Example 3 in the Appnote entitled "Measuring a PRT or thermostor without a completion resistor" uses a sequence of commands to measure first current, then voltage, and from there calculate resistance and temperature. This requires maintaining an excitation voltage through two measurements.
The program help for ExciteV states:
"If the Delay is set to 0, the excitation channel will be enabled and the voltage will be held until the end of the program scan, until another instruction sets an excitation voltage, or until the instruction is interrupted by a measurement. When the measurement is finished the excitation channel is returned to the value that was set prior to the measurement."
How can the resistance be measured of the excitation voltagfe is not maintained?
A supplementary question would be, what is the use case for an excitation that is not maintained during measurements?
This post is under review.
This post is under review.
The use case for an excitation that is not maintained during measurements could be for applications where a brief excitation is sufficient, or where continuous excitation might lead to self-heating of the sensor, potentially affecting the accuracy of the measurement. In such cases, the excitation getting over it is applied just long enough to make the measurement and then turned off to prevent any influence on the sensor's temperature.