![background image](http://html2.mh-extra.com/html/keithley/6487/6487_user-manual_3951658066.webp)
Range, Units, Digits, Rate, and Filters
4-5
Median filter
The median filter is used to determine the "middle-most" reading from a group of readings
that are arranged according to size. For example, assume the following readings:
20mA, 1mA, 3mA
The readings are rearranged in an ascending order as follows:
1mA, 3mA, 20mA
From the above readings, it is apparent that 3mA is the median (middle-most) reading.
The number of sample readings used for the median calculation is determined by the
selected rank (1 to 5) as follows:
Sample readings = (2
×
R) + 1
where; R is the selected rank (1 to 5)
Note that the median filter throws out the oldest of the ranked values, and it is especially
useful for noise characterized by unwanted spikes.
Digital filter
Digital filter types
An additional filter parameter is type (type is either moving or repeating).
Moving Filter — Every time a reading conversion occurs, the readings in the stack are
averaged to yield a single filtered reading. The stack type is first-in, first-out. After the
stack fills, the newest reading conversion replaces the oldest. Note that the instrument does
not wait for the stack to fill before releasing readings.
Repeating Filter — Takes a selected number of reading conversions, averages them, and
yields a reading. It then flushes its stack and starts over.
Содержание 6487
Страница 13: ......
Страница 15: ......
Страница 35: ...1 20 Getting Started Model 6487 User s Manual...
Страница 47: ...2 12 Connections Model 6487 User s Manual...
Страница 61: ...3 14 Measurements and Sourcing Voltage Model 6487 User s Manual...
Страница 85: ...7 8 Remote Operation and Commands Model 6487 User s Manual...
Страница 86: ...A Specifications...
Страница 88: ...B GeneralMeasurement Considerations...
Страница 94: ...C ExamplePrograms...
Страница 101: ......
Страница 103: ......
Страница 104: ......