Agilent 33220A Service Manual

Service Guide

For safety and warranty information see 

the page immediately after the schematics.

Publication Number 33220-90012 (order as 33220-90100 manual set) Edition 2, March 2005

Agilent 33220A 20 MHz Function/ Arbitrary Waveform Generator

Agilent 33220A at a Glance

The Agilent Technologies 33220A is a 20 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 14-bit 50 MSa/s arbitrary waveform capability

• Precise pulse waveform capabilities with adjustable edge time

• LCD 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), USB, and LAN remote interfaces 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 On/Off Switch 3 Modulation/Sweep/Burst Keys 4 State Storage Menu Key 5 Utility Menu Key 6 Help Menu Key 7 Menu Operation Softkeys 8 Waveform Selection Keys

9 Manual Trigger Key (used for

Sweep and Burst only)

10 Output Enable/Disable Key 11

Knob

Cursor Keys

Sync Connector

Output Connector

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

The Front-Panel Display at a Glance

Menu Mode

Numeric Readout

Mode

Information

Trigger

Information

Softkey Labels

Units

Output

Status

Graph Mode

To enter or exit the Graph Mode, press the key.

Parameter

Name

Parameter

Value

Display Icon

Signal

Ground

In Graph Mode, only one parameter label is displayed for each key at one time.

Front-Panel Number Entry

1. Use the keys below the knob to move the cursor left or right.

1. Key in a value as you would on a typical calculator.

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

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

2. Rotate the knob to change a digit (clockwise to increase).

Use the keypad to enter numbers and the softkeys to select units.

2. Select a unit to enter the value.

The Rear Panel at a Glance

External 10 MHz Reference Input Terminal (Option 001 only)

Internal 10 MHz Reference Output Terminal (Option 001 only)

3 External Modulation Input Terminal

Input: External Trig/ FSK / Burst Gate

Output: Trigger Output

. .

5 USB Interface Connector 6 LAN Interface Connecto r 7 GPIB Interface Connector 8 Chassis Ground

Use the menu to:

• Select the GPIB address (see chapter 3).

• Set the network parameter s for the LAN interface (see chapter 3).

• Display the current network parameters (see chapter 3).

Note: The External and Internal 10 MHz Reference Terminals (1 and 2, above) are present only if Option 001, External Timebase Reference, is installed. Otherwise, the holes for these connectors are plugged.

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

and adjustment procedures for the

Theory of Operation Chapter 5 describes block 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.

You can contact Agilent T echnologies at one of the following telephone numbers for warranty, service, or technical support information.

Chapter 4 provides calibration, verification,

function generator.

In the United States: (800) 829-4444 In Europe: 31 20 547 2111 In Japan: 0120-421-345

Or use our Web link for information on contacting Agilent worldwide.

www.agilent.com/find/assist

Or contact your Agilent Technologies Representative.

Chapter 1 Specifications 13 Chapter 2 Quick Start 19

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 High-Level and Low-Level Values 27 To Select “DC Volts” 28 To Set the Duty Cycle of a Square Wave 29 To Configure a Pulse Waveform 30 To View a Waveform Graph 31 To Output a Stored Arbitrary Waveform 32 To Use the Built-In Help System 33 To Rack Mount the Function Generator 35

Chapter 3 Front-Panel Menu Operation 37

Front-Panel Menu Reference 39 To Select the Output Termination 41 To Reset the Function Generator 41 To Read the Calibration Information 42 To Unsecure and Secure for Calibration 43 To Store the Instrument State 46 To Configure the Remote Int erface 47

Contents

Chapter 4 Calibration Procedures 53

Agilent Technologies Calibration Services 55 Calibration Interval 55 Adjustment is Recommended 55 Time Required for Calibration 56 Automating Calibration Procedures 57 Recommended Test Equipment 58 Test Considerations 59 Performance Verification Tests 60 Internal Timebase Verification 64 AC Amplitude (high-impedance) Verification 65 Low Frequency Flatness Verification 66 0 dB Range Flatness Verification 67 +10 dB Range Flatness Verification 69 +20 dB Range Flatness Verification 71 Calibration Security 73 Calibration Message 75 Calibration Count 75 General Calibration/Adjus tment Procedure 76 Aborting a Calibration in Progress 77 Sequence of Adjustments 77 Self-Test 78 Frequency (Internal Timebase) Adjustment 79 Internal ADC Adjustment 80 Output Impedance Adjustment 81 AC Amplitude (high-impedance) Adjustment 83 Low Frequency Flatness Adjustment 85 0 dB Range Flatness Adjustments 86 +10 dB Range Flatness Adjustments 88 +20 dB Range Flatness Adjustment 90 Calibration Errors 93

