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On Dec 20, 2019, at 11:52 AM, Alex <hpagilentgroup@...> wrote:

?I wanted to ask what is the opinion on the 34330A current shunt. Occasionally one needs to measure current somewhat above the 10Amps which is the maximum that my 973A/974A handheld DMMs allow. So I was wondering if this 30A external plugin shunt adapter would be a cost effective addition to keep on hand, of course considering that this would also require beefier connecting test leads that are current rated accordingly. But given the ebay price range for a 34330A being at $130-$300, I wonder if these numbers realistically make sense, not that I would even consider buying one just for occasional use at those prices anyhow. Since all of them have been listed for months now, and perhaps they are just the leftover overpriced bunch waiting for a desperate buyer, what would be a realistic lower price expectation for a working one in decent shape?

Or perhaps would other alternatives like a current probe adapter (34134A/34135A) be a better alternative? On the other hand I already have a FW-Bell GC-100D 200Amp AC/DC stand alone clamp-on "current gun" but it has a single range 3.5 digit readout up to 199.9, so measurements towards the lower end of that scale are not ideal, although still workable if need be. The gun also has two separate output jacks which I tried to use a couple of times but the output voltage never did make much sense in comparison to the actual measured current indicated on the display, which was correct. Maybe I was doing something wrong there, but the clamp by itself works fine when it gets used once in a while.

Of course yet another alternative that comes to mind would be to just buy a sturdy precision 0.01 or 0.001 ohm resistor at Mouser/Digikey and mount it inside a small metal enclosure with in/out jacks to use as a stand alone shunt, so it does not even need to stay attached directly or even near to the DMM.

I really don't have any very high precision needs, which are usually satisfied with either one of the multiple 4.5-digit 974A's on the bench, and certainly nothing beyond the capability of my "higher end" 3468A/3478A pair of not-calibrated for a long time DMMs. But still the idea of having a plug-n-play 30Amp quick expansion for the handheld DMM like the 34330A shunt when occasional needs arise still sounds interesting, specially when it is an HP product.

I am open to comments and suggestions. Thanks.

On Dec 20, 2019, at 11:52 AM, Alex <hpagilentgroup@...> wrote:

?I wanted to ask what is the opinion on the 34330A current shunt. Occasionally one needs to measure current somewhat above the 10Amps which is the maximum that my 973A/974A handheld DMMs allow. So I was wondering if this 30A external plugin shunt adapter would be a cost effective addition to keep on hand, of course considering that this would also require beefier connecting test leads that are current rated accordingly. But given the ebay price range for a 34330A being at $130-$300, I wonder if these numbers realistically make sense, not that I would even consider buying one just for occasional use at those prices anyhow. Since all of them have been listed for months now, and perhaps they are just the leftover overpriced bunch waiting for a desperate buyer, what would be a realistic lower price expectation for a working one in decent shape?

Or perhaps would other alternatives like a current probe adapter (34134A/34135A) be a better alternative? On the other hand I already have a FW-Bell GC-100D 200Amp AC/DC stand alone clamp-on "current gun" but it has a single range 3.5 digit readout up to 199.9, so measurements towards the lower end of that scale are not ideal, although still workable if need be. The gun also has two separate output jacks which I tried to use a couple of times but the output voltage never did make much sense in comparison to the actual measured current indicated on the display, which was correct. Maybe I was doing something wrong there, but the clamp by itself works fine when it gets used once in a while.

Of course yet another alternative that comes to mind would be to just buy a sturdy precision 0.01 or 0.001 ohm resistor at Mouser/Digikey and mount it inside a small metal enclosure with in/out jacks to use as a stand alone shunt, so it does not even need to stay attached directly or even near to the DMM.

I really don't have any very high precision needs, which are usually satisfied with either one of the multiple 4.5-digit 974A's on the bench, and certainly nothing beyond the capability of my "higher end" 3468A/3478A pair of not-calibrated for a long time DMMs. But still the idea of having a plug-n-play 30Amp quick expansion for the handheld DMM like the 34330A shunt when occasional needs arise still sounds interesting, specially when it is an HP product.

I am open to comments and suggestions. Thanks.