DB Bandwidth Adjustments | HP 8568B manual

9.3 dB Bandwidth Adjustments

22.CRT MKR A annotation now indicates the 3 dB bandwidth of the

300 kHz bandwidth. 3 dB bandwidth should be 300.0 f30.0 kHz.

23.Key in @GZVBW) 10 kHz and [FREQUENCY SPAN) 20 kHz. If necessary, readjust PREFERENCE LEVEL] and [CENTER FREQUENCY), using DATA knob to place signal peak near top of graticule and centered on center graticule line.

24.Press MARKER IOFF], then MARKER [ ].

25.Using DATA knob, adjust marker down one side of the displayed signal to the 3 dB point; CRT MKR A annotation indicates .707 X.

26.Adjust A4A9R65 10 kHz for MKR A indication of 5.00 kHz while maintaining marker at 3 dB point (. 707 X) using DATA knob. See Figure 3-45 for location of adjustment.

27.Press MARKER A. Adjust marker to 3 dB point on opposite side of signal (CRT MKR A annotation indicates 1.00 X).

28.CRT MKR A annotation now indicates the 3 dB bandwidth of the 10 kHz bandwidth. 3 dB bandwidth should be 10.0 fl.O kHz.

29.Key in (&YiGBW) 3 kHz and CFREQUENCY SPAN) 5 kHz. If necessary, readjust [REFERENCELEVEL) and [CENTER FREQUENCY], using DATA knob to place signal peak near top of graticule and centered on center graticule line.

30.Press MARKER (OFF), then MARKER [nl.

31.Using DATA knob, adjust marker down one side of the displayed signal to the 3 dB point; CRT MKR A annotation indicates .707 X.

32.Adjust A4A9R66 3 kHz for MKR A indication of 1.5 kHz while maintaining marker at 3 dB point (.707 X) using DATA knob. See Figure 3-45 for location of adjustments.

33.Press MARKER [nl. Adjust marker to 3 dB point on opposite side of signal (CRT MKR A annotation indicates 1.00 X).

34.CRT MKR A annotation now indicates the 3 dB bandwidth of the 3 kHz bandwidth. 3 dB bandwidth should be 3.00 50.30 kHz.

