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| Multimeter selection for production testing |
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| 2N3055:
--- Quote from: mawyatt on April 25, 2024, 04:17:58 pm ---The KS34465A and SDM3065X have no problem handing these current ranges for a single set of terminals. KS has a 3A max terminal that also supports 1ua range (as well as a 10A range on another terminal) and the SDM has 10A terminal that supports a 200ua range. Also the DMM6500 terminal that surrorts 3A and 10ua range. We just checked all of these to be sure :-+ Best, --- End quote --- That I have no doubt, and that is what Tszaboo said was specified in original testing proc (KS34465A was). But if slight adjustment to test scripts can enable him to use SDM3045X that is 4-5x price reduction, and he will still be well over accuracy specs needed. I still recommend checking if SDM3045X switches between needed ranges seamlessly or is it "brake-before-make" when switching shunts. |
| mawyatt:
@2N3055, Agree, the SDM3065X would easily fit the requirements, so suspect the SDM3045X would suffice. Also as you mention, if the OP has control over sequencing, then seems that the DMM could be set to 2A range before invoking the higher current Active Turn On DUT mode. Only issue there is if selected DMM does the "make before break" current range transition which is easily verified, but can't imagine that this would ever be "break before make" as this would introduce a dangerous condition. Best, |
| bdunham7:
--- Quote from: 2N3055 on April 25, 2024, 04:24:04 pm ---I still recommend checking if SDM3045X switches between needed ranges seamlessly or is it "brake-before-make" when switching shunts. --- End quote --- Specifically with the SDM3045X there is also the issue of the 'ranges within ranges' where it switches internally at 2V even in the 6V range. I wonder if that also happens at 2A in the 6A range--that might be problematic or at least super-annoying since this is right at the specfied test point. Locking it in the 10A range (with less resolution) or getting an SDM3055 instead would be solutions to that issue,if I'm not imagining it. |
| 2N3055:
--- Quote from: mawyatt on April 25, 2024, 04:38:04 pm ---@2N3055, Agree, the SDM3065X would easily fit the requirements, so suspect the SDM3045X would suffice. Also as you mention, if the OP has control over sequencing, then seems that the DMM could be set to 2A range before invoking the higher current Active Turn On DUT mode. Only issue there is if selected DMM does the "make before break" current range transition which is easily verified, but can't imagine that this would ever be "break before make" as this would introduce a dangerous condition. Best, --- End quote --- Well, I'm a "better safe than sorry" type of guy. I would rather him test. Just in case... And to make sure people understood me correctly, problem is that if meter goes temporarily open circuit when switching between ranges. It should not but better check. Although that can be worked around too with bypass relay that you enable relay, switch, disable relay, measure. |
| 2N3055:
--- Quote from: bdunham7 on April 25, 2024, 04:42:09 pm --- --- Quote from: 2N3055 on April 25, 2024, 04:24:04 pm ---I still recommend checking if SDM3045X switches between needed ranges seamlessly or is it "brake-before-make" when switching shunts. --- End quote --- Specifically with the SDM3045X there is also the issue of the 'ranges within ranges' where it switches internally at 2V even in the 6V range. I wonder if that also happens at 2A in the 6A range--that might be problematic or at least super-annoying since this is right at the specfied test point. Locking it in the 10A range (with less resolution) or getting an SDM3055 instead would be solutions to that issue,if I'm not imagining it. --- End quote --- I personally would recommend upgrade SDM3055 to better future proof it for not much more money. But even locking SDM3045X in 10A range would be good enough for 1% needed. But I agree I would go with SDM3055 and have no compromise option for less than 500€ |
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