General > General Technical Chat

Which multimeter to buy?

(1/7) > >>

x0170:
Hi.

I already have a hand-multimeter but this piece of shit only got a usage time of <3h until the batteries are empty. I bought it on ebay because it was the only multimeter that has a 200khz oszilloscope in it and except of the battery problem it is a great product. (voltcraft gdm 704)
But now I want a new one. Which would you recommend? My criterias are:
-not to expensive <200€ (250$)
-R, C, V=~, A=~ measurement
-good measurement resolution, perhaps µV and µA if there is a multimeter that is able to do this in this price category
-diode tester, accustic sort-circuit measurement
-temperature measurement would be nice too

I heard heard of multimeters which can only measure 50Hz/60Hz AC signals, that's not what i need. I need a multimeter that can measure AC signals up to "high" frequencies (just 20MHz or something like that). Perhaps there is one that shows the measured frequency on its display?

Thanks so far. Greets.

Kiriakos-GR:

--- Quote from: shafri on June 16, 2010, 01:13:19 pm ---i never saw a DMM that can measure uV.

--- End quote ---

This one does ..  at the scale of 75 mV , you can see uV in hundreds .
And with the Fluke 87-5  , in tens ,  with one digit more I could possibly see single uV .

But who cares about such low voltage ..    

alm:
Plenty of 5.5+ digit bench DMM's that have a resolution of 1uV or better, although not necessarily the accuracy down to 1uV. Many are available for <$250 used, but usually lack features like temperature and continuity. The Keithley 177 is even called microvolt DMM. It's only 4.5 digit, but the lowest range is 20mV. Your test setup (eg. inductive pickup, thermocouple effects) will get pretty important at those low levels.

Many DMM's will go down to the uA range, even hand-helds.

Kiriakos-GR:

--- Quote from: shafri on June 16, 2010, 02:43:06 pm ---pretty nice classic :)


--- End quote ---

The only thing that I can say , are that I got truly lucky , by getting at 2010 ,
an used  80s model , that still was by far, ahead of it "time " .. 

And as time , we count the completeness about features .

If the Uni-T 71 was build at 90s ,  it would be called as spaceship ..  ;D

After all this time , with all my multimeters at hand,
the only true practical advantages of the Fluke 87-5 against the pack,
are the display speed - True RMS - more resolution .     

EEVblog:

--- Quote from: x0170 on June 16, 2010, 10:42:53 am ---I already have a hand-multimeter but this piece of shit only got a usage time of <3h until the batteries are empty. I bought it on ebay because it was the only multimeter that has a 200khz oszilloscope in it and except of the battery problem it is a great product. (voltcraft gdm 704)
But now I want a new one. Which would you recommend? My criterias are:
-not to expensive <200€ (250$)
-R, C, V=~, A=~ measurement
-good measurement resolution, perhaps µV and µA if there is a multimeter that is able to do this in this price category
-diode tester, accustic sort-circuit measurement
-temperature measurement would be nice too

--- End quote ---

Almost ant decent DMM over the $100 mark will do tall that, except the uV thing (why do you need that?). They all do 0.1uA resolution on current, more for a 4.5digit DMM. You can get 10uV resolution on a 4.5 digit meter on the 200mV range.


--- Quote ---I heard heard of multimeters which can only measure 50Hz/60Hz AC signals, that's not what i need. I need a multimeter that can measure AC signals up to "high" frequencies (just 20MHz or something like that). Perhaps there is one that shows the measured frequency on its display?

--- End quote ---

You seem to be confusing frequency measurement and actual signal amplitude measurement. And/or confusing it with an oscilloscope.
There are no meters that only read 50/60Hz, they all do at least 400Hz bandwith, and the more expensive ones might do up to say 100KHz. You generally need an oscilloscope to measure higher AC bandwidth than that.
Actual frequency measurement is another function entirely, and many meters can do 10's of MHz.

Dave.

Navigation

[0] Message Index

[#] Next page