Omega HOS-MS420 User guide

User’s Guide

1

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MADE IN CHINA

HOS-MS420

20mhz Oscilloscope

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Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047 USA

Toll Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec), H7L 5A1 Canada
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

For immediate technical or application assistance:

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Customer Service: 1-800-622-2378/1-800-622-BEST
Engineering Service: 1-800-872-9436/1-800-USA-WHEN

Mexico/ En Español: 001 [phone] FAX: [phone]
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Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [email protected]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
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Germany/ Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany
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United Kingdom: OMEGA Engineering Ltd.

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Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [email protected]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

INTRODUCTION

Congratulations on your purchase of the Extech Digital Oscilloscope. This

manual is divided into two sections: Section One for the Oscilloscope

functions and Section Two for the MultiMeter functions. This meter is shipped

fully tested and calibrated and, with proper use, will provide years of reliable

service.

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TABLE OF CONTENTS

GENERAL INFORMATION

WARRANTY 5

RODUCT CONTENTS 6

P

AFETY INFORMATION 7

S

NPUT CONNECTIONS 10

I

RONT PANEL AND CONTROL KEYS OVERVIEW 11

F

ECALL FACTORY DEFAULT SETTINGS 19

R

DATA TRANSMISSION 63

PC

FAQ. 76

PPENDIX A: SPECIFICATIONS 77

A

PPENDIX B: MAINTENANCE AND CLEANING 82

A

PPENDIX C: BATTERY CHARGING AND REPLACEMENT 83

A

PPENDIX D: SETTING THE REAL TIME CLOCK 84

A

SECTION ONE - OSCILLOSCOPE

BASIC INSTRUCTIONS ON USING THE OSCILLOSCOPE 13

OWERING THE OSCILLOSCOPE. 13

P

AIN OSCILLOSCOPE DISPLAY SCREEN 13

M

ENU DESCRIPTION 15

M

ETTING THE TRIGGER POSITION AND TIME BASE 15

S

SCILLOSCOPE INPUT CONNECTIONS 19

O

EASURE UNKNOWN SIGNALS / AUTO SET FEATURE 20

M

UTO ZERO THE HORIZONTAL TRIGGER. 20

A

UTOMATIC RANGING MEASUREMENTS 20

A

ATA HOLD 21

D

VERAGE MODE TO SMOOTH WAVEFORMS 22

A

ERSISTENCE MODE (SUPERIMPOSE WAVEFORMS) 22

P

EAK DETECT (GLITCH CAPTURE) 23

P

COUPLING MODE 24

AC

EVERSE WAVEFORM POLARITY 25

R

ATHEMATICAL FUNCTIONS 26

M

MASS STORAGE . 27

USB

DVANCED OSCILLOSCOPE FUNCTIONS 28

A

ERTICAL SETTINGS FOR CH1 AND CH2 28

V

HANNEL COUPLING 29

C

PEN AND CLOSE MEASUREMENT CHANNELS 30

O

ETTING THE PROBE ATTENUATION 30

S

NVERT A WAVEFORM DISPLAY. 30

I

ATHEMATICAL FUNCTION MENU SETTINGS 31

M

ETTING UP THE TRIGGER SYSTEM 32

S

RIGGER CONTROL 33

T

CQUISITION MODE 40

A

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D

ISPLAY SETTINGS 40
TORING WAVEFORMS IN THE METER 42

S

UNCTION SETTINGS MENU 43

F

UTO CALIBRATION. 44

A

UTO RANGE MEASUREMENTS 44

A

UTOSCALE MODE . 45

A

URSOR MEASUREMENTS 49

C

REQUENCY COUNTER (MS460) 52

F

QUARE WAVE OUTPUT. 53

S

MODE.(MS420) 54

FFT

YSTEM STATUS MENU. 61

S

IME BASE MODE . 62

T

SECTION TWO – MULTIMETER FUNCTIONS 64

CONNECTING THE METER. 65
D

ISPLAY WINDOW. 65
ESISTANCE MEASUREMENTS 67

R

EASURING DIODE VOLTAGE 67

M

ONTINUITY TEST. 68

C

EASURING CAPACITANCE 69

M

EASURING DC VOLTAGE 69

M

EASURING AC VOLTAGE 70

M

EASURING DC CURRENT 71

M

EASURING AC CURRENT 72

M

ATA HOLD (FREEZE READINGS) 73

D

ELATIVE MEASUREMENTS 74

R

UTOMATIC / MANUAL RANGE 75

A

Copyright © 2010 Extech Instruments Corporation (a FLIR company)

All rights reserved including the right of reproduction in whole or in part in any form.

