Environmental Conditions; Warm-Up; Calibration Adjustments; Thermistor Calibration - ILX Lightwave LDT-5525 User Manual

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3.2.2 Environmental Conditions

Calibrate this instrument under laboratory conditions. We recommend calibration at 23°C ± 1.0°C. When necessary,

however, the LDT-5525 Temperature Controller may be calibrated at its intended use temperature if this is within the

specified operating temperature range of 0 to 40°C.

The LDT-5525 Temperature Controller should be allowed to warm up for at least 1 hour before calibration.

There are two calibration adjustments that need to be made for the LDT-5525 Temperature Controller. They are

calibration of sensor measurement, and calibration of the ITE current measurement and limit circuits.

If a problem arises during calibration which prevents its normal completion, the calibration may be aborted with no ill

effects by simply pressing the OUTPUT switch. This is possible because the calibration values are not saved to non-

volatile memory until the last step of each calibration procedure.

The following procedure is for calibrating the 100 µA and 10 µA constant current sources so that the thermistor

resistance measurements for these ranges will be as accurate as possible. This procedure calibrates the resistance

measurements of the thermistor. This procedure does not calculate C1 and C2. For information on calibrating the

thermistor sensor, see Appendix A.

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