TECPak
User’s Manual · Page 31
First, to calculate the actual sensor resistance, you need to take the voltage
output and
multiply it by two.
This is because the output voltage goes through a
divide-by-two circuit before being output, and you need to double it to return it to
the actual voltage. Then, the resistance of the sensor is calculated as follows:
R
SENSOR
= Analog Mon Out * 2 / BiasCurrent
The bias current is either 10uA or 100uA for thermistors, or 1mA for RTDs.
Once the resistance is known, then the temperature can be calculated using the
appropriate equation discussed in the thermistor and RTD sections above.
If you wish to make a highly accurate measurement, then you will need to
calibrate the voltage reading from the instrument. You can do this using two
known fixed resistor values, measuring the Analog Monitor Output for each
resistor and calculating the calibration coefficients for a simple linear equation to
correct for any measurement error. Contact the factory for a self-guided Excel
worksheet that will capture the values and perform the calculations for you.
Summary of Contents for TECPak 585 Series
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