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PRODUCT CONTENTS (REFER TO THE FIG. 1 BELOW)

1. MS420 / MS460 Instrument

2. AC Adaptor

3. Oscilloscope Probes (2); Grey in color

4. Multimeter test leads (2); One black, one red

5. USB mass storage connection cable

6. Extension module for low capacitance measurements

7. Probe adjustment tools

8. USB or Serial PC Communication cable

9. User manual

10. CD-ROM Software Program

11. Carrying Case

Figure 1: Supplied Equipment

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

SAFETY INFORMATION

Please read the user manual before use to ensure safety and precision

SAFETYSYMBOLSANDTERMS

SAFETY SYMBOLS

THESE SYMBOLS MAY APPEAR IN THIS MANUAL OR ON THE INSTRUMENT:

WARNING: “WARNING” IDENTIFIES CONDITIONS & ACTIONS THAT POSE A HAZARD

TO THE USER

Caution: “Caution” identifies conditions and actions that may damage the

DANGER:

High

product or external equipment

Refer to the

Manual

Protective

Conductor

Terminal

Chassis

Ground

(ground)
Terminal

SAFETY TERMS

The following terms may appear on the instrument:

Danger: The term “Danger” is used in this manual to indicate that

immediate personal injury can result

Earth

Warning: The term “Warning” is used in this manual to indicate that,

although immediate personal injury is not likely, caution should be

taken

Notice: The term “Notice” is used in this manual to indicate that damage to

the meter or to other equipment can occur

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

GENERALSAFETYINFORMATION

Carefully read the following safety information in order to avoid personal injury and

damage to this product or to products connected to it. This product must only be

used in the specified manner to prevent danger and hazard to products and persons.

Warning:

To avoid fire or electrical shock please use the proper power adapter. Use only

the power adapter recommended by the manufacturer.

Warning:

To avoid fire or electrical shock do not connect meter to more than 42V peak
(30Vrms) or on circuits of more than 4800VA:

● Use only the insulated voltage probes, test leads and adapter supplied with

the test tool, or as indicated by Extech as suitable for the Oscilloscope &
Multimeter.

● Before use, inspect voltage probes, test leads and accessories for

mechanical damage. Replace the equipment when it appears damaged.

● Remove all probes, test leads and accessories when not in use.

● Always connect the power adapter first to the AC outlet before connecting

it to the Oscilloscope & Multimeter.

● Do not apply voltages that exceed 400 V from earth ground to any input

when measuring in a CAT II environment.

● Do not apply voltages that exceed 400 V to the isolated inputs when

measuring in a CAT II environment.

● Use caution when using 1:1 test leads since the probe tip voltage will be

directly transmitted to the Oscilloscope & Multimeter.

● Do not use exposed metal BNC or banana plug connectors.

● Do not insert metal objects into the connectors.

● Always use the Oscilloscope & Multimeter in the manner specified.

● Voltage ratings, mentioned in the warnings, are provided as “working

voltage” limits. They represent V ac rms (50-60Hz) for AC sine wave

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applications and as V dc for DC applications. Overvoltage Category II refers
to local level applicable for appliances and portable equipment.

Only qualified technical personnel should perform maintenance on these
devices.

Observe the nominal value limits for all terminals: To avoid fire or electric shock,

observe all nominal value limits, markings, and specifications for this product. Before
connecting to this product, carefully read the user’s manual.

Do no operate this instrument without the cover plate secured: If the cover plate
or panel has been removed, do not use this product.

Do not touch bare conductors

Do not use this meter in case of any undetermined failure: When in doubt

consult qualified repair personnel

Do not hinder the meter’s ventilation: Refer to the user manual for detailed
installation instructions and proper setup for adequate ventilation

Do not operate this meter in overly humid environments.

Do not operate this meter in potentially explosive environments.

Keep the meter’s surface clean and dry.

Use of this device in any manner inconsistent with the uses specified in this manual

can possibly compromise the safety protection provided by the meter.

