Agilent Technologies 33250A Manuale utente

Agilent 33250A

80 MHz Function /

Arbitrary Waveform Generator

Service Guide

Publication Number 33250-90011 (order as 33250-90100 manual set)

Edition 2, March 2003

©Copyright Agilent Technologies, Inc. 2000, 2003

For Safety information, Warranties, and Regulatory information,

see the pages following the Index.

Agilent 33250A at a Glance

The Agilent Technologies 33250A is a high-performance 80 MHz

synthesized function generator with built-in arbitrary waveform and

pulse capabilities. Its combination of bench-top and system features

makes this function generator a versatile solution for your testing

requirements now and in the future.

Convenient bench-top features

• 10 standard waveforms

• Built-in 12-bit 200 MSa/s arbitrary waveform capability

• Precise pulse waveform capabilities with adjustable edge time

• LCD color display provides numeric and graphical views

• Easy-to-use knob and numeric keypad

• Instrument state storage with user-defined names

• Portable, ruggedized case with non-skid feet

Flexible system features

• Four downloadable 64K-point arbitrary waveform memories

• GPIB (IEEE-488) interface and RS-232 interface are standard

• SCPI (Standard Commands for Programmable Instruments) compatibility

Note: Unless otherwise indicated, this manual applies to all Serial Numbers.

The Front Panel at a Glance

Note: To get context-sensitive help on any front-panel key or menu softkey,

press and hold down that key.

1Graph Mode/Local Key

2Menu Operation Softkeys

3Waveform Selection Keys

4Knob

5Modulation/Sweep/Burst Menus

6State Storage Menu

7Utility Menu

8Instrument Help Topic Menu

9Output Enable/Disable Key

10 Manual Trigger Key (used for

Sweep and Burst only)

Cursor Keys

The Front-Panel Display at a Glance

Menu Mode

Trigger Output

Mode

Numeric

Readout

Information Information Status

Units

Display

Icon

Softkey Labels

Graph Mode

To enter the Graph Mode, press the key.

The softkey colors correspond

to the waveform parameters.

Signal

Ground

Parameter

Name

Parameter

Value

Front-Panel Number Entry

You can enter numbers from the front-panel using one of two methods.

Use the knob and arrow keys to modify the displayed number.

Use the numeric keypad and menu softkeys to select the units.

The Rear Panel at a Glance

WARNING For protection from electrical shock, the power cord ground must not be

defeated. If only a two-contact electrical outlet is available, connect the

instrument’s chassis ground screw (see above) to a good earth ground.

External 10 MHz Reference Input Terminal

Internal 10 MHz Reference Output Terminal

3RS-232 Interface Connector

4External Modulation Input Terminal

Input: External Trig/FSK/Burst Gate

Output: Trigger Output

6GPIB Interface Connector

7Chassis Ground

Use the menu to:

• Select the GPIB or RS-232 interface (see chapter 2 in User’s Guide).

• Select the GPIB address (see chapter 2 in User’s Guide).

• Set the RS-232 baud rate, parity, and handshake (see chapter 2 in User’s Guide).

In This Book

Specifications Chapter 1 lists the function generator’s specifications.

Quick Start Chapter 2 prepares the function generator for use and

helps you get familiar with a few of its front-panel features.

Front-Panel Menu Operation Chapter 3 introduces you to the front-

panel menu and describes some of the function generator’s menu features.

Calibration Procedures Chapter 4 provides calibration, verification,

and adjustment procedures for the function generator.

Theory of Operation Chapter 5 describes the block diagram and

circuit-level theory related to the operation of the function generator.

Service Chapter 6 provides guidelines for returning your function

generator to Agilent Technologies for servicing, or for servicing it

yourself.

Replaceable Parts Chapter 7 contains a detailed parts list of the

function generator.

Backdating Chapter 8 describes the differences between this manual

and older issues of this manual.

Schematics Chapter 9 contains the function generator’s schematics

and component locator drawings.

If you have questions relating to the operation of the Agilent 33250A,

call 1-800-452-4844 in the United States, or contact your nearest Agilent

Technologies Office.

If your 33250A fails within three years of purchase, Agilent will either

repair or replace it free of charge. Call 1-877-447-7278 in the United

States (and ask for “Agilent Express”) or contact your local Agilent

Technologies Office.

Contents

Chapter 1 Specifications 13

Chapter 2 Quick Start

To Prepare the Function Generator for Use 21

To Adjust the Carrying Handle 22

To Set the Output Frequency 23

To Set the Output Amplitude 24

To Set a DC Offset Voltage 26

To Set the Duty Cycle 27

To Configure a Pulse Waveform 28

To View a Waveform Graph 29

To Output a Stored Arbitrary Waveform 30

To Use the Built-In Help System 31

To Rack Mount the Function Generator 33

Chapter 3 Front-Panel Menu Operation

Front-Panel Menu Reference 37

To Reset the Function Generator 39

To Select the Output Termination 39

To Read the Calibration Information 40

To Unsecure and Secure for Calibration 41

To Store the Instrument State 44

To Configure the Remote Interface 45

Chapter 4 Calibration Procedures

Agilent Technologies Calibration Services 49

Calibration Interval 50

Adjustment is Recommended 50

Time Required for Calibration 51

Automating Calibration Procedures 52

Recommended Test Equipment 53

Test Considerations 54

Performance Verification Tests 55

Internal Timebase Verification 60

AC Amplitude (high-impedance) Verification 61

Low Frequency Flatness Verification 62

0 dB Range Flatness Verification 63

+10 dB Range Flatness Verification 65

+20 dB Range Flatness Verification 66

Contents

Chapter 4 Calibration Procedures (continued)

Calibration Security 68

Calibration Message 70

Calibration Count 70

General Calibration/Adjustment Procedure 71

Aborting a Calibration in Progress 72

Sequence of Adjustments 72

Self-Test 73

Frequency (Internal Timebase) Adjustment 74

Internal ADC Adjustment 75

Output Impedance Adjustment 76

AC Amplitude (high-impedance) Adjustment 78

Low Frequency Flatness Adjustment 80

0 dB Range Flatness Adjustments 81

+10 dB Range Flatness Adjustments 83

+20 dB Range Flatness Adjustment 85

Pulse Width (Trailing Edge Delay) Adjustment 87

Pulse Edge Time Adjustment 88

Duty Cycle Adjustment 89

Output Amplifier Adjustment (Optional) 90

Calibration Errors 91

Chapter 5 Theory of Operation

Block Diagram 95

Main Power Supply 97

On-Board Power Supplies 98

Waveform DAC and Filters 100

Digital Waveform, Pulse, and Sync 101

Digital Waveform Translator 104

Amplitude Multiplier 106

Main Output Circuitry 107

System ADC 110

System DAC 112

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