Newport 8000 - RTD Lead Resistance Calibration (Offset Null); Local Operation ITE Current Calibration

Chapter 6 Calibration 83
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.
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:
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.
6.3.11 Local Operation I
TE
Current Calibration
The following procedure is for calibrating the I
TE
constant current source for both
polarities of current.
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