Agilent 35670A Service Guide
 Agilent 35670A at a Glance Front Panel
 Agilent 35670A Front Panel
 Agilent 35670A at a Glance Rear Panel
 Plot/Print menus
Agilent 35670A Rear Panel
 Saftey Summary
 Do not Operate in AN Explosive Atmosphere
 Safety Symbols
 Available Accessories
Supplied Accessories
 This Book
 Table of Contents
 Preparing the Analyzer for Use
Page
 Troubleshooting the Analyzer
 Adjusting the Analyzer
 Replaceable Parts
 Circuit Descriptions
 Voltages and Signals
 Specifications
 Abbreviations
Specifications
 Frequency
Channel mode option AY6 only
 Average, 0 to −80 dBfs
Single Channel Amplitude
 FFT Dynamic Range
 Window Parameters
Single Channel Phase
Input Noise
 Cross Channel Amplitude
Cross Channel Phase
 Input
 Trigger
Time Domain
 Tachometer
 Source Output
 Gpib
Digital Interfaces
 Cispr
General Specifications
 Max Order⋅ Max RPM
Order Tracking Option 1D0
 Arbitrary Waveform Source-Option 1D4
Swept Sine Measurements -Option 1D2
 = 1, 3 or
Real Time Octave Analysis Option 1D1
 Recommended Test Equipment
 Suggested Assembly for Series Resistor
 Schematic and Parts List for Notch Filter
 TTL
 Preparing the Analyzer for Use
 AC Power Requirements
DC Power Requirements
Line voltage
Operating Typical Current Voltage Standard 2 channel
 AC Power Cable and Grounding Requirements
DC Power Cable and Grounding Requirements
 Preparing the Analyzer for Use
Subject the operator to lethal voltages
 To do the incoming inspection
 Set the analyzer’s power switch to on
 Other excessive moisture
To install the analyzer
 Connect the dc power cable to the dc power source
To connect the analyzer to a dc power source
 Set the analyzer’s power switch to on l
Turn on the dc power source
Adapter, be careful of the heat from the adapter’s tip
At the end of this chapter
 AC Fuse
To change the fuses
DC Fuse
 Part Number Cable Description
To connect the analyzer to a serial device
To connect the analyzer to a parallel device
 Reference
To connect the analyzer to an Gpib device
 To connect the analyzer to an external monitor
Pin Number Signal Name
 To connect the optional keyboard
Set the power switch to off O
 Connect the other end of the keyboard cable to the keyboard
 Standard 2 channel Agilent 35670A Optional 4 channel
To connect the microphone adapter
 To store the analyzer
To clean the screen
 To transport the analyzer
 If the analyzer will not power up
 Agilent 35670A
 Verifying Specifications
 Overview
Verifying Specifications
 Test Duration
Features of the Program
Calibration Cycle
Recommended Test Equipment
 Program Controlled Test Equipment
Operation Verification and Performance Tests
Measurement Uncertainty
Test Equipment Program Controlled Model
 Operation Verification Tests Performance Tests
 Specification Performance Test
Specifications and Performance Tests
 Local/GPIB
Now go to one of the following procedures to continue
To load the program
 To run the program in semiautomated mode
 Voltages that could result in injury to personnel
Press the following keys to start the test
Follow the directions on the display
 Press the following keys
To run the program without a printer
 Agilent 35670A
 To run the program in manual mode
 To set up the self test
 To set up the dc offset test
 To set up the noise test
 To set up the spurious signals test
 To set up the amplitude accuracy test
 To set up the flatness test
 To set up the amplitude linearity test
 To set up the A-weight filter test
 To set up the channel match test
 To set up the frequency accuracy test
 To set up the anti-alias filter test
