Gregory's ServerTo correct for errors, a correction factor is added, a function of rotation. This is implemented with a metal plate, warped into the correct shape with 20 tiny screws. A cam measures its position, which is added to the rotation with a differential gear mechanism.
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 @kenshirriff use a vfd! They go up to 400hz, and probably cost $100. I use a vfd for... reasons... you can adjust, well, everything. I got a 3 phase output but turned out I only needed 1 phase   @kenshirriff  @kenshirriff "glad" to see 115V/400Hz was already in use back in the 50s... @kenshirriff looking forward to reading/seeing more about it once you have a chance to power it up! i enjoy seeing this sort of thing that fits neatly at the intersection of #avgeek, #vintagecomputing, and a whole ton of other topics that escape me atm. @kenshirriff Why that particular voltage and frequency? Did the creators learn all their EE through dance instead of words? @Urethramancer Apparently 400 Hz is popular for avionics rather than 60 Hz because the higher frequency means the transformers are much smaller.
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@kenshirriff That thing looks like a nightmare to keep calibrated once the parts start to wear...  @kenshirriff What errors does that encompass? I would expect that this accounts for nonlinearity of the sensor, and that there's no need to account for errors in the amplifier itself (because we don't rely on ~any other properties than behaviour at input equal to 0). Are there other sources of systematic error I'm missing? |
Just converting a temperature to rotation took a big wedge of gears. Although gear-based computation is bulky, an analog computer was the best solution at the time.
I hope to power up the CADC soon and get it working. Inconveniently, it takes 115 volts AC at 400 Hz.