HP 8565e schematic

HP 8564E and 8565E Spectrum Analyzers

Service Guide Supplement

Using Performance Tests When an

HP 3335A Source Is Not Available

Manufacturing Part Number: 08564-srvsup

Printed in USA

October 1999

© Copyright 1999 Hewlett-Packard Company

Notice

The information contained in this document is subject to change without notice.
Hewlett-Packard makes no warranty of any kind with regard to this material, including

but not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of this
material.

Assistance

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office.

General Safety Considerations

WARNING Before this instrument is switched on, make sure it has been properly

grounded through the protective conductor of the ac power cable to
a socket outlet provided with protective earth contact.

Any interruption of the protective (grounding) conductor, inside or
outside the instrument, or disconnection of the protective earth
terminal can result in personal injury.

WARNING There are many points in the instrument which can, if contacted,

cause personal injury. Be extremely careful.
Any adjustments or service procedures that require operation of the

instrument with protective covers removed should be performed
only by trained service personnel.

CAUTION Before this instrument is switched on, make sure its primary power circuitry

has been adapted to the voltage of the ac power source.
Failure to set the ac power input to the correct voltage could cause damage to

the instrument when the ac power cable is plugged in.

ii

Contents

1. Using this Adjustment Procedure Supplement

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

Implementation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

2. Test Equipment Required for Automated Adjustments

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

3. Manual Adjustment Procedures

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

3a. Manual Adjustment Procedures: HP 3335A Source Not Available

What You'll Find in This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3a-2

Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3a-3

4a. IF Amplitude Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3a-4

5a. DC Log Amplifier Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3a-9

Contents-1

Contents

Contents-2

1 Using this Adjustment Procedure

Supplement

1-1

Using this Adjustment Procedure Supplement

Introduction

Introduction

The HP 3335A Synthesizer Level Generator signal source has become obsolete because
parts used in the manufacture of this instrument are no longer available from suppliers.
To meet the needs of our customers, HP has created new performance verification tests
and adjustment tests that use alternative signal sources.

The calibration and service guides are being revised to add additional procedures that do
not use the HP 3335A. The changes include the addition of signal sources required to
replace the 3335A, changes to the test equipment setup illustrations, and changes in the
steps required to execute the procedures.

Because all of our customers will not need to replace the HP 3335A immediately, we are
releasing the changes to the calibration guide and service guides in the form of two manual
supplements. HP is making these procedure revisions available at this time in electronic
form, only. You can download this manual supplement, and add it to your current manual
as needed. You will not be required to replace your manuals just to incorporate these
changes. These changes will be incorporated in new manuals shipped in the future.

To add these changes to your existing manuals, refer to “Implementation Instructions,” on

page 3.

1-2 Chapter1

Using this Adjustment Procedure Supplement

Implementation Instructions

Implementation Instructions

Update your service guide by performing the following steps:

Step 1. After downloading this supplement, print a hard copy of the entire document.
Step 2. Remove page 2-7 and 2-8 from your service guide.
Step 3. Insert page 2-7 and 2-8 from the supplement into the service guide.
Step 4. Remove page 3-1 through 3-8 from your service guide.
Step 5. Insert page 3-1 through 2-8 from the supplement into the service guide.
Step 6. Remove the adjustment procedure chapter from the supplement, and insert it

into your service guide as Chapter 3a, “Manual Adjustment Procedures:

HP 3335A Source Not Available,” immediately after Chapter 3.

Chapter 1 1-3

Using this Adjustment Procedure Supplement

Implementation Instructions

1-4 Chapter1

2 Test Equipment Required for

Automated Adjustments

2-1

Test Equipment Required for Automated Adjustments

Introduction

Introduction

This chapter contains the table of test equipment that is required for the automated
adjustments. This table is to replace table Table 2-2., “Test Equipment Required for

Automated Adjustments” in Chapter 2, “Adjustment/Diagnostic Software,” of your service

guide.

2-2 Chapter2

Test Equipment Required for Automated Adjustments

Introduction

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Chapter 2 2-3

Test Equipment Required for Automated Adjustments

Introduction

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2-4 Chapter2

Test Equipment Required for Automated Adjustments

Introduction

This page intentionally left blank.

Chapter 2 2-5

Test Equipment Required for Automated Adjustments

Introduction

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2-6 Chapter2

Test Equipment Required for Automated Adjustments

Introduction

This page intentionally left blank.

