Agilent 33210A Service Manual

Service Guide

Publication Number 33120-90017 (order as 33120-90104 manual set) Edition 6, March 2002

For Safety information, Warranties, and Regulatory information,

see the last page in this manual.

Agilent 33120A 15 MHz Function /

Arbitrary Waveform Generator

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

The Agilent Technologies 33120A is a high-performance 15 MHz synthesized function generator with built-in arbitrary waveform capability. 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 40 MSa/s arbitrary waveform capability

 Easy-to-use knob input

 Highly visible vacuum-fluorescent display

 Instrument state storage

 Portable, ruggedized case with non-skid feet

Flexible system features

Warning

 Four downloadable 16,000-point arbitrary waveform memories

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

 SCPI (Standard Commands for Programmable Instruments) compatibility

 Agilent IntuiLink Arb Waveform Generation Software for

Microsoft

The procedures in this manual are intended for use by qualified, service-trained personnel only.

Windows

Agilent 33120A 15 MHz Function /

Arbitrary Waveform Generator

The Front Panel at a Glance

1 Function / Modulation keys 2 Menu operation keys 3 Waveform mod ify keys 4 Single / Internal Trigger key

(Burst and Sweep only)

5 Recall / Store instrument state key 6 Enter Number key 7 Shift / Local key 8 Enter Number “units” keys

Front-Panel Number Entry

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

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

Use the arrow keys to edit individual digits.

Increments the flashing digit.

Decrements the flashing digit.

Moves the flashing digit

to the right.

to the left.

Use the “Enter Number” mode to enter a number with the appropriate units.

Use “Enter” for those operations that do not require units to be specified (AM Level, Offset, % Duty, and Store/Recall State).

The Front-Panel Menu at a Glance

The menu is organized in a top-down tree structure with three levels.

A: MODulation MENU

1: AM SHAPE Õ 2: AM SOURCE Õ 3: FM SHAPE Õ 4: BURST CNT Õ 5: BURST RATE Õ

Õ 6: BURST PHAS Õ 7: BURST SRC Õ 8: FSK FREQ Õ 9: FSK RATE Õ 10: FSK SRC

B: SWP (Sweep) MENU

1: START F Õ 2: STOP F Õ 3: SWP TIME Õ 4: SWP MODE

C: EDIT MENU

1: NEW ARB Õ [ 2: POINTS ] Õ [ 3: LINE EDIT ] Õ [ 4: POINT EDIT ] Õ [ 5: INVERT ] Õ [ 6: SAVE AS ] Õ 7: DELETE

The commands enclosed in square brackets ( [ ] ) are “hidden” until you make a selection from the

NEW ARB command to initiate a new edit session.

D: SYStem MENU

1: OUT TERM Õ 2: POWER ON Õ 3: ERROR Õ 4: TEST Õ 5: COMMA Õ 6: REVISION

E: Input / Output MENU

1: HPIB ADDR Õ 2: INTERFACE Õ 3: BAUD RATE Õ 4: PARITY Õ 5: LANGUAGE

F: CALibration MENU

1: SECURED or [ 1: UNSECURED ] Õ [ 2: CALIBRATE ] Õ 3: CAL COUNT Õ 4: MESSAGE

The commands enclosed in square brackets ( [ ] ) are “hidden” unless the function generator

is UNSECURED for calibration.

Display Annunciators

Adrs Rmt Trig AM FM Ext FSK Burst Swp

ERROR

Offset Shift Num Arb

Function generator is addressed to listen or talk over a remote interface. Function generator is in remote mode (remote interface). Function generator is waiting for a single trigger or external trigger (Burst, Sweep). AM modulation is enabled. FM modulation is enabled. Function generator is set for an external modulation source (AM, FSK, Burst). FSK (frequency-shift keying) modulation is enabled. Burst modulation is enabled. Sweep mode is enabled. Hardware or remote interface command errors are detected. The waveform is being output with an offset voltage. “Shift” key has been pressed. Press “Shift” again to turn off. “Enter Number” mode is enabled. Press “Shift-Cancel” to disable. Arbitrary waveform function is enabled. Sine waveform function is enabled. Square waveform function is enabled. Triangle waveform function is enabled. Ramp waveform function is enabled.

