Products > Test Equipment

Repair of Return LeCroy/Preamble 1855A differential amplifier

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rx8pilot:
Awesome!

I just purchased another one (my second) it should arrive in a few more days. Hopefully that one is in good shape.

The assembly was clearly very difficult - so many carefully hand placed parts. Do you have a suggestion for getting two calibrated? Do you know if any schematics or cal documents can be available (legally).
It's a unique piece of equipment and useful in power supply design. They still command a lot of money including the matched probe sets. 

Glad you chimed in.

sbvr4:
Just picked up one of these up today. Does anyone know the calibration procedure for this? Specifically, the PVG, which is roughly +.8112v off. Not very precise. :palm:

Everything else seems within spec, but the PVG is way off and would like to correct the error. Any help would be greatly appreciated.

Also, @Steve_tech any chance the enclosure is the PacTec CF-225? It looks right, but PacTec oddly don't seem to offer dimension for that unit. I have a single rackmount unit that I would like to convert to the smaller bench model.
 
Thank you

rx8pilot:
Perhaps if the PVG is that far off it is not a calibration challenge - but a repair of something broken.

If you need to take it apart - good luck. It is a weird one that is also rather delicate.

ZGoode:

--- Quote from: steve_tech on February 02, 2017, 09:07:56 pm ---Too bad I didn't see this earlier. I was involved in calibration, repair, and sustaining engineering for the 1822 and the 1855.

It was difficult cramming all the guts in a PacTec box. The have been around for more than 15 years. Not bad for test equipment.

They were never intended to be serviced by the user. The original calibration procedure was 26 pages, single spaced, double sided.

Early on, production was one per day.

--- End quote ---

Total long shot, but having worked on the 1855 (hopefully non-a version), you don't happen to know anywhere I can find those manuals for it?  I have a 1855, but can only find the manuals for a 1855A.

fenugrec:
FYI, there are some 1855 schematics available from w140 TekWiki since recently.
Was hoping to find schematics for 1822 but they have apparently not surfaced yet ?

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