Calculation Facility - AOR SDU5600 Operating Manual

Section 5-6

5-6 Calculation facility

Maximum value hold (MAX)
Press the FUNC +7 keys to activate this
facility, the legend MAX will be displayed
on the graticule section of the LCD.
Press the CLR key to exit from max hold.
Without the MAX feature being used, each
new sweep across the frequency spread
will renew the signal activities over and
over. However, with the MAX feature in
use each sweep will be retained as data is
built-up until the process ends. This is
particularly useful to detect intermittent
signals which come and go over a period
of time.
Averaged value (AVR)
Press the FUNC + 8 keys to activate this
facility, the legend AVR will be displayed
on the graticule section of the LCD.
You are required to enter a sampling cycle
between 2 and 31 to produce averaged
results.
Press the CLR key to exit.
This facility is designed to provide the plot
pattern which has been obtained by
averaging the detected signals repeated
over the number of times in the sampling
cycle. This facility enables the SDU5600
to produce a stable signal pattern even if
each signal is fluctuating in signal strength.
Median (MED)
Press the FUNC + 9 keys to activate this facility, the legend MED will be displayed on the graticule
section of the LCD. The plot is designed to provide the signal pattern based over a sampling cycle
of between 2 and 4 and is useful to plot impulse noise. The sampling cycle can be entered via the
ten-keys followed by ENT Press the CLR to exit.
Theory of median filter
AVR
FIRST SWEEP
SECOND SWEEP
THIRD SWEEP
:
30TH SWEEP
31ST SWEEP
32ND SWEEP
30
N = 31
PLOT AS THE SWEEP PROGRESSES
(1 + 2) / 2 = A
(1 + 2 + 3) / 3 = B
: :
(1 + 2 + 3 + ..... 30) / 30 = A1
(1 + 2 + 3 + ..... 30 + 31) / 31 = B1
((B1 X 31 / 32) + 32) / 32