Can a 10 Vrms signal that is connected for some seconds in the input to harm it if the QA403 is out of the usb?
Hi @John1, no it cannot. When the USB is disconnected, the input attenuator is engaged by default (that is, relay must be energized to turn off attenuator). I would guess even 100Vrms applied to input on unpowered device won’t cause a problem for several seconds.
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Thank you very much!