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INPUT CONNECTIONS

INPUTCONNECTIONS

See Figure 2 below

6

Figure 2

Description

1. The power adapter is use to supply AC power and for battery recharging

2. Multimeter test leads

3. Multimeter input jacks (L to R: Current 2A-10A input, mA Current input, COM

ground input, Voltage/Resistance/Capacitance input)

4. Oscilloscope probes

5. Oscilloscope channel inputs

6. Square wave output jack

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FRONTPANELANDKEYPADOVERVIEW

Figure 3

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Description of Meter Front Panel and Keypad (Figure 3)

1. AC adapter Port

2. RS-232C Port

3. USB Port

4. USB Mass Storage Port

5. Power switch

6. F1 – F5 Soft-key options

7. AUTO SET: In the Scope mode, the meter automatically selects the
horizontal/vertical scale and trigger level

8. COPY: Press to store the waveform data into a USB storage device

9. ▲ (Red): Adjust the horizontal scale for Channel 1

10. VOLTS POSITION (Red): Switch between voltage and horizontal scales for

Channel 1

11. ▼ (Red): Adjust the horizontal scale for Channel 1

12. ▲ (Blue): Adjust the horizontal scale for Channel 2

13. VOLTS POSITION (Blue): Switch between the voltage and horizontal scales

for Channel 2

14. ▼ (Blue): Adjust the horizontal scale for Channel 2

15. RUN/STOP: Start/Stop the waveform capture process

16. BACKLIGHT: Turn the display backlight ON and OFF

17. DMM/OSC: Operation mode (switch between oscilloscope and multimeter)

18. MENU ▲: Choose a higher item on a menu list

19. MENU: Show / Hide menu

20. MENU ▼: Choose a lower item on a menu list

21. OPTION: Used in combination with the four (4) yellow arrow keys. This

button is used to set the main time base, trigger horizontal position and
trigger vertical position. Also used to adjust the display multiplier factors and
display vertical position during waveform calculation. Further, it is used to
adjust cursor 1 (V1 or T1) and cursor 2 (V2 or T2) position during cursor
measurements

22. ▲ (yellow): Oscilloscope UP arrow adjustment key

23. ▼ (yellow): Oscilloscope DOWN arrow adjustment key

24. ► (yellow): Oscilloscope FORWARD adjustment key

25. ◄ (yellow): Oscilloscope BACKWARD adjustment key

26. A: Selects DMM Current measurement mode

27. V: Selects DMM Voltage measurement mode

28. R: Selects DMM impedance, diode, continuity, capacitance measurement

mode

29. SET: Toggle AC/DC in the current or voltage multimeter measurement

modes; also switches between resistance, diode and capacitance modes
while in the resistance mode.

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

BASIC OSCILLOSCOPE FUNCTIONS

ABOUTTHISCHAPTER

This chapter provides introductory Oscilloscope instructions. This introduction does

not cover all of the oscilloscope capabilities but provides basic examples of menu

navigation and operations. Detailed instructions are provided in the Advanced

Oscilloscope functions section.

POWERINGTHEOSCILLOSCOPE

Connect the oscilloscope to an AC power source using the supplied AC adaptor.

If the battery is charged, the oscilloscope may be powered by the supplied and

installed Li-ion battery. The meter will run for up to four (4) hours on a full charge.

Turn the oscilloscope on by pressing the power key.

Upon power up, the instrument performs a ‘self check’. The display will show the

“press any key to continue……” screen.

MAINOSCILLOSCOPEDISPLAYSCREEN

Figure 4: Oscilloscope Display Screen

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Description of Oscilloscope Display Screen (Figure 4)

1. Battery power status icon (

, , and )

2. Auto measurement screen No. 1 (“f” for frequency, “T” for cycle, “V” for

average value, “Vp” is the peak-peak value and “Vk” is the root-mean-

square value

3. Auto measurement screen No. 2

4. Horizontal triggering position

5. The difference in time between the horizontal triggering position and the

screen’s centerline (zero when the pointer is in the center of the screen)

6. The trigger modes:

Auto: The oscilloscope is in the automatic mode and displaying the

waveform in the non-trigger mode

Trig’d: The oscilloscope has detected a trigger and is displaying the

information generated after the trigger

Ready: All pre-triggered data has been captured and the oscilloscope is

ready to receive trigger signals

Scan: The oscilloscope records and displays waveform data continuously

Stop: The oscilloscope has stopped collecting waveform data

7. Red and blue trigger pointer shows vertical position of alternate triggers.

The trigger pointer turns green when it reaches an edge trigger or a video

trigger

8. Hide or View the menu using the MENU key;

9. Menu setting options (vary with each function)

10. Trigger Voltage Level

11. Trigger signal source

12. Primary Time Base

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13. The coupling mode for CH2; “~” AC, “-” DC, and ground

14. The vertical Voltage units scale for CH2

15. The coupling mode for CH1; “~” AC, “-” DC, and ground

16. Vertical Unit Scale for CH1

17. The blue pointer shows the ground point of the waveform for CH2 (zero

position). If this pointer is not shown, the channel has not been opened.

18. OPTION (options vary with each function)

19. The red pointer shows the ground point of the waveform for CH1 (zero

position). If this pointer is not shown, the channel has not been opened

20. Waveform display area. Red waveform represents CH1, blue represents

CH2

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MENUDESCRIPTION

The following explains how to navigate the menus to select a function.

