I think you might be right in a lot of cases .....These calibration days I would guess as long as it takes to print off the Certificate and put some tamper stickers on it.
Discuss A Calibrated Question (Multi Meters) in the Electrical Forum area at ElectriciansForums.net
I think you might be right in a lot of cases .....These calibration days I would guess as long as it takes to print off the Certificate and put some tamper stickers on it.
I would guess many dont really care.They want their MFT back and as cheap as possible .They just presume they work until something really goes wrong with it .I would have thought that operating temperatures within the MFT would have to be stabilised before any meaningful tests can be carried out against the manufacturers specification, this can't be accomplished by a walk in test?
I have a non-rcd socket near my CSU for testing Zs and using an RCD plug only for testing MFT, I also use 50m reel cable for resistance. These are solid state devices, the connections,clips leads are more susceptible to variation...keep a history of tests. Any real variation after replacing leads etc ...get it calibrated....every year is OTT.That is the aspect of my MFT I can't check myself. The closest I can do is test one of my home sockets to see it has not changed much which, while better than nothing, is not quite enough to be sure.
I have a CalCard and really would recommend it as a handy way to check the low/high R ranges. I also have other meters that can be used to verify AC volts but the Zs & RCD stuff then I only have the one MFT.
Well I thought I would update the Leighton Buzzard Edmundson's info as free food and drinks and the fact it states 'Stratton Food Hall' I imagine it's top nosh. That's breakfast and dinner sorted, I'm banking on loads of other freebies
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Not sure about qualifications, but Time Electronics make all sorts of precision standards and cal kits. This one is about £5k and does MFT:
5030 Electrical Tester Calibrator
Clearly displays measurements and settings via Large LCD. For calibration of RCD, loop, insulation, earth testers and multifunction installation testers.www.timeelectronics.com
Of course you need to have the cal kit calibrated by someone with even better equipment...all the way to the NPL or similar!
I have a couple of Time products, including their 1068 resistor standard (0.01% to 0.1% depending on value) and 1044 DC voltage/current calibrator (0.05%) but after work changes they have not been back for factory/standards lab cal.
I hope you took it up with them?Never trust these calibration days. I have said before we sent some in and mixed in by accident was an analogue insulation continuity tester which just read open continuity all the time. Came back with a calibration certificate so i tried it, still open continuity even with various leads.
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