DB Bandwidth Adjustments | HP 8568B guide

9. 3 dB Bandwidth Adjustments

A4A9

IF CONTROL

\

A4A3

Figure 3-45. Location of 3 dB Bandwidth Adjustments

9.Press MARKER a. Adjust marker to 3 dB point on opposite side of signal (CRT MKR A annotation indicates 1.00 X). There are now two markers; one on each side of the signal at the 3 dB points.

10.CRT MKR A annotation now indicates the 3 dB bandwidth of the 3 MHz bandwidth. 3 dB bandwidth should be 3.00 &to.60 MHz.

11.Key in @YWBW) 1 MHz and [FREQUENCY SPAN] 2 MHz. If necessary, readjust [REFERENCELEVEL)~CENTERand FREQUENCY), using DATA knob to place signal peak near top of graticule and centered on center graticule line.

12.Press MARKER [OFF), then MARKER @].

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

14.Adjust A4A9R61 1 MHz for MKR A indication of 500 kHz while maintaining marker at 3 dB point (.707 X) using DATA knob. See Figure 3-45 for location of adjustment.

15.Press MARKER a. Adjust marker to 3 dB point on opposite side of signal (CRT MKR A annotation indicates 1.00 X). There are now two markers; one on each side of the signal at the 3 dB point.

16.CRT MKR A annotation now indicates the 3 dB bandwidth of the 1 MHz bandwidth. 3 dB bandwidth should be 1.00 fO.10 MHz.

17.Key in @G?G-BW) 300 kHz and CFREQUENCY SPAN) 500 kHz. If necessary, readjust CREFERENCE LEVEL) and [CENTER FREQUENCY], using DATA knob to place signal peak near top of graticule and centered on center graticule line.

18.Press MARKER (OFF), then MARKER @J.

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

20.Adjust A4A9R62 300 kHz for MKR A indication of 150 kHz while maintaining marker at 3 dB point (.707 X) using DATA knob. See Figure 3-45 for location of adjustment.

