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PWRBW
Power Bandwidth
Item
TRACE LABEL
REAL
The PWRBW command first computes the combined power of all signal responses contained in a trace array. The
command then computes the bandwidth equal to a percentage of the total power, and returns this value to the
controller.
For example, if the percent of total power is specified as 100%) the power bandwidth equals the frequency range
of the CRT display, which is 100 MHz if the frequency span per division is 10 MHz. If 50% is specified, trace
elements are eliminated from either end of the array until the combined power of the remaining signal responses
equals half of the original power computed. The frequency span of these remaining trace elements is the power
bandwidth returned to the controller.
The following example computes the power bandwidth of a trace, and returns 99% of the total power.
10
OUTPUT 718;"VARDEF P-BW,O;"
20
30
40
OUTPUT 718; "D2;EM;PU;PA380,1000;"
45
OUTPUT 718;"TEXT @QQ% POWER BANDWIDTH = @;DSPLY P,BW,6.3;"
4 6
OUTPUT 718;"TEXT @ MHZ@;HD;"
END
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2 9 6 P r o g r a m m i n g
PWRBW
Description/Default
Alpha character.
TRDEF
statement.
Define a variable, P-BW, to store the power bandwidth.
Find the power bandwidth and move it into P,BW.
Convert P-BW to MHz.
Set display size to D2, erase trace C memory (which sets the display address to 30721,
and set pen position to x = 380, y = 1000.
Write the results on the analyzer screen.
PERCENT OF
User-defined label declared in
Range Restriction
AA-
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