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| Fluke 732B DC Standard Teardown |
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| branadic:
--- Quote --- I made a LM399 standarsd, still planning to ovenise the whole thing and buils it in the 731A housing. --- End quote --- Do you want to share your schematics? What does it look like? I've build the "10V Buffered Reference" from LinearTechnology datasheet with LT1001 in ceramic package with 5ppm/K 0805 chip resistors for gain setting and a crystal heater on top (40.8±1.5°C but <0.1K regulation accuracy). The reference is now running several weeks on a 34401A under lab conditions (~22.4±0.5°C) and I can observe a drift by ±10µV correlating with humidity in the lab (corner value 1 RH<40%, corner value 2 RH>45%). Can't say if this is a sensitivity of my reference or the 34401A. I'm still searching for the ultimate circuit. One idea could be a LM334 current source in hermetical package feeding the LM399 combined with a chopper amp at the output. So I'm interested in your solution. |
| SimonSatCom:
Very nice teardown. At the moment I'm trying to build my own precision reference using the LTZ1000A. http://www.simonthenerd.com/LTZ1000A.htm I have used the Fluke 732B as kind of my reference so it is nice to see some real pictures from inside the beast. :) |
| VR2XGI:
any Fluke 732A teardown?? :-+ |
| VR2XGI:
--- Quote from: amyk on April 08, 2013, 11:23:19 am ---Here you can see the resistors in the oven taken out(!): http://bbs.38hot.net/thread-177-1-1.html Interesting shape to them... --- End quote --- 38hot is a very good forum , I have been there many year :-+ :-+ :-+ |
| Smokey:
Link with the pictures from OP: https://xdevs.com/doc/Fluke/732B/Fluke%20732B%20DC%20Standard%20Teardown%20-%20Page%201.pdf |
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