Keithley 2002, User Manual

Page: 90 / 366

Front Panel Operation
2-73
2.9.3 Response time
The various filter parameters have the following effects on
the time needed to display, store, or output a filtered reading:
• Filter type: The time to the first reading is the same for
both types, but thereafter averaging mode yields a faster
reading than repeating mode. Also, advanced has a
faster response to changes in the input signal than
averaging.
• Number of reading conversions: Speed and accuracy
are tradeoffs.
Conversion #10
#9
#8
#7
#6
#5
#4
#3
#2
Conversion #1
Reading
#1
A. Type - Average, Readings = 10, Mode - Moving
Conversion #11
#10
#9
#8
#7
#6
#5
#4
#3
Conversion #2
Reading
#2
Conversion #12
#11
#10
#9
#8
#7
#6
#5
#4
Conversion #3
Reading
#3
Conversion #10
#9
#8
#7
#6
#5
#4
#3
#2
Conversion #1
Reading
#1
B. Type - Average, Readings = 10, Mode - Repeating
Conversion #20
#19
#18
#17
#16
#15
#14
#13
#12
Conversion #11
Reading
#2
Conversion #30
#29
#28
#27
#26
#25
#24
#23
#22
Conversion #21
Reading
#3
Figure 2-31
Moving and repeating filter modes
• Noise window: For the advanced type, a tradeoff of
speed, accuracy, and response to input signal changes.
2.9.4 Auto filtering
For those measurement functions with a filter, one of the pos-
sible selections is automatic filtering. Depending on the mea-
surement function and type, the AUTO selection may disable
filtering. Auto filtering is summarized in Table 2-35.