1. Press the MENU key to open the Function Menu. The Menu appears on the right

of the screen with the corresponding options available on the bottom of the
screen. Press MENU again to hide the Function Menu.

2. Use the MENU ▲ or MENU ▼ keys to navigate and select menu functions.

3. Use the soft-keys (F1…F5) to select an available option

Figure 5: Menu

MANUALLYSETTINGTHETRIGGERPOSITIONANDTIMEBASE

Use the OPTION key to set the vertical trigger position, the main time base and
the horizontal trigger position during Edge triggering and Video Triggering or vertical
trigger position for Horizontal time base and vertical trigger position and horizontal
level position during an Alternate trigger.

The following example shows how to use the OPTION key to change a setting.
For triggering in edge and video trigger mode:

1. Press the OPTION key once; the following will appear at the screen’s bottom left:

◄/► – Time Base
▲/▼ – Trig

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

Figure 6

2. Press ◄ (yellow) or ► (yellow) to adjust the main time base. Press ▲ (yellow)

or▼ (yellow) to adjust the trigger horizontal position.

3.

Press OPTION again and the following will appear:

◄/► – Time
▲/▼– Trig

See Figure 7:

Figure 7

4. Press ◄ (yellow) or ► (yellow) to adjust time base horizontal position, press▲

(yellow) or ▼ (yellow) to adjust trigger position.

5. Use the OPTION key to toggle between the two modes described above.

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When triggering in the Alternate trigger mode:

7. Press OPTION and the following will appear:

—Time

—Trig 2

See Figure 8:

Figure 8:

7. Press ◄ (yellow) or ► (yellow) to adjust the time base horizontal position and

press ▲ (yellow) or ▼ (yellow) to adjust the trigger horizontal position for Channel 2.

8. Press OPTION again to display the following:

— Time Base

— Trig 1

See Figure 9:

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

Figure 9:

9. Press ◄ (yellow) or ► (yellow) to adjust the main time base and press ▲

(yellow) or▼ (yellow) to adjust the trigger horizontal position for Channel 1.

10. Press OPTION again to return to step 6 above.

Glossary of Terms

z Vertical scale factor: The voltage amplitude represented by a division in the

vertical direction of the display area, through the adjustment of which the user can

amplify or attenuate the signal and thus regulate the signal amplitude so that it is

placed in the expected measurement range.

z Vertical zero position: Ground point, through the adjustment of which the user

can regulate the display position of the waveform on the screen.

z Main time base: The time value represented by a division in the horizontal

direction of the display area.

z Trigger horizontal position: The time difference between the actual trigger point

and the screen central line, which will be displayed as 0 at the center point of the

screen.

z Trigger level position: The voltage difference between the actual trigger level

and the zero position of the triggering signal source channel.

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RECALLTHEFACTORYDEFAULTSETTINGS

To reset the Oscilloscope to the factory default settings, refer to the following:

1. Press the MENU key; the function menu will appear on the right side of the

screen

2. Press the MENU ▲ or MENU ▼ key to select a FUNCTION; three options will be

visible at the bottom of the screen.

3. Press F1 (Recall Factory) to recall the factory settings.

4. Press F2 to select “Auto calibration”.

If the ambient temperature varies from the

specified operating temperature by more than 5 degrees Celsius, an Auto

Calibration should be performed.

Refer to Figure 10:

Figure 10: Resetting the Oscilloscope

OSCILLOSCOPEINPUTCONNECTIONS

The Oscilloscope has two (2) signal inputs (located on the lower right side) for CH1

and CH2 measurements.

Isolated inputs allow for independent floating measurements between Multimeter and

Scope functions.

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

MEASUREUNKNOWNSIGNALSUSINGTHEAUTO‐SETFEATURE

The Auto-Set feature allows the Oscilloscope to measure and display unknown
signals automatically. This function optimizes position, range, time-base, and
triggering. It also assures a stable display of virtually any waveform. Auto Range is
especially useful for quickly checking several signals.
To enable the Auto-Set feature, perform the following steps:

1. Connect the test probe to the circuit or device under test.

2. Press the AUTO SET key; the test signals will appear on the screen.

AUTOZEROTHEHORIZONTALTRIGGERANDTRIGGERLEVELPOSITION

To configure the instrument so that the horizontal trigger and the trigger level position
automatically return to zero.