 To set up the input coupling test
 To set up the harmonic distortion test
 2A 2 ch
 Using a synthesizer and notch filter
 To set up the intermodulation distortion test
 2 ch
 To set up the cross talk test
 Verifying Specifications
 Verifying Specifications
 Agilent 35670A
 To set up the single channel phase accuracy test
 To set up the external trigger test
 1A 2 ch
 To set up the tach function test
 To set up the tach function test
 To set up the input resistance test
 To set up the input resistance test
 To set up the ICP supply test
 To set up the ICP supply test
 Agilent 35670A
 Verifying Specifications
 To set up the source amplitude accuracy test
 To set up the source output resistance test
 To set up the source output resistance test
 To set up the source dc offset test
 To set up the source flatness test
 To set up the source distortion test
 ITM35670A Main Menu Descriptions
 Press Start Testing to display the following softkeys
Start Testing Menu Descriptions
 Test Configuration Menu Descriptions
 Equipment Configuration Menu Descriptions
 Prompts you to enter the analyzer’s report number
Title Page Menu Descriptions
 Measurement Uncertainty
 ±0.0020 dB 101 ±0.0026 dB ±0.0046 dB ±0.0096 dB ±0.0255 dB
 Using Other Test Equipment
 Test Instruments Used
Performance Test Record Two Channel
 Noise
Self Test
DC Offset
 Spurious Signals
 Performance Test Record Two Channel
 Agilent 35670A Verifying Specifications
 Flatness
Amplitude Accuracy
 −11 dBVrms, 99.84 kHz, One Ch, Ch
Amplitude Linearity
 Channel Match
Weight Filter
 Input Coupling
Frequency Accuracy
Anti-Alias Filter
 Harmonic Distortion
 Cross Talk
Intermodulation Distortion
 Tach Function option D01 only
Single Ch Phase Accuracy
External Trigger
 ICP Supply
Input Resistance
Source Amplitude Accuracy
Source Output Resistance
 Source Distortion
Source DC Offset
Source Flatness
 Performance Test Record Four Channel
 Four Ch, 6.4 kHz Span, Ch
 Four Ch, 0 Hz Start, Ch
 Performance Test Record Four Channel
 Agilent 35670A Verifying Specifications
 Spurious Signals
 Amplitude Accuracy
 Serial NumberReport Number Test Date
 −11 dBVrms, 25.6 kHz, Four Ch, Ch
 Amplitude Linearity
 Ch 3, 100 Hz
 Two Ch, 2/1, − 13 dBV FS Mag
 Performance Test Record Four Channel
 One Ch, Ch 1, 51.2 kHz
 Four Ch, 12.25 kHz 2nd, Ch
 Two Ch, F1−2F2, 1048 Hz, Ch
 Receiver Ch 1, Driver Ch 2, 3
 Ch 31 Open Circuit Voltage
 Ch 3 Current
 12.8 kHz 25.6 kHz 51.2 kHz
 Operation Verification Test Record Two Channel
 Self Test
 Operation Verification Test Record Two Channel
 Operation Verification Test Record Two Channel
 Spurious Signals
 Operation Verification Test Record Two Channel
 Ch 1, 10 Hz Ch 2, 10 Hz Ch 1, 31.62 Hz Ch 2, 31.62 Hz
 Operation Verification Test Record Two Channel
 Frequency Accuracy
 Open Circuit Voltage
 Operation Verification Test Record Four Channel
 Verifying Specifications Agilent 35670A
 Four Ch, 1400 Hz Start, Ch −80
 Operation Verification Test Record Four Channel
 Operation Verification Test Record Four Channel
 Spurious Signals
 Amplitude Accuracy
 Serial NumberReport Number Test Date
 Flatness
 Amplitude Linearity
 Weight Filter
 Two Ch, 2/1, 7 dBV −20 dBfs Mag
 Frequency Accuracy
 Ch 3 Open Circuit Voltage
 Source Amplitude Accuracy
Page
 Troubleshooting the Analyzer
 Safety Considerations
Troubleshooting the Analyzer
 Equipment Required
Troubleshooting Hints
 Symptom Troubleshooting Test
How to troubleshoot the analyzer
 Failures.’’
To perform initial verification
Data appears
 Symptom Probable Faulty Assembly
 Power supply.’’
