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| Multimeter selection for production testing |
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| tszaboo:
I'm setting up a production line testing tool. It an in-circuit functional testing JIG, that measures a bunch of things, and makes sure that the board we ship is within specifications. There is one test that's still missing, measuring the current consumption of the DUT. The original design called for a Keysight 34465A for this. And well, it's not within the budget to buy a new one. So I'm searching for an instrument that can do current measurements, connect to the test system with Ethernet (USB might be acceptable). I though to ask the collective brainpower of the EEVBlog forum, because you know more instruments than I do. So here are specs: - Desktop multimeter - Measures ~100uA with 10uA accuracy - Measures ~2A with 1% accuracy - Can switch between these ranges without disconnecting the DUT - Has Ethernet and SCPI, maybe USB - Doesn't look like a toy - Not an absolute nightmare of software to automate My baseline is now the Siglent SDM3045X which I think would fulfill the role. I'm basing this on no actual evidence, just a guess, having never used Siglent multimeters. Honorable mention are all the Owon multimeters that look like a toy, and the Hantek 365* that looks like the piece but doesn't have uA range. And the Keysight U2741A that's somehow even more expensive than their 6.5 digit desktop meters. |
| Antonio90:
I apologize if this doesn't add anything but, maybe it is cheaper to source a DMM with good voltage specs and a good shunt? EDIT: It probably doesn't add much. I can test later today current measurements for the SDM3045, but your requirements are well within spec, and, at least with the "EasyDMM" software, logging is really not a problem via LAN. Haven't tested it otherwise. |
| tszaboo:
--- Quote from: Antonio90 on April 25, 2024, 09:16:59 am ---I apologize if this doesn't add anything but, maybe it is easier to source a DMM with better voltage specs and a good shunt? As the measurement is automated converting from V to A shouldn't be an issue. --- End quote --- It needs to measure 100uA and ~2A on the same contacts. If I would make the system from scratch, I could do a range switching with a relay ie, but the rest of the system is already put together. I also don't like to measure ~100uV because thermal effects. |
| tautech:
--- Quote from: tszaboo on April 25, 2024, 09:05:44 am --- My baseline is now the Siglent SDM3045X which I think would fulfill the role. --- End quote --- Have you considered the SC models for their 16 channels of acquisition ? They start from SDM3055-SC so a bit dearer than the SDM3045X but all can do dual measurements, regardless of the model. Unfortunately they need be a -SC model from the factory as the scanner card cannot be retrofitted. |
| 2N3055:
--- Quote from: tszaboo on April 25, 2024, 09:05:44 am ---I'm setting up a production line testing tool. It an in-circuit functional testing JIG, that measures a bunch of things, and makes sure that the board we ship is within specifications. There is one test that's still missing, measuring the current consumption of the DUT. The original design called for a Keysight 34465A for this. And well, it's not within the budget to buy a new one. So I'm searching for an instrument that can do current measurements, connect to the test system with Ethernet (USB might be acceptable). I though to ask the collective brainpower of the EEVBlog forum, because you know more instruments than I do. So here are specs: - Desktop multimeter - Measures ~100uA with 10uA accuracy - Measures ~2A with 1% accuracy - Can switch between these ranges without disconnecting the DUT - Has Ethernet and SCPI, maybe USB - Doesn't look like a toy - Not an absolute nightmare of software to automate My baseline is now the Siglent SDM3045X which I think would fulfill the role. I'm basing this on no actual evidence, just a guess, having never used Siglent multimeters. Honorable mention are all the Owon multimeters that look like a toy, and the Hantek 365* that looks like the piece but doesn't have uA range. And the Keysight U2741A that's somehow even more expensive than their 6.5 digit desktop meters. --- End quote --- I have a question about this: "- Can switch between these ranges without disconnecting the DUT" Does that mean : - I don't want to change cables from LO/HIGH range inputs on meter. or - DUT cannot ever be disconnected while we change ranges in meter. Like in an device is measured in standby and then in active mode but without reset because meter disconnected one shunt and then connected the other. It must preserve connection and only change shunt value. |
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