3-86 Adjustments

Image 200

HP 8568B manual DB Bandwidth Adjustments

Contents

Performance Tests and Adjustments Manual Page Certification Warranty Assistance Safety Symbols General Safety Considerations Troubleshooting Repair Manual Section Troubleshooting Repair ManualHP 85662A IF-DisplayIF-Display Section service information HP 8568B Spectrum Analyzer Documentation Outline Contents Adjustments Crystal Filter Bypass Network Configuration IF-Display Section Figure Index RF Section Figure Index Figures Contents-5 Typical Bandpass Shift t 128 If Section, Bottom View Lhbles General Information Introduction Option 462 Instruments Option 857 Instruments HP 8340A HP 8640B HP 3335A HP 8116A HP 3312A HP 5061B Probe 10 1 Divider, compatible with oscilloscope HP 10432A Frequency Counter Electronic = Universal CounterOscilloscope Page Power Splitter Directional Bridge DB AttenuatorTermination Low-Pass Filter Test Cable BNC m to SMB Snap-On f SMA m to SMA m HP5061-5458 Figure l-l. Service Accessories, HP Part Number 08505-60109 Performance Tksts Able 2-1. Performance Test Cross-Reference Specification uncorrected Center Frequency Readout Accuracy ‘I&t Center Frequency Readout Error Measurement MHZ\I Specification Frequency Span Accuracy lkst Equipment 83640A1250-1250 5061-5458 10 Hz Sweep Time Accuracy Test Setup Sweep Time Accuracy Test 220 ms Procedure KHz 100 ms 90 ms Repeat steps 5 and 6 for each sweep time setting in Table18 ms 20 ms 50 ms 100 ms 500 ms 10 s 50 s 100 s 150 s Start-Up Time Measurement Sweep Time20 s 200 s 32 s 48 s 10 dBm Resolution Bandwidth Accuracy TestSpecification &20%, 3 MHz MHz 900 kHz 100 MHz 90.0 kHz 110.0 kHz00 kHz 11.00 kHz KHz 200 kHzPage DB Bandwidth Measurement 6OdB MHz 20 MHz 100 Hz 15l 15 MHz 300 Hz 300 kHz100 kHz MHz 30 kHz 500 kHz Resolution Bandwidth Switching Uncertainty Test Procedure 1. PressDBm Press LOG Enter dB/bIvj and key in 1 dB. Press Marker IlIl.00 Zto.50 Ito F0.50 DZo.50 F0.80 F2.00 Page Fl dB +lO Fl dB Specification Signal Input Related Adjustment Slope Compensation AdjustmentFrequency Response Test ~tl.5 dB, 100 Hz to 1.5 GHz DB, 100 Hz to 500 MHz Additional Equipment for Option 100Synthesized Sweeper 120 s 5GHz 12. Frequency Response Measurement 20 MHz to 1.5 GHz Option 001 + 4 dBm Page KHz to 20 MHz MaximumdBm MinimumdBm 100 kHz Set function generator controls as follows Hz to 1.5 GHz from steps 15, 16, 25, 42, or Spec ~3 dB Overall Maximum DBm Minimum DeviationPage 16. RF Gain Uncertainty Measurement If Gain Uncertainty Test DBm to -55.9 dBm DBm to -129.9 dBm Procedure 1. Press Instr pfwm LOG 18. if Gain Uncertainty Measurement 19. if Gain Uncertainty Measurement 2 dB Largest Positive Deviation Negative Amplitude Page Log Scale Switching Uncertainty Test F0.5 Related Adjustment AmplitudeFidelity Test For instruments with Option 857, refer to Chapter +lO ~f1.5 dB Linear Fidelity 10. Key in analyzer settings as follows JEGi 300 Hz 10.87 23.10 17.72 Average Noise Level Tkst 501 HZ80 dBm 1Hz 23. Average Noise Level Measurement 60 dBm Procedure 1. Press Instr PresetResidual Responses Test Option Spurious Responses Test Synthesized Frequency3335A Ii 84&A Opt Performance Tests 2 26. Intermodulation Distortion Test Setup Intermodulation Distortion 211 2f2 Fl fz Center Frequency 1 MHZ, Marker Peak Search to position Spurious Responses Test Residual FM Test Hr RF -I... L 1u 29. Slope Detected Residual FM Performance Tests 2 Specification