Agilent 33250A Service Guide

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Service Guide

Publication Number 33250-90011 (order as 33250-90100 manual set) Edition 2, March 2003

For Safety information, Warranties, and Regulatory information, see the pages following the Index.

Agilent 33250A 80 MHz Function / Arbitrary Waveform Generator

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

1 Graph Mode/Local Key 2 Menu Operation Softkeys 3 Waveform Selection Keys 4 Knob 5 Modulation/Sweep/Burst Menus 6 State Storage Menu

Note: To get context-sensitive help on any front-panel key or menu softkey, press and hold down that key.

7 Utility Menu 8 Instrument Help Topic Menu 9 Output Enable/Disable Key

10 Manual Trigger Key (used for

Sweep and Burst only)

Cursor Keys

The Front-Panel Display at a Glance

Menu Mode

Numeric Readout

Mode

Information

Trigger

Information

Softkey Labels

Units

Output

Status

Graph Mode

To enter the Graph Mode, press the key.

Parameter

Name

Parameter

Value

Display Icon

Signal Ground

The softkey colors correspond

to the waveform parameters.

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

External 10 MHz Reference Input Terminal

Internal 10 MHz Reference Output Terminal

3 RS-232 Interface Connector 4 External Modulation Input Terminal

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).

Input: External Trig/FSK/ Burst Gate Output: Trigger Output

6 GPIB Interface Connector 7 Chassis Ground

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.

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 frontpanel 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.

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

Contents

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

Contents

Chapter 5 Theory of Operation (continued)

Synthesis IC 113 Timebase 115 Phase Locked Loops 116 Clock Divider 118 Trigger and Delay 120 Waveform RAM 122 Synchronous Multiplexer 123 Main Processor 124 Main Gate Array 125 DSP and Gateway 126 Earth-Referenced Logic 126 Front Panel 127

Chapter 6 Service

Operating Checklist 130 Types of Service Available 131 Repackaging for Shipment 132 Cleaning 132 Electrostatic Discharge (ESD) Precautions 133 Surface Mount Repair 133 Troubleshooting Hints 134 Self-Test Procedures 136 Disassembly 140

Contents

Chapter 7 Replaceable Parts

33250-66511 Main PC Assembly (A1) 153 33205-66502 Front-Panel PC Assembly (A2) 176 33250A Chassis Assembly 177 33250A Front-Panel Assembly 178 Manufacturer’s List 179

Chapter 8 Backdating 181

Contents

Chapter 9 Schematics

A1 Earth Referenced Communications Schematic 185 A1 Main Processor Schematic 186 A1 Main Gate Array Schematic 187 A1 Display Controller Schematic 188 A1 DSP Schematic 189 A1 Modulation Schematic 190 A1 System DAC Schematic 191 A1 Timebase Schematic 192 A1 Phase-Locked Loops Schematic 193 A1 Trigger Schematic 194 A1 Clock Divider and Control Schematic 195 A1 Synthesis IC Schematic 196 A1 Waveform Memory Schematic 197 A1 Synchronous Multiplexer Schematic 198 A1 Digital Waveform and Sync Schematic 199 A1 Variable-Edge Level Translation Schematic 200 A1 Waveform DAC, Filters, and Comparator Schematic 201 A1 Multiplier Schematic 202 A1 Main Output Circuitry Schematic 203 A1 Power Supply Schematic 204 A2 Keyboard Schematic 205 A2 Display Schematic 206 A1 Component Locator (top) 207 A1 Component Locator (bottom) 208 A2 Component Locator (top) 209 A2 Component Locator (bottom) 210

Specifications

Chapter 1 Specifications

Agilent 33250A Function / Arbitrary Waveform Generator

WAVEFORMS

Standard Waveforms: Sine, Square, Ramp,

Arbitrary Waveforms

Waveform Length: 1 to 64K points Amplitude Resolution: 12 bits (including sign) Repetition Rate: 1 µHz to 25 MHz Sample Rate: 200 MSa/s Filter Bandwidth: 50 MHz Non-Volatile Memory:

