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ABM-4082
Filter Types
A: Moving Average
The Moving average filter uses a first-in, first-out stack. When the stack becomes 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. Shown in Figure 4-1.
B: Repeat average
For the repeating filter, the stack is filled and the conversions are averaged to yield a reading. The stack is
then cleared and the process starts over as shown in Figure 4-1.
Figure 4-1
Moving average and repeating average filters
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 responder
to input signal change.
4.1.3
Relative
The relative operation could be used to null offsets or subtract a baseline reading from present and future
readings. When relative function is enabled, Model DMM uses the present reading as a relative value.
Subsequent readings will be the difference between the actual input value and the relative value.
You can define a relative value for each function. Once a relative value is set for a measurement function,
the value is the same for all ranges. For example, if 2V is set as a relative value on the 10V range, the
relative is also 2V on the 1000V, 100V, 1V or 100mV ranges.
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