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Test Equipment Anonymous (TEA) group therapy thread

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Cerebus:

--- Quote from: Specmaster on May 18, 2018, 06:19:35 pm ---...and they weren't that far advanced when the 3478A's were made?

--- End quote ---

Yes they were. The remote calibration procedure is in the service manual.

The way most commercial cal labs process multimeters with a GPIB interface is just to hook them up to the calibrator with a set of leads, plug GPIB into a computer that drives both the calibrator and DMM, and press 'GO'. The computer identifies the DMM automatically over GPIB and then runs the whole process by 'magic'. You buy the software from your calibrator vendor. Fluke have MET/CAL, Wavetek/Datron used to have something similar and so on.

Specmaster:

--- Quote from: Cerebus on May 18, 2018, 06:59:14 pm ---
--- Quote from: Specmaster on May 18, 2018, 06:19:35 pm ---...and they weren't that far advanced when the 3478A's were made?

--- End quote ---

Yes they were. The remote calibration procedure is in the service manual.

The way most commercial cal labs process multimeters with a GPIB interface is just to hook them up to the calibrator with a set of leads, plug GPIB into a computer that drives both the calibrator and DMM, and press 'GO'. The computer identifies the DMM automatically over GPIB and then runs the whole process by 'magic'. You buy the software from your calibrator vendor. Fluke have MET/CAL, Wavetek/Datron used to have something similar and so on.

--- End quote ---
So which software should RS be using for the 3478 then, thats the question or could they be trying to wing it?

med6753:

--- Quote from: Specmaster on May 18, 2018, 06:19:35 pm ---The fact that they were not instantly aware of the 3478A at the time of requesting a quote etc is now beginning to gnaw at me that they probably do not understand how to do it and either looking for manual adjustment pots or maybe the more modern meters are just a matter of plugging a source in and then telling it via a computer interface what the value of that source actually is and they weren't that far advanced when the 3478A's were made?

--- End quote ---

Wow, that cal lab sounds like a bunch of flunkies.  :-- Sorry to hear you about your troubles. I would pursue getting some sort of refund but that might be a lost cause.

Update on the old beast. I keep making steady progress. Both channel 1 and 2 attenuator decks were FUBAR. Channel 1 responded perfectly to the Dexoit. The DMM is functional but needs a cal. Channel 2 still goes ape shit on .2V range and lower. Having one functional channel is definitely an advantage so I just have to compare readings. I'm sure I'll track it down. Hopefully that will be the last issue and then I can check the scope's overall calibration and button it up.

Cerebus:

--- Quote from: Specmaster on May 18, 2018, 07:01:57 pm ---
--- Quote from: Cerebus on May 18, 2018, 06:59:14 pm ---
--- Quote from: Specmaster on May 18, 2018, 06:19:35 pm ---...and they weren't that far advanced when the 3478A's were made?

--- End quote ---

Yes they were. The remote calibration procedure is in the service manual.

The way most commercial cal labs process multimeters with a GPIB interface is just to hook them up to the calibrator with a set of leads, plug GPIB into a computer that drives both the calibrator and DMM, and press 'GO'. The computer identifies the DMM automatically over GPIB and then runs the whole process by 'magic'. You buy the software from your calibrator vendor. Fluke have MET/CAL, Wavetek/Datron used to have something similar and so on.

--- End quote ---
So which software should RS be using for the 3478 then, thats the question or could they be trying to wing it?

--- End quote ---

Generally things like MET/CAL have built in libraries of cal procedures for a selection of (generally more popular) instruments and a scripting language that you can use to add your own procedures for other instruments. You can see the list of built in procedures for MET/CAL at https://assets.fluke.com/metcalproc/html/procedure_list.html and, spoiler alert, the HP 3478A cal procedures are included for the Fluke 5520, 5700, and 5725 calibrators.

med6753:
Forgot to add. In case you've not seen what the DM44 option looks like. And here's an oddity....it doesn't have the capability to measure AC volts. I wonder why Tek did that?  :-//

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