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Hi James, Here is the link to the current leakage meter.
I have the RevI PCB. I am getting the signal on both voltage and current channels in different amounts under different conditions. It was not until I used just one buffered dc voltage channel 2 with leads coiled that I realized that the source of the unwanted signal was AC EMF. It is an unmistakable signal with one dc channel. On any other channel it could be mistaken for spurious noise. The reason this is a problem is that the unwanted signal peaks deep into the measurement range of the current clamps I have. I have three ways to get a current signal from a clamp: 1 mv=1 amp, 10 mv=1 amp, or 1 ma=1 amp. The pumps I most commonly work with, work between 8 and 12 amps and the peak on the unwanted signal is about 4ma at worst.
NEW STRANGE BEHAVIOR
While I was trying to explain my last issues I now have worse and stranger issues with the latest beta release. If I choose AC voltage (120VAC input) on channel 2 8000 hz sample rate then go to the buffered graph I get a sine wave with a saw tooth wave inserted on the second quadrant only, after a few updates I get a sine wave followed by lost connection. I have found only two ways to reestablish the connection.
One is the reset button and that causes the boot-loader to start. The only way to move ahead from there is to load the firmware again. The other way is to pull the batteries and reinsert them. The battery method will connect normally with the meter. There seems to quite a bit of randomness to the problems I am seeing they don’t always repeat.