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Multimeter selection for production testing

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bdunham7:

--- Quote from: 2N3055 on April 25, 2024, 04:45:37 pm ---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.

--- End quote ---

You would think it would be simple enough to design them so they don't, but I've seen quite a few meters that have an interruption in the current shunts when switching ranges, including the HP 34401A I just tested. It's typically a few milliseconds as relays change position--in the case of the 34401A it is a set of DPST contacts switching from one to the other.  In the OP's case, a simple bypass capacitor along with making sure to do the switching at the 100µA level should be good.

2N3055:

--- Quote from: bdunham7 on April 25, 2024, 04:52:29 pm ---
--- Quote from: 2N3055 on April 25, 2024, 04:45:37 pm ---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.

--- End quote ---

You would think it would be simple enough to design them so they don't, but I've seen quite a few meters that have an interruption in the current shunts when switching ranges, including the HP 34401A I just tested. It's typically a few milliseconds as relays change position--in the case of the 34401A it is a set of DPST contacts switching from one to the other.  In the OP's case, a simple bypass capacitor along with making sure to do the switching at the 100µA level should be good.

--- End quote ---

Yes, that is why I pointed out that this needs to be tested, because I also saw it on several occasions.
Not to mention when you use scanner...

As I said, it is not a deal breaker, it is easy enough to put in a bypass element (a capacitor, a scripted relay, whatnot) but you must know how it behaves.
You can even design your own shunt+switch and calibrate, measure voltage and calculate.

tszaboo:
I kid you not, we found a 34465A, that was connected to a test setup, and was doing nothing.  :-DD
Production people didn't even turn it on anymore. Anyway, I was kind of looking forward trying the SDM3045X/SDM3055X. I guess next time.

KungFuJosh:

--- Quote from: tszaboo on April 26, 2024, 04:11:35 pm ---I kid you not, we found a 34465A, that was connected to a test setup, and was doing nothing.  :-DD
Production people didn't even turn it on anymore. Anyway, I was kind of looking forward trying the SDM3045X/SDM3055X. I guess next time.

--- End quote ---

I guess I could trade you my SDM3045X that's upgraded to the SDM3055X-E for your 34465A. 🤔

mawyatt:

--- Quote from: tszaboo on April 26, 2024, 04:11:35 pm ---I kid you not, we found a 34465A, that was connected to a test setup, and was doing nothing.  :-DD
Production people didn't even turn it on anymore. Anyway, I was kind of looking forward trying the SDM3045X/SDM3055X. I guess next time.

--- End quote ---

Keep looking around you may find a KS3458A also connected that they forgot about  ;D

Best,

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