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CALIBRATION
TEC Calibration Procedures
16 TCM-39032
CHAPTER 3
Remote Operation RTD Sensor Calibration (with TSC-595 Option)
The following procedure is for calibrating the RTD sensor so that the measured
temperature will be as accurate as possible. This procedure is for remote
operation.
1 Set the SENSOR SELECT switch (back panel) to the RTD position.
2 Measure and record the exact resistance of a 120 Ω (metal film) resistor. (A 4-point probe
resistance measurement is recommended.) Connect the 120 Ω (metal film) resistor to the
sensor input of the TCM-39032 (pins 7 and 8).
3 Enter the “TEC:CHAN x” command over the GPIB to select the channel of the TCM-
39032 to be calibrated, where x = the channel number.
Enter the “TEC:CAL:SENsor” command over the GPIB. The TEC display will show the
voltage in mV. The LDC-3900 will beep when it is ready to accept a new calibration value.
4 Input the actual resistance in (kΩ) measured by the external DMM (as an <nrf value>) via
the “TEC:R <nrf value>” command.
If this value is to be measured and entered remotely via a GPIB controlled DMM, for
example, the measured value of the current should not be entered until the LDC-3900 is
ready to receive it. The LDC-3900 will be ready to receive the actual resistance value
when, after a “TEC:CAL:SENsor?” query is sent, the response from the LDC-3900 is “1”.
Remove the 120Ω resistor from the LDC-3900. Measure and record the resistance of a
precision 80Ω (metal film) resistor. Connect the precision 100Ω (metal film) resistor at the
sensor input of the TCM-39032 (pins 7 and 8).
Input the actual resistance for the second resistor (in kΩ) measured by the external DMM
(as an <nrf value>) via the “TEC:R <nrf value>” command.
5 Once the second “TEC:R” value is sent, the LDC-3900 will beep and return to its former
state (before calibration). The “OPC?” query may be used (after the “TEC:R” value is
sent) to determine when the calibration is completed.
The operation complete flag (bit 0 of the Standard Event Status Register) may be used to
trigger a service request. This type of interrupt is enabled by setting bit 0 of the Service
Request Enable Register (via the *ESE command) and bit 5 of the Service Request
Enable Register (via the *SRE command). Service request (SRQ) handling depending on
the GPIB hardware. Refer to the GPIB manual for details.