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4.5 MEASURING MILLIVOLTS
If the instrument was most recently used for mV measurement, it will be ready to use
once the power is turned on. If it was not recently used for mV measurement:
Check that the MEASUREMENT/CALIBRATION switch is in the MEASUREMENT
position.
Select the mV input by pressing the TC&mV key.
Check that the measured value is shown in millivolts ( an arrow at the right edge of the
display will point to mV). If mV is not being shown, press the TC/mV key once.
The CL521 will now measure millivolts. Reference junction compensation is
automatically disconnected (the CJ MODE arrow indicates MAN and Register 9 is
set to 0°C).
If the potential being measured goes below -10 mV or above 110 mV, the display will
blink the minimum or maximum measurement values to indicate range underflow or
overflow.
SECTION 5 Pt100 RESISTANCE MEASUREMENTS
5.1 GENERAL INFORMATION
Resistance probes are often used for temperature measurement. Currently the most
cornmon probe type is the Pti 00 resistance probe. It is constructed from platinum wire
having a resistance of 100 ohms at OX. The resistance increases with temperature,
because metal wires have a positive thermal coefficient of resistance.
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