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Message ID: 379     Entry time: Tue Sep 24 12:19:20 2019
Author: Stephen 
Type: General 
Category: General 
Subject: Dirty ABO test run prior to PZT Subassembly Bonding  

The 40m Bake Lab's Dirty ABO's OMEGA PID controller was borrowed for another oven in the Bake Lab (sound familiar? OMC elog 377), so I have had to play with the tuning and parameters to recover. This bake seemed to inadequately match the intended temperature profile for some reason (intended profile is shown by plotting prior qualifying bake for comparison).

The parameters utilized here are exactly matching the prior qualifying bake, except that the autotuning may have settled on different parameters.

Options to proceed, as I see them, are as follows:

  1. reposition the oven's driving thermocouple closer to the load and attempt to qualify the oven again overnight
  2. retune the controller and attempt to qualify the oven again overnight
  3. proceed with current bake profile, except monitor the soak temperature via data logger thermocouple and intervene if temperature is too high by manually changing the setpoint.

 

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image_showing_20190923_abo_qualifying_bake.png
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