Chapter 2 2-7

Test Equipment Required for Automated Adjustments

Introduction

Table 2-2. Test Equipment Required for Automated Adjustments

Description HP Model Number

Controller* HP 9000 model 236 (HP 9836) or

HP 9000 model 310 or
HP 9000 model 320 or
HP 9000 model 350

Synthesizer/level generator HP E4421B or

HP 8663A

Synthesized sweeper

Spectrum analyzer

‡

†

HP 83650A

HP 8566B (preferred) or
HP 8563E (2nd choice) or
HP 8563A or
HP 8562A

Power meter HP 438A

4.2 GHz power sensor HP 8482A

50 GHz power sensor

HP 8487A

Frequency counter HP 5342A

Digital multimeter HP 3478A

Power splitter HP 11667C

Testand Adjustment Module (TAM) HP 85629B

Cable, 50 GHz coax 8120-6164

§

Cable, BNC-to-SMB (2 required) 85680-60093

Cable, BNC-to-BNC (3 required) HP 10503A

Cable, 36 inch SMA 8120-1578

Cable, HP-IB (8 required) HP 10833A/B

* 4 megabytes of free memory is required for the adjustment program.

†

The software menu shows the HP 8340 as the synthesized sweeper, but it drives the required

HP 83650A (programming language set to “analyzer” mode).

‡

The software menu shows the HP 8566 as the spectrum analyzer, but it will drive the other

three spectrum analyzers listed. If an HP 8566 is used, it must be an HP 8566B, not HP 8566A.

§

Must have calibration factors down to 10 MHz; a standard HP 8487A is only calibrated down to

50 MHz.

2-8 Chapter2

Test Equipment Required for Automated Adjustments

Introduction

Equipment Connections

Computer (Controller) Setup

For HP 9000 model 236 computers, setup instructions are provided in Chapter 1,
“Computer Installation,” of the BASIC Operating Manual. For HP 9000 model 310, 320, or
350 computers, setup information is provided in the Configuration Reference Manual for
the Series 300 computers.

HP-IB Cables

All HP-IB controlled test equipment should be connected to the internal HP-IB of the
controller (select code 7).

Chapter 2 2-9

Test Equipment Required for Automated Adjustments

Introduction

2-10 Chapter2

3 Manual Adjustment Procedures

3-1

Manual Adjustment Procedures

Introduction

Introduction

This chapter contains information on manual adjustment procedures. Adjustments should
be performed after a repair or performance test failure, never perform adjustments as
routine maintenance. . For information on which adjustments to perform, refer to

Table 3-1.

Information on automated adjustments can be found in Chapter 2 of this service guide.
Following is a list of the automated adjustments:

Automated Adjustments

1. Initial Information

2. LO Frequency

3. YTO FM Coil

4. LOMA Adjustments

5. Fast Zero Span

6. 3rd Amp/2nd IF Align

7. Cal Out Adjustment

8. Front End Cal

9. IF Bandpass Poles

10. IF Amplitude

11. DC Log Adjustments

12. Sampling Oscillator

Manual Adjustments

1. High Voltage Power Supply Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

2. Display Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

3. IF Bandpass Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

4. IF Amplitude Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

5. DC Log Amplifier Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26

6. Sampling Oscillator Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

7. YTO Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

8. Calibrator Amplitude Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36

9. 10 MHz Reference Adjustment — OCXO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

10. 10 MHz Reference Adjustment — TCXO (Option 103) . . . . . . . . . . . . . . . . . . . . . . . 3-40

11. Demodulator Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42

12. External Mixer Bias Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-45

13. External Mixer Amplitude Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46

14. Signal ID Oscillator Adjustment (serial prefix 3517A and below) . . . . . . . . . . . . . . 3-49

15. 16 MHz PLL Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52

16. 600 MHz Reference Adjustment (serial prefix 3406A and above) . . . . . . . . . . . . . . 3-55

3-2 Chapter3

Manual Adjustment Procedures

Introduction

NOTE Before performing any adjustments, allow the spectrum analyzer to warm up

for at least 5 minutes.

Safety Considerations

Although this instrument has been designed in accordance with international safety
standards, this manual contains information, cautions, and warnings which must be
followed to ensure safe operation and to prevent damage to the instrument. Service and
adjustments should be performed only by qualified service personnel.

WARNING

• These servicing instructions are for use by qualified personnel
only. To avoid electrical shock, do not perform any servicing
unless you are qualified to do so.

• The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the product from all voltage
sources while it is being opened.