1. Press the V key; the horizontal trigger position will automatically return to zero

2. Press the R key; the trigger level position will automatically return to zero

AUTOMATICMEASUREMENTRANGING

The Oscilloscope offers five (5) ranges that adjust automatically as measurements
are taken. Two numeric readings can be displayed: MEAS SET1 and MEAS SET2
(selectable independently); the measurements can be performed on the CH1 or CH2
waveform inputs.
To choose a frequency for CH1, perform the following procedure:

1. Press the MENU key; the function menu will appear on the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select MEAS SET 1. Five selectable options

will then be visible at the bottom of the screen.

3. Press the F1 key and select Freq CH1 from the root mean square (RMS)

option. The MEAS SET 1 window color will change to red and display CH1
frequency.

To choose Peak-Peak measurements for the CH2 input, refer to the following:

1. Press the MENU key; the function menu will appear at the right side of the

screen.

2. Press MENU ▲ or MENU ▼ key to select MEAS SET 2. Five (5) selectable

options will appear at the bottom of the screen.

3. Press the F4 key to select PK-PK CH2 from the Peak-Peak option. The MEAS

SET2 window color turns to blue and displays the peak-peak value for the CH2
input.

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Refer to Figure 11:

Figure 11: Automatic Scope Measurements

DATAHOLD(FREEZINGTHEDISPLAYEDREADING)

To freeze any displayed reading or waveform, follow these steps:

1. Press the RUN/STOP key to freeze the screen: STOP appears at the top (right)

of the screen.

2. Press the RUN/STOP key again to resume normal mode. Refer to Fig. 12:

Figure 12: Freezing the Screen

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

USINGTHEAVERAGEMODETOSMOOTHWAVEFORMS

Use the Average mode to smooth the displayed waveform; multiple data samples will
be averaged. The number of samples to average is selectable from 4, 16, 64, up to

128.

Note: For best results, the waveform must be repetitive. As the number of average

samples increases the waveform updating time increases. Refer to the following:

1. Press the MENU key; the function menu will appear on the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select the ACQU (acquisition) mode; Four (4)

selectable options will display at the bottom of the screen.

3. Press the F3 key to select Average Factors and then press the F4 key to jump

to Averages 16. The meter then averages 16 samples (or acquisitions) and
displays the final result. Refer to Figure 13:

Figure 13: Average Factor Sampling Mode

PERSISTENCEMODE(SUPERIMPOSINGWAVEFORMS)

Persistence Mode allows the user to hold a displayed waveform on the display while,

at the same time, superimposing the current waveform. The user can select the

amount of time (number of seconds or infinite) to retain the displayed waveform

or set the feature OFF. Refer to the following:

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1. Press the MENU key; the function menu will appear on the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select DISP SET. Four (4) selectable options

will appear at the bottom of the screen.

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3. Press the F2 key to select 1 sec, 2 sec, 5 sec, infinite or OFF. Select a 1, 2,

or 5 second waveform display duration as desired. When Infinite is selected
the waveform will remain on the screen indefinitely. When OFF is selected, the
Persistence function has no effect on displayed waveforms.

Refer to Figure 14.

Figure 14: Persistence Mode to Observe Dynamic Signals

USINGPEAKDETECTIONTOCAPTUREGLITCHES

Use Peak Detect to display events (glitches or other asynchronous waveforms) down
to 50 ns (nanoseconds).

1. Press the MENU key; the function menu will appear at the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select the ACQU MODE. Four (4) selectable

options will appear at the bottom of the screen.

3. Press the F2 key to select Glitch Detect.

Refer to Figure 15.

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Glossary of Terms

Figure 15: Peak Detection

• Collecting mode: The oscilloscope converts the collected analog data into

digital data for each of the following three modes: Sampling, Peak Detect, and

Averaging.

• Sampling: The waveform sampling resolution in seconds. Waveforms that change

faster than the sample duration will not be accurately captured.

• Peak value detection: In peak detect mode the meter can capture very narrow

pulses down to 50ns

• Averaging values: The oscilloscope averages a selectable number of

measurements. Random noise can be minimized in this mode.

• Duration time: A waveform can be held as a new waveform is displayed. The

amount of time the previous waveform is displayed is the ‘duration time’.

• Roll scan: The oscilloscope updates the waveform sampling points by scrolling

the screen from left to right (applicable only to primary time base settings above

50ms).

SELECTINGAC‐COUPLING

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After a reset, the Oscilloscope is dc-coupled so that ac and dc voltages appear on the

screen. Use ac-coupling to observe a small ac signal that rides on a dc signal. To select

ac-coupling, perform the following steps:

1. Press the MENU key; the function menu will appear at the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select the CH1 Setting. Four (4) selectable

options appear at the bottom of the screen.

