TOS7200
17
Connecting the Test leadwires
Connecting to the DUT
Connect the test leadwires to the DUT after connecting the low volt- age side and high
voltage side test leadwires to the tester.
1
Press the STOP switch.
2
Confirm that the DANGER lamp is off.
3
Short-circuit the high voltage side test leadwire using the low voltage side
test leadwire to confirm that no high voltage is applied.
4
Connect the low voltage side test leadwire to the DUT.
5
Connect the high voltage side test leadwire to the DUT.
Connecting to a grounded DUT
When conducting an insulation resistance test on a DUT with one terminal grounded, connect
the LOW terminal of the tester to the grounding terminal of the DUT.
For example, to conduct an insulation resistance test across the AC LINE and grounding
terminal of the grounded DUT, connect the LOW terminal of the tester to the grounding
terminal of the DUT and the HIGH terminal of the tester to the AC LINE of the DUT.
WARNING
Risk of electric shock. Never touch a test leadwire, the DUT, the HIGH terminal, or the
LOW terminal during a test (or while the DANGER lamp is lit).
The polarity of the output terminal of the tester is negative. The HIGH terminal has negative (-)
polarity, while the LOW terminal has positive (+) polarity.
MEMORY
VOLTAGE
RESISTANCE
TIMER
MEMORY
VOLTAGE
RESISTANCE
TIMER
OUTPUT
AC LINE
L
N
Grounded DUT
TOS7200
Insulation resistance test across
the AC LINE and chassis of the DUT
WARNING
Risk of electric shock. Never touch a test leadwire, the DUT, the HIGH terminal, or the
LOW terminal during a test (or while the DANGER lamp is lit).
