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Фрагмент инструкции
Adjust your Spectrum Analyzer as necessary. 1. Reset the AFG: *RST ;*CLS Reset AFG and clear status registers 2. Set the AFG to output a -5 dBm, 10 MHz sinewave with the 10 MHz filter enabled: FREQ 1.0E7; Set AFG frequency :VOLT -5DBM Set AFG amplitude OUTP:FILT:FREQ 10 MHZ Set filter to 10MHz OUTP:FILT ON Enable filter INIT:IMM Initiate waveform Agilent E1445A Service Manual Verification Tests 69 Test 2-10: Spurious/Non-Harmonic Distortion (cont’d) Test Procedure (cont’d) Perform steps 3 and 4 for each frequency range listed in Table 2-10: 3. Set the Spectrum Analyzer start frequency and stop frequency to the values listed in Table 2-10. 4. Measure the amplitude (in dBm) of the highest peak. Subtract the amplitude of the fundamental (-5dBm) from the reading and record the result in Table 2-11: result (dBc) = reading (dBm) - (-5 dBm) Table 2-10. Spurious/Non-Harmonic Test Points Start Frequency (Hz) Stop Frequency (Hz) Test Limits (dBc) 100 E3 9.5 E6 -45 10.5 E6 19 E6 -45 21 E6 29 E6 -45 31 E6 39 E6 -45 41 E6 49 E6 -45 51 E6 75 E6 -45 75 E6 100 E6 -45 100 E6 125 E6 -45 125 E6 150 E6 -45 70 Verification Tests Agilent E1445A Service Manual Test 2-10: Spurious/Non-Harmonic Distortion (cont’d) Example Program This program performs the Spurious/Non-harmonic Test. 10 ! 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 RE-STORE "NON_HARM" DIM Start_freq(1:9),Stop_freq(1:9),Max_ampl(1:9) ! !----------Set up I/O path and reset AFG---------- ASSIGN @Afg TO 70910 OUTPUT @Afg;"*RST;*CLS" ! !----------Initialize variables — Freq_out=1.0E+7 Dbm out$="-5DBM" !AFG I/O path !Reset AFG !Freq = 10 MHz !Amplitude = -5dBm DATA 100E3,10.5E6,21E6,31 E6,41E6,51 E6,75E6,100E6,125E6 READ Start_freq(*) !Read start freqs ! DATA 9.5E6,19E6,29E6,39E6,49E6,75E6,100E6,125E6,150E6 READ Stop_freq(*) !Read stop freqs !----------Set up Spec Analyzer---------- CLEAR SCREEN PRINT "Set up Spectrum Analyzer:" PRINT PRINT " Ref Level = -5dBm" PRINT " Resolution BW = 3 kHz" PRINT " Video BW = 3 kHz" PRINT PRINT "Connect Spectrum Analyzer to AFG Output." DISP "Press 'Continue' when ready" PAUSE CLEAR SCREEN !----------Set up AFG ---- OUTPUT @Afg;"*RST" WAIT 1 OUTPUT @Afg OUTPUT @Afg OUTPUT @Afg OUTPUT @Afg OUTPUT @Afg "FREQ "&VAL$(Freq_out)&";"; ":VOLT "&Dbm_out$ "OUTP:FILT:FREQ 10MHZ" "OUTP:FILT ON" "INIT:IMM" !Reset AFG !Set frequency !Set amplitude !Enable 10MHz filter !Initiate (Continued on next page) Agilent E1445A Service Manual Verification Tests 71 Test 2-10: Spurious/Non-Harmonic Distortion (cont’d) Example Program (cont’d) 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 !----------Perform test---------- FOR I=1 TO 9 CLEAR SCREEN PRINT "Set Spectrum Analyzer Start Freq to: ";Start_freq(I);"Hz" PRINT "Set Spectrum Analyzer Stop Freq to: ";Stop_freq(I);"Hz" PRINT "Measure the amplitude of the highest peak." PRINT INPUT "Enter amplitude (in dBm):",Peak_ampl PRINT "Result =";VAL(Dbm_out$)-Peak_ampl;"dBc" !Calculate result in dBc DISP "Press 'Continue' when ready" PAUSE DISP NEXT I OUTPUT @Afg;"*RST;*CLS" END !Reset AFG 72 Verification Tests Agilent E1445A Service Manual Table 2-11, Performance Test Record for the Agilent E1445A AFG, is a form you can copy and use to record performance verification test results for the AFG. Table 2-11 shows AFG accuracy, measurement uncertainty, and test accuracy ratio (TAR) values. Test limits are defined using the specifications in Appendix A of the Agilent E1445A User’s Manual. The specifications for Total Harmonic Distortion and Spurious/Non-harmonic Distortion are single-sided (i.e., there is an upper limit but no lower limit). In the Performance Test Record, the Minimum column will be blank. For the performance verification tests in this manual, the measurement uncertainties are based on the accuracy specifications for the following test equipment: Performance Test Test Equipment 1. DC Zeros Agilent 3458A 2. DC Accuracy Agilent 3458A 3. DC Offset Agilent 3458A 4. AC Accuracy Agilent 3458A 5. AC Flatness (250 kHz filter) Agilent 3458A 6. AC Flatness (10 MHz filter)* Agilent 3458A Agilent 8902A 7. Frequency Accuracy Agilent 5334B 8. Duty Cycle Agilent 5334B 9. Total Harmonic Distortion Agilent 8566B 10. Spurious/Non-harmonic Distortion Agilent 8566B * Includes following uncertainties: 8902A Range linearity, 11722A Power Sensor Cal Factor uncertainty, 3458A accuracy at 100 kHz. Performance Test Record AFG Test Limits Measurement Uncertainty Agilent E1445A Service Manual Verification Tests 73 Test Accuracy Ratio (TAR) Test Accuracy Ratio (TAR) for the E1445A is defined as: AFG Accuracy/Measurement Uncertainty, i.e., Tar _ Maximum - Expected Reading _ Measurement Uncertainty For single-sided measurements, Test Accuracy Ratio is not defined, so ’NA’ (Not Applicable) will appear in ...
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