3. Press the F1 key and select AC. The AC coupling icon will appear on the

screen.

Refer to Figure 16.

Figure 16: AC-Coupling

REVERSINGTHEPOLARITYOFTHEDISPLAYEDWAVEFORM

To invert the input CH1 waveform, perform the following steps:

1. Press the MENU key; the function menu will appear at the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select CH1 setting. Four (4) selectable options

will appear at the bottom of the screen.

3. Press the F4 key to select Inverted. The CH1 inverted waveform will then be

displayed on the screen.

Refer to Figure 17.

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Figure 17: Inverted Waveform

USINGMATHEMATICALFUNCTIONSONWAVEFORMS

When adding (CH1 + CH2), subtracting (CH1 – CH2, CH2 – CH1), multiplying (CH1 *

CH2) or dividing (CH1/CH2) the input waveforms of CH1 and CH2, the oscilloscope

will display the mathematical result waveform M and the input waveforms of CH1 and

CH2 on the screen. The Mathematical functions perform a point-to-point calculation

on the waveforms (CH1 and CH2).

To use a Math function, perform the following steps:

1. Press the MENU key; the function menu will appear at the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select WAVE MATH. Five (5) selectable

options will appear at the bottom of the screen.

3. Press the F3 key to select CH1+CH2; the calculation resulting waveform M

(green) will then appear on the screen. Press the F3 key again to exit the
Waveform Calculation mode.

4. Press OPTION and the screen will show the following on the bottom left:

—CH Math Volts/Div

—CH M Zero

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5. Press▲(yellow) or ▼(yellow) to adjust the vertical display position of waveform M.

Press ◄

Refer to Figure 18.

(yellow) or ►(yellow) to adjust the display time factor for waveform M.

Figure 18: Waveform Mathematical Calculations

USBMASSSTORAGEDEVICE/SAVEWAVEFORMDATA

Connect a USB mass storage device to the USB port on the meter using the supplied

cable. Press the COPY key. The current waveform data will then be saved (the file

names are automatically sequenced (WAVE1.bin, WAVE2.bin, etc.). Now connect

the USB Mass Storage device to a Personal Computer and use the supplied software

to transfer and manipulate the stored data.

Note: Refer to the HELP utility in the supplied software for further instructions.

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ADVANCED OSCILLOSCOPE FUNCTIONS

ABOUTTHISCHAPTER

Advanced Oscilloscope functions are covered in this chapter.

VERTICALSETTINGSFORCH1ANDCH2

Each channel has its own independent vertical menu and each item can be set

respectively based on the specific channel.

To make vertical CH1 and CH2 settings, perform the following steps:

1. Press the MENU key; the function menu will appear at the right of the screen.

2. Press MENU ▲ or MENU ▼ to select CH1 SETUP. Four (4) selectable options will

appear at the bottom of the screen.

3. Use the soft function keys (F1 through F4) to adjust settings as desired.

Refer to Figure 19.

Figure 19: Vertical Settings

29

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

The following Table describes the Vertical Channel menu:

Function

menu

Setting

Description

AC

The dc component in the input signal is blocked

Coupling

DC

OFF

The ac and dc components of the input signal are available

Close the channel

Channel

ON

1X

10X

Open the channel

Select the desired probe attenuation

Probe

100X

1000X

OFF

Waveform is displayed normally

Inverted

ON

Open the Invert function for the waveform setting

SETTING THE CHANNEL COUPLING

CH1 will be used in this example.
Press F1 Coupling and then AC to set AC coupling. The DC component contained
in the tested signal is blocked.
Press F1 Coupling and then DC to set DC coupling. Both DC and AC components
contained in the tested signal are permitted.
Refer to Figures 20 and 21.

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Figure 20: AC Coupling

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Figure 21: DC Coupling

OPEN AND CLOSE MEASUREMENT CHANNELS

CH1 will be used in this example.

Press the F2 Channel key and then OFF to Close CH1.

Press the F2 Channel key and then ON to Open CH1.

SETTING THE PROBE ATTENUATION

To prevent excessive input voltage, set the probe attenuation level to the 10X

position.

Next, magnify the display by 10X to match the displayed amplitude to the actual

amplitude.

Press F3 Probe to adjust the probe attenuation level.

Table: Probe attenuation level and the corresponding menu setting

Probe attenuation

level

1:1 1X

10:1 10X

Corresponding Menu Setting

100:1 100X

1000:1 1000X

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INVERT A WAVEFORM

Inverted waveform: The displayed signal reverses 180 degrees relative to ground.

Press F4 Invert to invert the waveform; press F4 Invert again to exit the inversion

mode.