To review the display annunciators, hold down the Shift key as you turn on the function generator.

The Rear Panel at a Glance

1 Chassis ground 2 Power-line fuse-holder assembly 3 Power-line voltage setting

4 AM modulation input terminal

Use the front-panel Input / Output Menu to:

5 External Trigger / FSK / Burst modulation

input terminal

6 GPIB (IEEE-488) interface connector 7 RS-232 interface connector

 Select the GPIB or RS-232 interface (see chapter 4 in User’s Guide).  Set the GPIB bus address (see chapter 4 in User’s Guide). 

Set the RS-232 baud rate and parity (see chapter 4 in User’s Guide).

In This Book

Specifications Chapter 1 lists the function generator’s specifications and describes how to interpret these 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 block and circuit level theory related to the operation the function generator.

Service Chapter 6 provides guidelines for returning your function generator to Agilent for servicing, or for servicing it yourself.

Replaceable Parts Chapter 7 contains a detailed parts lists of the function generator.

Schematics Chapter 8 contains the function generator’s block diagram, schematics, disassembly drawings, and component locator drawings.

For information on using the Phase-Lock Option for the 33120A, refer to the User’s and Service Guide included with the Option 001.

If you have questions relating to the operation of the 33120A, call 1-800-452-4844 in the United States, or contact your nearest Agilent Technologies Sales Office.

If you believe your 33120A has failed, refer to “Operating Checklist”, “Types of Service Available”, and “Repackaging for Shipment” at the beginning of chapter 6.

Chapter 1 Specifications

Chapter 2 Quick Start

To prepare the function generator for use 21 If the function generator does not turn on 22 To adjust the carrying handle 24 To set the output frequency 25 To set the output amplitude 26 To set a dc offset voltage 27 To set the duty cycle 28 To output a stored arbitrary waveform 29 To output a dc voltage 30 To store the instrument state 31 To rack mount the function generator 33

Chapter 3 Front-Panel Menu Operation

Front-panel menu reference 37 A front-panel menu tutorial 39 To select the output termination 44 To output a modulated waveform 45 To unsecure the function generator for calibration 47

Contents

Chapter 4 Calibration Procedures

Agilent Calibration Services 51 Calibration Interval 51 Time Required for Calibration 51 Automating Calibration Procedures 52 Recommended Test Equipment 52 Test Considerations 53 Performance Verification Tests 54 Frequency Verification 56 Function Gain and Linearity Verification 56 DC Function Offset Verification 57 AC Amplitude Verification 57 Amplitude Flatness Verification 60 AM Modulation Depth Verification 61 Optional Performance Verification Tests 62

Contents

Chapter 4 Calibration Procedures (continued)

Calibration Security Code 64 Calibration Count 66 Calibration Message 66 General Calibration/Adjustment Procedure 67 Aborting a Calibration in Progress 69 Frequency and Burst Rate Adjustment 69 Function Gain and Linearity Adjustment 70 AC Amplitude Adjustment (High-Z) 70 Modulation Adjustment 72 AC Amplitude Adjustment (50 DC Output Adjustment 76 Duty Cycle Adjustment 77 AC Amplitude Flatness Adjustment 77 Output Amplifier Adjustment (Optional) 80 Error Messages 81

Chapter 5 Theory of Operation

Block Diagram Overview 85 Output Attenuator 86 Output Amplifier 87 AM Modulation 89 Pre-attenuator 90 Square Wave and Sync 90 Filters 92 Waveform DAC/Amplitude Leveling/Waveform RAM 93 Direct Digital Synthesis (DDS ASIC) 95 System DACs 96 Floating Logic 97 Earth-Referenced Logic 98 Power Supplies 98 Display and Keyboard 100

W) 73

Contents

Chapter 6 Service

Operating Checklist 103 Types of Service Available 104 Repackaging for Shipment 105 Cleaning 105 Electrostatic Discharge (ESD) Precautions 106 Surface Mount Repair 106 To Replace the Power-Line Fuse 107 To Replace the Output Protection Fuse (F801) 107 Troubleshooting Hints 108 Self-Test Procedures 110

