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Fluke 1520
Users Manual
6
Key functions
Table 1. Key and Switch Descriptions
Rotary switch
To select a measurement function.
Used for the Insulation Resistance and Low Resistance test functions.
Press and hold this button until the main reading is stable.
Locks the test in Insulation Resistance or Low Resistance function.
To lock: press and hold TEST, then press LOCK and simultaneously release
both buttons. The icon
V LOCK appears on the display.
• Insulation Resistance- this mode continuously applies the test voltage
to the circuit to be tested. The beeper sounds every 2 seconds to
remind you that you are in the Lock mode.
• Low Resistance- this mode continuously applies the test current to the
circuit to be tested.
To unlock: press LOCK or TEST again.