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Hello,

I recently purchased a A6302 current probe from eBay and keep getting 588 errors on my AM503B amplifier. I purchased another AM503B amp and A6303 current probe to compare since I couldn’t determine whether it was the amp or probe causing the error. The 588 error follows the A6302 probe.

When I try and degauss, I get the error. I can use the AC amplifier and get a scope waveform similar to my working current probe. But when I put the amplifier in DC mode, the probe doesn’t give a signal at all, apart from a DC offset that cannot be adjusted with the amplifier pot. I’m trying to follow the schematics but am not seeing why this might be right off. Does anyone know why I would able to get an AC signal but not a DC? Is this the hall sensor that might be defective?

Thanks,

Dave

Dave:

I have gone through many of these probes and the most common failure I have found is broken wires in the connector that mates to the amplifier.
Second most is issues with the hall effect sensor which would usually not cause the error that you are seeing.
On the older probes, the sensor offset was set using select on test resistors.
The newer probes have a pot with an adjustment hole near the ground terminal so you can compensate for aging easier..

ed

Hi David,

Did you ever resolve this issue? I'm observing something similar, though I can't see any signal in DC or AC coupling. I'm trying to determine if the AM503B or A6302 is at fault (or both). FYI I also posted about this on EEVBlog ((error-code-588)/msg4127581/).]

Thanks
Matt

For the A6302 probe, you are correct, the AC signal is generated by the coil, while the DC signal is created by the hall-effect sensor. Might be a broken wire inside the probe, or possibly inside the cable, but worst case it's the hall sensor itself that's damaged. Dropping the probe could crack the sensor (silicon, i.e. a glass plate). I haven't seen any replacements available anywhere for these, and mechanically I get the impression that this would be nearly impossible to replace, even if you could find one (but I could be wrong).