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6-10
Range, Digits, Speed, and Filters
Repeat
fi
lter
The Repeat Filter places the specified number of measurement conversions into a stack and
averages them to yield a single Repeat Filter reading. The stack is then cleared, and the process
starts over. For example, if the repeat count (stack size) is 10, every 10 measurement conver-
sions will yield a single reading. Figure 6-3 illustrates the Repeat Filter process. The maximum
count (stack size) for the Repeat Filter is 100. Note that setting the count to one disables the
Repeat Filter.
Choose the Repeat Filter for sweeping so readings for other source levels are not averaged
with the present source level.
Median
fi
lter
The Median Filter is used to pass the “middle-most” reading from a group of readings that
are arranged according to size. For example, assume the following readings:
2mA, 1nA, 3nA
The readings are placed in a stack, re-arranged in ascending order as follows:
1nA, 3nA, 2mA
From the above readings, it can be plainly seen that 3nA is the median (middle-most) read-
ing. Therefore, the 3nA reading is allowed to pass, while the other two readings are discarded
(filtered out). The Median Filter provides a good method to reject noise spikes.
The number of reading samples (stack size) for the Median Filter is determined by the
selected rank (1 to 5) as follows:
Sample readings = 2n + 1
Where; n is the selected rank (0 to 5)
Conversion #10
#9
#8
#7
#6
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#2
Conversion
#1
Repeat
Reading
#1
•
•
•
Conversion #20
#19
#18
#17
#16
#15
#14
#13
#12
Conversion #11
•
•
•
Conversion #30
#29
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#27
#26
#25
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#22
Conversion #21
•
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•
Repeat
Reading
#2
Repeat
Reading
#3
Figure 6-3
Repeat filter
(count 10)
Summary of Contents for 6430
Page 26: ......
Page 32: ......
Page 78: ...2 14 Connections ...
Page 98: ...3 20 Basic Source Measure Operation ...
Page 138: ...5 30 Source Measure Concepts ...
Page 156: ...6 18 Range Digits Speed and Filters ...
Page 168: ...7 12 Relative and Math ...
Page 176: ...8 8 Data Store ...
Page 202: ...9 26 Sweep Operation ...
Page 248: ...11 22 Limit Testing ...
Page 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Page 418: ...17 108 SCPI Command Reference ...
Page 450: ...18 32 Performance Verification ...
Page 477: ...A Specifications ...
Page 489: ...B StatusandErrorMessages ...
Page 498: ...B 10 Status and Error Messages ...
Page 499: ...C DataFlow ...
Page 503: ...D IEEE 488BusOverview ...
Page 518: ...D 16 IEEE 488 Bus Overview ...
Page 519: ...E IEEE 488andSCPI ConformanceInformation ...
Page 523: ...F MeasurementConsiderations ...
Page 539: ...G GPIB488 1Protocol ...
Page 557: ......