PeakTech 1125 Bedienungsanleitung Seite 29

Thermal Effects
Temperature can have a significant effect on the performance of
a Digital Milli-Ohmmeter, due to the temperature coefficient of
the resistance under test and thermal EMF´s across the
dissimilar conductors.
Most conductors have a large temperature coefficient of
resistance.
For example: 0,4% / °C for copper. A copper conductor, that has
a resistance of 10.00 mOhm at 20°C will increase to 10.40
mOhm at 30°C. This change should be taken into account, when
making measurements.
A current going through a resistance will also elevate its
temperature. So duration of the test can change the resistance.
When measuring the resistance of item, such as current shunts,
which have joints of dissimilar conductors, thermal EMF can
affect the accuracy of the measurement. This condition can be
detected if the reading altes, when the leads are reversed. To
compensate for this effect, the average of the two readings
should be taken as the true measurement.
Fuse Replacement
There are three fuses:
1. Power Supply Fuse
The power supply fuse is situated under the tester. Open the
battery compartment, and replace the fuse with the same type
(1.5A, >24V, Slow Blow)
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