Re: Multimeters (was: AC causing PV inverter to cycle into wait mode)


"M Q" <up5qsNOSPAM2502@xxxxxxxxxxxxxx> wrote in message
news:rkBDi.1605$6T5.1365@xxxxxxxxxxx


xPosTech wrote:

On 9/3/2007 10:05 PM, M Q wrote:

3% of 240 is 7.2. 3% of 250 is 7.5. The accuracy is specified as a
percentage of full scale, not a percentage of the reading. So for
240 V you would use the 250 V scale. For 268 V you would use the 500 V
scale
with an accuracy of 15 V.

Accuracy of an analog meter increases toward midscale. The greatest
inaccuracy is at full scale (either way - 0 or 500). I would think a 260
would give very accurate readings measuring 240VAC and 268VAC on the
500VAC scale, approaching the accuracy of a DVM.

Even if the analog meter was exactly accurate, you would loose a percent
or so in readability due to paralax between the needle and the scale
unless the scale has a mirror (as some do).

I think all good analog meters (all Simpson's anyway) have mirrored scales,
so parallax really is not an issue. I always do mid-scale readings on the
260.

Using an analog meter probably takes a little more skill and time to be as
accurate, though. It is pretty hard to misread a DMM. If I were making my
living with a meter in my hand and time was money, I would use a DMM.

As someone who occasionally needs to use a meter, and someone who
appreciates Starrett mics, S-K wrenches, Klein hand tools, etc., I truly
appreciate a quality, hand crafted tool. There is just something special
about the experience of using a quality analog VOM compared to reading a
digital display. Sort of like watching a movie or reading the book. The book
takes more time, but it is far more engaging. :)

Won't argue, though, DMM's are cheaper and faster...but sometimes that
really does not matter.


.

Relevant Pages

  • Re: Some advice for Learnwell
    ... me in pedagogy class and I didn't see the wisdom of it until much ... are reading through the ninth position. ... What scale system do you use or have you devised your own? ... some exercises to help develop sight reading in those areas. ...
    (rec.music.classical.guitar)
  • Re: Some advice for Learnwell
    ... are reading through the ninth position. ... I don't use a scale 'system', I use the Segovia fingerings. ... using timeless shifts such a squeeze shifts, ...
    (rec.music.classical.guitar)
  • Re: checking weight on a moving belt
    ... A product is moved at a certain speed on a conveyor belt over a scale ... which registers the product's weight. ... It's then necessary to integrate the reading over ...
    (sci.physics)
  • Re: Strain gage question
    ... with a inexpensive digital volt meter? ... Self contradicting sentence as you don't include the permissible errors of ... I would like to build an electronic scale using a strain gage, ... Could I load the scale with a 400 pound weight, observe the reading on ...
    (sci.electronics.basics)
  • Re: AC measures 27volts
    ... Probably because you're using a digital voltmeter, which is reading a very ... very low amperage induced current in the conductor you're testing. ... an analog meter instead, and you'll probably see -zero- volts. ...
    (alt.home.repair)
Loading