Chapter 5 Theory of Operation 95

Block Diagram 97 Power Supplies 100 Main Power Supply 100 Earth Referenced Power Supplies 101 Floating Power Supplies 102 Analog Circuitry 103 Waveform DAC and Filters 103 Squarewave Comparator 104 Square and P ulse Level Translator 104 Main Output Circuitry 106 System ADC 107 System DAC 108 Digital Circuitry 110 Synthesis IC and Waveform Memory 110 Timebase, Sync Output, and Relay Drivers 111 Main Processor 112 Front Panel 114 External Timebase (Option 001) 115

Contents

Chapter 6 Service 117

Operating Checklist 118 Types of Service Available 119 Repackaging for Shipment 120 Cleaning 120 Electrostatic Discharge (ESD) Precauti ons 121 Surface Mount Repair 121 Troubleshooting Hi nts 122 Self-Test Procedures 124 Disassembly 127

Chapter 7 Replaceable Parts 139

33220-66511 – Main PC Assembly 141 33220-66502 – Front-Panel PC Assembly 155 33220-66503 – External Timebase PC Assembly 156 33220A Chassis Assembly 158 Manufacturer List 159

Contents

Chapter 8 Backdating 161 Chapter 9 Schematics 163

A1 Clocks, IRQ, RAM, ROM, and USB Schematic 165 A1 Front Panel Interface, LAN, GPIB, and Beeper Schematic 166 A1 Cross Guard, Serial Communications, Non-Volatile Memory, and

Trigger Schematic 167 A1 Power Distribution Schematic 168 A1 Synthesis IC and Wa veform RAM Schematic 169 A1 Timebase, Sync, and Relay Drivers Schematic 170 A1 System ADC Schematic 171 A1 System DAC Schematic 172 A1 Waveform DAC and Filters and Square Wave Comparator Schematic

173 A1 Square / Pulse Level Translation Schematic 174 A1 Gain Switching and Output Amplifier Schematic 175 A1 Earth Referenced Power Supply Schematic 176 A1 Isolated Power Supply S chematic 177 A2 Keyboard Scanner and Display Connector Schematic 178 A2 Key Control Schematic 179 A3 External Timebase Schematic 180 A1 Component Locator (top) 181 A1 Component Locator (bottom) 182 A2 Compone nt Locator 183 A3 Compone nt Locator 184

Specifications

Chapter 1 Specificat ions

Agilent 33220A Function/Arbitrary Waveform Generator

Waveforms

Standard: Sine, Squa re, Ramp,

Built-in Arbitrary: Exponential rise,

Triangle, Pulse, Noise, DC

Exponential fall, Negative ramp, Sin(x)/x, Cardiac.

Waveform Characteristics

Sine

Frequency: 1 µHz to 20 MHz,

Amplitude Flatness:

< 100 kHz 0.1 dB

100 kHz to 5 MHz 0.15 dB

5 MHz to 20 MHz 0.3 dB

Harmonic Distortion:

DC to 20 kHz -70 dBc -70 dBc

20 kHz to 100 kH z -65 dBc -60 dBc

100 kHz to 1 MHz -50 dBc -45 dBc

1 MHz to 20 MHz -40 dBc -35 dBc

Total Harmonic Distortion: DC to 20 kHz 0.04%

Spurious (Non-Harmonic) Output: DC to 1 MHz -70 dBc

1 MHz to 20 MHz -70 dBc +6 dB/octave Phase Noise

(10 kHz offset): -115 dBc / Hz, typical

[1], [2]

[2], [3]

1 µHz resolution

(Relative to 1 kHz)

