Fluke 1507 [21/38] Measuring insulation resistance

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Insulation Testers

Making Measurements

Measuring Insulation Resistance

Insulation tests should only be performed on de-energized

circuits. To measure insulation resistance set up the

Tester as shown in Figure 7 and follow the steps below:

1. Insert test probes in the

V and COM input terminals.

2. Turn the rotary switch to the desired test voltage.

3. Connect the probes to the circuit to be measured. The

Tester automatically detects if the circuit is energized.

• The primary display shows - - - - until you press

T and a valid insulation resistance reading

is obtained.

• The high voltage symbol (Z) along with a primary

display of >30 V warns if voltage more than 30 V

ac or dc is present. In this condition, the test is

inhibited. Disconnect the Tester and remove

power before proceeding.

4. Push and hold T to start the test. The secondary

display shows the test voltage applied to the circuit

under test. The high voltage symbol (Z) along with a

primary display showing the resistance in MΩ or GΩ

appears. The

t icon appears on the lower portion of

the display until T is released.

When resistance is higher than the maximum display

range, the Tester displays the Q symbol and the

maximum resistance for the range.

5. Keep the probes on the test points and release the

T button. The circuit under test then discharges

through the Tester. The resistance reading appears

on the primary display until a new test is started or a

different function or range is selected or > 30 V is

detected.