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Chapter 7
7.3.6
Local Operation LM335 Sensor Calibration
7.3.7
Remote Operation LM335 Sensor Calibration
Calibration
a.
Use a 3 kΩ metal film resistor. With the TEC output off, connect the
metal film resistor in parallel with a precision voltmeter to the sensor
input of the TEC Module.
b.
Go to the single module display by first pressing the MENU button,
then the Modules soft key, then the TEC module soft key.
c.
Press the Setup soft key and select the LM335 as the Sensor Type.
d.
Go to the calibration display by first pressing the MENU button, then
the Config soft key, then the Cal soft key, then the channel to be
calibrated. At the calibration screen, press the Sensor soft key. Follow
the on-screen instructions to complete the calibration. The calibration
can be terminated without affecting the stored constants if the Term
soft key is pressed at any point prior to completing the calibration.
a.
With the TEC output off, connect a 3 kΩ metal film resistor and a
precision voltmeter in parallel at the sensor input of the TEC module.
b.
Enter the TEC:CHAN command to select the channel to be calibrated.
Enter the TEC:SEN 3 and TEC:CAL:SEN to select the LM335 sensor
and enter sensor calibration mode.
The 6000 will be ready to receive the voltage value when, after a
TEC:CAL:SEN? query is sent, the response from the 6000 is "1".
c.
Input the actual voltage, in mV, measured by the external voltmeter (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 6000, the 6000 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.
83
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