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WAVEMATHFUNCTIONMENUSETTINGS

The WAVE MATH functions show the calculation results (adding, subtracting,

multiplying or dividing CH1 and CH2 channel waveforms). Arithmetic operation

results can be displayed using a grid or a cursor. The amplitude of the calculated

waveform can be adjusted with CHM VOL, which is displayed in the scale factor

form. The amplitude ranges from 0.001 through 10 (in 1, 2, and 5 step increments)

that is, it can be expressed as 0.001X, 0.002X, 0.005X…10X. The position of the

calculated waveform can be adjusted up and down using the CHM ZERO key.

The corresponding operation function table

Setting Description

CH1-CH2 CH1 waveform minus CH2 waveform

CH2-CH1 CH2 waveform minus CH1 waveform

CH1+CH2 Add CH1 waveform to CH2 waveform

CH1*CH2 Multiply CH1 and CH2 waveforms

CH1/CH2 Divide CH1 by CH2

To perform a CH1+CH2 waveform calculation, perform the following:

1. Press the MENU key; the function menu will appear at the right of the screen.

2. Press MENU ▲ or MENU ▼ to select WAVE MATH. Five (5) selectable options will

then be displayed at the bottom of the screen.

3. Press the F3 CH1+CH2 key and waveform M appears on the screen. Press the F3

key again to close waveform M.

4. Press OPTION and the display will show the following:

— CH Math Volts/Div

— CH M Zero

Press ◄

Press ▲

Refer to Figure 22.

(yellow) or ► (yellow) to adjust the range of the M waveform
(yellow) or ▼ (yellow) to adjust the position of the M waveform

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Figure 22: Waveform Mathematics

SETTINGTHETRIGGERSYSTEM

The trigger determines when the acquisition and display of waveform data occurs. When

starting to acquire data, the oscilloscope collects sufficient information to draw the

waveform at the left side of the triggering point. While waiting for a triggering condition,

the oscilloscope gathers data continuously. After a trigger is detected, the oscilloscope

gathers data continuously to draw the waveform at the right side of the triggering point.

To set a trigger mode, perform the following steps:

1. Press the MENU key; the function menu will appear at the right of the screen.

2. Press MENU ▲ or MENU ▼ to select TRIG MODE. Five (5) selectable options will

then be available at the bottom of the screen.

3. Use the soft-keys (F1 to F5) to select and configure the desired options.

4. Press OPTION; the following will appear on the display during edge triggering and

video triggering modes:

— Time — Time Base

— Trig — Trig

During alternate triggering the following will be displayed:

—Time Base — Time

—Trig1 — Trig2

5. Press ▲

(yellow) or ► (yellow) to adjust the time base horizontal position or adjust the

horizontal position.

(yellow) or ▼ (yellow) to adjust the vertical trigger position, Press ◄

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TRIGGERINGCONTROL

There are three triggering modes: Edge triggering, Video triggering, and Alternating

triggering. Each trigger mode has its own function menu.

Edge triggering: The edge trigger triggers on the incoming signal edge. Use the

edge trigger for all signals except for video.

Video triggering: Perform video field trigger or line trigger on standard video signals.

Alternate trigger: Use this mode when the CH1 and CH2 signal frequency differs.

The following describes the Edge triggering, Video triggering and Alternating

triggering menus respectively.

EDGE TRIGGERING

Edge triggering is a mode by which triggering occurs at the threshold of the input signal’s

edge. With Edge triggering selected, the trigger occurs on the rising or falling edge of

the input signal (Figure 23).

Figure 23: Edge Trigger

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The Edge triggering menu is described in the following table

Function

Settings

Description

menu

Slope Rising

Falling

Source CH1

CH2

Trig mode Auto

Triggering on the rising edge of the signal

Triggering on the falling edge of the signal.

CH1 is used as the trigger source

CH2 is used as the trigger source

Acquisition of waveforms is possible even if
there is no triggering condition detected

Acquisition of waveforms can only be performed

Normal

Single

when the triggering condition is satisfied

Sampling is performed on a waveform when one
trigger is detected (sampling then stops).

Move to the next menu

Coupling AC

DC

The DC component is blocked

All components are allowed

HF Rjc

HF part of the signal is blocked; only the LF
component is allowed

The LF part of the signal is blocked; only the HF

LF Rjc

component is allowed

SENS Trigger sensitivity*

Hold-off Move to the Hold-off menu

Return to previous menu

*Sensitivity: Sensitivity is an adjustment that allows the meter to obtain a stable
trigger by excluding the influences of signal noise. The sensitivity is adjustable from

0.2div~1.0div.

