Function
This control in the Meter Toolbar specifies which function to use. The options are as follows:
DC Volts
AC Volts
dB
Frequency
This control in the Meter Toolbar specifies which function to use. The options are as follows:

The DC component, or average input voltage.
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The RMS AC voltage. This excludes any DC component.
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AC volts converted to dB, with respect to 0.776 V.
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Frequency of the AC component, in hertz.
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