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330 OUTPUT
@Sa;"MKPK
HI;
TS;"
340 OUTPUT
OSa;"MKTRACK
ON; SP IOOKZ;
TS;"
350
!turn
off signal track:
360 OUTPUT
QSa;"MKTRACK
OFF;"
370
!find
the peak of the signal; move peak to center
380
!of screen:
390 OUTPUT
OSa;"AUNITS
V;"!
MAKE READOUT UNITS VOLTS
400
!find
peak of signal;
send amplitude value to
410 !computer
420
!enter
the amplitude of the fundamental:
430 OUTPUT
@Sa;"MKPK
HI;
MKA?;"
440 ENTER
OSa;Fund,amptd-v
450
!send
marker frequency to the computer, enter
460
!frequency
value:
470 OUTPUT
OSa;"MKF?;"
480 ENTER
OSa;Fundamental
490
!make
the fundamental frequency the center freq
500
!step
size:
510 OUTPUT
OSa;"MKSS;"
520 !set the fundamental frequency units to MHz:
530
Fundamental=Fundamental/l.E+6
540 Harmonics:
!measure
the amplitudes of the harmonics:,
550 FOR Number=2 TO Max-harmonic
560 DISP "MEASURING HARMONIC
#";Number
570 OUTPUT
@Sa;"SP
20MZ;"
!set span to 20 MHz
580 OUTPUT
@Sa;"CF
UP;
TS;"
!tune
to next harmonic
590
!take
second sweep to allow spectrum analyzer to move to the
600
!center
frequency;
find the signal peak; activate
610
!signal
track:
620 OUTPUT
@Sa;"TS;"
630 OUTPUT
@Sa;"MKPK
HI; MKTRACK ON; SP IOOKZ;
TS;"
640
!turn
off signal track:
650 OUTPUT
OSa;"MKTRACK
OFF;"
660
!find
signal peak;
send amplitude value to computer
670
!enter
the amplitude of the harmonic:
680 OUTPUT
OSa;"MKPK
HI;
MKA?;"
690 ENTER
QSa;Harmonic-v(Number)
700 NEXT Number
710
!set amplitude units to
dBm:
720 OUTPUT
OSa;"AUNITS
DBM;"
730
!calculate
the fundamental amplitude in
dBm
because
740 !it was measured in volts:
750
Fund,amptd_dbm=lO*LGT(Fund_amptd_v^2/.05)
760 !calculate
the sum of the squares of the amplitudes
770
!of the harmonics;
calculate amplitudes of
780
!harmonics
(dBm):
790 Sum-sqr=O
800 FOR
I=2
TO Max-harmonic
810
Sum,sqr=Sum,sqr+Harmonic,v(I)^2
820
Harmonic-dbc(I)=20*LGT(Fund-amptd-v/Harmonic-v(1))
830 NEXT I
3-l
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