< 1 Vpp >

[2], [3]

[2], [4]

1 Vpp

Square

Frequency: 1 µHz to 20 MHz,

1 µHz resolution Rise/Fall Time: < 13 ns Overshoot: < 2% Variable Duty Cycle: 20% - 80% (to 10 MHz)

40% - 60% (to 20 MHz) Asymmetry (@ 50% Duty): 1% of period + 5 ns Jitter (RMS): 1 ns + 100 ppm of

period

Ramp, Triangle

Frequency: 1 µHz to 200 kHz,

1 µHz resolution Linearity: < 0.1% of peak output Variable Symmetry: 0.0% to 100.0%

Pulse

Frequency: 500 µHz to 5 MHz,

1 µHz resolution Pulse Width

(period < 10 s): 20 ns minimum,

10 ns resolution Variable Edge Time: < 13 ns to 100 ns

Overshoot: < 2% Jitter (RMS): 300 ps + 0.1 ppm of

period

Noise

Bandwidth: 10 MHz, typical

Arbitrary

Frequency: 1 µHz to 6 MHz,

1 µHz resolution Waveform Length: 2 to 64 K points Amplitude Resolution: 14 bits (including sign) Sample Rate: 50 MSa/s Minimum Rise/Fa ll Time: 35 ns, typical Linearity: < 0.1% of peak output Settling Time: < 250 ns to 0.5% of

final value Jitter (RMS): 6 ns + 30 ppm Non-volatile Memory: Four waveforms

Chapter 1 Specifications

Agilent 33220A Function /Arbitrary Waveform Generator

Common Characteristics

Amplitude

Range:

Into 50 Ω: 10 mVpp to 10 Vpp Into open circuit: 20 mVpp to 20 Vpp

Accuracy (at 1 kHz): Units: Vpp, Vrms, dBm

Resolution: 4 digits

DC Offset

Range (peak AC + DC): ± 5 V into 50 Ω

Accuracy: Resolution: 4 digits

[1], [2]

Main Output

Impedance: 50 Ω typical Isolation: 42 Vpk maximum to

Protection: S hort-circuit prot ected,

Internal Frequency Reference

Accuracy:

[5]

± 10 ppm in 90 days,

External Frequency Reference (Option 001)

Rear Panel Input:

Lock Range: 10 MHz ± 500 Hz Level: 100 mVpp to 5 Vpp Impedance: 1 kΩ typical, AC

Lock Time: < 2 seconds

Rear Panel Output:

Frequency: 10 MHz Level: 632 mVpp (0 dBm),

Impedance: 50 Ω typical, AC

[1], [2]

± 1% of setting

± 1 mVpp

±10 V into open circuit

± 2% of offset setting

± 0.5% of ampl. ± 2 mV

earth overload automatically

disables main output

± 20 ppm in 1 year

coupled

typical coupled

Phase Offset:

Range: +360 to -360 degrees Resolution: 0.001 degrees Accuracy: 20 ns

Modulation

Carrier Waveforms: Sine, Square, Ramp,

Arb Source: Internal/External Internal Modulation: Sine, Square, Ramp,

Triangle, Noise, Arb

(2 mHz to 20 kHz) Depth: 0.0% to 120.0%

Carrier Waveforms: Sine, Square, Ramp,

Arb Source: Internal/External Internal Modulation: Sine, Square, Ramp,

Triangle, Noise, Arb

(2 mHz to 20 kHz) Deviation: DC to 10 MHz

Carrier Waveforms: Sine, Square, Ramp,

Arb Source: Internal/External Internal Modulation: Sine, Square, Ramp,

Triangle, Noise, Arb

(2 mHz to 20 kHz) Deviation: 0.0 to 360.0 degrees

PWM

Carrier Waveforms : Pulse Source: Internal/External Internal Modulation: Sine, Square, Ramp,

Triangle, Noise, Arb

(2 mHz to 20 kHz) Deviation: 0% to 100% of pulse

width

Chapter 1 Specificat ions

Agilent 33220A Function/Arbitrary Waveform Generator

FSK

Carrier Waveforms: Sine, Square, Ramp, Source: Internal/External

Internal Modulation: 50% duty cycle square

External Modulation Input

Arb

(2 mHz to 100 kHz)

