Insulation Resistance Measurement - Greenlee 5990A Instruction Manual

Measurements (cont'd)

Insulation Resistance measurement

Select this function by pressing the Ω button. It will display the following states (Initial Display
and Display with results). See Fig. 12 below.
Initial display
Legend of displayed symbols in Fig 12:
Insulation Resistance
250V
253 V
102 MΩ
Bar
Measurement procedure:
• Connect the test leads to the instrument and to the test object.
• Select INSULATION RESISTANCE mode by pressing the Ω button.
• Press the START/STOP button and release it. This will begin continuous measurement.
• Wait until the test result has stabilized then press the START/STOP button again to stop
the measurement.
• Wait to remove the object under test until it is discharged.
Notes:
• A high-voltage warning symbol appears on the display during the measurement to warn the
operator of a potentially dangerous test voltage.
16
Fig. 12 Insulation Resistance Function Display States
Name of selected function
Selected test voltage
Actual test voltage (measured value)
Insulation Resistance – result
Analog presentation of result
Display with results