Chapter 7 Replaceable Parts

Replaceable Parts 113

Chapter 8 Schematics

33120A Block Diagram 129 Mechanical Disassembly 130 Floating Logic Schematic 131 Digital Waveform Data Synthesis 132 System DAC Schematic 133 Waveform DAC Schematic 134 Filters Schematic 135 Sync, Square Wave, and Attenuator Schematic 136 Output Amplifier Schematic 137 Output Attenuator Schematic 138 Earth Reference Logic Schematic 139 Power Supplies Schematic 140 Display and Keyboard Schematic 141 33120-66521 Component Locator Diagram 142 33120-66502 Component Locator Diagram 143

Contents

Specifications

Chapter 1 Specifications

Agilent 33120A Function Generator

WAVEFORMS

Standard Waveforms:

Sine, Square, Triangle, Ramp, Noise, DC volts, Sine(x)/x, Negative Ramp, Exponential Rise, Exponential Fall, Cardiac

Arbitrary Waveforms:

Waveform Length: Amplitude Resolution: Sample Rate: Non-Volatile Memory:

8 to 16,000 points 12 bits (including sign) 40 MSa / sec Four 16,000-point waveforms

FREQUENCY CHARACTERISTICS

Sine: Square: Triangle: Ramp: Noise (Gaussian): Arbitrary Waveforms:

8 to 8,192 points: 8,193 to 12,287 points: 12,288 to 16,000 points:

Resolution:

Accuracy:

Temperature Coefficient:

Aging:

Hz – 15 MHz

100

Hz – 15 MHz

100

Hz – 100 kHz

100

Hz – 100 kHz

100 10 MHz bandwidth

Hz – 5 MHz

100

Hz – 2.5 MHz

100

Hz – 200 kHz

100

Hz or 10 digits

10 ppm in 90 days, 20 ppm in 1 year,



C – 28C

< 2 ppm /



< 10 ppm / yr

SINEWAVE SPECTRAL PURITY (into 50

SIGNAL CHARACTERISTICS

Squarewave

Rise/Fall Time: Overshoot: Asymmetry: Duty Cycle:

Triangle, Ramp, Arb

Rise/Fall Time: Linearity: Settling Time: Jitter:

OUTPUT CHARACTERISTICS

(4)

(3)

Amplitude (into 50 Accuracy (at 1 kHz): Flatness < 100 kHz: 100 kHz to 1 MHz: 1 MHz to 15 MHz: 1 MHz to 15 MHz:

Offset (into 50 Accuracy:

Output Impedance:

Resolution:

Output Units:

Isolation:

)

Protection:

< 20 ns < 4% 1% + 5 ns 20% to 80% (to 5 MHz) 40% to 60% (to 15 MHz)

40 ns (typical) < 0.1% of peak output < 250 ns to 0.5% of final value < 25 ns

(2)

50 mVpp – 10 Vpp



1% of specified output

(sine wave relative to 1 kHz)



1% (0.1 dB)



1.5% (0.15 dB)



2% (0.2 dB) Ampl  3Vrms



3.5% (0.3 dB) Ampl < 3Vrms



5 Vpk ac + dc



2% of setting + 2 mV

50 ohms fixed

3 digits, Amplitude and Offset

Vpp, Vrms, dBm

42 Vpk maximum to earth

Short-circuit protected



15 Vpk overdrive < 1 minute

(1)

Harmonic Distortion

DC to 20 kHz: 20 kHz to 100 kHz: 100 kHz to 1 MHz: 1 MHz to 15 MHz:

Total Harmonic Distortion

DC to 20 kHz:

Spurious (non-harmonic) Output (DC to 1 MHz): Output (> 1 MHz):

Phase Noise:

-70 dBc

-60 dBc

-45 dBc

-35 dBc

< 0.04%

< -65 dBc < -65 dBc + 6 dB/octave

< -55 dBc in a 30 kHz band

(1) Add 1/10th of output amplitude and offset specification



C for operation outside of 18C to 28C range

per (1-year specification).

