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Accurate Low Amp Current Probe Advice

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MarkL:

--- 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 ---
What DMM do you have?  If you have one that has a jack in common with a volts input and a current input, you can wire it up and use your computer to read current through the 100R resistor, then switch DMM functions to read the voltage output from the AM503B.  Keep flipping back and forth reading current and volts.

KungFuJosh:

--- Quote from: MarkL on November 10, 2024, 02:19:23 am ---...

--- End quote ---

Mark, could you please check your AM503B and count the electrolytics? Mine has three 220uF caps, but I want to confirm that's the correct value before I replace them (they were the only new caps present when I received the 503B).

Thanks,
Josh

MarkL:

--- Quote from: KungFuJosh on November 10, 2024, 02:34:23 am ---
--- Quote from: MarkL on November 10, 2024, 02:19:23 am ---...

--- End quote ---

Mark, could you please check your AM503B and count the electrolytics? Mine has three 220uF caps, but I want to confirm that's the correct value before I replace them (they were the only new caps present when I received the 503B).

Thanks,
Josh

--- End quote ---
Sure!  I have:

  (3) 220uF @ 16V, Nichicon VX(M) series
  (6) 100uF @ 25V, Nichicon VX(M) series
  (2) 1000uF @ 50V, Nippon Chemi-Con SME series
  (2) 2200uF @ 50V, Nippon Chemi-Con SME series

KungFuJosh:

--- Quote from: MarkL on November 10, 2024, 03:22:35 pm ---Sure!  I have:

  (3) 220uF @ 16V, Nichicon VX(M) series
  (6) 100uF @ 25V, Nichicon VX(M) series
  (2) 1000uF @ 50V, Nippon Chemi-Con SME series
  (2) 2200uF @ 50V, Nippon Chemi-Con SME series

--- End quote ---

Thank you! There's (7) 100uFs in mine, I think one is hiding from you. 😉

There's also a cute little 1uF near the 220uFs.

Thanks for checking that, now I can replace those last 4 caps.

Thanks,
Josh

MarkL:

--- Quote from: KungFuJosh on November 10, 2024, 03:29:43 pm ---
--- Quote from: MarkL on November 10, 2024, 03:22:35 pm ---Sure!  I have:

  (3) 220uF @ 16V, Nichicon VX(M) series
  (6) 100uF @ 25V, Nichicon VX(M) series
  (2) 1000uF @ 50V, Nippon Chemi-Con SME series
  (2) 2200uF @ 50V, Nippon Chemi-Con SME series

--- End quote ---

Thank you! There's (7) 100uFs in mine, I think one is hiding from you. 😉

There's also a cute little 1uF near the 220uFs.

Thanks for checking that, now I can replace those last 4 caps.

Thanks,
Josh

--- End quote ---
You're right I missed the 1uF @ 50V near the output amplifier.

Double checking, the 503B I've been using for the above tests indeed only has (6) 100uF.  However, the other 503B I have has (7) like yours, and I now see the empty pads on the first unit.  The pads look factory fresh, so I guess Tek decided it was unnecessary.  The board layouts look identical and also have the same part number (A9F-1631-00, at the edge near the front panel).

For the record, the 100uF that's missing is the one that's in the center, flanked by two diodes on the top and two TO-92 transistors on the bottom.

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