Pulse, Noise, Sin(x)/x, Exponential Rise, Exponential Fall, Negative Ramp, Cardiac, DC Volts

Four 64K waveforms

FREQUENCY CHARACTERISTICS

Sine: 1 µHz to 80 MHz Square: 1 µHz to 80 MHz Ramp: 1 µHz to 1 MHz Pulse: 500 µHz to 50 MHz Noise (Gaussian): 50 MHz bandwidth Arb: 1 µHz to 25 MHz

Resolution: 1 µHz;

Accuracy (1 year):

except pulse, 5 digits

2 ppm, 18°C to 28°C 3 ppm, 0°C to 55°C

SINEWAVE SPECTRAL PURITY

Harmonic Distortion

< 3 Vpp

DC to 1 MHz: 1 MHz to 5 MHz: 5 MHz to 80 MHz:

-60 dBc

-57 dBc

-37 dBc

> 3 Vpp

-55 dBc

-45 dBc

-30 dBc

SIGNAL CHARACTERISTICS

Square Wave

Rise / Fall Time: < 8 ns Overshoot: < 5% Asymmetry: 1% of period + 1 ns Jitter (rms)

< 2 MHz: 0.01% + 525 ps > 2 MHz: 0.1% + 75 ps

Duty Cycle

< 25 MHz: 20.0% to 80.0% 25 MHz to 50 MHz: 40.0% to 60.0% 50 MHz to 80 MHz: 50.0% (fixed)

Pulse

Period: 20.00 ns to 2000.0 s Pulse Width: 8.0 ns to 1999.9 s Variable Edge Time: 5.00 ns to 1.00 ms Overshoot: < 5% Jitter (rms): 100 ppm + 50 ps

Ramp

Linearity: < 0.1% of peak output Symmetry: 0.0% to 100.0%

Arb

Minimum Edge Time: < 10 ns Linearity: < 0.1% of peak output Settling Time: < 50 ns to 0.5% of

Jitter (rms): 30 ppm + 2.5 ns

final value

Total Harmonic Distortion

DC to 20 kHz: < 0.2% + 0.1 mVrms

Spurious (non-harmonic)

DC to 1 MHz: -60 dBc 1 MHz to 20 MHz: -50 dBc 20 MHz to 80 MHz: -50 dBc + 6 dBc/octave

Phase Noise (30 kHz band)

10 MHz < -65 dBc (typical) 80 MHz < -47 dBc (typical)

_______________

A total of four waveforms can be stored.

Harmonic distortion at low amplitudes is limited by a -70 dBm floor.

Spurious noise at low amplitudes is limited by a -75 dBm floor.

Edge time decreased at higher frequency.

Chapter 1 Specifications

Agilent 33250A Function /Arbitrary Waveform Generator

OUTPUT CHARACTERISTICS

Amplitude (into 50Ω): 10 mVpp to 10 Vpp

Accuracy (at 1 kHz, >10 mVpp, Autorange On):

± 1% of setting ±1 mVpp

Flatness (sinewave relative to 1 kHz, Autorange On)

< 10 MHz: ± 1% (0.1 dB) 10 MHz to 50 MHz: ± 2% (0.2 dB) 50 MHz to 80 MHz ± 5% (0.4 dB)

Units: Vpp, Vrms, dBm,

Resolution: 0.1 mV or 4 digits

Offset (into 50Ω): ± 5 Vpk ac + dc

Accuracy: 1% of setting + 2 mV

Waveform Output

Impedance: 50Ω typical (fixed)

Isolation: 42 Vpk max. to Earth Protection:

High Level, Low Level

+ 0.5% of amplitude

>10 MΩ (output disabled)

Short-circuit protected Overload relay automatically disables main output

MODULATION CHARACTERISTICS

AM Modulation

Carrier Waveforms: Modulating Waveforms:

