1587 FC/1587/1577
Users Manual
24
Insulation
Insulation tests should only be performed on dead circuits.
Check the fuse before testing. See Fuse Test later in this
manual. To measure insulation resistance, set up the Meter
as shown in Figure 9 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
s 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 s 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 s 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
s button. The circuit under test then discharges
through the Meter. The resistance reading remains on
the primary display until a new test is started, a
different function/range is selected, or >30 V is
detected.
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