Fluke 1587 FE 1587-1577 Users Manual - Page 34

1587/1577 Users Manual Testing Insulation Insulation tests should only be performed on dead circuits. Check the fuse before testing. See Testing the Fuse later in this manual. To measure insulation resistance set up the Meter as shown in Figure 13 and follow the steps below: 1. Insert test probes in the p and q input terminals. 2. Turn the knob to INSULATION position. A battery load check is initiated when the switch is moved to this position. If the battery fails the test b and bat appear in the lower display. Insulation tests cannot be performed until the batteries are replaced. 3. Press r to select the voltage. 4. Connect the probes to the circuit to be measured. The Meter 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 Meter and remove power before proceeding. 5. 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 Meter displays the Q symbol and the maximum resistance for the range. 6. Keep the probes on the test points and release the t button. The circuit under test then discharges through the Meter. 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. 24