Modulating Frequency: 2 mHz to 20 kHz Depth: 0.0% to 120.0% Source: Internal / External

Sine, Square, Ramp, Arb Sine, Square, Ramp, Noise, Arb

BURST

Waveforms:

Frequency: 1 µHz to 80 MHz Burst Count: 1 to 1,000,000 cycles,

Start / Stop Phase: -360 Internal Period: 1 ms to 500 s Gate Source: External Trigger Trigger Source: Single, External, or

Trigger Delay

N-Cycle, Infinite: 0.0 ns to 85.000 s

Sine, Square, Ramp, Pulse, Noise, Arb

or Infinite

.0° to

Internal Rate

SWEEP

Waveforms: Type: Linear or Logarithmic Direction: Up or Down Start F / Stop F: 100 µHz to 80 MHz

;

Sweep Time: 1 ms to 500 s Trigger: Single, External, or

Marker: Falling edge of Sync

Sine, Square, Ramp, Arb

Internal

signal (programmable)

+360.0

FM Modulation

Carrier Waveforms: Modulating Waveforms:

Modulating Frequency: 2 mHz to 20 kHz Peak Deviation: DC to 80 MHz Source: Internal / External

FSK

Carrier Waveforms: Modulating Waveforms: 50% duty cycle square Internal Rate: 2 mHz to 100 kHz Frequency Range: 1 µHz to 80 MHz Source: Internal / External

External Modulation Input

Voltage Range: ± 5V full scale Input Impedance: 10 kΩ Frequency: DC to 20 kHz

Sine, Square, Ramp, Arb Sine, Square, Ramp, Noise, Arb

Sine, Square, Ramp, Arb

_______________

Add 1/10th of output amplitude and offset specification per °C for operation outside of 18 °C to 28 °C range (1-year specification).

20 mVpp to 20 Vpp into open-circuit load.

dB rounded to 1 digit. Instrument adheres to “% ” specification.

Short-circuit protected to ground at all times.

Sine and square waveforms above 25 MHz are allowed only with an “Infinite” burst count.

Chapter 1 Specifications

Agilent 33250A Function / Arbitrary Waveform Generator

SYSTEM CHARACTERISTICS

Configuration TImes (typical)

Function Change

Standard: Pulse: 660 ms

Built-In Arb: Frequency Change: 24 ms Amplitude Change: 50 ms Offset Change: 50 ms Select User Arb: Modulation Change: < 200 ms

Arb Download Times GPIB / RS-232 (115 Kbps)

Arb Length Binary ASCII Integer ASCII Real

64K points 23 sec 92 sec 154 sec 16K points 6 sec 23 sec 39 sec

8K points 3 sec 12 sec 20 sec 4K points 1.5 sec 6 sec 10 sec 2K points 0.75 sec 3 sec 5 sec

102 ms

240 ms

< 400 ms for < 16K points

TRIGGER CHARACTERISTICS

Trigger Input

Input Level: TTL-compatible Slope: Rising or falling

Pulse Width: > 100 ns Input Impedance: 10 kΩ, DC coupled Latency

Sweep: < 10 µs (typical)

Burst: < 100 ns (typical) Jitter (rms)

Sweep: 2.5 µs

Burst: 1 ns;

Trigger Output

Level: Pulse Width: > 450 ns Maximum Rate: 1 MHz Fanout: < 4 Agilent 33250As

(selectable)

except pulse, 300 ps

TTL-compatible into 50

CLOCK REFERENCE

Phase Offset

Range: -360 Resolution: 0.001

External Reference Input

Lock Range: 10 MHz ± 35 kHz Level: 100 mVpp to 5 Vpp Impedance: Lock Time: < 2 s

Internal Reference Output

Frequency: 10 MHz

Level: 632 mVpp (0 dBm),

Impedance:

° to

1 kΩ nominal, ac coupled

nominal 50Ω nominal, ac coupled

SYNC OUTPUT

Level: TTL-compatible

Impedance: 50Ω nominal

_______________

Time to change parameter and output new signal.