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

Adjustments 3-85

Image 199

HP 8568B manual DB Bandwidth Adjustments, Location of 3 dB Bandwidth Adjustments

Contents

Performance Tests and Adjustments Manual Page Certification Warranty Assistance General Safety Considerations Safety Symbols HP 8568B Spectrum Analyzer Documentation Outline Troubleshooting Repair ManualSection Troubleshooting Repair Manual HP 85662A IF-DisplayIF-Display Section service information Contents Adjustments IF-Display Section Figure Index RF Section Figure Index Crystal Filter Bypass Network Configuration Figures Contents-5 Typical Bandpass Shift t 128 If Section, Bottom View Lhbles Introduction General Information Option 462 Instruments Option 857 Instruments HP 8340A HP 8640B HP 3335A HP 8116A HP 3312A HP 5061B Oscilloscope Frequency Counter Electronic = Universal CounterProbe 10 1 Divider, compatible with oscilloscope HP 10432A Page Low-Pass Filter Power Splitter Directional BridgeDB Attenuator Termination Test Cable BNC m to SMB Snap-On f SMA m to SMA m HP5061-5458 08505-60109 Figure l-l. Service Accessories, HP Part Number Performance Tksts Able 2-1. Performance Test Cross-Reference Center Frequency Readout Accuracy ‘I&t Specification uncorrected Center Frequency Readout Error Measurement MHZ\I Frequency Span Accuracy lkst Specification 5061-5458 Equipment83640A 1250-1250 10 Hz Sweep Time Accuracy Test 220 ms Sweep Time Accuracy Test Setup KHz Procedure 18 ms Repeat steps 5 and 6 for each sweep time setting in Table100 ms 90 ms 20 s 200 s 32 s 48 s Start-Up Time Measurement Sweep Time20 ms 50 ms 100 ms 500 ms 10 s 50 s 100 s 150 s Specification &20%, 3 MHz Resolution Bandwidth Accuracy Test10 dBm 200 kHz MHz 900 kHz 100 MHz90.0 kHz 110.0 kHz 00 kHz 11.00 kHz KHzPage DB Bandwidth Measurement 30 kHz 500 kHz 6OdBMHz 20 MHz 100 Hz 15l 15 MHz 300 Hz 300 kHz 100 kHz MHz Press LOG Enter dB/bIvj and key in 1 dB. Press Marker Resolution Bandwidth Switching Uncertainty TestProcedure 1. Press DBm IlIl.00 Zto.50 Ito F0.50 DZo.50 F0.80 F2.00 Page +lO Fl dB Fl dB ~tl.5 dB, 100 Hz to 1.5 GHz DB, 100 Hz to 500 MHz Specification Signal InputRelated Adjustment Slope Compensation Adjustment Frequency Response Test 120 s Additional Equipment for Option100 Synthesized Sweeper 12. Frequency Response Measurement 20 MHz to 1.5 GHz 5GHz Option 001 + 4 dBm Page KHz to 20 MHz MaximumdBm MinimumdBm 100 kHz Set function generator controls as follows Spec ~3 dB Overall Maximum DBm Minimum Deviation Hz to 1.5 GHz from steps 15, 16, 25, 42, orPage 16. RF Gain Uncertainty Measurement DBm to -55.9 dBm DBm to -129.9 dBm If Gain Uncertainty Test LOG Procedure 1. Press Instr pfwm 18. if Gain Uncertainty Measurement 19. if Gain Uncertainty Measurement 2 dB Largest Positive Deviation Negative Amplitude Page F0.5 Log Scale Switching Uncertainty Test For instruments with Option 857, refer to Chapter Related AdjustmentAmplitude Fidelity Test +lO ~f1.5 dB JEGi 300 Hz Linear Fidelity 10. Key in analyzer settings as follows 10.87 23.10 17.72 1Hz Average Noise Level Tkst501 HZ 80 dBm 23. Average Noise Level Measurement Residual Responses Test Procedure 1. Press Instr Preset60 dBm Option Spurious Responses Test Ii 84&A Opt SynthesizedFrequency 3335A Performance Tests 2 Intermodulation Distortion 26. Intermodulation Distortion Test Setup Fl fz 211 2f2 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 Wait for completion of sweep, then press Marker Specification Description Equipment ProcedureLine-Related Sidebands Tests 10 dBm DBm 20 MHzWait for completion of the sweep, then press Marker Calibrator Amplitude Accuracy Test 32. Calibrator Amplitude Accuracy Test Setup HP 8340A Related Adjustment NoneUniversal HP 5316A SYM CAL position Triangular waveApproximately 1 Vp-p CAL position F0.02 F0.05 10.0 fO.1 200 50.0 Iko.5 100 100 fl St LO Output Amplitude Test Specification Aging Rate Frequency Reference Error TestRelated Adjustment Time Base Adjustment Page ‘lhble 2-19. Performance Tkst Record Tkst 1. Center Frequency Readout Accuracy