[6]

(for AM, FM, PM, PWM)

Voltage Range: ± 5 V full scale Input Resistance: 5 kΩ typical Bandwidth: DC to 20 kHz

Sweep

Waveforms: Sine, Square, Ramp, Type: Linear or Logarithmic

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

Marker Falling edge of Sync

Burst

Waveforms: Sine, Square, Ramp,

Type: Counted (1 to 50,000 Start/Stop Phas e: -360 to +360 degrees

Internal Period: 1 µs to 500 s Gate Source: External Trigger Trigger Source: Single, External, or

[7]

Arb

Internal signal (programmable

frequency)

Triangle, Pulse, Noise, Arb

cycles), Infinite, Gated

Internal

T rigger Cha rac teris ti cs

Trigger Input:

Input Level: TTL compatible Slope: Rising or falling,

Pulse Width: > 100 ns Input Impedance: > 10 kΩ, DC coupled Latency: < 500 ns Jitter (RMS) 6 ns (3.5 ns for Pulse)

Trigger Output:

Level: TTL compatible into Pulse Width: > 400 ns

Output Impedance: 50 Ω, typical Maximum Rate: 1 MHz Fanout: <

selectable

1 kΩ

4 Agilent 33220As

Programming Times (typical)

Configuration Times

USB 2.0

Function

Change

Frequency

Change

Amplitude

Change

Select User

Arb

111 m s 111 ms 111 ms

1.5 ms 2.7 ms 1.2 ms

30 ms 30 ms 30 ms

124 ms 124 ms 123 ms

Arb Download Times (binary transfer)

USB 2.0

64 K points 96.9 ms 191.7 ms 336.5 ms 16 K points 24.5 ms 48.4 ms 80.7 ms

4 K points 7.3 ms 14.6 ms 19.8 ms

Download times do not include setup or output time.

LAN

(VXI-11)

LAN

(VXI-11)

GPIB

Chapter 1 Specifications

Agilent 33220A Function /Arbitrary Waveform Generator

General

Power Supply: CAT II

100 to 240 V 50/60 Hz (-5%, +10%)

100 to 120 V @

400 Hz (± 10%) Power Consumption: 50 VA maximum Operating Environment: IEC 61010

Pollution Degree 2

Indoor Location Operating Temperature: 0 °C to 55 °C Operating Humidity: 5% to 80% RH,

non-condensing Operating Altitude: Up to 3000 meters Storage Temperature: -30 °C to 70 °C State Storage Memory: Power off state

automatically sav ed .

Four user-configurabl e

stored states. Interface: GPIB, USB, and LAN

standard Language: SCPI - 1993,

IEEE-488.2 Dimensions (W x H x D):

Bench T op: 261.1 mm by 103.8 mm

by 303.2 mm

Rack Mount: 212.8 mm by 88.3 mm

by 272.3 mm Weight: 3.4 kg (7.5 lbs) Safety Designed to: UL-1244, CSA 1010,

EN61010 EMC Tested to: MIL-461C, EN55011,

EN50082-1 Vibration and Shock: MIL-T-28800, Type III,

Class 5 Acoustic Noise: 30 dBa Warm-up Time: 1 hour

Note: Specifications are subject to change without notice. For the latest specifications, go to the Agilent 33220A product page and find the 33220A Datasheet.

www.agilent.com/find/33220A

This ISM device complie s w ith C ana di an ICES-001. Cet appareil ISM est conforme à la norme NMB-001

du Canada.

N10149

________________

Footnotes:

Add 1/10th of output amplitude and offset

specification per the range of 18

Autorange enabled.

DC offset set to 0 V.

Spurious output at low amplitude is

°C for operation outside

°C to 28 °C.

-75 dBm (typical).

Add 1 ppm / °C (average) for operation out-

side the range of 18

FSK uses trigger input (1 MHz maximum).

Sine and square waveforms above 6 MHz

°C to 28 °C.

are allowed only with an “infinite” burst count.

Product Dimensions

Chapter 1 Specifications

Agilent 33220A Function/Arbitrary Waveform Generator

All dimensions are shown in millimeters.

