Output - ILX Lightwave LDT-5525 User Manual

When a linear sensor device (such as an AD590 or LM335) is used, a linear equation is used. If a linear sensor's
calibration is not known, set C1 = 0.00, C2 = 1.00. For more information on linear sensor calibration, see Appendix C.
The range of values for C1 and C2 are -9.99 to +9.99.
To read C1 or C2, press the CAL button until it sequences to the desired constant. The C1 or C2 indicator will become
lit to indicate which constant is selected. To change the value, turn the ADJUST knob until the correct value is
displayed.
Appendix A contains an explanation of the Steinhart-Hart equation and a computer program to determine these
values for any thermistor.
Appendix C contains information on sensor calibration constants for AD590 and LM335 sensors. Since these devices
are used over their linear range, the constants C1 and C2 are used in this case to determine a linear approximation of
the temperature, rather than the Steinhart-Hart non-linear approximation which applies for thermistors. The
appropriate algorithms are automatically implemented whenever the sensor type is selected via the back panel
SENSOR SELECT switch. However, C1 and C2 must be changed by the user.

2.4.6 Output

The OUTPUT section contains the ON switch and indicator. The ON indicator is lit whenever the output is on.
Pressing the ON switch will toggle the TEC current output on or off.
Conditions Which Will Automatically Shut Off the OUTPUT
1. Temperature Limit
2. External (Temp Limit) Safety Switch is closed (see Section 2.6.3)
3. Booster Changed (While Output On), (see Section 2.6.4)
4. Sensor Open (While Output On)
5. TEC Module Open (While Output On)
6. SENSOR SELECT Switch Moved (While Output On)
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