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Chapter 6
6.3.10
RTD Lead Resistance Calibration (Offset Null)
Because the RTD sensor reflects changes in temperature with small changes in
resistance, even a small lead resistance (resistance caused by the wire running
between the TEC module and the RTD sensor) can cause significant temperature
offset. The lead resistance may be taken out of the RTD reading as follows:
6.3.11
Local Operation I
The following procedure is for calibrating the I
polarities of current.
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Calibration
The 8000 will be ready to receive the resistance when, after a
TEC:CAL:SEN? query is sent, a "1" is returned.
c.
Input the actual resistance, in ohms, of the metal film resistor (as an
<nrf value>) via the TEC:R <nrf value> command.
If, at any time prior to TEC:R, a command other than TEC:R or
TEC:R? is sent to the 8000, the 8000 will cancel the calibration mode
and then process the command(s).
Once the TEC:R value is sent, the OPC? query may be used to
determine when the calibration is completed. The operation complete
flag (bit 0 of the Standard Event Status Register) may be used to trigger
an interrupt. This type of interrupt is enabled by setting bit 0 of the
Service Request Enable register and using the *OPC command.
a.
With the TEC output off, short the sensor wires as close to the RTD
sensor as possible.
b.
Go to the single module display by first pressing the MENU button,
then the Modules soft key, then the slot soft key that corresponds to the
module to be calibrated.
c.
Go to the Calibration Screen. This is done by pressing the Menu
button, Config soft key, Calibrate soft key; then the soft key(s) that
correspond to the module to be calibrated.
c.
Enter the TEC sensor calibration mode by pushing pressing the RTD
Null soft key. Follow the on-screen instructions to complete the
calibration. The calibration can be canceled without affecting the stored
constants if the Cancel soft key is pressed at any point prior to
completing the calibration.
Current Calibration
TE
constant current source for both
TE
83
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