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Absurd chinese meter

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mikeselectricstuff:

--- Quote from: LaurenceW on March 27, 2013, 09:01:03 pm ---Hmm, a big GOTCHA for these types of "dual" meters is the fact that they must share a common ground connection. So it is not immediately easy/possible to measure both the current and voltage in some circuits, for example.  Not as flexible as two separate meters.

--- End quote ---
I can't think of many cases where having a common would  be a major problem - OK you'd probably end up seeing -ve voltage & current with common + source connection, but that would be a lot more useful then the normal either-or configuration on most meters.

Rick Law:

--- Quote from: Tepe on March 27, 2013, 10:01:25 pm ---
--- Quote from: LaurenceW on March 27, 2013, 09:01:03 pm ---Hmm, a big GOTCHA for these types of "dual" meters is the fact that they must share a common ground connection.

--- End quote ---
Why must they do that?  ???

--- End quote ---

Guess work only on my part:  I suspect they also share the A to D converter since the accuracy drops - rather, the error doubles in dual mode according to the spec.  So I suspect they are time sharing the A to D and with shorter sampling time, it is shorter on accuracy. 

skipjackrc4:

--- Quote from: c4757p on March 27, 2013, 11:39:37 pm ---Well, if they're going to put two meters in the same case, then you might as well buy two meters and skip paying the novelty price.

FWIW, even my Fluke bench meter (Fluke 45) has a dual display mode, and it's even more limited because not only do the two channels share ground, there is still only one V input. You can display V/mA, VAC/Hz, VDC/VAC, and a few other combinations. Still, I've found it useful.

--- End quote ---

I've got a Fluke 45, and I find it useful to display the max voltage on one display and the real time voltage on the other.  Or use relative mode to monitor the real time and the change.  Otherwise I'd just use two.

M0BSW:
 I wonder if they will let Dave tear one down, if its for real, he can't call it a wun hung lo, or can he !!!!!!!!!!

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