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Entry  Wed Jul 24 18:13:05 2013, Chloe, Notes, ECDL, Current Driver 
    Reply  Thu Jul 25 18:13:11 2013, Chloe, Notes, ECDL, Current Driver/TEC thermistor_temperature-resistance.xlsx
       Reply  Fri Jul 26 17:51:02 2013, Chloe, Notes, ECDL, Current Driver/TEC 
          Reply  Mon Jul 29 19:06:31 2013, Chloe, Notes, ECDL, Current Driver/TEC 
             Reply  Tue Jul 30 17:55:21 2013, Chloe, Notes, ECDL, Current Driver/TEC working!.jpg
Message ID: 1259     Entry time: Fri Jul 26 17:51:02 2013     In reply to: 1255     Reply to this: 1262
Author: Chloe 
Type: Notes 
Category: ECDL 
Subject: Current Driver/TEC 

I figured out how to calibrate the potentiometers for the TEC. The three potentiometers (labeled P, I, and D) control how quickly the TEC can reach the desired temperature, and how much the temperature oscillates. I have all on their minimum setting, because increasing any of the potentiometers causes the actual temperature to overshoot the desired temperature many times before reaching an equilibrium. It is a very finicky system, and they don't have that much adjustability so it took me a long time to get right. I can adjust the temperature (resistance) to be within a few ohms of the desired temperature right now, which translates to within 0.01 degrees Celsius. This settles in 3-4 minutes. The reason my accuracy isn't as good as it could be is I have a makeshift mount I'm using to simulate the ECDL. When it is attached to the aluminum box, the temperature variations should be even smaller. Everything is in place for TEC to be implemented quickly into the actual ECDL. I will likely need to calibrate the potentiometers again with the ECDL. 

I need a banana cable connector to add to the circuit so I can see if I can get the current driver up and running with the laser diode. I will do this Monday.

This afternoon I worked on writing up a draft of my second progress report and abstract so that I have time to edit it before it's due next Friday. The draft right now is on the SVN in the ECDL folder. I still need a few pictures, and I left some space for stuff I plan to do next week. 

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