Ω

Modulation or sweep off.

Times for 5-digit integer and 12-digit real numbers.

into > 1 kΩ

+360

Agilent 33250A Function /Arbitrary Waveform Generator

GENERAL SPECIFICATIONS

Power Supply: 100-240 V (±10%)

Power Consumption: 140 VA

Operating Environment:

Operating Altitude: 3000 meters

Pollution Degree: Indoor or Sheltered Use,

Storage Temperature:

Stored States: Four (4) named user

Power-On State: Default or Last

for 50-60 Hz operation, 100-127 V (±10%) for 50-400 Hz operation. IEC 60664 CAT II

0 °C to

°C

80% R.H. to 40 °C

IEC 60664 Degree 2

-30 °C to

configurations

Chapter 1 Specifications

Safety Designed to:

EMC Tested to:

Acoustic Noise: 40 dBA

Warm-Up Time: 1 hour

Calibration Interval: 1 year

Warranty: 3 years standard

Accessories Included:

IEC-61326-1

EN61010-1, CSA1010.1 UL-3111-1

IEC-61000-4-3 criteria B IEC-61000-4-6 criteria B

User’s Guide, Service Guide, Quick Reference Test Data, Connectivity Software, RS-232 Cable, Power Cord

Guide,

Interface: IEEE-488 and RS-232

standard

Language: SCPI-1997, IEEE-488.2

Dimensions (WxHxD)

Bench Top: 254 x 104 x 374 mm Rack Mount: 213 x 89 x 348 mm

Weight: 4.6 kg

_______________

Radiated and conducted immunity testing: When the product is tested at 3 V/m according to IEC/EN 61000-4-3:1995 or tested at 3 Vrms according to IEC/EN 61000-4-6:1996, the product may not meet criteria A, but does meet criteria B.

This ISM device complies with Canadian ICES-001.

Cet appareil ISM est conforme à la norme NMB-001 du Canada.

N10149

Chapter 1 Specifications

Agilent 33250A Function / Arbitrary Waveform Generator

PRODUCT DIMENSIONS

103.6 mm

254.4 mm

88.5 mm

216.6 mm 348.3 mm

374.0 mm

All dimensions are shown in millimeters.

Quick Start

One of the first things you will want to do with your function generator is to become acquainted with the front panel. We have written the exercises in this chapter to prepare the instrument for use and help you get familiar with some of its front-panel operations. This chapter is divided into the following sections:

• To Prepare the Function Generator for Use, on page 21

• To Adjust the Carrying Handle, on page 22

• To Set the Output Frequency, on page 23

• To Set the Output Amplitude, on page 24

• To Set a DC Offset Voltage, on page 26

• To Set the Duty Cycle, on page 27

• To Configure a Pulse Waveform, on page 28

• To View a Waveform Graph, on page 29

• To Output a Stored Arbitrary Waveform, on page 30

• To Use the Built-In Help System, on page 31

• To Rack Mount the Function Generator, on page 33

Chapter 2 Quick Start

Power Switch

To Prepare the Function Generator for Use

1 Check the list of supplied items.

Verify that you have received the following items with your instrument. If anything is missing, please contact your nearest Agilent Sales Office.

❑ One power cord.

❑ One User’s Guide.

❑ This Service Guide.

❑ One folded Quick Reference Guide.

❑ Certificate of Calibration.

❑ Connectivity software on CD-ROM.

❑ One RS-232 cable.

2 Connect the power cord and turn on the function generator.

Several power-on information messages are displayed after the function generator performs its power-on self-test. The GPIB address is displayed. The function generator powers up in the sine wave function at 1 kHz with an amplitude of 100 mV peak-to-peak (into a 50Ω termination). At power-on, the Output connector is disabled. To enable the Output connector, press the key.

