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Accurate Low Amp Current Probe Advice

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KungFuJosh:

--- Quote from: MarkL on November 08, 2024, 05:13:36 pm ---I know we're talking about the AM503B in this thread, but since I have it set up I thought I would share what the drift looks like on the older AM503.  Same test scenario, and using the same A6302 probe.

--- End quote ---

The main focus of the thread was for the probe, which I settled on the A6302. It's good to see data with different amps with it...and I'm glad I got the 503B, even if it did need some work. 😉

KungFuJosh:
Stability Test 3 Setup:
SPD3303X at 3.05V with a 100Ω CMF resistor.
SDM3055X-E in-circuit for current reference.
A6302 on negative lead of PSU.
AM503B connected to SDM3065X via 50Ω termination.

PP (min and max values): 235.5826µV over ~50 minutes.

Thanks,
Josh

Kean:

--- Quote from: KungFuJosh on November 08, 2024, 03:00:01 am ---The red trace is an SDM3055X-E. The blue trace is the SDS2404X HD. The settings are identical between both stability tests, except I think the 2nd test sampled more frequently (log rate in TC).

--- End quote ---

Ah, sorry.  I recognized the screenshot as being TestController, but it didn't register that the measurements were from two different devices.  I was thinking you were showing before and after.

MarkL:

--- Quote from: KungFuJosh on November 08, 2024, 09:23:19 pm ---Stability Test 3 Setup:
SPD3303X at 3.05V with a 100Ω CMF resistor.
SDM3055X-E in-circuit for current reference.
A6302 on negative lead of PSU.
AM503B connected to SDM3065X via 50Ω termination.

PP (min and max values): 235.5826µV over ~50 minutes.

Thanks,
Josh

--- End quote ---
So... If you're still using 10mA/div to be comparable with previous tests, that's a drift of 0.235mA.  Half of what I was getting.  Not bad!

Edit: Ah, right.  The numbers say it was 10mA/div.  Great!

Martin72:
A good result that I am tempted to reproduce.

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