Description Equipment Procedure Line-Related Sidebands Tests10 dBm Wait for completion of sweep, then press Marker Wait for completion of the sweep, then press Marker 20 MHzDBm 32. Calibrator Amplitude Accuracy Test Setup Calibrator Amplitude Accuracy Test Related Adjustment None UniversalHP 5316A HP 8340A Triangular wave Approximately 1 Vp-pCAL position SYM CAL position F0.02 F0.05 10.0 fO.1 200 50.0 Iko.5 100 100 fl St LO Output Amplitude Test Related Adjustment Time Base Adjustment Frequency Reference Error TestSpecification Aging Rate Page ‘lhble 2-19. Performance Tkst Record Tkst 1. Center Frequency Readout Accuracy Test Steps 7, 9, and 11. Wide Span Error Span Error 1Freq Span Spec ADUT- ASyn Min Max From ‘able‘I&t 2. Frequency Span Accuracy Test Test 2. Frequency Span Accuracy Test Test 3. Sweep Time Accuracy Sweep Time Accuracy, Sweep Times 220 ms Marker a TimeMin Measured Max Min Measured Marker a Readout of 3 d 3 Bandwidth Min Measured Max ‘I&t 4. Resolution Bandwidth AccuracyTest 4. Resolution Bandwidth Accuracy Test 5. Resolution Bandwidth Selectivity Videobw 6 0 dBBandwidth 60dB BW t DB BW MHz 20 MHz 100 Hz 15l 1MHz 15MHz Test 6. Resolution Bandwidth Switching Uncertainty Test Bandwidth Switching UncertaintyDeviation Readout, dB Allowable Deviation Test 7. Input Attenuator Switching Uncertainty Test Input Attenuator Switching Uncertainty+lO Deviation Amplitude Ztl dB Kl dB Fl dB Test 8. Frequency Response Test Kep Signal InputTest 8. Frequency Respons g + 1.0 dB Test 9. RF Gain Uncertainty TestNd LO Shift Min Measured Max Test 10. if Gain Uncertainty Test F E R E N C E Level Steps 25 to 28. if Gain Uncertainty SteuI Min Measured Max StepStep HO.5 YLkst 11. Log Scale Switching Uncertainty TkstXto.5 Test 12. Amplitude Fidelity ‘I&t Test 12. Amplitude Fidelity TestLinear Amplitude Fidelity Frequency Allowable Range Test 13. Average Noise Level Test Test 14. Residual Responses Test Test 14. Residual Responses TestMaximum Residual Response Frequency Range Measured Measured Max Max Amplitude Frequency DBm -105 dBm -100 dBm 90 dBm Tkst 15. Spurious Responses TkstDescription Residual FM IMinIMeasuredIrax Test 16. Residual FM TestTest 16. Residual FM Test Tkst Line-Related Sidebands Test Min 1 M e a s u r e d M a x Test 18. Calibrator Amplitude Accuracy ‘I&t Test 18. Calibrator Amplitude Accuracy TestCAL Output Amplitude Min 10.3 dBm 70 dBm KO.02 Iko.05 10.0 fO.1 200 ps 50.0 f0.5 100 ps 100 fl Test 19. FastSweep Time Accuracy Test ~20 Test 20 st LO Output Amplitude Test Test 20 st LO Output Amplitude Test St LO Output Level Test 21. Frequency Reference Error DescriDtion Min 1 Measured Max Video Processor Adjustments MHz Bandwidth Filter Adjustments Slope Compensation Adjustment Equipment Required Adjustment Tools Safety Considerations Factory-Selected Components Location of lkst Points and Adjustments Related Adjustments ‘Ihble 3-2. Adjustable Components Adjustment Adjustment Function Number ‘able 3-2. Adjustable Components Reference Designator Adjustment NameAdjustment Number Adjustment Function SGlO Adjustable Components Reference Adjustment Designator Name Adjusts Linearity 12.5 to 18.6 GHz Low end A6AlOR37 Adjusts Linearity 12.5 to 18.6 GHz High end A6AlOR40Adjusts linearity 5.8 to 12.5 GHz A6AlOR41 Adjusts linearity 12.5 to 18.6 GHz Low end A6AlOR42 ‘Ihble 3-2. Adjustable Components Reference Designator Adjustment Name Number If Serial Prefix 3001A and Below If Serial