Products > Test Equipment
Accurate Low Amp Current Probe Advice
KungFuJosh:
Some more tests...
5mA and below was less stable, but not bad. I think that's mostly because what I'm seeing is +/-1mA if I wait long enough.
After 12 minutes, 10mA was showing 11mA. That's significantly better. The previous probe would drift down down down and fall off the screen in a few minutes. 🙄
KungFuJosh:
Here's a quick stability test. Not terrible! 😉
KungFuJosh:
Upgrading the NVRAM chip was easy using a $10 CH341A programmer.
I used Rico's BIN file and cleared the data and wrote that to the chip. I dunno if that was really necessary, but I figured it was worth it to test the programmer before inserting the new chip.
I don't have the adapters needed to do an actual calibration, but thankfully, it's pretty accurate already. I'll eventually see about finding or making the needed adapters so I can calibrate it for fun.
I installed the new chip and powered up the 503B, and it worked as normal with the factory default warning. Then I removed the chip, and wrote the serial number to it and reinstalled it in the 503B. No more default settings warning.
I attached the 341A programmer software since I had trouble finding a virus free version. This one was clean.
Thanks,
Josh
Martin72:
The Tektronix current clamp is still one of the best you can get, especially if it's used and therefore cheaper, because new it costs a fortune.
It's all the more annoying that you made such a bad purchase, I was luckier.
KungFuJosh:
--- Quote from: Martin72 on November 07, 2024, 09:34:58 pm ---The Tektronix current clamp is still one of the best you can get, especially if it's used and therefore cheaper, because new it costs a fortune.
It's all the more annoying that you made such a bad purchase, I was luckier.
--- End quote ---
Were you though? 😉
My crap probe got replaced with a good probe for no extra fee. Now I'm messing with the amplifier to see how new lower ESR filter caps affect it.
The new probe measurements looked good, right?
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