If the function generator does not turn on, verify that the power cord is firmly connected to the power receptacle on the rear panel (the powerline voltage is automatically sensed at power-on). You should also make sure that the function generator is connected to a power source that is energized. Then, verify that the function generator is turned on.

If you need further assistance, refer to chapter 6 for instructions on returning the function generator to Agilent for service.

Chapter 2 Quick Start

To Adjust the Carrying Handle

To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the desired position.

Bench-top viewing positions Carrying position

To Set the Output Frequency

Chapter 2 Quick Start

To Set the Output Frequency

At power-on, the function generator outputs a sine wave at 1 kHz with an amplitude of 100 mV peak-to-peak (into a 50Ω termination). The following steps show you how to change the frequency to 1.2 MHz.

1Press the “Freq” softkey.

The displayed frequency is either the power-on value or the frequency previously selected. When you change functions, the same frequency is used if the present value is valid for the new function. To set the waveform period instead, press the Freq softkey again to toggle to the Period softkey (the current selection is highlighted).

2 Enter the magnitude of the desired frequency.

Using the numeric keypad, enter the value “1.2”.

3 Select the desired units.

Press the softkey that corresponds to the desired units. When you select the units, the function generator outputs a waveform with the displayed frequency (if the output is enabled). For this example, press MHz

Note: You can also enter the desired value using the knob and arrow keys.

Chapter 2 Quick Start

To Set the Output Amplitude

At power-on, the function generator outputs a sine wave with an amplitude of 100 mV peak-to-peak (into a 50Ω termination).

The following steps show you how to change the amplitude to 50 mVrms.

1Press the “Ampl” softkey.

The displayed amplitude is either the power-on value or the amplitude previously selected. When you change functions, the same amplitude is used if the present value is valid for the new function. To set the amplitude using a high level and low level, press the Ampl softkey again to toggle to the HiLevel and LoLevel softkeys (the current selection is highlighted).

2 Enter the magnitude of the desired amplitude.

Using the numeric keypad, enter the value “50”.

3 Select the desired units.

Press the softkey that corresponds to the desired units. When you select the units, the function generator outputs the waveform with the displayed amplitude (if the output is enabled). For this example, press mV

Note: You can also enter the desired value using the knob and arrow keys.

RMS

Chapter 2 Quick Start

To Set the Output Amplitude

You can easily convert the displayed amplitude from one unit to another. For example, the following steps show you how to convert the amplitude from Vrms to Vpp.

4 Enter the numeric entry mode.

Press the key to enter the numeric entry mode.

5 Select the new units.

Press the softkey that corresponds to the desired units. The displayed value is converted to the new units. For this example, press the Vpp softkey to convert 50 mVrms to its equivalent in volts peak-to-peak.

To change the displayed amplitude by decades, press the right-arrow key to move the cursor to the units on the right side of the display. Then, rotate the knob to increase or decrease the displayed amplitude by decades.

Chapter 2 Quick Start

To Set a DC Offset Voltage

At power-on, the function generator outputs a sine wave with a dc offset of 0 volts (into a 50Ω termination). The following steps show you how to

change the offset to –1.5 mVdc.

1Press the “Offset” softkey.

The displayed offset voltage is either the power-on value or the offset previously selected. When you change functions, the same offset is used if the present value is valid for the new function.

2 Enter the magnitude of the desired offset.

Using the numeric keypad, enter the value “–1.5”.

3 Select the desired units.

Press the softkey that corresponds to the desired units. When you select the units, the function generator outputs the waveform with the displayed offset (if the output is enabled). For this example, press mVdc.

Note: You can also enter the desired value using the knob and arrow keys.

Note: To select dc volts from the front panel, press and then select

the DC On softkey. Press the Offset softkey to enter the desired voltage level.

