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Registered Member #119
Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114
Hey, I got an old ionization gauge controller that I am trying to figure out the pinout on for the output. I'm looking for advice on how to take measurements etc from it to figure out which is grid, filament, and the ion collector. Its a Norton (NRC) 831. Its got a plug like a thermocouple would normally have. The ion gauge I was going to use with it is a California Equipment Services 8136F and has an NW40 klein flange. The gauge itself isn't a problem since I can see inside it and its a standard pinout (like this ). I tried making a schematic for the controller, but its pretty tedious, especially since components aren't labeled with R1 etc and the transistors are a bit hard to figure out the pinouts for. Of the 8 output pins, 6 are actually hooked up. This is one more than the standard number of pins. My gauge, however, does have a center tapped grid as well, but I don't think I need to worry about that. I was able to get 150VDC out of it as well as some pins giving off 16VAC, which sounds like I am at least perhaps within reasonable ranges (not sure about that AC though why its there). Two pairs seem to be at equipotential. The controller supports either a BA or a triode gauge, mine is a BA tube. It also has dual TC controllers, I haven't tried messing with those yet, but I've got a pile of TCs (anyone need one...), so I should probably see if I can get a reading off of those on this controller. There is a "start" button on it which also puzzles me. If I press it, two lights light up the panel meter for the ion gauge pressure, and nothing else happens. Finally, there is a switch that is for "off" and "outgas" which I guess would turn the filament on or off. There is a relay near the output of the gauge which probably turns the filament on. I'd probably get the 15VDC if I could get it to click on. I was thinking that maybe since no gauge is hooked up, its trying to intelligently not cook it under atmospheric pressure, although hurting my tests. Perhaps it refuses to turn on without one of the two TC gauges being at low pressure? I'll see if I can dig around for camera and maybe add some pics, especially if someone thought a certain part of it would be useful to have a pic of. Note that this is the first time I've worked with an ion gauge before, I've more or less used some at school before, but there were already wired etc. Any help would be appreciated. Thanks! Some notes I made on the circuitry near the output plug can be found here:
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Ionization gauge