Prefix 2637A and Below Function of Component Range of Values Function of Component Procedure Or PF ’hble 3-3. Factory-Selected Components Adjustment Range of Values Procedure 0 or PF To 17.8 K To 13.3 K 10 38.3 to 100 to 383 to To 2.61 K ?or Serial Prefix 2813A To 2816A, and Serial Prefix 2810A Below, see the back This table for exceptions to A4A9 Delay Compensation A6A12C2 To 0.68 PF Sets Delay Compensation A6A12C3Delay Compensation A6A 12C23 To 0.68 PF Sets Not loaded for HP 85660B A6A12Cll To 0.68 PF Sets Serial Prefix 2813A to 2816A Serial Prefix 2810A and Below Option ‘lkble 3-4. Standard Value Replacement Capacitors Value pF 1BP Fart Number CD Value pF ZP Fart Number s ‘lhble Standard Value Replacement 0.125 Resistors Value n EP Fart Number0698-3447 0698-0082 ‘Ihble Standard Value Replacement 0.125 Resistors ValueBP Part Number Value !I ElP Fart Number Value 0 EIP Fart Number 383 422 464 Standard Value Replacement 0.5 ResistorsValue fl BP Part Number 10.0 11.0 12.1 Ihble Standard Value Replacement 0.5 Resistors 110K 121K 133K 147KEIP Fart Number Value a Low-Voltage Power Supply Adjustments Procedure IF-Display SectionLow-Voltage Power Supply Adjustments Reference IF-Display Section Low-Voltage Adjustments SN 3001A Below IF-Display Section Low-Voltage Adjustments SN 3004A Above Location of RF Section Low-Voltage Adjustments RF Section Low-Voltage Power Supply Adjustments Description High-Voltage Adjustment SN 3001A and BelowHigh-Voltage Adjustment SN 3001A and Below High-Voltage Adjustment Procedure High Voltage Adjustment Setup Location of High Voltage Adjustments Level of approximately -4000 V dc. Be extremely careful LevelRemove the protective cover from the AlA High-Voltage Press Display Focus and Intensity AdjustmentsPress @%KiZi@ Location of AlA Components CRT Cut-Off Voltage 10. Waveform at AlA3TP5 Be careful Discharge Procedure for High VoltageFollowing step, a large arc of high voltage should be drawn 1. Discharging the CRT Post-Accelerator Cable High-Voltage Adjustment SN 3004A and Above High-Voltage Adjustment SN 3004A and Above 12. High Voltage Adjustment Setup Approximately -2400 V dc can present even when the ac line Level 14. Location of AlA Label and Test Point Remove the ac line cord from both instrument sections 15. Discharging the CRT Post-Accelerator Cable Adapters Preliminary Display Adjustments SN 3001A and BelowPreliminary Display Adjustments SN 3001A and Below Procedure Y Deflection Amplifier Pulse Response Adjustments 16. Preliminary Display Adjustments Setup ~000uu000000u00ur 17. Location of AlA2, AlA4, AlA5, and A3A2Page Rise and Fall Times and Overshoot Adjustment Waveform 20. Composite X Deflection Waveform Press Itrig Level .00000 V c Pulse Response of Control Gate Z Amplifier to Blank InputPress TlMEBASEI 22 OV,, Signal Set the oscilloscope controls as follows Press @iK Preliminary Display Adjustments SN 3004A and Above Preliminary Display Adjustments SN 3004A and Above 23. Preliminary Display Adjustments Setup 24. Location of AlA and A3A2 Delay 125.000 ns Press Display Set the oscilloscope controls as follows Press ChanOffset Press Trig Source Level 25.0000 Press Time 27. Composite X Deflection Waveform Amplifier to Control Gate Z 29 OV,., Signal ‘Ihble 3-5. Initial Adjustment Positions Description ProcedureFinal Display Adjustments SN 3001A and Below Location of Final Display Adjustments on AlA2, AlA4, and AlA Final Display Adjustments SN 3004A