To Set the Duty Cycle

Chapter 2 Quick Start

To Set the Duty Cycle

Applies only to square waves. At power-on, the duty cycle for square waves if 50%. You can adjust the duty cycle from 20% to 80% for output frequencies up to 25 MHz. The following steps show you how to change

the duty cycle to 30%.

1 Select the square wave function.

Press the key and then set the desired output frequency to any value less than 25 MHz.

2Press the “Duty Cycle” softkey.

The displayed duty cycle is either the power-on value or the percentage previously selected. The duty cycle represents the amount of time per cycle that the square wave is at a high level (note the icon on the right side of the display).

3 Enter the desired duty cycle.

Using the numeric keypad or the knob, select a duty cycle value of “30”. The function generator adjusts the duty cycle immediately and outputs a square wave with the specified value (if the output is enabled).

Chapter 2 Quick Start

To Configure a Pulse Waveform

You can configure the function generator to output a pulse waveform with variable pulse width and edge time. The following steps show you

how to configure a 500 ms pulse waveform with a pulse width of 10 ms and edge times of 50 µs.

1 Select the pulse function.

Press the key to select the pulse function and output a pulse waveform with the default parameters.

2 Set the pulse period.

Press the Period softkey and then set the pulse period to 500 ms.

3 Set the pulse width.

Press the Pulse Width softkey and then set the pulse width to 10 ms. The pulse width represents the time from the 50% threshold of the rising edge to the 50% threshold of the next falling edge (note the display icon).

4 Set the edge time for both edges.

Press the Edge Time softkey and then set the edge time for both the rising and falling edges to 50 µs. The edge time represents the time from the 10% threshold to the 90% threshold of each edge (note the display icon).

To View a Waveform Graph

Chapter 2 Quick Start

To View a Waveform Graph

In the Graph Mode, you can view a graphical representation of the current waveform parameters. Each softkey parameter is shown in a different color corresponding to the lines above the softkeys at the bottom of the display. Note that the softkeys are listed in the same order as in the normal display mode.

1 Enable the Graph Mode.

Press the key to enable the Graph Mode. The name of the parameter currently selected is shown in the upper-left corner of the display and the

numeric value is highlighted.

2 Select the desired parameter.

To select a specific parameter, note the colored bars above the softkeys at the bottom of the display and select the corresponding color. For example, to select amplitude, press the softkey below the magenta-colored bar.

• As in the normal display mode, you can edit numbers using the numeric keypad or the knob and arrow keys.

• Parameters which normally toggle when you press a key a second time (e.g., Freq / Period) also toggle in the Graph Mode.

• To exit the Graph Mode, press again.

The key also serves as a key to restore front-panel control after remote interface operations.

Chapter 2 Quick Start

To Output a Stored Arbitrary Waveform

There are five built-in arbitrary waveforms stored in non-volatile memory.

The following steps show you how to output the built-in “exponential fall” waveform from the front panel.

1 Select the arbitrary waveform function.

When you press the key to select the arbitrary waveform function, a temporary message is displayed indicating which waveform is currently selected (the default is “exponential rise”).

2 Select the active waveform.

Press the Select Wform softkey and then press the Built-In softkey to select from the five built-in waveforms. Then press the Exp Fall softkey. The waveform is output using the present settings for frequency, amplitude, and offset unless you change them.

The selected waveform is now assigned to the key. Whenever you press this key, the selected arbitrary waveform is output. To quickly determine which arbitrary waveform is currently selected, press .

+ 181 hidden pages

Agilent 33250A Service Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Agilent 33250A at a Glance

The Front Panel at a Glance

The Front-Panel Display at a Glance

Front-Panel Number Entry

The Rear Panel at a Glance

In This Book

Contents

Quick Start

To Prepare the Function Generator for Use

To Adjust the Carrying Handle

To Set the Output Frequency

To Set the Output Amplitude

To Set a DC Offset Voltage

To Set the Duty Cycle

To Configure a Pulse Waveform

To View a Waveform Graph

To Output a Stored Arbitrary Waveform