Fluke 1520 FE 1520 Users Manual - Page 20
Using the LOCK Function to Measure Insulation Resistance, Press the TEST button
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MegOhmMeter Using the Meter Using the LOCK Function to Measure Insulation Resistance The LOCK function holds the test voltage on the probes. Use LOCK to make long duration measurements without having to push and hold the TEST button. To use the LOCK function: 1. Press the TEST button, then press the LOCK button, and then release both simultaneously. W Warning In this mode a potentially dangerous voltage is continuously applied to the probes. In this mode, if the probes are disconnected from the circuit, the Meter cannot discharge any potentially dangerous capacitive voltages left on the circuit. Caution In this mode the Meter cannot indicate if the circuit is live. Ensure that the circuit is de-energized before connecting the test probes in this mode. 2. Press LOCK or TEST to disengage the lock function. 15