14
12.Capacitance measurement
l
Verify that the device under test is electrically dead. External voltages
would falsify the measured results!
l
Set the function selector switch (6) to "F”
l
Connect the (discharged !) device under test to the "
^
sockets
via test lead.
" and “ F ’’
The zero adjustment can be cleared
l
By pressing the yellow multi-function pushbutton (5) for a long time,
clearance is acknowledged by the two sound signal.
l
By switching the multimeter off.
l
Connect the test leads to the meter without device under test.
l
Briefly press the yellow multi-function pushbutton (5).
The meter acknowledges zero adjustment by a sound signal, by
displaying "00.00" (+1digit) on the LCD and by a flashing decimal point.
The capacitance measured at the instant the pushbutton is pressed is
used as reference value (max.200 digits). It is automatically deducted
from the values measured thereafter.
Note:
^
" socket.
Connect polarised capacitors with the " __ " pole to the "
Resistors and semiconductor junctions in parallel with the capacitor falsify the
measured results!
Zero adjustment on the 30 nF measuring range
When measuring small capacitance values on the 30 nF range, the internal
resistance of the multimeter and the capacitance of the leads can be
eliminated by zero adjustment.
17
16. Insulation resistance measurement
16.1 Before measurement.
E
CAUTION !!!
Insulation resistance of only ‘voltage free objects’ can be measured.
Do not touch measuring probes.
†
Select the V1M
Ω
Ω
Ω
Ω
function using rotary switch
†
Connect the measuring probes to “
^
This function provides way to measure interference voltage. It also
provides discharge path of 1M to charge present on measuring
objects.
†
†
” and V1M ” input terminals.
Turn the rotary switch to “M
is
voltage free.
INSU” when device under measurement
This position by default reads interference voltage. If this voltage is
>50V, insulation resistance measurement is disabled.
16.2 Selecting Test Voltage: 50V or 100V or 250V or 500V or
1000V.
†
If VINSU key is briefly activated, currently selected test voltage is
displayed.
†
Default values is 500 V. To select other value press and hold VINSU key
until other voltage is displayed. This is confirmed with a sound beep
signal.
16.3 Insulation resistance measurement:
†
Press and hold multifunction (yellow) key until display has stabilized.
Insulation measurement is stopped when multifunction key is released.
†
An insulation resistance of less than 1M with a test voltage of 500 V, or
less than 2M with a test voltage of 1000 V is indicated with an acoustic
signal.
†
Automatic measuring range selection is active for insulation resistance
measurement. There is no provision for the manual selection of
measuring range.
Ω
Ω
Continuous Measurement
†
Activation: Press and hold multifunction (yellow) key and simultaneously
press AUTO/MAN key until a sound beep is heard.
E
NOTE !!!
The instrument batteries are rapidly depleted during insulation resistance
measurement. Only press and hold the multifunction key as long as is
necessary to take the reading. Continuous measurement as described
below should only be performed if absolutely necessary. Use only Alkaline
manganese batteries in accordance with IEC6 LR03.
High Voltage
Do not touch the conductive ends of the test probes after insulation
measurement has been activated at the instrument. A current with a
value of 2.5 mA (limited by instrument ) may flow over your body, and
although this is not life threatening, the electric shock is distinctly
perceptible. If you are taking measurement at capacitive DUT, for
example a cable, it may be charged with as much as 1000 V,
depending upon the selected nominal voltage. Touching the DUT may
be life threatening.
~
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