Agilent Technologies 75000 Series C - Manual (Page 68)

Test 2-9: Total Harmonic Distortion (cont’d)
Test Procedure
(cont’d)
Table 2-9. THD Test Points
Frequency
(Hz)
Test Limits*
(dBc)
100 E3
250 E3
1 E6
4 E6
10 E6 -60
-60
-48
-36
-36
* Through 9th harmonic
Example Program
This program performs the Total Harmonic Distortion Test.
10 ! RE-STORE "SINE_THD"
20 DIM Freq(1:5)
30 !
40 !---------- Set up I/O path and reset AFG ----------
50 ASSIGN @Afg TO 70910
!AFG I/O path
60 OUTPUT @Afg;"*RST;*CLS" !Reset AFG
70 !
80 !---------- Initialize variables ----------
90 Dbm_out$="24DBM"
!AFG output
100 !
110 DATA 100E3,250E3,1E6,4E6,10E6
!Read in freqs
120 READ Freq(*)
130 !
140 !---------- Set up Spec Analyzer ----------
150 CLEAR SCREEN
160 PRINT "Set up Spectrum Analyzer:"
170 PRINT
180 PRINT " Ref Level = 25 dBm"
190 PRINT " Span = 1 kHz"
200 PRINT " Resolution BW = 30 Hz"
210 PRINT " Video BW = 30 Hz"
220 PRINT
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66 Verification Tests Agilent E1445A Service Manual