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Accurate Low Amp Current Probe Advice

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KungFuJosh:

--- Quote from: Martin72 on November 08, 2024, 11:00:53 pm ---I'm always interested in the background of such things

--- End quote ---

Sure, but you're also more likely to try and trace out the circuit and make your own schematic for it. I won't. 😉

Martin72:
Please summarize your setup again.
Power supply, resistor, SDM3065X with the Tester software, then the Tektronix.
You connected the output of the AM503 to the SDM via 50 ohms, right?

KungFuJosh:

--- Quote from: Martin72 on November 09, 2024, 09:25:31 pm ---Please summarize your setup again.
Power supply, resistor, SDM3065X with the Tester software, then the Tektronix.
You connected the output of the AM503 to the SDM via 50 ohms, right?

--- End quote ---

There's a mediocre photo in reply 196, but here's my setup:

PSU red terminal to DMM-1 current terminal, DMM-1 black wire to 100Ω resistor to PSU black terminal.

A6302 connected on negative wire near PSU (obviously pointed at PSU).

AM503B connected to DMM-2 via 50Ω terminator and BNC to banana adapter.

TestController set to monitor reference current on DMM-1 and AM503 output on DMM-2.

My DMMs had 4 hours of warmup. AM503B and PSU had over an hour warmup. Maybe 2, I don't remember. I wouldn't do this test with less than an hour warmup on anything.

Thanks,
Josh

Martin72:
Ah, that's right, you had used two DMMs.
I'll have to solve that differently then, I only have one that can connect to the test controller software.
I would warm up the DMM and the resistor, and I would record the AM503A including the cold start.
I need to see what the trend function on the SDS3104X HD can do before I have to buy a second DMM.

KungFuJosh:

--- Quote from: Martin72 on November 09, 2024, 10:46:10 pm ---Ah, that's right, you had used two DMMs.
I'll have to solve that differently then, I only have one that can connect to the test controller software.
I would warm up the DMM and the resistor, and I would record the AM503A including the cold start.
I need to see what the trend function on the SDS3104X HD can do before I have to buy a second DMM.

--- End quote ---

In reply 181 I used my SDS2504X HD instead of the second DMM with TC. You can try that too. Replace DMM-2 with your scope to measure the current from the AM503.

I added the SDS3000X HD series to the attached device file for TestController. Let me know if it works for you. It should.

Thanks,
Josh

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