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Message ID: 382     Entry time: Tue Oct 22 10:25:01 2019
Author: Stephen 
Type: General 
Category: General 
Subject: OMC PZT Assy #9 and #10 Production Cure Bake  

OMC PZT Assy Production Cure Bake (ref. OMC elog 381) for PZT Assy #9 and #10 started 27 September 2019 and completed 28 September 2019. Captured in the below figure (purple trace). Raw data has been posted as an attachment as well.

We have monitored the temperature in two ways:

1) Datalogger thermocouple data (purple trace).
2) Checking in on temperature of datalogger thermocouple (lavender circles) and drive thermocouple (lavender diamonds), only during initial ramp up.

Comments on bake:

  • No changes were made to the tuning or instrumentation of the oven between the successful qualifying bake obtained on 26 September (ref. OMC elog 380). However, the profile seems to have been more similar to prior qualifying bake attempts that were less successful (ref. OMC elog 379), particularly as the oven seems to have ramped to an overtemperature state. I am a bit mystified, and I would like to see the oven tuning characterized to a greater extent than I have had time and bandwith to complete within this effort.
  • The maximum datalogger temperature was 104 °C, and the duration of the soak (94 °C or higher) was 68 minutes. This was in contrast to a programmed soak of 2.5 hours and a programmed setpoint of 84 °C.
  • The drive thermocouple did appear to be under-reporting temperature relative to the datalogger thermocouple, but this was not confirmed during the soak period. Neither thermocouple was calibrated as part of this effort.


 

Attachment 1: OMC_ABO_PZT_Curing_Bake_effort_201906_thru_201909.xls  10.210 MB  Uploaded Tue Oct 22 11:30:01 2019
Attachment 2: production_cure_bake_pzt_assys_9_and_10_20190927.png  59 kB  Uploaded Tue Oct 22 11:33:19 2019  | Hide | Hide all
production_cure_bake_pzt_assys_9_and_10_20190927.png
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