Test Test 2. Frequency Span Accuracy Test Steps 7, 9, and 11. Wide Span ErrorSpan Error 1Freq Span Spec ADUT- ASyn Min Max From ‘able ‘I&t 2. Frequency Span Accuracy Test Min Measured Test 3. Sweep Time AccuracySweep Time Accuracy, Sweep Times 220 ms Marker a Time Min Measured Max Test 4. Resolution Bandwidth Accuracy ‘I&t 4. Resolution Bandwidth AccuracyMarker a Readout of 3 d 3 Bandwidth Min Measured Max MHz 20 MHz 100 Hz 15l 1MHz 15MHz Test 5. Resolution Bandwidth SelectivityVideobw 6 0 dB Bandwidth 60dB BW t DB BW Readout, dB Allowable Deviation Test 6. Resolution Bandwidth Switching Uncertainty TestBandwidth Switching Uncertainty Deviation Deviation Amplitude Ztl dB Kl dB Fl dB Test 7. Input Attenuator Switching Uncertainty TestInput Attenuator Switching Uncertainty +lO Test 8. Frequency Respons g Kep Signal InputTest 8. Frequency Response Test Nd LO Shift Min Measured Max Test 9. RF Gain Uncertainty Test+ 1.0 dB Test 10. if Gain Uncertainty Test F E R E N C E Level Step StepSteps 25 to 28. if Gain Uncertainty SteuI Min Measured Max Xto.5 YLkst 11. Log Scale Switching Uncertainty TkstHO.5 Allowable Range Test 12. Amplitude Fidelity ‘I&tTest 12. Amplitude Fidelity Test Linear Amplitude Fidelity Frequency Test 13. Average Noise Level Test Measured Measured Max Max Amplitude Frequency Test 14. Residual Responses TestTest 14. Residual Responses Test Maximum Residual Response Frequency Range Description Tkst 15. Spurious Responses TkstDBm -105 dBm -100 dBm 90 dBm Test 16. Residual FM Test Test 16. Residual FM TestResidual FM IMinIMeasuredIrax Min 1 M e a s u r e d M a x Tkst Line-Related Sidebands Test 10.3 dBm 70 dBm Test 18. Calibrator Amplitude Accuracy ‘I&tTest 18. Calibrator Amplitude Accuracy Test CAL Output Amplitude Min Sweep Time Accuracy Test ~20 Test 19. FastKO.02 Iko.05 10.0 fO.1 200 ps 50.0 f0.5 100 ps 100 fl Test 20 st LO Output Amplitude Test St LO Output Level Test 20 st LO Output Amplitude Test DescriDtion Min 1 Measured Max Test 21. Frequency Reference Error Slope Compensation Adjustment Video Processor Adjustments MHz Bandwidth Filter Adjustments Safety Considerations Equipment Required Adjustment Tools Factory-Selected Components Related Adjustments Location of lkst Points and Adjustments ‘Ihble 3-2. Adjustable Components Adjustment Adjustment Function Number SGlO ‘able 3-2. Adjustable Components Reference DesignatorAdjustment Name Adjustment Number Adjustment Function Adjustable Components Reference Adjustment Designator Name Adjusts linearity 12.5 to 18.6 GHz Low end A6AlOR42 Adjusts Linearity 12.5 to 18.6 GHz Low end A6AlOR37Adjusts Linearity 12.5 to 18.6 GHz High end A6AlOR40 Adjusts linearity 5.8 to 12.5 GHz A6AlOR41 Adjustment Name Number ‘Ihble 3-2. Adjustable Components Reference Designator If Serial Prefix 3001A and Below If Serial Prefix 2637A and Below Function of Component ’hble 3-3. Factory-Selected Components Range of Values Function of Component Procedure Or PF To 17.8 K To 13.3 K 10 38.3 to 100 to 383 to To 2.61 K Adjustment Range of Values Procedure 0 or PF Below, see the back This table for exceptions to A4A9 ?or Serial Prefix 2813A To 2816A, and Serial Prefix 2810A Not loaded for HP 85660B A6A12Cll To 0.68 PF Sets Delay Compensation A6A12C2 To 0.68 PF SetsDelay Compensation A6A12C3 Delay Compensation A6A 12C23 To 0.68 PF Sets Serial Prefix 2810A and Below Serial Prefix 2813A to 2816A Option Value pF 1BP Fart Number CD Value pF ZP Fart Number s ‘lkble 3-4. Standard Value Replacement Capacitors 0698-0082 ‘lhble Standard Value Replacement 0.125 ResistorsValue n EP Fart Number 0698-3447 Value !I ElP Fart Number ‘Ihble Standard Value Replacement 0.125 ResistorsValue BP Part Number Value fl BP Part Number 10.0 11.0 12.1 Standard Value Replacement 0.5 ResistorsValue 0 EIP Fart Number 383 422 464 Value a Ihble Standard Value Replacement 0.5 Resistors110K 121K 133K 147K EIP Fart Number Reference Low-Voltage Power Supply AdjustmentsProcedure IF-Display Section Low-Voltage Power Supply Adjustments IF-Display Section Low-Voltage Adjustments SN 3004A