Quick Start

One of the first things yo u will want to do w ith your function ge nerator is to become acquainted with the fro nt panel. We have w ri tten 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 High-Level and Low-Level Values, on page 21

• To Select “DC Volts”, on page 22

• To Set the Duty Cycle of a Square Wave, on page 29

• To Configure a Pulse Waveform, on page 30

• To View a Waveform Graph, on page 31

• To Output a Stored Arbitrary Waveform, on page 32

• To Use the Built-In Help System, on page 33

• To Rack Mount the Function Generator, on page 35

Chapter 2 Quick Start

To Prepare the Function Generator for Use

Power Switch

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 Start Tutorial.  One folded Quick Reference Guide.  Certificate of Calibration.  Connectivity software on CD-ROM.  One USB 2.0 cable.

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

The instrument runs a short power-on self test, which takes a few seconds. When the instrument is ready for use it displays a message about how to obtain help, along with the current GPIB address. 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). the

Output

the key

connector

is disabled. To enable the Output

At power-on,

connector, press

If the function generator does not turn on, verify that the power cord is firmly connected to the power receptacle on the rear p a ne l (t he po w er -line 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 the power-on self test fails, “Self-T est Failed” is displayed along with an error code. See Chapter 6 for information on self-test error codes, and 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.

Retracted

Carrying

Position

Extended

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: Y keys.

ou can also enter the desired value using the knob and cursor

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 functio n ge ner ator out puts the wave form w ith the disp layed amplitude (if the output is enabled). For this example, press mV

Note: Y keys.

ou can also enter the desired value using the knob and cursor

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-cursor 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

T o Set a DC Offset Voltage

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 off set 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 functio n ge ner ator out puts the wave form w ith the disp layed offset (if the output is enabled). For this example, press mV

Note: Y keys.

ou can also enter the desired value using the knob and cursor

Chapter 2 Quick Start

To Set the High-Level and Low-Level Values

To Set the High-Level and Lo w-Level Values

You can specify a signal by setting its amplitude and dc offset values, as described previously. Another way to set the limits of a signal is to specify its high-level (maximum) and low-level (minimum) values. This is typically convenient for digital applications. In the following example, let's set the high-level to 1.0 V and the low-level to 0.0 V.

1 Press the "Ampl" softkey to select "Ampl".

2 Press the softkey again to toggle to "HiLevel".

Note that both the Ampl and Offset softkeys toggle together, to HiLevel and LoLevel, respectively.

3 Set the "HiLevel" value.

Using the numeric keypad or the knob, select a value of "1.0 V". (If you are using the keypad, you will need to select the unit, "V", to enter the value.)

4 Press the "LoLevel" softkey and set the value.

Again, use the numeric keyp ad or the knob to enter a value of "0.0 V".

Note that these settings (high-level = "1.0 V" and low-level = "0.0 V") are equivalent to setting an amplitude of "1.0 Vpp" and an offset of "500 mVdc".

Chapter 2 Quick Start

T o Select “DC Volts”

To Select “DC Volts”

You can select the "DC Volts" feature from the “Utility” menu, and then set a constant dc voltage as an "Offset" value. Let's set "DC Volts" = 1.0 Vdc.

1 Press and then select the DC On softkey.

The Offset value becomes selected.

2 Enter the desired voltage level as an "Offset".

Enter 1.0 Vdc with the numeric keypad or knob.

You can enter any dc voltage from -5 Vdc to +5 Vdc.

Chapter 2 Quick Start

T o Set the Duty Cycle of a Square Wave

To Set the Duty Cycle of a Square Wave

At power-on, the duty cycle for square waves is 50%. You can adjust th e duty cycle from 20% to 80% for output frequencies up to 10 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 up to 10 MHz.

2Press the “Duty Cycle” softkey.

The displayed duty cycle is either the power-on value or the percentage previously selected. Th e 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 cy cle immediately and outputs a square wave with the specified value (if the output is enabled).

Chapter 2 Quick Start

T o Configure a Pulse Waveform

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 ns.

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 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 ns. The edge time represents the time from the 10% threshold to the 90% threshold of each edge (note the display icon

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