Connect the power cord and set the power switch to on l
Rear panel
Remove the cover
 Signal Name Test Location Frequency Probable Faulty Assembly
 A7 Component Locator, Circuit Side
 Signal Name Test Location
Using a logic probe, check the following signals
 Set the power switch to on l
To troubleshoot the power supply
Probably faulty
Reconnect the ribbon cable to the Power Supply assembly
 A6 Digital A5 Analog A2 Input optional A1/A2 Input
 Remove the A7 CPU assembly
 Set the power switch to off O Remove the A7 CPU assembly
 Entry closest to the beginning of the table
To troubleshoot power-up failures
 Determine if the power-on test passed or failed
 Binary Hexa ~Time LEDs Description DS5 DS9 Decimal Visible
Power-on LEDs Next Test
 SW2
To troubleshoot CPU, memory, and buses failures
Fail code to the following table
More than 4 seconds
 Binary Hexadecimal Probable Faulty Assembly DS5 DS9
 A7 Component Locator, Circuit Side
 LEDs should sequence through 00 clear LEDs with 00 remaining
 To troubleshoot display failures
Faulty
Connect the voltmeter to A102 TP1
Check that the voltage reads is 210 10 Vdc
 Test Location Signal Name In/Out
 CPU
 To troubleshoot IIC bus failures
 LEDs, and the display
Attach a logic probe to A7 P7 pin 2 SCL
 Attach the logic probe to A7 P7 pin 1 SDA
 Troubleshooting the Analyzer
 To troubleshoot fast bus failures
A7 P10 Pin Signal Name TTL Logic State In Test Mode
 To troubleshoot fast bus failures
 Remove all cables from the front panel input connectors
Using a BNC cable
To perform self tests
After calibration is complete, press the following keys
 ‘’To troubleshoot self-test lockup failures.’’
When the tests have finished, press the following keys Rtn
40‘’To troubleshoot intermittent failures.’’
Following table
 Fifo
 Troubleshooting the Analyzer
 Agilent 35670A
 A7 CPU Gpib
Failure Probable Faulty Assembly Next Test
 To troubleshoot self-test lockup failures
 System Utility More
 TimesTimesP10ALL Continue
 To troubleshoot intermittent failures
Common Reasons Troubleshooting Procedure
 After this test detects a failure, press the following keys
Preset
 To troubleshoot performance test failures
 CPU
 Failing Performance Test Troubleshooting Guide
 Source
To troubleshoot source and calibrator failures
 Connect the voltmeter to A5 TP3 Press the following keys
Assembly is
 Oscilloscope Setup Parameters Waveform
 Check the calibrator output
 Press LOW Level CAL
Press the following keys
 Check the Input assembly
 Set the frequency synthesizer as follows
Test Location Amplitude 10% Probable Faulty Assembly
To troubleshoot input and ADC failures
 To troubleshoot input and ADC failures
 Enter numbers between 127 and +128
Set the oscilloscope to 700 mV/div
 To troubleshoot input failures on four channel analyzers
 Exchange the Input assemblies
 Assembly that failed is probably faulty
‘’Verifying Specifications.’’
