stevez said:In some situations the lack of a formal system of calibration can be very expensive. In a large organization - or between companies that put together sub-assemblies - subtle differences can be significant. The paper trail adds little value - I'll agree with that. Ignoring the process entirely could be a huge mistake.
I would agree that for home use and for many commercial applications, that formal calibration adds little value. What you really should do though, is periodically check your equipment against known points of reference. I have some friends who work with high quality equipment - they will calibrate their personal equipment -and I'll check mine against theirs on occasion. Quite often the result is "close enough". If there was significant error you might then choose to make some adjustments- or investigate if the error seems like more than just calibration.
Nigel Goodwin said:OK - calibration ISN'T about your meter (or scope, or whatever) being accurate - it's SOLELY about having a paperwork trail to show it's been calibrated.
Nigel Goodwin said:In most meters how would you make such adjustments?, they don't normally have any adjustable components inside? - at least not for individual ranges!.
I agree, but select a new 1% resistor and measure a range of them, 100HarveyH42 said:Basically, if you measure a resistor, and it reads within it tolerance, I'd say its good enough.
Hello seem you know about meters, can you help me, trying to find the comparison of analog/digital displays on meter, between their LCD, LED, bargraph, lamps and buzzers.Nigel Goodwin said:OK - calibration ISN'T about your meter (or scope, or whatever) being accurate - it's SOLELY about having a paperwork trail to show it's been calibrated. For home use it would be a complete waste of time, unless your entire home is run under ISO9001? - which is simply a paper trail system, not a quality system of any kind. Products made under it might be completely useless, and regularly fail, but as long as the company have a nice paper trail in place it meets all the requirements.
Bear in mind, if you buy a brand new meter or scope, you still have to send it away to be 'calibrated', or you fail your ISO9001.
I wouldn't consider sending a meter away for calibration, either at home or at work!.
Quest said:Hello seems you know about meters, can you help me, trying to find the comparison of analog/digital displays on meters, in their LCD, LED, baragraph, lamps buzzers.
An analog meter is nice because it "filters" the voltage and you can read the average of a varying voltage. An autoranging DVM is useless when the voltage is not constant. A digital meter is good because it is much more accurate than an analog. An LCD display with backlight is good but hard to read in dim light with no backlight. LCD is low power so is used with portable, battery operated tools. An LED display useses more power but is easy to read. The bar graph has limited resoluton and is difficult to interpret, good for level indication.
That is exactly what we did, we had a Tektronix 475a/dm44 oscilloscope and a 8060a Fluke calibrated to a traceable standard and used these instruments as standards to check the other meters and other scopes.I don't know why they don't just get the expensive meters calibrated, use them to check that the cheaper meters are still in rage and throw them away if not.
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