Annex
NRP2
394User Manual 1173.9140.02 ─ 07
Averaging/filters
The power values to be measured are sampled by the sensors. The sampling values
then undergo two-stage filtering before they are made available as measured values.
The first filter stage is a time integration. The integration time is either set explicitly
(ContAv mode: SENS:APER
, Timeslot mode: SENS:TSL:WIDT and Trace mode:
SENS:SWE:POIN and -:TIME) or determined automatically ("BurstAv mode").
Filtering (averaging) is the second filter stage, which is configured via the command
path SENS:AVERage. These settings are used to obtain a stable (noise-free) result up
to a required accuracy. This is done by means of a digital filter, which has a variable
length: the longer the filter, the more stable the result.
Manual filter setting
The filter-length automatic mode is deactivated and the filter length is set in power-of-
two numbers.
*RST
SENS:AVER:STAT ON 'activates filtering
SENS:AVER:COUN:AUTO OFF 'switches off filter-length automatic mode
SENS:AVER:COUN 4 'permanently sets filter length to 4
INIT
FETCh?
Automatic filter setting
SENS:AVER:COUN:AUTO:TYPE NSR | RES is used to select whether the noise com-
ponent should remain below a specific threshold (NSR) or the measurement result
should be stable up to a specific accuracy (RES). To avoid long measurement times,
SENS:AVER:COUNT:AUTO:MTIM can be used to specify a maximum measurement
time. The maximum filter length is set such that the measurements do not exceed this
time, even if the desired stability has not yet been obtained.
Example
*RST
SENS:AVER:STAT ON 'activates filtering
SENS:AVER:COUN:AUTO ON 'switches on filter-length automatic mode
SENS:AVER:COUN:AUTO:TYPE RES 'sets automatic mode to RESolution
SENS:AVER:COUN:AUTO:RES 3 'maintains 3 places noise-free in the result
INIT
FETCh?
Example
*RST
SENS:AVER:STAT ON 'activates filtering
SENS:AVER:COUN:AUTO ON 'switches on filter-length automatic mode
SENS:AVER:COUN:AUTO:TYPE NSR 'sets automatic mode to NSRatio
SENS:AVER:COUN:AUTO:NSR 0.01 DB 'maximum noise component in the result
SENS:AVER:COUN:AUTO:MTIM 10 S 'but does not measure more than 10 s
Programming Measurements
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