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CALIBRATION
TEC Calibration Procedures
06_03 TCM-39032 15
CHAPTER 3
Local Operation RTD Sensor Calibration (with TSC-595 Option)
The following procedure is for calibrating the RTD sensor so that the temperature
measurement will be as accurate as possible. This is a two-point calibration
procedure. This procedure is for local (front panel) operation. The next section will
cover remote calibration.
1 Set the SENSOR SELECT switch (back panel) to the RTD position (position --05). Select
the TCM-39032 for calibration by pressing the appropriate (ADJUST) LAS / TEC switch
(so that the TEC indicator is orange).
2 Measure and record the resistance of a precision 120Ω (metal film) resistor. Connect the
resistor at the sensor input of the TCM-39032 (pins 7 and 8).
3 Enter the TEC sensor calibration mode by pushing the (GPIB) LOCAL and (TEC
DISPLAY) R switches at the same time. The sensor code (SENSOR SELECT switch
position) value will be displayed for 2 seconds. After this, the TEC display will indicate
sensor reference resistance in KΩ. The LDC-3900 will beep when it is ready to accept a
new calibration value.
4 Press and hold in the (PARAMETER) SET switch and turn the ADJUST knob until the
TEC display indicates the same resistance as shown in Step 2.
5 Release the (PARAMETER) SET switch to store the first calibration value. After the SET
switch is release, the LDC-3900 will beep and be ready for the next calibration value.
Remove the 120 Ω resistor from the LDC-3900. Measure and record the resistance of a
precision 80 Ω (metal film) resistor. Connect the precision 100 Ω (metal film resistor at the
sensor input of the TCM-39032 (pins 7 and 8).
6 Press and hold in the (PARAMETER) SET switch and turn the ADJUST knob until the
TEC display indicates the same resistance as recorded in Step 3.
7 Release the (PARAMETER) SET switch to store the new value into non-volatile memory
on the TCM-39032. After the SET switch is released, the LDC-3900 will beep and return
to its former state (before calibration).