Jennie W,
Since Daniel put in a TEC controller for the JAC temperature servo we will no longer use the current version of the guardian control loop so I have set JAC_HEATER guardian to SERVO_OFF. The TEC is turned on and the set point is at 25.4 Degrees C.
The servo controller can be reached by going to sitemap->IOO->JAC Overview->Controller. To turn it off select the 'OFF' button in the top right corner of the controller. The loop can be measured by using the excitation button noted in the picture.
I will trial this over the weekend so I can double check it doesn't drive the JAC away from the control point.
I'm running a script called inject_TEC.py which does a swept sine from 0.01 to 100 Hz on the TEC heater servo. This has an amplitude of 0.001V so shouldn't have a big effect on the temperature.
See photo for the control signal, JAC heater drive voltage and the error point.
It will take this voltage away from the DAC output votlage used to drive the JAC heater and so shouldn't disrupt the temperature control of the JAC so it will stay locked.
The current measurement takes 31 minutes and I started it at 04:24:37 UTC.
It stopped at 04:56:03 UTC.
I will leave the JAC Heater servo running as it was working servoing the temperature to 25.4 degrees C all weekend (apart from a brief period when Masayuki unlocked for calibration measurements earlier today.
