DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
7. The Voltmeter
If from the input signals only the size is important and not the time information or frequency components, a voltmeter
is a suitable instrument to measure with. The software is equipped with a two channel digital voltmeter. The voltmeter
functions as follows:
• A measurement is performed (minimal 200 samples).
• The measured data is processed, e.g. for calculating the RMS value or the mean value. Eleven different operations
are available.
• The calculated values are displayed, e.g. add CH1 and CH2 and display on channel one. Sixteen different display
methods are available.
For each channel the voltmeter has up to three displays to present the measured and calculated values. The value displayed
in a display is fully configurable. Also for each display a bar graph is available, to give a quick overview of
the signal size in relation to the input range.
Of all four instruments, the voltmeter has the lowest settings priority. This means that if for example the oscilloscope
is active, the record length, pre samples and post samples of the oscilloscope are used in the voltmeter. The voltmeter
only uses post samples to perform the calculations. If less than 200 post samples are available, no calculations are
done and a message is displayed. The only setting that can be changed by the voltmeter when the oscilloscope or
spectrum analyzer is active, is the sample frequency.
The measure system of the voltmeter
The voltmeter takes 200 samples of the input signal with a certain sample frequency. These 200 samples are used to
perform several calculations.
The Voltmeter
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