Keithley 2100 User Manual page 53

Model 2100 6 1/2-Digit Resolution Digital Multimeter User's Manual
Figure 4-2
Setting the AC Filter using the front panel
DCI
PREV
DCV
DISPLAY
FILTER
NEXT
EXTRIG
OFF SINGL E
ON
POWER
TRIGGER
Remote interface operation
From your PC terminal, use the following command to specify the filter type:
DETector:BANDwidth_20
Digital filter
Definition
The Model 2100 uses an averaging digital filter to yield a reading from 2 to 100 past measurement
readings (past measurement readings are stored in stack memory). You can select one of two
modes of digital filter operation: Moving Average mode or Repeating Average mode.
The moving average filter puts the specified number of reading conversions in a first-in, first-out
order. The very first measurement reading simply fills up the stack. To yield a reading for display,
the filter produces an average of the stacked measurement readings every time a new
measurement reading is available, replacing the oldest reading in the stack. In the Repeating
Average mode, the multimeter waits for the measurement reading stack to fill up, then take an
average to produce a reading for display. It then flushes the stack and starts over with an empty
stack. Consequently, the repeating digital filter yields one reading for display every specified
number of measurement readings.
The digital filter is not available for diode, continuity, frequency, and period measurements.
Default
The digital filter is enabled, is in Moving Average mode, and is set to use the last 10 readings by
default.
How to enable/disable the digital filter
Press the FILTER key to switch the digital filter function. The FILT annunciator indicates the state
of the digital filter; when it is lit, the filter is enabled.
How to configure the digital filter
You can configure the digital filter through either the front panel operation or the remote interface
operation.
2100-900-01 Rev. D / September 2011
FUNCTION
ACI 4
PERIOD
AC V AC V 2 2 2 2
FREQ CONT TEMP
LIMIT S MX+B dBm dB
%
RATIO
DIGITS NULL
MIN/MA X
MATH
HOLD
AUTO
STORE L OCA L SHIFT
RECA L L
TRIGGER
MEMORY
Return to
CAT 1000V
CAT 600V
SENSE
4 WIRE
HI
RATIO
200V
REF
PEA K
LO
SETUP
RANGE
3A
PREV NEXT
INPUTS
RMS
LOCK
F
R
ESC
ENTER
A UTO
FRONT/REAR
MENU
CONFIG
Section Topics
Section 4: Front Panel Operations
INPUT
V
CONFIG
1000V
PEA K
PREV NEXT
500V
PEA K
ENTER
3A 250V
AMP S
AC V AC V
4-5