User`s guide

53220A/53230A User’s Guide 195
53220A/53230A Math, Graphing, and Data Logging 6
The number of readings to average is specified as:
SLOW - 100 readings: with +
100 ppm change required to reset filter
MEDium - 50 readings: with +
300 ppm change required to reset filter
FAST - 10 readings: with +
1000 ppm change required to reset filter
The filter is reset if the measurement function or channel is changed, if
another set of readings is initiated, or if a measurement is outside the range
corresponding to the number of readings specified (SLOW, MEDium, FAST).
After the filter is reset, the reading is the average of all readings up to the
specified response (10, 50, 100). At that point, the reading is the moving aver-
age of the last 10, 50, or 100 measurements. Equal weighting is applied to all
measurements in the average.
A reset (*RST) or instrument preset (SYSTem:PRESet) sets the response to
FAST.
Smoothing Example
//frequency measurement of expected 1 kHz signal - ch 1
//reduce noise on 5,000 readings
CONF:FREQ 1E3,(@1)
SAMP:COUN 5000 // take 5000 reading
CALC:STAT ON // enable CALCulate1 subsystem
CALC:SMO:STAT ON // enable moving average filter
CALC:SMO:RESP SLOW // average 100 readings
INIT
Scaling Functions
When scaling is enabled statistical analysis, limit checking, histograms, and
trend charts use scaled data. Figure 6-2 shows the display with scaling func-
tions enabled.