and Above 31. Final Display Adjustments Setup RI20R220R512R513 R319 R426 R437 Adjustments 3 Final Display Adjustments SN 3004A and Above Related Performance Tests Equipment ProcedureLog Amplifier Adjustments Offset Adjustment Check VTV and Atten Adjustments Linear Gain Adjustments Log Amplifier Adjustments Related Performance Test Video Processor AdjustmentsVideo Processor Adjustments LOG Offset Adjust Set step attenuator to 40 dB Adjustments 3-7 MHz Bandwidth Filter Adjustments 37 MHz Bandwidth Filter Adjustments Setup MHz Bandwidth Filter Adjustments Filter Center and Symmetry AdjustmentsFrequency Zero Check Remove crystal filter bypass network near Cl4 SYM Filter Peak Adjust Key in Csweep Time 20 ms, Frequency Span 0 Hz, CREs 10 Hz 39. Location of 3 MHz Peak Adjustments MHz Bandwidth Filter Adjustments Hz Amplitude Adjustments 40 .4 MHz Bandwidth Filter Adjustments Setup Location of A4A4 21.4 MHz LC Filter Adjustments + 10 V Temperature Compensation Supply CheckA4A4 LC Adjustments Press Marker loFF. Key in CREsJ 30 kHz A4A4 Xtal AdjustmentsLocation of A4A4 21.4 MHz Crystal Filter Adjustments A4A8 LC Adjustments A4A8 Xtal Adjustments Location of A4A8 21.4 MHz Crystal Filter AdjustmentsKey in t-1 100 kHz, C-1 200 kHz, and Marker Key in @TFTiTj 30 kHz, Frequency Span 100 kHz. Press LC Dip Adjustments AlOdB and A20dB Adjustments DB Bandwidth Adjustments DB Bandwidth Adjustments 45. Location of 3 dB Bandwidth Adjustments DB Bandwidth Adjustments Step Gain and 18.4 MHz Local Oscillator Adjustments Setup Step Gain and 18.4 MHz Local Oscillator AdjustmentsStep Gain and 18.4 MHz Local Oscillator Adjustments If Gain Adjustment 47. Location of if Gain Adjustment DB Gain Step Adjustment 48. Location of 10 dB Gain Step Adjustments MHz Local Oscillator Adjustment + 1OV Temperature Compensation Supply Adjustment Key in Frequency Span 1kHz, REs 100 Hz, Converter Adjustments Down/Up Down/Up Converter Adjustments Optional Down Converter Gain Adjustment 52. Time Base Adjustment Setup Cables Procedure Note Set the Frequency Counter controls as follows 53. Location of A27Al Adjustment Time Base Adjustment SN 2848A to 3217A05567 Time Base Adjustment SN 2848A to 3217A05567 X10 Math SELECT/ENTER Cm 10 I-1 6 SELECT/E~&ER 55. Location of A27A2 Adjustment Reference Adjustments MHz Reference Adjustments13 MHz Type N m to BNC f Type N f to BNC f 57. Location of 20 MHz Reference Adjustments Delay 40ns 1V / divOffset Coupling 1Ol 58. Typical Signal at A16TP3 Press &K?@ Press CnTavj MHz Phase Lock Oscillator Adjustments MHz Phase Lock Oscillator AdjustmentsReference Description Type N m to BNC f Location of 249 MHz Phase Lock Oscillator Adjustments Single Page MHz Phase Lock Oscillator Adjustment Disconnect test equipment from instrument Second if Amplifier and Third Converter Adjustment 63. Second if Amplifier Adjustments Setup BNC to SMB Snap-On Service Accessory 2 required Second if Amplifier AdjustmentsSecond if Amplifier and Third Converter Adjustment Adapters Second if Amplifier and Third Converter Adjustment Third Converter Adjustment 66. Minimum Image Response at 258.4 MHz 1250-1745 1250-0780 1250-1474 1250-1749 Pilot Second if Amplif’ier AdjustmentsType N m to BNC f 2 required Type N f to BNC f 2 required Pilot Second if Amplifier Adjustments Location of 269 MHz Bandpass Filter Adjustments MHz Bandpass Filter Adjustments Waveforms HP 3456A Frequency Control AdjustmentsFrequency Control Adjustments