GDS-800 Series Digital Storage Oscilloscope Operation Manual
39
Average mode reduces displayed signal noise significantly. As the number of
averages increases from 2 to 256, the display becomes less responsive to
changes in the input signal. Using more averages reduces the effects of
displayed signal noise and improves resolution.
If any of the record lengths (except record lengths of 500) and average
number been selected (for this moment, the selection of average number is
ineffective), the instrument will use the resolution improved technology to
average entire waveform by different acquisition intervals automatically.
Therefore, user can get an average result in a higher sample rate, and better
resolution waveform.
Note: The different between record lengths of 500 and the rest is the
“sampling”. If the “record lengths” is selected to 500, the sampling will be
triggered individually. If “record lengths” is the rest number, the sampling
is triggered for once.
z Men Leng: The number of points that make up the waveform record is defined
by record length. This oscilloscope provides record lengths of 500, 1250, 2500,
5000, 12500, 25000, 50000, and 125000. For the relationship between memory
length, timebase, and sample rate, please refer to Table 5-2. To ensure a full
screen display of 500 points on the slower timebase ranges, as the timebase is
slowed down the sample rate is also slowed down.
The relationship between memory bar, viewable area, and memory length
setting are shown on Figure 5-21 and 5-22. The memory bar is always
indicating the selected memory length but be compressed into 500 points. The
viewable area will display 250 points, if the side menu turned on. If the side
menu is turned off, the viewable area should display 300 points.
The entire 125k acquisition memory can be dumped to personal computer for
further data analysis. Please refer to programming manual for details.
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