GOSSEN-METRAWATT
13
Attention!
!
Do not touch the probe ends (9) and (10) when the tester
is switched on for ISO-
Ω
measurement.
When the
probe ends are free or connected to an ohmic
device under test, a current of up to 1 mA would
flow through your body at a voltage of 250 V,
500 V or 1000 V. The electrical shock is noticea-
bly felt but the current does not reach hazardous
values.
If, however, you measure on a
capacitive device
under test
, e.g. on a cable, this can charge up to
about 250 V, 500 V or 1 000 V, depending upon
the nominal voltage selected.
Touching means dan-
ger to life
! For that reason, discharge with caution
as described before.
Holding the measured value
When the measured value is steady, „DATA“ is displayed on
the LCD display (5). A brief sound signals this state.
í
You can read the measured value now – or after releas-
ing the measurement pushbutton (8).
í
Now release the measurement pushbutton (8) in the
probe.
The word „HOLD“ is displayed in addition to „DATA“, and
the measured value on the digital display is held.
If you release the pushbutton even though the measured
value is not (yet) steady, „HOLD“ is displayed instead of
„DATA“. When releasing the pushbutton, the measured
value shown on the digital display is held.
í
Continue to contact the measuring points with the two
probes.
After releasing the measurement pushbutton, the voltage
scale is again shown on the analog indicator. After having
measured the insulation resistance of a capacitive device
under test, the latter discharges automatically. You can
observe the drop in voltage on the pointer of the analog
indicator.
Remove the connection to the device under test only when the
warning triangle „V“ is no longer shown!
It is only then that
the voltage across the device under test is no longer haz-
ardous.
í
The measured value hold in the digital display is cleared
approximately 3 minutes after releasing the measure-
ment pushbutton (8) and the tester switches to
„standby“.
í
The lamp in the probe (9) is a helpful means to read the
LCD at poor light conditions. The lamp lights as long as
you keep the pushbutton „AUTO /
⊗
“ (2) pressed.
Repeating the measurement
í
Press the measurement pushbutton (8) in the probe and
hold it at this position. New measured values are immedi-
ately shown. The previously held value is cleared.