9
Breakdown vs. burn mode
In breakdown mode insulation tests are automatically stopped
when a fault causes the applied voltage to drop rapidly. Burn
mode IR tests ignore breakdown and continue to test the
insulation and are therefore destructive tests. Burn mode is
used to purposely create a carbon track in insulation to
facilitate fault location. Burn mode only operates at test
voltages of 500 V and above.
Voltmeter
A voltmeter is incorporated in the
instrument and measures AC/DC
voltage from 30 V to 660 V. Frequency
(Hz) is measured and displayed for AC
voltages. Voltmeter mode is activated
by switching to ‘V’ mode as illustrated.
Positive and negative terminals are used for the voltmeter
function; do not connect the GUARD terminal when in
voltmeter (V) mode.
To assist user safety, the instrument will automatically switch
to voltmeter mode if a voltage of 50 V or more is connected to
the terminals. The measured voltage will be displayed
accompanied by an intermittent beeper to warn the user that a
dangerous voltage exists.
For further explanation see, “Running an Insulation Test” on
page 11.
Reset Default Settings
Remove AC source, press OK, backlight buttons and switch
main rotary switch from OFF to setting icon.
7
OFF
250V
500V
1kV
2.5kV
5kV
V
V
TΩ
