GETTING STARTED 
21 
HIGH VOLTAGE 
output terminal 
The HIGH VOLTAGE 
terminal output is used for 
outputting the testing voltage 
in ACW, DCW and IR tests. 
The terminal is recessed for 
safety and used in conjunction 
with the RETURN terminal. 
USE EXTREME CAUTION. Do not touch the 
HIGH VOLTAGE terminal during testing.  
The HIGH VOLTAGE pilot lamp will 
light up red when an output terminal is 
active. Only after the test has finished 
or stopped will the lamp turn off. 
The RETURN terminal is 
used for ACW, DCW, IR and 
CONT tests. 
OUTPUT and 
RETURN 
terminals 
The OUTPUT terminal (red) 
and RETURN terminal 
(black) are used for CONT 
(Continuity) test. 
SENSE H/L and 
SOURCE H/L 
terminals 
GPT-12004,  
GPT-15004 only 
 
The SENSE H, SENSE L, 
SOURCE H and SOURCE L, 
terminals are used for GB 
(Ground Bond) test.