Figure 3-1 Moving Average And Repeating Filters; Filter Types; Response Time - Keithley 2010 User Manual

3-4 Measurement Options

Filter types

The moving average filter
full, the measurement conversions are averaged, yielding a reading. For each subsequent
conversion placed into the stack, the oldest conversion is discarded, and the stack is re-averaged,
yielding a new reading.
For the repeating filter
yield a reading. The stack is then cleared and the process starts over. Choose this filter for
scanning so readings from other channels are not averaged with the present channel.

Response time

The filter parameters have speed and accuracy tradeoffs for the time needed to display, store,
or output a filtered reading. These affect the number of reading conversions for speed versus
accuracy and response to input signal changes.
Figure 3-1
Conversion #10
Moving average and
repeating filters
Conversion #1
Conversion #10
Conversion #1
(Figure 3-1) uses a first-in, first-out stack. When the stack becomes
(Figure 3-1), the stack is filled and the conversions are averaged to
Conversion #11
#9
#8
#7
#6
Reading
#5
#1
#4
#3
#2
Conversion
A. Type - Moving Average, Readings = 10
Conversion #20
#9
#8
#7
#6
Reading
#5
#1
#4
#3
#2
Conversion
B. Type - Repeating, Readings = 10
Conversion #12
#10
#11
#9
#10
#8
#9
#7
#8
Reading
#6
#7
#2
#5
#6
#4
#5
#3
#4
#2
Conversion #3
Conversion #30
#19 #29
#18 #28
#17 #27
#16 #26
Reading
#15 #25
#2
#14 #24
#13 #23
#12 #22
#11 Conversion #21
Reading
#3
Reading
#3