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CALIBRATION
TEC Calibration Procedures
12 TCM-39032
CHAPTER 3
the GPIB hardware. Refer to the GPIB manual for details.
7 Switch the THERM RANGE switch (back panel) to the 10 µA position and repeat this
procedure with the other resistor.
Local Operation AD590 Sensor Calibration
The following procedure is for calibrating the AD590 sensor so that the
temperature measurement will be as accurate as possible. This procedure is for
local (front panel) operation. The next section will cover remote calibration of the
AD590 sensor.
1 Set the SENSOR SELECT switch (back panel) to the AD590 position (position --04).
Select the TCM-39032 for calibration by pressing the appropriate (ADJUST) LAS / TEC
switch (so that the TEC indicator is orange).
2 Connect a precision 16.8 KΩ (metal film) resistor and a precision ammeter in series 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 current in µA. 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 current as shown on the precision ammeter.
5 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).
Remote Operation AD590 Sensor Calibration
The following procedure is for calibrating the AD590 sensor so that the
temperature measurement will be as accurate as possible. This procedure is for
remote (GPIB) operation.
1 Set the SENSOR SELECT switch (back panel) to the AD590 position (position --04).
2 Connect a precision 16.8 KΩ (metal film) resistor and a precision ammeter in series at 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
current value in µA. The LDC-3900 will beep when it is ready to accept a new calibration
value.
4 Input the actual current (in µA) measured by the external ammeter (as an <nrf value>) via
the “TEC:R <nrf value>” command.