Above IF-Display Section Low-Voltage Adjustments SN 3001A Below RF Section Location of RF Section Low-Voltage Adjustments Low-Voltage Power Supply Adjustments High-Voltage Adjustment SN 3001A and Below High-Voltage Adjustment SN 3001A and BelowDescription High Voltage Adjustment Setup High-Voltage Adjustment Procedure Location of High Voltage Adjustments Remove the protective cover from the AlA High-Voltage LevelLevel of approximately -4000 V dc. Be extremely careful Press @%KiZi@ Focus and Intensity AdjustmentsPress Display Location of AlA Components CRT Cut-Off Voltage 10. Waveform at AlA3TP5 Following step, a large arc of high voltage should be drawn Discharge Procedure for High VoltageBe careful 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 Level Approximately -2400 V dc can present even when the ac line 14. Location of AlA Label and Test Point Remove the ac line cord from both instrument sections 15. Discharging the CRT Post-Accelerator Cable Preliminary Display Adjustments SN 3001A and Below Preliminary Display Adjustments SN 3001A and BelowAdapters 16. Preliminary Display Adjustments Setup Procedure Y Deflection Amplifier Pulse Response Adjustments 17. Location of AlA2, AlA4, AlA5, and A3A2 ~000uu000000u00urPage 20. Composite X Deflection Waveform Rise and Fall Times and Overshoot Adjustment Waveform Press TlMEBASEI Pulse Response of Control Gate Z Amplifier to Blank InputPress Itrig Level .00000 V c Set the oscilloscope controls as follows Press @iK 22 OV,, Signal Preliminary Display Adjustments SN 3004A and Above 23. Preliminary Display Adjustments Setup Preliminary Display Adjustments SN 3004A and Above 24. Location of AlA and A3A2 Press Trig Source Level 25.0000 Press Time Delay 125.000 ns Press DisplaySet the oscilloscope controls as follows Press Chan Offset 27. Composite X Deflection Waveform Control Gate Z Amplifier to 29 OV,., Signal Final Display Adjustments SN 3001A and Below Description Procedure‘Ihble 3-5. Initial Adjustment Positions Location of Final Display Adjustments on AlA2, AlA4, and AlA 31. Final Display Adjustments Setup Final Display Adjustments SN 3004A and Above RI20R220R512R513 R319 R426 R437 Adjustments 3 Final Display Adjustments SN 3004A and Above Log Amplifier Adjustments Equipment ProcedureRelated Performance Tests Offset Adjustment Check Linear Gain Adjustments VTV and Atten Adjustments Log Amplifier Adjustments Video Processor Adjustments Video Processor AdjustmentsRelated Performance Test Set step attenuator to 40 dB LOG Offset Adjust Adjustments 3-7 37 MHz Bandwidth Filter Adjustments Setup MHz Bandwidth Filter Adjustments Remove crystal filter bypass network near Cl4 SYM MHz Bandwidth Filter AdjustmentsFilter Center and Symmetry Adjustments Frequency Zero Check Key in Csweep Time 20 ms, Frequency Span 0 Hz, CREs 10 Hz Filter Peak Adjust 39. Location of 3 MHz Peak Adjustments MHz Bandwidth Filter Adjustments Hz Amplitude Adjustments 40 .4 MHz Bandwidth Filter Adjustments Setup A4A4 LC Adjustments + 10 V Temperature Compensation Supply CheckLocation of A4A4 21.4 MHz LC Filter Adjustments Location of A4A4 21.4 MHz Crystal Filter Adjustments A4A4 Xtal AdjustmentsPress Marker loFF. Key in CREsJ 30 kHz A4A8 LC Adjustments Key in @TFTiTj 30 kHz, Frequency Span 100 kHz. Press A4A8 Xtal AdjustmentsLocation of A4A8 21.4 MHz Crystal Filter Adjustments Key in t-1 100 kHz, C-1 200 kHz, and Marker LC Dip Adjustments AlOdB and A20dB Adjustments DB Bandwidth Adjustments 45. Location of 3 dB Bandwidth Adjustments DB Bandwidth Adjustments DB Bandwidth Adjustments Step Gain and 18.4 MHz Local Oscillator Adjustments Step Gain and 18.4 MHz Local Oscillator AdjustmentsStep Gain and 18.4 MHz Local Oscillator Adjustments Setup 47. Location of if Gain Adjustment If Gain Adjustment 48. Location of 10 dB Gain Step Adjustments DB Gain Step Adjustment MHz Local Oscillator Adjustment Key in Frequency Span 1kHz, REs 100 Hz, + 1OV Temperature Compensation Supply Adjustment Down/Up Converter Adjustments Optional Down/Up Converter Adjustments Down Converter Gain Adjustment Cables 52. Time Base Adjustment Setup 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 Type N m to BNC f Type N f to BNC f Reference AdjustmentsMHz Reference Adjustments 13 MHz 57. Location of 20 MHz Reference Adjustments 1Ol Delay 40ns1V / div Offset Coupling Press &K?