EG&G (princeton applied reasearch) 5202 Lock-in amplifier repair

[_Wim_]

Thanks! I will for sure try to put them to good use.

Do you have by any chance the service manual for the 5202 unit?

Unfortunately, I only have the 5204 operating and service manual.

Frank

No problem. I will keep on looking. Thanks also for your usefull information. It seems I really underestimated the benefits of some "old" analog gear...

[SoundTech-LG]

PAR, what an interesting company, and the founders as well...

Dicke was also responsible for developing the lock-in amplifier, which is an indispensable tool in the area of applied science and engineering. Some believe[who?] that Robert Dicke deserved a Nobel Prize just for the invention of such a powerful and ubiquitous device. Many of Dicke's experiments capitalize on lock-in in some way or another.[citation needed] However, in an interview with Martin Harwit he claims that even though he is often credited with the invention of the device; he believes he read about it in a review of scientific equipment written by Walter C. Michels, a professor at Bryn Mawr.[15][16]

https://en.wikipedia.org/wiki/Robert_H._Dicke

Now then, if you can find anything on the model 110 selective amplifier/distortion analyzer. GLIA good luck in advance!

[VintageNut]

Another feature of the Lock-In that an FFT often lacks is that a Lock-In has a continuous output. If you require uninterrupted analog output, an FFT solution may not work.

[TerraHertz]

Now I'm starting to feel embarrassed about leaving mine sitting on a shelf since I got it. Can anyone point to a text on the use  of lock-in amplifiers in general? And the 128A in particular, if there's anything.
(Yes, I'll google too, Just thought I'd ask, as I prefer old printed text books, and they tend to not show up in electronic searches.)

[VintageNut]

I just uploaded 128A combined operator and service manual to K04BB. The file is too large for this site.

[TerraHertz]

I just uploaded 128A combined operator and service manual to K04BB. The file is too large for this site.

http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=07_Recent_Uploads

Oh there it is. Not available for download yet.
I notice they say that manual is 7.3MB.
The one I already have is 7,397KB. I wonder if it's the same? Probably is. Does the first PDF page look like the attached image?
That's from the one I have, which is a really bad quality scan. All the usual faults, including stuffed up foldout schematics, pages so skew there's text missing, rooted images, etc. Yet another example of why I laugh when people say "all the old paper manuals are scanned and online now."
No, they are f-ing not.

[VintageNut]

Yes exactly the same front page.

I just uploaded 128A combined operator and service manual to K04BB. The file is too large for this site.

http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=07_Recent_Uploads

Oh there it is. Not available for download yet.
I notice they say that manual is 7.3MB.
The one I already have is 7,397KB. I wonder if it's the same? Probably is. Does the first PDF page look like the attached image?
That's from the one I have, which is a really bad quality scan. All the usual faults, including stuffed up foldout schematics, pages so skew there's text missing, rooted images, etc. Yet another example of why I laugh when people say "all the old paper manuals are scanned and online now."
No, they are f-ing not.

[CMPhysicist]

I found this topic while looking for the 5202 Manual. I received the manual after contacting the company (they were very helpful). I wanted to let anyone looking for it know that if you call the company they'll be able to email you the manual.

[jremar]

Sorry for replying to an old thread, but I called up and emailed the company, and both times they said they no longer had any documentation regarding the Model 5202:( Would you be willing to upload the manual they provided you to either the forum or somewhere else when you get the chance CMPhysicist? I've literally scoured the internet and the closest I got was a single image of the hard copy manual from a long gone ebay posting. I'd be extremely grateful if you would:)

[_Wim_]

I am not CMPhysicist, but I think that is ok also 

[precaud]

Thanks for posting that manual, _Wim_, I have a 5202 that I need to check out.

[jremar]

Oh bless your soul _wim_!! Haha that's more than okay, I'm just glad it's still around! Thanks a million for the help

[wishboneash]

I recently acquired an EG&G 5202. On preliminary testing, it seems to be working fine. However, it's missing the Vector Board that generates the magnitude and phase outputs. The I and Q signal outputs look good over the frequency range. Does anyone here have a vector board to sell (perhaps from a parts unit)? Also, is there any indication of which options are present based on serial # or other option info mentioned on the unit? Thanks to _Wim_ for posting the schematic, it's a lifesaver for anyone wanting to calibrate or align the unit.

[_Wim_]

Also, is there any indication of which options are present based on serial # or other option info mentioned on the unit?

On my unit there is a label with "modification installed". Modification "95" is the vector option.

[Kleinstein]

The vector option is not really needed that often, especially not in digitial times with the I/Q (or X/Y as other names) ouputs are digitized and send to a computer.  The analog vector calculation is limited accuracy and stability.

[wishboneash]

_Wim_ thanks for that info. Mine doesn't have that label so it wasn't that someone pulled that board out!

[wishboneash]

The vector option is not really needed that often, especially not in digitial times with the I/Q (or X/Y as other names) ouputs are digitized and send to a computer.  The analog vector calculation is limited accuracy and stability.

Yes, you are right of course. Additional analog signal processing is going to degrade the accuracy. It would have been nice to have though.