• Adjustments in this section are performed with power supplied to
the instrument and protective covers removed. There are voltages
at many points in the instrument which can, if contacted, cause
personal injury. Be extremely careful. Adjustments should be
performed only by trained service personnel.

• Power is still applied to this instrument with the
off position. Before removing or installing any assembly or
printed circuit board, remove the line-power cord.

• The power cord is connected to internal capacitors inside that
may remain live for 5 seconds after the instrument has been
disconnected from its source of supply.

• Use a nonmetallic adjustment tool whenever possible.

LINE switch in the

Which Adjustments Should Be Performed?

Table 3-1 lists the manual adjustments that should be performed when an assembly is

repaired or changed. It is important to perform the adjustments in the order indicated to
ensure that the instrument meets its specifications.

Chapter 3a, “Manual Adjustment Procedures: HP 3335A Source Not Available,” provides

instructions and procedures for making adjustments when the HP 3335A Synthesizer
Level Generator is not available. If the HP 3335A is not available, substitute those
procedures for the procedures of the same number and name found in this chapter.

Chapter 3 3-3

Manual Adjustment Procedures

Introduction

Test Equipment

The equipment required for the manual adjustment procedures is listed in Table 1-5,
“Recommended Test Equipment.” Any equipment that satisfies the critical specifications
given in the table may be substituted for the preferred test equipment.

Adjustable and Factory-Selected Components

Table 3-2 lists the adjustable components by reference designation and name. For each

component, the table provides a description and lists the adjustment number.
Refer to Table 3-3. for a complete list of factory-selected components used in the

instrument along with their functions. Factory-selected components are identified with an
asterisk on the schematic diagrams.

Adjustment Tools

For adjustments requiring a nonmetallic tuning tool, use fiber tuning tool,
HP part number 8710-0033.

Two different tuning tools may be necessary for IF bandpass adjustments, depending on
the type of tuning slug used in the slug-tuned inductors. If the tuning slug requires a
slotted tuning tool, use HP part number 8710-1010. If the tuning slug requires a forked
tuning tool, use HP part number 8710-0772.

Never try to force an adjustment control. This is especially critical when tuning variable
capacitors or slug-tuned inductors. Required service accessories, with part numbers, are
listed under “Service Kit” in Chapter 1, “General Information.”

Instrument Service Position

Refer to Chapter 4 for information on removing the spectrum analyzer cover assembly and
accessing all internal assemblies.

3-4 Chapter3

Table 3-1 Related Adjustments

Manual Adjustment Procedures

Introduction

Assembly

Changed or

Repaired

Perform the Following Related Adjustments

in the Order Listed

Adjustment Number

Manual Automated*

A1A1 keyboard No related adjustment
A1A2 RPG No related adjustment
A2 controller 16 MHz PLL adjustment 15

Display adjustment 2
If EEROM from old A2 controller could not be used

in new A2 or if EEROM must be replaced, also
perform the following adjustments:

LOMA adjustments 4
External mixer amplitude adjustment or 3rd

amp/2nd IF align

†

13 6

Front end cal 8

A3 interface

Display adjustment (fast zero span)

†

25

Front end cal 8

A4 log amp/cal osc

Display adjustment (fast zero span)

†

25

Demodulator adjustment 11

A5 IF

IF amplitude adjustment

†

DC log amplifier adjustment
IF bandpass adjustment
IF amplitude adjustment

†

†

†

410
511
39
410

A6 power supply High voltage power supply adjustment 1

Display adjustment 2

A6A1 HV module High voltage power supply adjustment 1

Display adjustment 2

A7 LOMA LOMA adjustments 4

Front end cal (or perform the frequency response

8

performancetest in theHP 8560 E-Series Spectrum
Analyzer Calibration Guide. The adjustment must
be performed if the performance test fails.)

A8 low band

Front end cal 8

mixer
A9 input

attenuator

Front end cal (or perform the frequency response

performancetest in theHP 8560 E-Series Spectrum

8

Analyzer Calibration Guide. The adjustment must
be performed if the performance test fails.)

