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Resistance measurements can tie used, for example, to determine temperature using
resistance probes other than the Pt100. In applications not requiring high accuracy, it is
often more convenient to use the two-wire TC Q measurement mode.
SECTION 6 ADDITIONAL MEASUREMENT FUNCTIONS
6.1 USING OTHER MEASUREMENT FUNCTIONS
The additional measurement functions may be used whenever the MEASUREMENT/
CALIBRATION switch is in the MEASUREMENT position.
Additional measurement
Figure 6-1. Additional Functions with the CL521
To return to the normal measurement mode from another measurement function, press
the NORM key.
6.2 MONITORING RATE OF CHANGE
The rate of measurement change is normally calculated from the change occurring
during a period of 12 seconds. If the change is very small, however, the period is
automatically stretched up to two minutes to get better resolution. The change in rate
display is obtained by pressing the RATE key. The function is indicated by the letter "r"
at the left side of the display.
The value is shown in °C/min, °F/min, mV/min, or ohm/min. This function is intended for
use mainly to facilitate monitoring of temperature stabilization in a calibration oven.
6.3 MEASUREMENT OF DEVIATION
Pressing the DIFF key causes the deviation from the value stored in Register 8 to be
shown on the display. This function is indicated by the letter "d" at the left side of the
display. Deviation measurements can be used, for example, to investigate the behavior
of temperature controllers (thermostats).
The deviation function comparison value is zeroed whenever the CL521 is switched on.
To check or set this value, proceed as follows.
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