Day 72

Morning
A lot happened today. Jim stopped by the office to ask about the Moore isolators on EBW 4. I didn't know anything about them other than they serve the same purpose as an API unit. Apparently, one of the isolators happened to be wired incorrectly. The Moore unit was fried though (you could smell it). Jim went down to the instrument shop, and returned with an API module. The current shunt still didn't work like it was supposed to when he got it put in. The readout was going from 4-->0 mA instead of 4-->20 mA.

Afternoon
Jim flipped the leads on the API to get the right readout. That produced some good results. With the welder going, he called Rich to take a look at what I call "gun physics." I went back into the office to try to work on some EBW 2/3 documentation. While I was out tracing pressure switches, Rich showed up. We started to run the welder. With a few small adjustments of the focus, he got a beam that could weld. We lost the D.P.'s at one point and then the filament went upon start up. I need to get the gun pulled and repaired for another try tomorrow. I never had time to work on S9 and the beam patterns.