Seaward IRT 1557 - Manual (Page 12)

IRT1557
Operating Instructions
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5 Using the IRT 1557
5.1 Power On
To turn the IRT 1557 on simply rotate the rotary switch
to the required test type.
5.2 Battery Health Check
The battery condition should be checked before any
test using the battery test function..
Note: When the battery test function displays 0%,
the batteries should be replaced as described
in section 8.3.
5.3 Measuring Insulation Resistance
Always ensure that the circuit under test is
isolated before attempting to make an insulation
measurement.
5.3.1 Rotate the rotary switch until the required test
voltage is selected.
5.3.2 Connect the test probes to the circuit to be
measured.
If a voltage greater than 30V is present at the
test probes the buzzer will sound, the warning
icon is displayed and the measured voltage is
displayed. Insulation measurement is inhibited
until the voltage is removed.
5.3.3 Press and hold the TEST button. The secondary
display shows the actual test voltage applied to
the circuit under test. The primary display shows
the measured resistance. The measured
resistance may fluctuate due to capacitance on
the circuit under test. The IRT 1557 will emit a
beep to indicate a stable reading has been
obtained.
5.3.4 Release the TEST button but keep the test
probes connected to allow the IRT 1557 to