Seaward IRT 1557 - Manual (Page 13)

IRT1557
Operating Instructions
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discharge any capacitance on the circuit under
test.
5.3.5 The primary display indicates the decreasing
voltage. Keep the probes connected until the
circuit is completely discharged (primary display
shows - - - -).
5.4 Measuring continuity
Always ensure that the circuit under test is
isolated before attempting to make a continuity
measurement.
Measurements can be adversely affected by
impedances of additional operating circuits
connected in parallel or by transient currents.
5.4.1 Rotate the rotary switch until the continuity test is
selected.
5.4.2 The resistance of the test leads can introduce
significant errors when measuring low resistance
values.
5.4.3 To null the test lead resistance, connect the
probes tips together. Press and hold the zero key
until the meter beeps. The primary display will
indicate 0.00 and the zero icon will be displayed.
5.4.4 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. Continuity measurement is inhibited
until the voltage is removed.