4.2 Starting a Test
57
4
Carry out the test after finishing setting the test conditions (p. 49).
For safety reasons, key lock is recommended. All keys except the START key
and STOP key are disabled while the key-lock function is active.(p. 79)
4.2 Starting a Test
To prevent electric shock, check the following before starting test.
Front panel
•The DANGER lamp is
OFF.
• The lamp is lit
(it is off in the Double
Action mode).
After measuring the insulation-resistance for a tested object which has
some capacity properties, the capacitor of the tested object may become
charged. The instrument will make use of the electrical discharge function
to show a DANGER warning signal until the safety voltage is reached, but
if the electricity is not discharged properly, it may cause electrical shocks
or damages to other instruments.
• If a capacity load is applied to the tested object, the output voltage may exceed
the preset voltage, thereby damaging the equipment.
• Continuous output of a high voltage may heat the bottom of the instrument. To
prevent from getting scalded, do not touch the bottom.
• There is a priority hierarchy for the START keys.
Priority hierarchy: Remote Control Box > EXT I/O > Front panel of the 3174
(3174-01)
Note that when a START key with a higher priority is in use, lower-priority
keys are disabled.
• When measuring the insulation-resistance for a tested object which has some
capacity properties, the output voltage may dip because some current is used
to charge the capacitor, resulting in inaccurate measurement of the insulation-
resistance value. Carry out the test (PASS, FAIL) only when the output voltage
is stable and the delay time has been set.
To Next Page
Loading...
