The EXT jack is used for accept insulation tester unit EXT banana plugs, whenmeasurement insulation resistance.
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3.2 Insulation test(Option 500V insulation tester unit (not available in France and Benelux market))
1. Connect the insulation test unit V β¦, COM, EXT three bananaplugs to theclamp meter V β¦, COM, EXT.
2. Set the rotary switch of the clamp meter at 2000M⦠position.
3. Set the insulation tester unit range switch to the 2000M⦠position.
4. Use the insulation tester unit of the test leads connect its L, E input connectto being tested installation’s. ( Test installation’s must be power OFF.)
5. Set the insulation tester power switch to the ON position.
6. Depress the PUSH 500V push-push switch, the 500V on red LED lamp willlight. Clamp meter display reading is the insulation resistance value. If thereading is below 19Mβ¦, change clamp meter and insulation tester unit to20Mβ¦ range, can be increase the accuracy.
7. If the insulation tester unit is not used, the power switch must shift to powerOFF position, and the test leads must leave the E, L input connect. That canbe increase battery life and prevent electrical shock hazard.