(2) 100 mVpp – 20 Vpp amplitude into open-circuit load.



(3) Offset

2 X peak-to-peak amplitude.

(4) For square wave outputs, add 2% of output amplitude additional error.

Chapter 1 Specifications

Agilent 33120A Function Generator

MODULATION CHARACTERISTICS

AM Modulation Carrier -3 dB Freq:

Modulation: Frequency:

Depth: Source:

FM Modulation Modulation: Frequency:

Peak Deviation: Source:

Burst Modulation Carrier Frequency: Count: Start Phase: Internal Rate: Gate Source: Trigger Source:

FSK Modulation

Frequency Range:

Internal Rate: Source:

10 MHz (typical) Any internal waveform plus Arb 10 mHz to 20 kHz (

2.5 kHz, then decreases linearly



0.4% at upper limit)

to 0% to 120% Internal / External

Any internal waveform plus Arb 10 mHz to 10 kHz ( 600 Hz, then decreases linearly



0.8% at upper limit)

to 10 mHz to 15 MHz Internal Only

5 MHz max. 1 to 50,000 cycles, or Infinite



to +360

-360 10 mHz to 50 kHz 1% Internal or External Gate Single, External, or Internal Rate

10 mHz to 15 MHz ( 600 Hz, then decreases linearly



4% at upper limit)

to 10 mHz to 50 kHz Internal / External (1 MHz max.)



0.05% to



0.05% to





0.05% to

(1)

SYSTEM CHARACTERISTICS

Configuration Times

Function Change: Frequency Change: Amplitude Change: Offset Change: Select User Arb: Modulation Parameter Change:

Arb Download Times over GPIB:

Arb Length Binary ASCII Integer ASCII Real

16,000 points 8 sec 81 sec 100 sec 8,192 points 4 sec 42 sec 51 sec 4,096 points 2.5 sec 21 sec 26 sec 2,048 points 1.5 sec 11 sec 13 sec

Arb Download Times over RS-232 at 9600 Baud:

Arb Length Binary ASCII Integer ASCII Real

16,000 points 35 sec 101 sec 134 sec 8,192 points 18 sec 52 sec 69 sec 4,096 points 10 sec 27 sec 35 sec 2,048 points 6 sec 14 sec 18 sec

(3)

(2)

(3)

80 ms 30 ms 30 ms 10 ms 100 ms < 350 ms

(4)

(5)

(6)

FREQUENCY SWEEP

Type: Direction: Start F / Stop F: Time: Source:

Linear or Logarithmic Up or Down 10 mHz to 15 MHz 1 ms to 500 sec Single, External, or Internal

REAR-PANEL INPUTS

External AM Modulation:

External Trigger/FSK Burst Gate:

Latency: Jitter:

(1)



5 Vpk = 100% Modulation

Input Resistance

5 k

TTL (low true)

1.3 25 ns



0.1% (1) Trigger source ignored when External Gate is selected.

(2) Time to change parameter and output the new signal.

(3) Modulation or sweep off.

(4) Times for 5-digit and 12-digit numbers.

(5) For 4800 baud, multiply the download times by two; For 2400 baud, multiply the download times by four, etc.

(6) Time for 5-digit numbers. For 12-digit numbers, multiply the 5-digit numbers by two.

Chapter 1 Specifications

Agilent 33120A Function Generator

GENERAL SPECIFICATIONS

Power Supply:

(1)

Power-Line Frequency:

Power Installation:

Power Consumption:

Operating Environment:

Storage Environment:

State Storage Memory:

Dimensions (W x H x D)

Bench Top: Rack Mount:

Weight:

100V / 120V / 220V / 240V



10%

(switch selectable)

50 Hz to 60 Hz 400 Hz



10% and

10%. Automatically

sensed at power-on.

CAT II

50 VA peak (28 W average)



C to 55C

80% Relative Humidity to 40



Indoor or sheltered location

-40



C to 70C

Power-off state automatically saved. Three (3) UserConfigurable Stored States, Arbitrary waveforms stored separately.