Chapter 3 3-5

Manual Adjustment Procedures

Introduction

Table 3-1 Related Adjustments (Continued)

Assembly

Changed or

Repaired

A10/A12

Perform the Following Related Adjustments

Adjustment Number

in the Order Listed

Manual Automated*

Front end cal 8

RYTHM/SBTX

A11 YTO

YTO adjustment
LO frequency
YTO FM coil

‡

‡

‡

7

A13 2nd converter Front end cal 8
A14 frequency

Display adjustment (fast zero span)

†

25

control

YTO adjustment
LO frequency
YTO FM cal

‡

‡

‡

7

Front end cal 8

A15 RF 10 MHz reference adjustment (TCXO, Option 103)

or CAL OUT adjustment

†

15 7

2
3

2
3

Calibrator amplitude adjustment or CAL OUT
adjustment

†

87

External mixer bias adjustment 12
Sampling oscillator adjustment 6 12
Signal ID oscillator adjustment 14
External mixer amplitude adjustment or 3rd

amp/2nd IF align

†

13 6

Front end cal 8

A15U100 sampler

Sampling oscillator adjustment

†

612

A17 CRT driver Display adjustment 2
A18V1 CRT Display adjustment 2
A19 HP-IB No related adjustment
A21 OCXO 10 MHz reference adjustment (OCXO) 9
*If any automated adjustment is required, you must first perform automated adjustment 1,

Initial Information.

†

Either the manual or the automated adjustment may be performed.

‡

Perform either the manual “YTO adjustment” (7) or the automated “LO frequency” and “YTO

FM coil” adjustments (2 and 3).

3-6 Chapter3

Table 3-2 Adjustable Components

Manual Adjustment Procedures

Introduction

Reference

Designator

A2R152 16 MHz PLL ADJ 22 Adjusts the free-running frequency of the

A2R206 DGTL X GAIN 2 Adjusts the horizontal gain in the X line

A2R209 SWEEP OFFSET 2 Adjusts the beginning of the trace to the

A2R215 DGTL Y GAIN 2 Adjusts the vertical gain in the Y line

A2R218 VIDEO OFFSET 2 Adjusts the vertical position in fast-analog

A2R262 STOP BLANK 2 Adjusts the blanking at the end of a vector on

A2R263 START BLANK 2 Adjusts the blanking at the start of a vector on

A2R268 VIDEO GAIN 2 Adjusts the vertical gain in fast-analog zero

A2R271 SWEEP GAIN 2 Adjusts the end of the trace to the rightmost

A4C707 FM DEMOD 16 Adjusts the FM demodulation for a peak

A4R445 LIMITER PHASE 5 Adjusts Limiter Phase for peak response.
A4R531 LOG AMP TOS 5 Minimizes error to Top of Screen.
A4R544 LIN FIDELITY BOW 5 Minimizes Linearity Fidelity error.
A4R826 CAL OSC AMPTD 4 Sets calibration oscillator output power

A5L300 LC CTR 1 3 Adjusts center frequency of first stage of LC

A5L301 LC CTR 2 3 Adjusts center frequency of second stage of LC

A5L700 LC CTR 3 3 Adjusts center frequency of third stage of LC

A5L702 LC CTR 4 3 Adjusts center frequency of fourth stage of LC

A5R343 15 DB ATT 4 Adjusts the attenuation of the reference 15 dB

Adjustment Name Adjustment

Number

Description

16 MHz CPU clock

generator.

leftmost vertical graticule line in fast-analog
zero-span mode.

generator.

zero span to match the digital zero-span input.

the display.

the display.

span to match with the digital zero-span
input.

vertical-graticule line in fast-analog zero-span
mode.

response.

(nominally −35 dBm). This power is injected
into the IF during the AUTO IF ADJUST
routines.

bandwidth filter to 10.7 MHz.

bandwidth filter to 10.7 MHz.

bandwidth filter to 10.7 MHz.

bandwidth filter to 10.7 MHz.

attenuator for 15 db between minimum and
maximum attenuation.

Chapter 3 3-7

Manual Adjustment Procedures

Introduction

Table 3-2 Adjustable Components (Continued)

