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I also wonder why the Mooshimeter’s surge protection did not work. After all, the voltage of the source is not greater than 3500VAC, which is below the Mooshimeter’s surge protection.
Supposedly, the impedance of the probe does not go lower than 1 Gohm until after 1 Mhz. So, in theory, it should have been able to withstand 20 khz. But most likely it didn’t.
Thanks for your reply, James. In that case, I am interested in a replacement meter so I would take your offer. But I still wonder what happened because I have made sure that there was no way the meter could be exposed to the high frequency 3500 VAC. I know the 3500 V source has a frequency between 6000 Hz and 20,000 Hz. So perhaps there was an impedance problem due to the high frequency. Or perhaps the high frequency damaged the sampling components of the Mooshimeter since it is limited to 8000 Hz. Anyway, if you could send me the coupon, I should be grateful!