254.4 mm x 103.6 mm x 374 mm

212.6 mm x 88.5 mm x 348.3 mm

4 kg (8.8 lbs)

Safety Designed to:

EMC:

Vibration and Shock:

Acoustic Noise:

Warm-Up Time:

Warranty:

Remote Interface:

Programming Language:

Accessories Included:

N10149

EN61010, CSA1010, UL-1244

EN61326, 1:1997 + 1A:1998

MIL-T-28800E, Type III, Class 5 (data on file)

30 dBa

1 hour

3 years standard

IEEE-488 and RS-232 standard

SCPI-1993, IEEE-488.2

User’s Guide, Service Guide, Quick Reference Card, IntuiLink Arb software, RS-232 cable, Test Report, and power cord.

(1) For 400 Hz operation at 120 Vac, use the 100 Vac line-voltage setting.

Chapter 1 Specifications

Agilent 33120A Function Generator

PRODUCT DIMENSIONS

TOP

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 its front panel. We have written the exercises in this chapter to prepare the function generator for use and help you get familiar with some of the front-panel operations.

The front panel has two rows of keys to select various functions and operations. Most keys have a shifted function printed in blue above the key. To perform a shifted function, press turn on). Then, press the key that has the desired label above it. For example, to select the

Shift AM (the shifted version of the key).

AM (amplitude modulation) function, press

Shift (the Shift annunciator will

If you accidentally press

Shift , just press it again to turn off the Shift

annunciator.

Most keys also have a number printed in green next to the key. To enable the number mode, press

Enter Number (the Num annunciator will turn on).

Then, press the keys that have the desired numbers printed next to them. For example, to select the number “10”, press (next to the

If you accidentally press off the

and Recall keys).

Enter Number , just press Shift Cancel to turn

Num annunciator.

Enter Number 1 0

Chapter 2 Quick Start

To prepare the function generator for use

The following steps help you verify that the function generator is ready for use.

1 Check the list of supplied items.

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

One power cord.

One RS-232 serial cable.

One User’s Guide.

This Service Guide.

One folded Quick Reference card.

Certificate of Calibration.

Agilent IntuiLink Arb Waveform Generation Software.

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

If the function generator does not turn on, see chapter 6 for troubleshooting information. The front-panel display will light up while the function generator performs its power-on self-test. The displayed. Notice that the function generator powers up in the sine wave function at 1 kHz with an amplitude of 100 mV peak-to-peak (into a 50 termination).

To review the power-on display with all annunciators turned on, hold down

3Perform a complete self test.

The complete self-test performs a more extensive series of tests than those performed at power-on. Hold down switch to turn on the function generator; hold down the key for more than 5 seconds. The self-test will begin when you release the key.

If the self-test is successful, “ If the self-test is not successful, “ annunciator turns on. See chapter 6 for instructions on returning the function generator to Agilent for service.

Shift as you turn on the function generator.

PASS” is displayed on the front panel.

FAIL” is displayed and the ERROR

GPIB bus address is

Shift as you press the Power

Chapter 2 Quick Start

If the function generator does not turn on

Use the following steps to help solve problems you might experience when turning on the function generator. If you need more help, see chapter 6 for instructions on returning the function generator to Agilent for service.

1 Verify that there is ac power to the function generator.

First, verify that the function generator’s Power switch is in the “On” position. Also, make sure that the power cord is firmly plugged into to the power module on the rear panel. You should also make sure that the power source you plugged the function generator into is energized.

2 Verify the power-line voltage setting.

The line voltage is set to the proper value for your country when the function generator is shipped from the factory. Change the voltage setting if it is not correct. The settings are: 100, 120, 220, or 240 Vac (for 230 Vac operation, use the 220 Vac setting).

See the next page if you need to change the line-voltage setting.

3 Verify that the power-line fuse is good.

The function generator is shipped from the factory with a 500 mAT fuse installed. This is the correct fuse for all line voltages.

See the next page if you need to change the power-line fuse.

