TC_LAB datasheet(16/29 Pages) WAVELENGTH

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INTELLITUNE:

INTELLIGENT AUTOTUNE

IntelliTune adjusts the PID coefficients, as well as the voltage

limit.

1. Turn off the output current.

2. On the Control Screen, press Tune mode

to choose either

Setpoint Response or

Disturbance Rejection.

Setpoint Response: This setting has a fast time to

temperature and will overshoot.

Disturbance Rejection: This setting has a quick return to

setpoint after stability is reached. It is best for pulsing laser or

active loads, or if ambient temperature fluctuates.

Manual Tuning: Turns IntelliTune off.

Figure 24. Control Screen

3. On the Limits screen, set Max/Min Temperature Limits.

4. Adjust the setpoint off ambient temperature by about 5ºC.

5. Make sure the setpoint will not cause a

sensor bias current change by choosing a

setpoint between 0.25 to 12.075 V. The scan

is completed at a single bias current level. For

10 kΩ thermistors the troublesome temperatures

are around -23ºC and 5ºC. For 50 kΩ thermistors, the

troublesome temperatures are around 7ºC and 40ºC.

6. Press to start a characterization scan.

NOTES:

• The process takes three sweeps and can take several minutes.

The “note” icon fills with red to indicate a scan is in progress. If

any portion of the icon is red and you want to stop the process,

press the “note” icon to abort the session. If the session is

aborted, the PID coefficients revert to the previously used

coefficients.

• When the characterization process is complete, the new PID

coefficients display and the icon reverts to green.

• Tune only in temperature mode. Resistance mode is not

supported.

• A fixed, non-volatile bias current can be configured with a custom

sensor using remote command CONST:THERM with Firmware

Versions 1.99 and 2.01 and later. See the LAB Series Command

Set User Guide for more details.

SCAN THE TEMPERATURE

1. On the Control Screen, press to access the

Temperature Scan Screen.

2. Press the

Start Temp value to select the

temperature at which to start the scan. Turn the

adjustment knob to change it.

3. Press the

Stop Temp value to select the temperature at

which to stop the scan.

4. Press the

Step Size value to select the temperature

interval at which to take a measurement.

5. Press the

Time Interval value to select the amount of

time to allow the temperature to settle.

6. Insert the USB flash drive in the USB DATA slot on the

front panel.

7. Press the

Start Scan button to start the

scan. When finished, data is saved to the USB

flash drive with the filename tcscanxx.txt, where

xx starts at 00 and increments.

To stop mid-scan, press the red

Stop Scan

button. Any data collected during the aborted

scan is saved to the USB flash drive.

Figure 23. Scan Screen

The tolerance window can be very useful during a scan.

Change the time interval to STABLE by rotating the knob

counter clockwise. When the temperature reaches the

setpoint ± the tolerance window, a datapoint is recorded and

the instrument increments the setpoint to the next indicated

value. Ideally, the tolerance should be set very tight, much

less than the scan step.

Time Offset, Setpoint, Actual Temp, Sensor Voltage, TE

Current, and TE Voltage are stored to the data file.

Exiting the Scan screen aborts the scan. After the scan is

complete, the current remains enabled and at the final scan

setpoint.

To trigger a datapoint from another instrument at a given

temperature, use the TTL TempStable output or the remote

TEC Condition Register In Tolerance bit to trigger the

measurement.

NOTE: Scan only in temperature mode. Resistance mode is

not supported.

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