Model 2700 Multimeter/Switch System User’s Manual Range, Digits, Rate, Bandwidth, and Filter 4-13
Rate and bandwidth programming examples
NOTE The following examples can be run from the KE2700 Instrument Driver using
the example named “RateBandwidth” in
Table H-1 of Appendix H.
Example #1 — The following command sequence sets ACV rate to 5 PLC. In order to set
rate for an AC function, bandwidth must first be set to 300:
VOLT:AC:DET:BAND 300 ' Set ACV bandwidth to 300.
VOLT:AC:NPLC 5 ' Set ACV rate to 5 PLC.
NOTE VOLT:AC:DET:BAND must be set to 300 before the VOLT:AC:NPLC command
can be sent.
Example #2 — The following command sequence configures channels 101 and 103 of the
Model 7700 to set integration rate to 6 PLC when they are scanned.
FUNC 'VOLT' (@101, 103) ' Select DCV function.
VOLT:NPLC 6,(@101, 103) ' Set rate to 6 PLC.
Filter
The digital filter is used to stabilize noisy measurements. The displayed, stored, or trans-
mitted reading is a windowed-average of a number of reading conversions (from 1 to 100).
The filter setup is “remembered” and can be unique for each measurement function (DCV,
ACV, DCI, ACI,
Ω2, Ω4, and TEMP). When you select a function, the instrument will
return to the last filter setup for that function.
NOTE The various instrument operations, including Filter, are performed on the input
signal in a sequential manner. See
“Signal processing sequence,” page D-2, for
details. It includes flowcharts showing where in the processing sequence that
filtering is performed.
Filter characteristics
In general, the digital filter places a specified number of A/D conversions (“Filter count”)
into a memory stack. These A/D conversions must occur consecutively within a selected
reading window (Filter Window). The readings in the stack are then averaged to yield a
single filtered reading. The stack can be filled in two ways (Filter Type): moving or
repeating. Details on digital filter characteristics are provided as follows:
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