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GW Instek GDS-800 Series User Manual User Manual

Page 39

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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.