Reference

Designator

A5T200 XTAL CTR 1 3 Adjusts center frequency of first stage of

A5T202 XTAL CTR 2 3 Adjusts center frequency of second stage of

A5T500 XTAL CTR 3 3 Adjusts center frequency of third stage of

A5T502 XTAL CTR 4 3 Adjusts center frequency of fourth stage of

A6R410 HV ADJ 1 Adjusts the voltage between A6TP405 and

A14R42 6.01 GHz 7 Adjusts the main coil tune driver current at a

A14R76 FM SPAN 7 Adjusts the FM span accuracy by affecting the

A14R93 3.2 GHz 7 Adjusts the main coil fixed driver current at a

A15C100 SMPL MATCH 6 Transforms the sampler input impedance to

A15C210 VCO RANGE 6 Adjusts the VCO tank capacitance so that 21V

A15C629 SIG ID 19 Fine adjusts the 298 MHz SIG ID oscillator

A15U302 10 MHz ADJ 15 Adjusts frequency of the temperature

A15R561 CAL AMPTD 13 Adjusts amplitude of the 300 MHz calibrator

A15R926 EXT BIAS ZERO 17 Adjusts zero bias point of external mixer bias.
A17R4 Z GAIN 2 Adjusts maximum intensity.
A17R11 CUTOFF 2 Adjusts intensity to turn off blanked lines.
A17R21 Z FOCUS 2 Adjusts focus for lines of different brightness.
A17R26 X FOCUS 2 Adjusts focus at the left and right corners of

A17R34 COARSE FOCUS 2 Adjusts focus at the center of the display.
A17R55 X GAIN 2 Adjusts the horizontal-deflection amplifier

Adjustment Name Adjustment

Number

Description

crystal bandwidth filter to 10.7 MHz.

crystal bandwidth filter to 10.7 MHz.

crystal bandwidth filter to 10.7 MHz.

crystal bandwidth filter to 10.7 MHz.

A6TP401 to the voltage marked on the A6A1
high voltage module.

YTO frequency of 6.01 GHz (near the upper
YTO frequency limit).

sensitivity of the FM coil driver.

YTO frequency of 3.2 GHz (near the lower
YTO frequency limit).

50 ohms over the 285 to 297.2 MHz range.

on the VCO tune line equals 298 MHz VCO
frequency.

frequency to optimize its performance.

compensated crystal oscillator (TCXO) to
10 MHz.

signal to −10.0 dBm.

the display.

gain.

3-8 Chapter3

Table 3-2 Adjustable Components (Continued)

Manual Adjustment Procedures

Introduction

Reference

Designator

A17R57 X POSN 2 Adjusts the CRT horizontal position.
A17R75 Y GAIN 2 Adjusts the vertical-deflection amplifier gain.
A17R77 Y POSN 2 Adjusts the CRT vertical position.
A17R90 TRACE ALIGN 2 Adjusts the display axis rotation.
A17R92 DDD 2 Adjusts focus of the center of the display.
A17R93 ASTIG 2 Adjusts for the spot roundness on the CRT

Adjustment Name Adjustment

Number

Description

display.

Table 3-3. Factory Selected Components

Reference

Designator

A5C204 3 Selected to optimize center frequency of LC tank that loads the

A5C216 3 Selected to optimize center frequency of LC tank that loads the

A5C326 3 Selected to optimize LC pole center frequency.

Adjustment

Number

Basis of Selection

crystal.

crystal.

A5C327 3 Selected to optimize LC pole center frequency.
A5C505 3 Selected to optimize center frequency of LC tank that loads the

crystal.

A5C516 3 Selected to optimize center frequency of LC tank that loads the

crystal.
A5C717 3 Selected to optimize LC pole center frequency.
A5C718 3 Selected to optimize LC pole center frequency.

Chapter 3 3-9

Manual Adjustment Procedures

Introduction

3-10 Chapter3

3a Manual Adjustment Procedures:

HP 3335A Source Not Available

3a-1

Manual Adjustment Procedures: HP 3335A Source Not Available

What You'll Find in This Chapter

What You'll Find in This Chapter

This chapter provides alternative procedures for the adjustment of the spectrum analyzer
that do not require the use of the HP 3335A Synthesizer Level Generator. The HP 3335A
has been discontinued. Bcause of the unavailability of the HP 3335A, new adjustments
procedures are required that use different signal sources. If the HP 3335A is not available,
substitute these procedures for those of the same number found in Chapter 3, “Manual

Adjustment Procedures.”

3a-2 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

Required Test Equipment

Required Test Equipment

The following table lists the test equipment required to execute the adjustments in this
chapter. These adjustments originally required the use of the HP 3335A Synthesizer Level
Generator.

Table 3a-1 Recommended Test Equipment

Instrument Critical Specifications for Equipment

Substitution

Sources

Synthesized Signal Generator

Cables

Cable, 50 Ω coaxial

(four required)

Cable Test Cable 85680-60043

Adapters

Adapter

(four required)

Frequency range: 250 kHz to 3 GHz
Frequency resolution: 1 Hz
Attenuator resolution: 0.02 dB
Level accuracy: ±0.5 dB
External 10 MHz Ref. Input

Connectors: BNC (m)
Length: ≥ 122 cm (48 in.)

