Do multimeters "wear out" after so many years? Fluke vs. Ideal, Wavetek??
Mar 27, 2005 46 Replies
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James Sweet
The one area where I find an analog meter to really be easier is when you want to monitor the relative amplitude of some varying signal, it's a lot easier to visualize than jumpy digital numbers. For a quantitive value though digital is SO much easier.
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Dave Plowman (News)
Better DVMs have a linear bar display to show you roughly the same thing.
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Dave Plowman dave@davenoise.co.uk London SW
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S
Sam Goldwasser
A typical needle type VOM has a resistance of 20,000 ohms/V. So, on the
500 V range, it would have a resistance of 10M ohm. On higher voltage ranges, the VOM would have a higher resistance than a typical DMM. Older Simpson 260s have a 5,000 range with an input impedance of 100M ohm.
Absolutely, or should I asy Relatively!
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Sam Goldwasser
I find those pretty useless, not the same as a real needle. :)
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Dave Plowman (News)
Yup - that's common for a decent AVO on DC. But assuming no electronics,
1000 ohms/V AC is also common. Looking for the best pure non electronic one I can find, this goes to 40,000 DC and 4,000 AC.
But for measuring home mains, 1000 ohms/V is fine. Stops those silly readings caused by coupling of one sort or another.
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Dave Plowman dave@davenoise.co.uk London SW
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U
user_1
I'd think more people would be using those LCD Oscopes that are about the size of a big meter these days.
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Dave Plowman (News)
Only if you're very rich, ;-)
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M
Michael A. Terrell
Have you ever had to adjust the bias or drive on a TV transmitter with one of those? You would need new outputs before you ever got close to the proper settings.
That "feature" is a piece of crap in the real world when you need to see a dip or peak that's only a couple needle's widths apart.
Former professional electron wrangler.
Michael A. Terrell
Central Florida
J
James Sweet
you
lot
Mine has one of those, it's really not very useful though, an analog needle has *far* higher resolution and reacts more quickly.
J
James Sweet
I've used those a couple times and really don't like them much, they cost an arm and a leg and the performance is nowhere near that of a good analog scope.
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Michael Black
As I've said, the solution would be to put a tiny analog meter inside the DVM, with only a relative scale on it, for this sort of thing.
Decades ago when I thought of building a DVM, I had planned to put in such an analog meter. And I'm pretty sure one manufacturer did include a meter like this way back.
I find the sluggishness of the LCD "analog scale" makes it completely useless.
Michael
J
James Sweet
value
thing.
needle
If they included an analog meter movment it'd probably be too small to be useful and add too much to the cost. Easier to just keep an analog meter around for the situations that need it. Digital is adaquate for most things.
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Dave Plowman (News)
Trouble is including an analogue meter would *vastly* increase battery consumption.
Agreed they're not as good.
I remember seeing one which had an LCD analogue meter complete with needle. But I don't know if it had the same ballistics as a 'real' one.
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Dave Plowman dave@davenoise.co.uk London SW
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Mark D. Zacharias
Butting in....
So what are you guys' favorite meters?
I mentioned my Beckman 223 died. I always liked the Fluke 77, and don't need special stuff like frequency counter, computer connectivity or the like.
I do need it to have a tilt base and be heavy enough that simply moving leads around won't jerk it around or knock it over.
I can pick up a good condition 77 on eBay any day for around 50.00 or so, but that's an almost 20 year old model.
Is the Fluke 77 mark 3 any good? The 87 seems a bit big for my purposes, though I suppose I could get used to it. What other models would you all recommend?
Mark Z.
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Dave Plowman (News)
I've got a 179, and am very pleased with it. Does have frequency counting though - and temperature.
Auto ranging and hold with min max.
Only think I dislike is the near rigid test leads. ;_)
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Dave Plowman dave@davenoise.co.uk London SW
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M
Mark D. Zacharias
The 73 looks pretty nice - and doesn't taper down towards the base like the
77 III, which looks kind of unstable to me.
Mark Z.
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Sam Goldwasser
Some more specialized measuring instruments like laser power meters do have both. The analog and digital displays share the same space as in Coherent's Fieldmaster:
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That's been around in essentially the same form for at least 15 years.
I think they tried to do away with the delicate analog meter at one point in favor of a bargraph display but then went back to the analog meter.
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JazzMan
I've got a Fluke 87 and an 88, which is just an automotive oriented verson of the 87, and I like them both. With
10M Ohms input impedence I can measure O2 sensor voltage directly, use the analog bar to see rich/lean status, and use the averaging function to study trends. I've had my
87 for more than a decade and the 88 for nearly that long.
JazzMan
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James Sweet
the
I do like the 73, I really don't like that newer tapered design, still can't figure out why they did that, it's just not as comfortable in my hand.
J
jack
I had a beckman at one place I worked and I remember it was great for battery life. Some other meters I was always replacing the 9v battery.
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