Fluke 1535 User Manual page 22

PI/DAR is valid in these conditions:
• Capacitance is ≤0.1 μF or Resistance is ≤100 MΩ.
• Resistance is ≥200 kΩ and Capacitance ≤2 μF.
• Current is ≥50 nA.
To do an insulation test:
1. With the Tester turned on, set the available measurement options to meet
your test requirements. These include:
Test Voltage – Set range: 250 V to 2500 V (1537 only: 100 V steps)

Ramp Test – (optional, 1537 only)

Time Limit – (optional, 1537 only)

2. Connect the probes to the circuit under test.
To prevent possible electric shock or personal injury:
Before and after tests, do a voltage test to confirm that the Tester

does not detect the presence of hazardous voltage. See
If the Tester beeps continuously before the insulation test starts

and there is hazardous voltage, disconnect test leads and remove
power from the circuit under test.
D
3. Push for 1 second to start the insulation test.
The Tester makes three beeps as the test begins, and X flashes on the
display to indicate potentially hazardous voltages may be present on the
test terminals.
The display shows the insulation resistance after the circuit stabilizes. The
bar graph shows this value continuously (in real time) as a trend. See
Table 6.
XW Warning
Insulation Tester
Insulation Test
Table 4.
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