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Ronan calibrators.
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Chris56000:
You all do realise the price of these things will now start going bloody silly because the manual with circuits has been uploaded, do you?!

Chris Williams
JohanH:

--- Quote from: J-R on February 20, 2023, 07:17:43 am ---Just in case the link goes bad in the future, here is the X85 manual and a document about the X85-RJ optional accessory:

--- End quote ---

Everyone should get into the habit of adding such web pages and documents also to the Internet Archive Wayback machine https://web.archive.org. This is probably the largest archive on the Internet.

For your convenience, the documents are now also available there:

https://web.archive.org/web/20230221121355/https://www.ronansystems.com/assets/docs/X85%20I&O.pdf
https://web.archive.org/web/20230221122147/https://www.ronansystems.com/assets/docs/X85-RJ%20Datasheet.pdf
J-R:

--- Quote from: Chris56000 on February 21, 2023, 11:54:49 am ---You all do realise the price of these things will now start going bloody silly because the manual with circuits has been uploaded, do you?!

Chris Williams

--- End quote ---
Haha, maybe so, although these are perhaps a bit clunky and of limited use.  I snagged an X88 a while back to play around with, hence my interest in this thread.
J-R:
Update on the X88 I recently purchased:

It was manufactured in 2000.  It reminds me of something from the 80s, though.  The buttons and general operation can be a bit obnoxious, especially having to move the test leads around constantly for the different functions.

I went through the full calibration procedure and adjusted everything, about 20 different potentiometers, half for the input, half for the output.

For the input, it's essentially a 15,000 count DMM, but has very limited capabilities compared to a typical DMM, both in functions and ranges.  Input protection is nearly non-existent.

Compared to the PDVS2mini, the DCV output is nothing special, of course.  What you set on the display is what you get, but the "imaginary" digit past that is a little bit jumpy.  Same goes for the 100mA DC output.  Strangely, you can't actually select 100mA, only 99.99mA.  This variable DC constant current output is probably the main thing I can see using this for at the moment, as it's more stable/precise than any of the bench power supplies I have.

The 'interesting' feature I like on this is the extensive RTD/Thermocouple simulation capabilities (it can read via the inputs as well).  You can pick a specific temperature in C/F and simulate this to a DMM.  So for example, I can choose K-type thermocouple, set the output to 900F and connect it to a typical DMM and bam, 900F on the DMM.  Fun.

It also can do some 4-20mA loop functions, but I don't have any use for that at the moment.  The previous owner was an HVAC tech, so they probably did use that.

So ultimately a cute/interesting relic, but how useful it is to you will depend on your situation.
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