[sdiy] Anyone in the UK used RS Calibration Services?

cheater00 . cheater00 at gmail.com
Fri Mar 21 19:07:30 CET 2014


pretty cool, Neil! Thanks for the info!

On Thu, Mar 20, 2014 at 10:41 PM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Tom Bugs <admin at bugbrand.co.uk> wrote:
>>   Yeah, areas like this are more of interest to me than speed/service.
>
> Well a good place to start to get a feel for a cal house is their UKAS
> schedule (for UK cal houses).  This shows what they can calibrate to
> under the UKAS traceable calibration, although most cal places will
> also do a cheaper non-UKAS-but-still-traceable service.  Unless you're
> doing really critical stuff like aerospace or medical it is arguable
> whether you need that degree of traceability.
>
>> A few years back I bought a not-too-expensive-but-def.-not-cheap
>> hand-held multimeter which had the option to go through calibration
>> before being sent to me. I opted for that and so the meter came with a
>> sheet of test results. The thing was, though I can't remember the
>> details now, the specs/tolerances on the report didn't really seem very
>> good! (ie. the tolerance of the actual test equipment)
>
> Depending on the meter and where you bought it from it may or may not
> have been a worthwhile exercise!
>
>> So, what sort of specs were given (I should check the HP meter's specs too)
>
> Ok, so in my case, the 3478A is a 5.5-digit bench DMM.  The pre-cal
> before check was done with a photocopy of the performance page out of
> the HP manual.  Good enough for a quick check to identify any obvious
> problems.
>
> On the actual calibration certificate itself, for each test on each
> range is printed
> - applied value
> - indicated value
> - lower limit
> - upper limit
>
> To give you an example, on the 3V range there are nine tests including
> shorted input, a variety of voltages, and also at different digits
> (5.5, 4.5, 3.5).  One example line:
>
> applied: 1.000000 V
> indicated: 0.99999 V
> lower lim: 0.99992 V
> upper lim: 1.00008 V
> pass/fail: pass
>
> And so on for DC volts, DC current, AC current (@ 5kHz), AC volts
> (@20kHz, 50kHz, 100kHz, 50Hz), and 4-wire resistance.
>
> The certificate also shows the lab conditions, test procedure details,
> the calibration equipment used, and the results of a PAT test.
>
> Hope that helps.
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
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