GDS-800 Series Digital Storage Oscilloscope Operation Manual 
 
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MEASURE: This oscilloscope provides various automatic measurements. Automatic 
measurements are taken over the entire waveform record, or the area specified by 
cursors. 
Select the different measurement by pressing F1 to F5 softkey. Maximum 10 
measurements can be displayed simultaneously (if both Channel 1 and Channel 2 
are connected with signal). There are fifteen measurements can be selected by 
each softkey individually. And each softkey menu can display the same 
measurement for both channels. 
z  Vpp: Vmax-Vmin (over the entire waveform). 
z  Vamp: Vhi-Vlo (over the entire waveform). 
z  Vavg: Average voltage of the first cycle of the signal. 
z  Vrms: The true Root Mean Square voltage over the entire waveform or 
specified area. 
z  Vhi: Voltage of the global high value. 
z  Vlo: Voltage of the global low value. 
z  Vmax: Voltage of the maximum amplitude. The positive peak voltage measured 
over the entire waveform. 
z  Vmin: Voltage of the minimum amplitude. The negative peak voltage measured 
over the entire waveform. 
z  Freq: Frequency measurement for the first cycle in the waveform or specified 
area. The frequency is reciprocal of the period and measured in Hertz (Hz). 
z  Period: Timing measurement takes for the first complete signal cycle to happen 
in the waveform or specified area. The period is reciprocal of the frequency and 
measured in seconds.