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6-2
Averaging Filter, Math, and Buffer
Averaging filter
The average filter can be used with Delta, Pulse Delta, and Differential Conduc-
tance. There are two types of averaging filter: moving and repeating.
is explained on
The averaging filter stabilizes noisy delta measurements caused by noisy input
signals. For Delta, Pulse Delta, and Differential Conductance, readings from the
Model 2182/2182A are processed by the Model 622x as delta voltage readings.
These delta readings can then be filtered by the Model 622x.
Table 6-1
and which cannot (No). Note that the filter must be enabled before arming the
delta test.
Table 6-1
Average filter types
Delta
Pulse Delta:
Fixed output
Sweep output
Differential Conductance
1. If the moving average filter is enabled when Differential Conductance is armed, the filter type will
change to repeating.
2. If the repeating average filter is enabled when Pulse Delta (Sweep output) is armed, the filter type
will change to moving.
Averaging filter characteristics
Filter count
The filter count specifies how many delta readings (within the filter window) to
place in the memory stack. Keep in mind that there are three A/Ds for every Delta
and Differential Conductance reading, and two or three A/Ds for every Pulse Delta
reading.
When the stack is full, the readings are averaged to calculate the final filtered
delta reading. The filter count can be set from 2 to 300. However, only readings
within the filter window will be displayed and stored, or transmitted (see
window" on
page
6-3.
lists the filter types that can be used with the various delta tests (Yes)
Average Filter
page 6-4
for details).
Return to
Moving
Repeating
Yes
Yes
Yes
Yes
2
Yes
No
1
No
Yes
Section 6 topics
Model 6220/6221 User's Manual
"Filter
"Filter
type"
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