Type N (m)-to-BNC (f) 1250-1476

Recommended

Model

HP E4421B or
HP E4422B,
HP E4432B,
HP E4433B

HP 10503A

Adapter Type N (f)-to-2.4 mm (f) HP 11903B
Adapter 2.4 mm (f) to BNC (f) 1250-2187
Adapter

(Option 026 only)

Adapter

(Option 026 only)

Chapter 3 3a-3

APC-3.5 (f) to APC-3.5 (f) 5061-5311

APC-3.5 (f) to BNC-3.5 (f) 1250-1200

Manual Adjustment Procedures: HP 3335A Source Not Available

4a. IF Amplitude Adjustments

4a. IF Amplitude Adjustments

The IF amplitude adjustments consist of the cal oscillator amplitude adjustment and the
reference 15 dB attenuator adjustment.

Assembly Adjusted

A4 log amp/cal oscillator A5 IF assembly

Related Performance Tests

IF Gain Uncertainty Scale Fidelity

Description

This adjustment sets the output amplitude of the A4 log amp/cal oscillator and the
absolute amplitude of the reference 15 dB attenuator.

The output of the A4 log amp/cal oscillator is adjusted so that a −55 dBm signal applied to
the 10.7 MHz IF input on the A5 IF assembly (A5J3) causes a displayed signal of −60 dBm.
The effect of this adjustment is visible only after the
complete.
amplitude from the A4 log amp/cal oscillator.

This procedure also sets the attenuator of the reference 15 dB attenuator so that a source
amplitude change of 50 dB combined with a spectrum analyzer reference level change of
50 dB displays an amplitude difference of 50 dB.

Figure 3a-1 IF Amplitude Adjustment Setup

ADJ CURR IF STATE causes the IF gain adjustment to use the “new” output

ADJ CURR IF STATE sequence is

3a-4 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

4a. IF Amplitude Adjustments

Equipment

Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP E4421B

Adapters

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Type N (f) to 2.4 mm (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 11903B

Cables

BNC, 122 cm (48 in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 10503A

Test cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85680-60093

Figure 3a-2 IF Amplitude Adjustment Locations

NOTE The 15 dB reference attenuator adjustment is preset at the factory and need

not be done if the entire A5 IF assembly is replaced.

Chapter 3 3a-5

Manual Adjustment Procedures: HP 3335A Source Not Available

4a. IF Amplitude Adjustments

Procedure

1. Press LINE to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
place the spectrum analyzer in the service position as illustrated in Figure 3a-1.

2. Disconnect W29, violet coax cable, from A5J3. Connect the test cable between A5J3 and
the RF output of the HP E4421B. Press

3. Set the spectrum analyzer controls as follows:

Center Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200 kHz

Reference Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−60 dBm

Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 dB

dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 dB/DIV

Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz

Video bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 Hz

LINE to turn the spectrum analyzer on.

4. On the spectrum analyzer, press

MKR, CAL, and IF ADJ ON OFF so OFF is underlined.

5. Set the HP E4421B controls as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−55 dBm

Mod On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off

6. Note the marker value. Ideally it should read −60 dBm ±0.1 dB.

7. If the marker reads less than −60.1 dBm, rotate A4R826 CAL OSC AMPTD one-third
turn clockwise for every 0.1 dB less than −60 dBm. See Figure 3a-2 for the location of
A4R826. A change in the displayed amplitude will not be seen until

ADJ CURR IF STATE

is pressed.

8. If the marker reads greater than −59.9 dBm, rotate A4R826 CAL OSC AMPTD
one-third turn counter clockwise for every 0.1 dB greater than −60 dBm. See

Figure 3a-2 for the location of A4R826. A change in the displayed amplitude will not be

seen until

ADJ CURR IF STATE is pressed.

NOTE If A4R826 has inadequate range, refer to “Inadequate CAL OSC AMPTD

Range” in Chapter 9.

9. On the spectrum analyzer, press

ADJ CURR IF STATE. After allowing the analyzer time

to complete the adjustments, the displayed amplitude and marker reading should
change.

10.Repeat step 7 and step 9 until the marker reads −60 dBm ±0.1 dB.

11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.

3a-6 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

4a. IF Amplitude Adjustments

A5 Reference Attenuator Adjustment

1. Set the spectrum analyzer reference level to −60 dBm. If markers are displayed, press

MKR and MARKERS OFF.