@ Press CnTavj 58. Typical Signal at A16TP3 Type N m to BNC f MHz Phase Lock Oscillator AdjustmentsMHz Phase Lock Oscillator Adjustments Reference Description Location of 249 MHz Phase Lock Oscillator Adjustments Single Page Disconnect test equipment from instrument MHz Phase Lock Oscillator Adjustment 63. Second if Amplifier Adjustments Setup Second if Amplifier and Third Converter Adjustment Second if Amplifier and Third Converter Adjustment Adapters Second if Amplifier AdjustmentsBNC to SMB Snap-On Service Accessory 2 required Second if Amplifier and Third Converter Adjustment 66. Minimum Image Response at 258.4 MHz Third Converter Adjustment Type N m to BNC f 2 required Type N f to BNC f 2 required Pilot Second if Amplif’ier Adjustments1250-1745 1250-0780 1250-1474 1250-1749 Pilot Second if Amplifier Adjustments MHz Bandpass Filter Adjustments Waveforms Location of 269 MHz Bandpass Filter Adjustments Frequency Control Adjustments Frequency Control AdjustmentsHP 3456A Start-Up Time Slow Sweep Adjustment YTO and VT0 DAC Adjustments Full Sweep Adjustment Key in ml CF Step Size J 1023 Hz Start and Stop Adjustments S t Second Converter AdjustmentsSecond Converter Adjustments Reference Related Performance Set HP 8568B Spectrum Analyzer Line to on and press Second LO Frequency and Shift Adjustments 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 78 MHz Voltage-Tuned Oscillator Adjustments Setup Voltage-Tuned Oscillator Adjustments MHz Voltage-Tuned Oscillator Adjustments Dacs Accuracy Check Positive Supply AdjustmentConnect DVM to AllTPl located on All cover Center-Frequency Checks VT0 Slope Compensation Adjustments Slope Compensation AdjustmentsSMA m m Leveling EXT Input 81. Location of A22R66 Tiiit Adjustment 83. Location of Comb Generator Adjustments Comb Generator Adjustments 84. Comb Teeth Display Comb Generator Adjustments Comb Generator Adjustments 85. Analog-To-Digital Converter Adjustments Setup Analog-To-Digital Converter Adjustments Location of Analog-To-Digital Converter Adjustments Press Qnstr Preset Place instrument upright as shown in -87 with top and A3 ProcedureEquipment Digital Voltmeter DVM 88. Location of Track and Hold Adjustments Track and Hold Adjustments Track and Hold Adjustments Digital Storage Display Adjustments Digital Storage Display AdjustmentsReference Description Equipment Procedure Preliminary Graticule Adjustments 90. Location of Digital Storage Display Adjustments 91. Sample and Hold Balance Adjustment Waveforms Sample and Hold Balance Adjustments 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 Impulse Bandwidths Option Description Equipment Procedure DB Resolution Bandwidth Accuracy TestRelated Adjustment Specification Page Impulse and Resolution Bandwidth Accuracy Test Page Impulse and Resolution Bandwidth Accuracy Test Page 90 kHz 110 kHz 100 kHz MHz 30 kHz10 kHz 100 kHz KHz 900 kHz MHz 100 Hz 150 Hz 30 Hz 1FrequencyMHz 300 kHz KHz 300 Hz Press DB Resolution Bandwidth Selectivity Test DB Bandwidth Measurement 60 dB VlDEojMHz 20 MHz 100 Hz 11l 15 MHz 300 Hz 300 kHz Page Impulse and Resolution Bandwidth Selectivity Test Selectivity Frequency ‘EG Bandwidth DB BW Ratio Span Press LOG Enter dB/otv and key in 1 dB. Press Marker Procedure 1. Press ~NSTR Preset MHz 500 kHz 50 kHz 10 kHz KHz KHz 200 Hz 100 Hz LdB’ t-H+ ‘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 Test DB Resolution Bandwidth Adjustments 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 Related Adjustment Log Amplifier Adjustments Specification Log + 10 dBm Option 857 Amplitude Fidelity Test Frequency Sk1.0 dB %1.5 dB Marker a Performance Test Record DB sf1.5 dB Test 12. Option Amplitude Fidelity Test Min Max 6-5 6-6 6-5 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