OFF" button and wait for "Select Function" to appear on the display.
3. Press the "ACV" button and then the "TEST/STOP" button.
4. The earth voltage will be displayed on the display.
Note: When the earth voltage is more than 10V, errors in earth resistance measurements may
occur. Make sure that the indicated value is less than 10V.
ES
MAX.
AC 300V
P
1
1
S H
P
C
2
2
2
4 GRT300-EU-EN v1.1 08/13