Slow Sweep Adjustment Start-Up Time Full Sweep Adjustment YTO and VT0 DAC Adjustments Start and Stop Adjustments Key in ml CF Step Size J 1023 Hz Second Converter Adjustments Second Converter AdjustmentsReference Related Performance S t Second LO Frequency and Shift Adjustments Set HP 8568B Spectrum Analyzer Line to on and press Second Converter Adjustments Second Converter Bandpass Filter Adjustments 74. Typical Pilot 2ND if Bandpass Shift t 1i i i i ii i Second Converter Final Adjustments Voltage-Tuned Oscillator Adjustments 78 MHz Voltage-Tuned Oscillator Adjustments Setup Connect DVM to AllTPl located on All cover Dacs Accuracy Check Positive Supply AdjustmentMHz Voltage-Tuned Oscillator Adjustments VT0 Center-Frequency Checks SMA m m Slope Compensation AdjustmentsSlope Compensation Adjustments Leveling EXT Input 81. Location of A22R66 Tiiit Adjustment Comb Generator Adjustments 83. Location of Comb Generator Adjustments Comb Generator Adjustments 84. Comb Teeth Display Comb Generator Adjustments Analog-To-Digital Converter Adjustments 85. Analog-To-Digital Converter Adjustments Setup Location of Analog-To-Digital Converter Adjustments Press Qnstr Preset Procedure EquipmentDigital Voltmeter DVM Place instrument upright as shown in -87 with top and A3 Track and Hold Adjustments 88. Location of Track and Hold Adjustments Track and Hold Adjustments Digital Storage Display Adjustments Reference Description Equipment ProcedurePreliminary Graticule Adjustments Digital Storage Display Adjustments 90. Location of Digital Storage Display Adjustments Sample and Hold Balance Adjustments 91. Sample and Hold Balance Adjustment Waveforms Y Offset and 25. Gain Adjustments Final Graticule Adjustments Y Expand Adjustments Low-Noise DC SUPPlY Crystal Filter Bypass Network Configuration Crystal Filter Bypass Network Configuration Option Impulse Bandwidths Related Adjustment Specification DB Resolution Bandwidth Accuracy TestDescription Equipment Procedure Page Impulse and Resolution Bandwidth Accuracy Test Page Impulse and Resolution Bandwidth Accuracy Test Page 100 kHz MHz 30 kHz 10 kHz 100 kHz KHz900 kHz MHz 90 kHz 110 kHz 1Frequency MHz 300 kHzKHz 300 Hz 100 Hz 150 Hz 30 Hz DB Resolution Bandwidth Selectivity Test Press DB Bandwidth Measurement MHz 20 MHz 100 Hz 11l 15 MHz 300 Hz 300 kHz VlDEoj60 dB Page Impulse and Resolution Bandwidth Selectivity Test Selectivity Frequency ‘EG Bandwidth DB BW Ratio Span Procedure 1. Press ~NSTR Preset Press LOG Enter dB/otv and key in 1 dB. Press Marker LdB’ t-H+ MHz 500 kHz 50 kHz 10 kHz KHz KHz 200 Hz 100 Hz ‘RES Steps 1 through 38. Impulse Bandwidth Accuracy Option MHz 20 MHz 100 Hz 11l 15 MHz 300 Hz 111 300 kHz MHz 100 Hz 11l 300 Hz 300 kHz Ref. xt 1.0 It Zt 0.5 xt F 0.5 f 0.5 f 0.5 f 0.8 f DB Resolution Bandwidth Adjustments Test Location of Bandwidth Adjustments DB Resolution Bandwidth Adjustments Impulse Bandwidth Adjustments C O N T R O L Key in @E’GZT 3 kHz, Frequency Span 5 kHz, Peak SEARCH, Introduction Specification Log Related Adjustment Log Amplifier Adjustments Option 857 Amplitude Fidelity Test + 10 dBm Frequency Sk1.0 dB %1.5 dB Marker a Performance Test Record Test 12. Option Amplitude Fidelity Test DB sf1.5 dB Min Max 6-5 6-5 6-6 RF Section Figure Index Major Assembly and Component locations RF Section, Top View RF Section, Front View RF Section, Bottom View \.\ \ I ‘i If Section, Top View SN 3004A and Above If Section, Front View W2g