To replace the 500 mAT fuse, order Agilent part number 2110-0458.

Chapter 2 Quick Start

If the function generator does not turn on

1 Remove the power cord. Remove the fuse-holder assembly from the rear panel.

3 Rotate the line-voltage selector until the

correct voltage appears in the window.

2 Remove the line-voltage selector from

the assembly.

Fuse: 500 mAT (for all line voltages) Part Number: 2110-0458

4 Replace the fuse-holder assembly in the rear panel.

100, 120, 220 (230), or 240 Vac

Verify that the correct line voltage is selected and the power-line fuse is good.

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

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 50

The following steps show you how to change the frequency to 1.2 MHz.

Freq 1 Enable the frequency modify mode.

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

1.000,000,0 KHz

W termination).

Enter Number 2 Enter the magnitude of the desired frequency.

1 2 . Notice that the Num annunciator turns on and “ENTER NUM” flashes on

the display, indicating that the number mode is enabled.

1.2

MHz m Vpp

To cancel the number mode, press

3 Set the units to the desired value.

Shift Cancel .

The units are selected using the arrow keys on the right side of the front panel. As soon as you select the units, the function generator outputs the waveform with the displayed frequency. To turn off the flashing digit,

move the cursor to the left of the display using the arrow keys.

1.200,000,0 MHz

You can also use the knob and arrow keys to enter a number.

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 50

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

Ampl 1 Enable the amplitude modify mode.

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

100.0 mVPP

W termination).

Enter Number 2 Enter the magnitude of the desired amplitude.

5 0 Notice that the Num annunciator turns on and “ENTER NUM” flashes on

the display, indicating that the number mode is enabled.

To cancel the number mode, press

Shift 3 Set the units to the desired value.

kHz m Vrms

The units are selected using the arrow keys on the right side of the front panel. As soon as you select the units, the function generator outputs the

Shift Cancel .

waveform with the displayed amplitude. To turn off the flashing digit, move the cursor to the left of the display using the arrow keys.

50.00 mVRMS

You can also use the knob and arrow keys to enter a number.

Chapter 2 Quick Start

To set a dc offset voltage

At power-on, the function generator outputs a sine wave with a dc offset voltage of 0 volts (into a 50 how to change the offset to –1.5 mVdc.

Offset 1 Enable the offset modify mode.

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

+0.000 VDC

W termination). The following steps show you

Enter Number 2 Enter the magnitude of the desired offset.

1 . 5 Notice that the Num annunciator turns on and “ENTER NUM” flashes on



the display, indicating that the number mode is enabled. Notice that toggles the displayed value between + and – .

-1.5

To cancel the number mode, press

Shift 3 Set the units to the desired value.

kHz m Vrms

At this point, the function generator outputs the waveform with the displayed offset. Notice that the

Shift Cancel .

Offset annunciator turns on, indicating

that the waveform is being output with an offset. The annunciator will turn on when the offset is any value other than 0 volts. To turn off the

flashing digit, move the cursor to the left of the display using the arrow keys.

-01.50 mVDC



You can also use the knob and arrow keys to enter a number.

Chapter 2 Quick Start

To set the duty cycle

Applies only to square waves. At power-on, the duty cycle for square waves is 50%. You can adjust the duty cycle for a square waveform from 20% to 80%, in increments of 1% (for frequencies above 5 MHz, the range is 40% to 60%). The following steps show you how to change the duty cycle to 45%.

1 Select the square wave function.

Notice that the annunciator turns on, indicating that the square wave function is enabled.

Shift % Duty 2 Enable the duty cycle modify mode.

The displayed duty cycle is either the power-on value or the previous value selected.

50 % DUTY

This message appears on the display for approximately 10 seconds. Repeat this step as needed.

Enter Number

4 5 Notice that the Num annunciator turns on and “ENTER NUM” flashes on

3 Enter the desired duty cycle.

the display, indicating that the number mode is enabled.

To cancel the number mode, press

Enter 4 Output the waveform with the displayed duty cycle.

Shift Cancel .

45 % DUTY

You can also use the knob and arrow keys to enter a number.

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