Re: 54615B Agilent Scope Amplitude Low When Measuring 120V AC
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If you use standard X10 'scope probes, one way to measure something like AC mains is to use both 'scope channels, set to ADD with one of the channels inverted.? This then gives a single trace on the 'scope which is in effect a differential measurement of the signal between the 2 probes.? With one probe on each side of the AC signal and the 'scope set to 5V/cm (and the probe earths 'earthed'), the sensitivity with a X10 probe is therefore 50V/cm, so 400V total, top to bottom of the screen. ? With 120V AC, I would expect the P:P signals to be ~340V, within the 400V total range of the 'scope screen. ? Just my 5p worth! ? 73, Mike, Mike Stevens, G8CUL/M0CUL/F4VRB. ?
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From: [email protected] On Behalf Of Robert G8RPI via groups.io
Sent: 16 November 2021 10:32
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 54615B Agilent Scope Amplitude Low When Measuring 120V AC? One thing about Neils post,
the "earth" lead on the 'scope probe is not their for safety. It's just for signal fidelity.
The resistance and current rating of the lead is not adequate to provide protection against shocks or fire. I've seen more than one 'sope lead literally smoking over the years when somone (not me) made a bad connection.
Robert G8RPI.
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