Newport 8000 - Remote Operation ITE Current Readback Calibration, Dual and Combo TEC Modules85

Chapter 6 Calibration 85
The module will be placed in I
TE
mode, limit set to 50% of full scale
plus 100 mA, and the I
TE
set point set to 50% of full scale.
The 8000 will be ready to receive the first measured current value
when, after a
TEC:CAL:ITE?
query is sent, a “1” is returned.
c. Input the actual current (as an <nrf value>) via the
TEC:ITE <nrf
value>
command. The 8000 will then drive the current to 25% of the
initial set point.
The 8000 will be ready to receive the second measured current value
when, after a
TEC:CAL:ITE?
query is sent, a “1” is returned.
d. Input the second actual current (as an <nrf value>) via the
TEC:ITE
<nrf value>
command. The 8000 will then drive the current to the
negative current value of the initial set point.
The 8000 will be ready to receive the third measured current value
when, after a
TEC:CAL:ITE?
query is sent, a “1” is returned.
e. Input the third actual current (as an <nrf value>) via the
TEC:ITE <nrf
value>
command. The 8000 will then drive the current to 25% of the
negative current value of the initial set point.
The 8000 will be ready to receive the fourth measured current value
when, after a
TEC:CAL:ITE?
query is sent, a “1” is returned.
f. Input the fourth actual current (as an <nrf value>) via the
TEC:ITE
<nrf value>
command.
If, at any time prior to the last
TEC:ITE,
a command other than
TEC:ITE
or
TEC:ITE?
is sent to the 8000, the 8000 will cancel the
calibration mode and then process the command(s).
Once the
TEC:ITE
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.
6.3.13 Remote Operation I
TE
Current Readback Calibration, Dual
and Combo TEC Modules
Because the dual and combo modules only support constant temperature mode,
calibration of the I
TE
readback is done using the limit circuit. By loading a 10 kΩ
resister across the sensor input and selecting the Thermistor sensor, the system will
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