PeakTech 1640 Bedienerhandbuch Seite 37

3. Press trigger to open the transformer jaws and clamp them
around the conductor. The Jaws should be completely
closed before taking a reading.
4. The reading will be indicated in the display.
5. The most accurate reading will be obtained by keeping the
conductor across centre of the transformer jaws.
6.4. Resistance measurements
WARNING! Attempting resistance or continuity measurements
on live circuits can cause electric shock, damage to the
instrument and damage to the equipment under test. Resistance
measurements must be made on de-energized (DEAD) circuits
only for maximum personal safety. The electronic overload
protection installed in this instrument will reduce the possibility of
damage to the instrument bus not necessarily avoid all damage
or shock hazard.
1. Turn off any power to the resistor to be measured.
Discharge capacitors. Any voltage present during a
resistance measurement will cause inaccurate readings and
could damage the meter if exceeding the overload protection
of 250 V DC or AC.
2. Insert the black and red test leads into the COM and V/Ω
input terminals respectively.
3. Select the desired ohm (Ω) range.
4. Connect the black and red test probe tips to the circuit or
device under test, making sure it is de-energized first.
5. Open circuits will be displayed as an overload condition.
6. Test lead resistance can interfere when measuring low
resistance readings and should be subtracted from
resistance measurements for accuracy. Select lowest
resistance range and make the test leads short together.
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