Name: Keithley 2002
Brand: Keithley
Rating: 4 (1 reviews)

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Filter

Filtering stabilizes noisy measurements. The Model 2002 uses a digital ﬁlter, which is based

on reading conversions. The displayed, stored, or transmitted reading is an average of a number

of reading conversions. When a ﬁlter is enabled by pressing FILTER (FILT annunciator turns

on), the selected ﬁlter conﬁguration for that measurement function is in effect. Pressing FILTER

a second time disables the ﬁlter.

Filter types

The Model 2002 has two types of digital ﬁlters; averaging and advanced. Both types are a

simple average of 1 to 100 reading conversions. The difference is a user-programmed noise

“window” for the advanced ﬁlter. The noise window (expressed as a percentage of range) allows

a faster response time to large signal step changes. See the User’s Manual for complete informa-

tion on ﬁlter types.

Filter modes

There are two ﬁlter modes: moving or repeating. The moving ﬁlter uses a ﬁrst-in, ﬁrst-out

stack. When the stack becomes full, the measurement conversions are averaged, yielding a read-

ing. For each subsequent conversion, the new conversion is placed into the stack, the oldest con-

version is discarded, and a new reading is averaged.

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. See the User’s Manual for complete infor-

mation on ﬁlter modes.

Auto ﬁlter

With auto ﬁltering, the instrument automatically conﬁgures the ﬁlter based on the selected

function and measurement type.

2-16 Measurement Options

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