Testing Insulation - Fluke 1577 User Manual

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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
2. Turn the knob to
INSULATION
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.
Press r to select the voltage.
3.
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.
24
p q
and input terminals.
position. A battery load
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.
Push and hold t to start the test. The
5.
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 M or G appears. 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.
T
icon appears on the