To troubleshoot distortion failures
Guides at the sides of the card nest
 To troubleshoot disk drive failures
 New formatted disk and repeat the previous step
 To troubleshoot auto-range failures
Set the power switch to on l Press the following keys
Inst Mode
 Range should be set to 5 dBVrms
 To troubleshoot DIN connector failures
 Trigger
To troubleshoot trigger failures
Meas Data
 Press EXT Range +
Change the frequency synthesizer’s amplitude to 0.3 Vp-p
 Trigger Mode Failing Probable Faulty Assembly or Next Step
 Agilent 35670A
 Check external trigger signal to the Analog assembly
 To troubleshoot memory battery failures
 To troubleshoot memory battery failures
 To troubleshoot microphone power and adapter failures
 To troubleshoot tachometer failures
Oscilloscope Setup Parameters
 Press TRG Range +
With 2 ±0.2 Vdc offset
Page
 Adjusting the Analyzer
 Adjustment Assembly Component
Adjusting the Analyzer
 Operator controls inside the analyzer
Potentially dangerous voltages
 Remote Operation
Adjustment Gpib Code
 Equipment Required Frequency Counter
To adjust the frequency reference
 Equipment Required Multimeter
To adjust the source
 Equipment Required Oscilloscope
To adjust the ADC gain, offset and reference
 Set the oscilloscope as follows
Adjust A5 R407 for a flat trace on the oscilloscope
 Service Tests Adjustmts ADC Adjustmnt Offset
 Equipment Required None
To adjust the input dc offset
 Set the power switch to on Press the following keys
 Channel 3 Adjustmnt Offset
 Equipment Required BNC-to-BNC Cable
To adjust common mode rejection
 Service Tests Adjustmts Channel 1 Adjustmnt Cmrr
 Channel 3 Adjustmnt Cmrr
 Channel 4 Adjustmnt Cmrr
 To adjust filter flatness
 Rtn Channel 2 Adjustmnt 50 kHz Flatness
Channel 1 Adjustmnt 50 kHz
 Rtn Channel 2 Adjustmnt 25 kHz Flatness
Channel 1 Adjustmnt 25 kHz
 Rtn Channel 4 Adjustmnt 25 kHz Flatness
Rtn Channel 3 Adjustmnt 25 kHz Flatness
 To adjust the display voltage
 To adjust the display voltage
 Replacing Assemblies
 Replacing Assemblies
 What to do before replacing the CPU assembly
 What to do after replacing an assembly
 A9 Nvram
 To remove cover
 To remove rear panel
 To remove front panel
 To remove front panel
 To remove disk drive
 To remove CPU
 To remove Nvram
 To remove memory
 To remove power supply
 Replacing Assemblies
 To remove motherboard
 To remove motherboard
 To remove dc-dc converter
 Replaceable Parts
 Non-Listed Parts
Ordering Information
 Mfr No Mfr Name Address
Direct Mail Order System
Code Numbers
 Assemblies
 Agilent Part
 Agilent Part Qty Description Mfr Mfr Part Number Code
Cables
 Instrument Covers and Handles
 Assembly Covers and Brackets
 RFI STRIP-FINGERS BE-CU Bright DIP
Front Panel Parts
 Rear Panel Parts
 Chassis Parts
 Miscellaneous Parts
Screws, Washers, and Nuts
 Option UK4 Parts
 Replaceable Parts Agilent 35670A Option UK4 Parts
 Circuit Descriptions
 Overall Instrument Description
Circuit Descriptions
 Nvram
BNC
CPU
 Overall Instrument Description
Two Channel Overall Block Diagram
 Four Channel Overall Block Diagram
 A1 Input
 Agilent 35670A
 A1 Input Block Diagram Channel
 Agilent 35670A Circuit Descriptions A1 Input
 A1 Input Block Diagram Channel
 A1 Input Block Diagram Channel
 A2 Input
 A2 Input
 A2 Input Block Diagram Channel 1 or Channel
 Agilent 35670A Circuit Descriptions A2 Input
 A2 Input Block Diagram Channel 3 or Channel
