I measured amplitude/voltage of my generator output and it is totally different from what is written on generator display?

The peak to peak vaule of Spooky settings is 20V,
it is the range between the minimum(-10V) and maximum(+10V).
Such as sine wave,the wave crest to wave Hollow is -10V to +10V,
so peak-to-peak value is 20V p-p.

It is highly recommended not to use a multimeter. If you insist on using it, set the measurement frequency at 50hz.
You could test out RootMeanSquare by using multimeter, it is not able to test out peak-to-peak value.
For the second picture, the setting of frequency is zero, so the output is DC signal, -10v is normally.

The voltage amplitude is correct. Please no worries.

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