2. Set the HP E4421B

AMPLITUDE to −60 dBm.

3. Connect a BNC cable between the RF output of the HP E4421B and the spectrum
analyzer INPUT 50Ω.

4. On the spectrum analyzer, press

CAL and REF LVL ADJ. Use the front panel knob or step

keys to place the peak of the displayed signal 3 dB to 5 dB below the reference level.

5. On the spectrum analyzer, press

PEAK SEARCH and MARKER DELTA. Set the spectrum

analyzer reference level to −10 dBm.

6. Change the HP 4421B

7. On the spectrum analyzer, press

Amplitude to −10 dBm.

CAL.

8. Note the ∆MKR amplitude. Ideally, it should read 50.00 dB ±0.1 dB.

9. If the ∆MKR amplitude is less than 49.9 dB, rotate A5R343 15 dB ATTEN one-half turn
counterclockwise for each 0.1 dB less than 50.00 dB. Do not adjust A5R343 more than
five turns before continuing with the next step.

10.If the ∆MKR amplitude is greater than 50.1 dB, rotate A5R343 15 dB ATTEN one-half
turn clockwise for each 0.1 dB greater than 50.00 dB. Do not adjust A5R343 more than
five turns before continuing with the next step.

11.On the spectrum analyzer, press

ADJ CURR IF STATE. Note the ∆MKR amplitude

reading.

12.Repeat step 1 through step 11 until the ∆MKR amplitude reading is 50.00 dB ±0.1 dB.

Chapter 3 3a-7

Manual Adjustment Procedures: HP 3335A Source Not Available

4a. IF Amplitude Adjustments

A5 Adjustment Verification

1. On the spectrum analyzer, disconnect W29 from A5J3. Connect the test cable between
A5J3 and the RF output of the HP E4421B.

2. Set the spectrum analyzer reference level to −10 dBm.

3. Set the HP E4421B

4. On the spectrum analyzer, press

Amplitude to −5 dBm.

MKR and MARKER NORMAL.

5. The MARKER amplitude should read −10 dBm ±0.13 dB. If the reading is outside of
this range, repeat step 4 of “Procedure,” on page 6 through “A5 Reference Attenuator

Adjustment” step 12.

6. On the spectrum analyzer, reconnect W29 to A5J3. Press

PRESET and set the controls

as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 MHz

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 Hz

Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−10 dBm

Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz

7. Connect a BNC cable between the HP 8563E CAL OUTPUT and INPUT 50Ω.

8. On the spectrum analyzer, press

MKR CAL and REF LVL ADJ.

9. Use the knob or step keys to adjust the REF LEVEL CAL setting until the MKR reads

−10.00 dBm ±0.1 dB.

10.On the spectrum analyzer, press

STORE REF LVL.

3a-8 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

5a. DC Log Amplifier Adjustments

There are three DC log adjustments; limiter phase, linear fidelity, and log fidelity.

Assembly Adjusted

A4 log amp/cal oscillator

Related Performance Tests

IF Gain Uncertainty Scale Fidelity

Description

These three adjustment need only be done under the following conditions:

Limiter phase Only if a repair is made to blocks F, G, H, I, or J.
Linear fidelity Only if a repair is made to blocks C, D, F, G, H, I, J, K, O, IF gain accuracy,

RBW switching, or log fidelity.

Log fidelity Only if a repair is made to blocks D, F, H, K, IF gain accuracy, RBW

switching, or log fidelity.

If multiple adjustments are required they should be done in the following order:

1. Limiter Phase

2. Linear Fidelity

3. Log Fidelity

Figure 3a-3 DC Log Adjustment Setup

Chapter 3 3a-9

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

Equipment

Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP E4421B

Adapters

Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476

Type N (f) to 2.4 mm (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11903B

Cables

BNC, 122 cm (48 in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Test cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85680-60093

Figure 3a-4 DC Log Adjustment Locations

NOTE Adjustments should be made with all of the shields on and only after allowing

at least a 20 minute warmup.

3a-10 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

A4 Limiter Phase Adjustment

1. Press LINE to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
place the spectrum analyzer in the service position as illustrated in Figure 3a-3. See

Figure 3a-4 for adjustment location.

2. Connect the HP E4421B RF output to the spectrum analyzer 50Ω input. Press
turn the spectrum analyzer on.

3. Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz

Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm

dB/division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/DIV

Resolution bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

IF ADJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF

4. Set up an HP E4421B as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −18 dBm

Mod On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off

5. On the spectrum analyzer, press
complete adjustments then press

CAL and ADJ CURR IF STATE, wait for the analyzer to

MKR.