 A2 Input Block Diagram Channel 3 or Channel
 A5 Analog
 A5 Analog Block Diagram ADC and Trigger
 Trigger-Level Input
 A5 Analog Block Diagram Analog Source and Calibrator
 A6 Digital
ADC timing and synchronization signals
 A6 Digital Block Diagram
 RAM
Fifo RAM
 A7 CPU
 A7 CPU Block Diagram
 A7 CPU Block Diagram Interface
 Reset Logic
 Disk Controller Display Controller Frame Memory
 Disk Utility
A8 Memory
 A8 Memory
 A9 Nvram
A9 Nvram Block Diagram
 DAC
A10 Rear Panel
 A10 Rear Panel Block Diagram
 A11 Keyboard Controller
A11 Keyboard Controller Block Diagram
 A12 BNC
 A15 Primary Keypad
A13 Primary Keypad
A14 Secondary Keypad
 A90 Fan
A98 Power Supply
 A100 Disk Drive
A99 Motherboard
A101 Display
A102 DC-DC Converter
 Option UK4 Microphone Adapter and Power Supply
 Option UK4 Microphone Adapter and Power Supply Block Diagram
Page
 Voltages and Signals
 Section Title Describes signals routed
Voltages and Signals
 Assembly Locations
Assembly Locations and Connections
 Assembly Connections for Two Channel Analyzer
 Assembly Connections for Four Channel Analyzer
 From Path Voltages
Power Supply Voltage Distribution
 A2 Input
A1 Input
 A7 J3 Pins A8 P1 Pins
 PA7
 Flashen
Memreset
G20MHZ
PRW
 SIZE0 SIZE1
 A9 Nvram
 Vbatt
 ATN
A10 Rear Panel
 DIO1 DIO8
Serial Port
DSR
DTR
 Select
Parallel Port
Busy
 Source Output
DIN Keyboard
Tachometer Input
External Trigger Input
 A11 Keyboard Controller
 A11 Keyboard Controller assembly
 A12 BNC
 Chanb COL0 COL7
Signal Name A11 Location
Chana
 ROW0 ROW6
Voltages and Signals Agilent 35670A A13 Primary Keypad
 Pwrfw
COL0 COL2
ROW0 ROW5
 A22 BNC
 Signal Name Assembly Using Signal
 A99 Motherboard
 23A
 A99 Motherboard
 Addata
A10MHZ
B5MHZ
Btach
 FAN+
Extrgin
Fanful
Fanoff
 H20MHZ
H10MHZ
Hsync
Imode
 Prefs
Lpfclk
Pvalid
RRW
 Srcdata
Srcclock
Syscntr
Trigger
 A100 Disk Drive
 Hdsel
DIR
SEL0 SEL1
Wdata
 Vsyncel
Vclk
VID
 Pins A7 P2 A102
Page
 Internal Test Descriptions
 High-level Subtests
Power-on Test Description
Low-level Subtests
 Binary to Hexadecimal
Power-on Test Messages
 Assembly/Sub-block Hexadecimal Message Code
Power-on Test Messages
 Calibration Routine Description
 DC-Offset Tables and Frequency Correction Curves
 Viewing the Calibration Correction Curves
Calibration Error Messages
 Active Trace
Disp Format
Active Trace Scale
 Bootrom
Fault Log Messages
 Self-Test Descriptions
 Functional Tests All Self-Test Group
Assembly Softkey Self Test Name A12 A10 A11 A100 A22
 Self Test Front Panel Softkey
Self Tests that Perform a Measurement
 Dgtl Srce Thru
Individual Self-Test Descriptions
 Fast BUS
 Long Conf Test
 Random Seek
 Serial Port
 Self Test Gpib Command
Self-Test Menu Map and Gpib Commands
 Self Test Functionl Tests Digital Processor Trigger
Page
 Backdating
 Backdating
 Quick Reference
 Quick Reference
 12-3
 Quick Reference Agilent 35670A
 12-5
 Quick Reference
 12-7
 12-8
 12-9
 12-10
 12-11
 12-12
 12-13
 A2 Input Block Diagram Channel 2 or Channel
 12-15
 12-16
 12-17
 12-18
 12-19
 12-20
 121 12-21
 A8 Memory Block Diagram
 12-23
 12-24
 12-25
 12-26
 Index
Cleaning the screen
 10-14
9-34
Cross talk test
 Troubleshooting four channels Installation
Controller Self-test description 10-14 Signals 8-29
10-9
10-15
 Phone assistance
 10-12
10-17
10-10 10-16
10-18
 Zoom self test
 If you are thinking about You want to Then read
Guide to Agilent 35670A Documentation
 Need Assistance?
 About this edition