53220A/53230A Math, Graphing, and Data Logging 6
Keysight 53220A/53230A User’s Guide 239
Reading decimation
The trend window displays a maximum of 100 readings. When greater than 100 
readings are displayed, the readings are decimated - grouped together and 
represented by decimation points. The number of readings in a decimation group 
is the reading count/100. 
Figure 6-10 is a trend chart of 100,000 readings in which the readings have been 
decimated.
Figure 6-10 Trend chart display format (with decimation).
There are 1,000 readings in each decimation group in Figure 6-10 
(100,000 readings/100 points displayed). The number of readings in each group 
changes if Show All is pressed and readings continue to be taken. 
Max: maximum reading values within groups at 
   decimation points selected by Marker1 (top) and 
         Marker2 (bottom) 
Span: difference in maximum values between marker 
 locations
Reading: number of first reading in selected 
      decimation group
Span: number of decimation groups between 
 marker locations 
Min: minimum readings 
within groups at selected 
decimation points 
Limit checking (upper and 
lower) enabled  through Math 
functions (optional)
indicates decimation 
and relative max & min 
values within the group
position window