LINE to

6. Adjust A4R445 for maximum on-screen amplitude. Refer to Figure 3a-4 for the location
of A4R445.

Chapter 3 3a-11

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

A4 Linear Fidelity Adjustment

1. Press LINE to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
place the spectrum analyzer in the service position as illustrated in Figure 3a-3. See

Figure 3a-4 for adjustment location.

2. Connect the HP E4421B RF output to the spectrum analyzer 50Ω input. Press
turn the spectrum analyzer on.

3. On the spectrum analyzer, press

AMPTD UNITS, dBm, CAL, and IF ADJ ON OFF (OFF).

PRESET AMPLITUDE, LINEAR, MORE 1 of 3,

4. Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 MHz

Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 kHz

Reference level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−10 dBm

5. Set up an HP E4421B as follows:

Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Amplitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .−10 dBm

Mod On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off

6. On the spectrum analyzer, press

PEAK SEARCH and MARKER DELTA.

7. Reduce the HP E4421B input power to −58 dBm.

8. If the delta marker amplitude reads −40 dB ±2 dB, no adjustment is necessary.

LINE to

9. If the signal is lower on the screen than expected (delta marker amplitude reads less
than −42dB) then adjust A4R544 (see Figure 3a-4) for an even lower level and press

CAL and ADJ CURR IF STATE. Allow sufficient time for the analyzer to complete the

adjustment.

10.If the signal is higher on the screen than expected (delta marker amplitude reads
greater than −38 dB) then adjust A4R544 for an even higher level signal and press

CAL

and ADJ CURR IF STATE. Allow sufficient time for the analyzer to complete the
adjustment.

11.Repeat step 7 through step 10.

3a-12 Chapter3

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

A4 LOG Fidelity Adjustment

1. Press LINE to turn the spectrum analyzer off. Remove the spectrum analyzer cover and
place the spectrum analyzer in the service position as illustrated in Figure 3a-3. See

Figure 3a-4 for adjustment location.

2. Connect the HP E4421B RF output to the spectrum analyzer 50Ω input. Press
turn the spectrum analyzer on.

3. On the spectrum analyzer, press

ADJ CURR IF STATE.

PRESET, CAL, IF ADJ ON OFF (OFF), and

4. Set the spectrum analyzer controls as follows:

Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Span. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 MHz

Resolution bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 kHz

Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm

5. Set up an HP E4421B as follows:

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MHz

Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 dBm

Mod On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Off

6. On the spectrum analyzer, press

MKR and MARKER DELTA.

7. Decrease the HP E4421B power to −26 dBm.

LINE to

8. Calculate the error:

Error delta marker reading 16 dB–=

9. If the error is less than ±0.2 dB, no adjustment is necessary.

10.Set the HP E4421B power to −10 dBm.

11.Adjust A4R531 (see Figure 3a-4) to read two times the error. For example, if the
calculated error is +0.75 dB, adjust A4R531 for a delta marker amplitude reading of
+1.5 dB. Press

12.Repeat step 7 through step 11.

CAL and ADJ CURR IF STATE.

Chapter 3 3a-13

Manual Adjustment Procedures: HP 3335A Source Not Available

5a. DC Log Amplifier Adjustments

3a-14 Chapter3

Index

A

A4 limiter phase adjustment

3a-11

A4 linear fidelity adjustment

3a-12

A4 log fidelity adjustment
adjustment

adjustable components table

3-5

factory selected components
related adjustments table
safety considerations
tools

, 3-4

adjustment procedures

cal oscillator amplitude
DC log amplifiers
IF amplitude

adjustments

recommended test equipment

3a-3

, 3a-4

, 3a-13

, 3-3

, 3-2

, 3a-4

, 3a-9

,
,

,

, 3-5

, 3-4

,

C

components

adjustable components table

3-5

D

DC log amplifer adjustments

3a-9

I

IF amplitude adjustments
implementation instructions
introduction

L

limiter phase adjustment
linear fidelity adjustment
log fidelity adjustment

T

test equipment list
test equipment, automated

adjustments

tools

adjustment

U

using the supplement

, 1-2

, 2-18

, 3-4

, 3a-4

, 3a-11

, 3a-12

, 3a-13

, 3a-3

, 1-1

,

,

, 1-3

Index Index-1