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6482-901-01 Rev. A / August 2012
Section 4: Range, Digits, Speed, and Filters
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Moving filter
The moving average filter uses a first-in, first-out stack. When the stack (filter count) becomes full,
the readings are averaged, yielding a filtered reading. For each subsequent reading placed into
the stack, the oldest reading is discarded. The stack is reaveraged, yielding a new reading.
When the filter is first enabled, the stack is empty. Note that a moving filter reading is not yielded
until the stack is full. The first reading is placed in the stack and is then copied to fill the other stack
locations. Therefore, the first filtered reading is the same as the first reading that entered the stack.
Now the normal moving average filter process can continue. Note that a true average is not
yielded until the stack is filled with new readings (no copies in stack). For example, in
, it
takes ten filtered readings to fill the stack with new readings. The first nine filtered readings are
calculated using copied readings.
Figure 4-5
Moving filter (count 10)
Reading #1
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Reading #10
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Reading #11
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Summary of Contents for 6482
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