28
Performing Insulation Resistance Testing
You will need:
IR4059 Insulation Tester and L9788-11 Test Lead Set with Remote Switch
(recommended)
1
Following the instructions in “Preparing to Repair or Inspect
the Vehicle (Disconnecting the Vehicle’s High-voltage Bus)”
(p. 13).
2
Following the instructions in “Verifying That There Is No
Voltage” (p. 18).
3
Connect the test leads to the IR4059.
4
Select the OFF position with the IR4059’s MEASURE key.
5
Select a voltage range that is higher than the traction
battery’s voltage with the instrument’s rotary switch.
If the vehicle manufacturer species a voltage range, select that
range. Please refer to the vehicle manufacturer’s service manual.
(If using the 500 V range or 1000 V range, press the RELEASE
key to disengage the lock.)
6
Connect the test leads to each measurement location.
Please refer to the table for a list of example test locations.
(p. 27)
(Since the inverter side of the bus includes diodes, swap the
red and black test leads when performing this test.)
7
Press the MEASURE key.
8
Once the display stabilizes, check the value.
9
Select the OFF position with the MEASURE key while leaving
the test leads connected to the measurement locations.
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