VIDEO TRIGGERING

The video trigger is designed to capture a video signal format, NTSC, PAL or SECAM.

For any other signal type, use the Edge trigger mode. Refer to Figure 24a & b, Figure 25

and Figure 26.

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Figure 24a (screen 1) and 24b (screen 2): Odd Field Video Trigger

Fig. 25: Video Line trigger (screen 1) Fig. 26: Video Line Trigger (screen 2)

The Video triggering menu is described in the following table.

Function
menu

First screen

Polarity

Source

Sync

(Synchronization)

Settings Description

Normal

For video signals with low black levels

For video signals with high black levels

Inverted

CH1

CH2

Line

Field

Select CH1 as the trigger source

Select CH2 as the trigger source

Set synchronous trigger in video line

Set synchronous trigger in video field

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Odd field

Even field

Line NUM

Set synchronous trigger in video odd line

Set synchronous trigger in video even line

Set synchronous trigger in video Line NUM

Move to next menu

When the sync is Line, Field, Odd Field, Even Field, the second page is as
follows:

NTSC

MODU

(Modulation)

PAL/SECAM

National Television System Committee standard
(most common)

Less common video standard (used in Europe)

Hold-off Move to the Hold-off menu

Return to previous menu

When the sync is Designed Line, the second page is as follows:

MODU

(Modulation)

Line

NTSC

PAL/SECAM

Increase

Decrease

National Television System Committee standard
(most common)

Less common video standard (used in Europe)

The Line value will increase

The Line value will decrease

Line No. Set and show the Line value

Hold-off Move to the Hold-off menu

Return to previous menu

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ALTERNATE TRIGGER

In Alternate trigger mode, the trigger signal is taken from two vertical channels. Alternate

trigger mode can be used to observe two signals of differing frequencies. From this menu

the user can set a different trigger type for two separate vertical channels.

Refer to Figure 27a.

Figure 27a: Alternate Trigger

The Alternate triggering menu is described in the following tables.

Function

Settings Description

menu

When EDGE TRIGGERING is selected:

CH SEL CH1

CH2

Type Edge

Video

Edge type Rising

Falling

Set trigger type and other parameters for Channel 1

Set trigger type and other parameters for Channel 2

Set vertical channel trigger as edge trigger

Set vertical channel trigger as video trigger

Triggering on the rising (leading) edge of the signal

Triggering on the falling (trailing) edge of the signal

Move to the next menu

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Coupling

AC

DC

HF Rjc

The DC component is blocked

All components are allowed to pass

The HF part of the signal is blocked and only the
LF component is allowed

The LF part of the signal is blocked and only the

LF Rjc

SENS

Hold-off Move to the Hold-off menu

Set trigger sensitivity

Return to previous menu

HF component is allowed

Function menu Settings Description

When VIDEO TRIGGERING is selected:

CH SEL CH1

Set trigger type and other parameters for
CH1

CH2

Set trigger type and other parameters for
CH2

Type Edge

Video

Video type

Polarity

Sync

(Synchronization

Normal

Inverted

Line

Field

Set vertical channel trigger as edge trigger

Set vertical channel trigger as video trigger

For video signals with low black level

For video signals with high black level

Set synchronous trigger in video line

Set synchronous trigger in video field

)

Odd field

Set synchronous trigger in video odd line

Even field

Set synchronous trigger in video even line

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

Line NUM

Set synchronous trigger in video Line NUM

When the sync is Line, Field, Odd Field, Even Field, the menu is as follows:

MODU

(Modulation)

NTSC

PAL/SECAM

Common video standard (used in the U.S.)

Least common standard (common in
Europe)

Hold-off Move to the Hold-off menu

When the sync is Designed Line, the menu is as follows:

MODU

(Modulation)

NTSC

PAL/SECAM

Common video standard (used in the U.S.)

Least common standard (common in
Europe)

Line

Line No. Set and show the Line value

Hold-off Move to the Hold-off menu

Increase

Decrease

The Line value will increase

The Line value will decrease

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When the ‘Hold-off’ menu is accessed the screen will appear as below:



Figure 27b: ‘Hold-off’ menu screen (MS420)

Refer to the Table below for details on the ‘Hold-off’ mode: (MS420 only)

Function menu Settings

Description

OFF Time Select a time duration (hold-off time) that

will act as a delay before each trigger
event

Time Increase

Decrease

Increase the time

Decrease the time

Reset the Time Reset the hold-off time to 100ns

Back Return to the previous menu

Note:

Trigger Hold-off can stabilize complex waveforms. Hold-off time is the

oscilloscope’s waiting period before starting a new trigger. During Hold-off,

oscilloscope will not trigger.

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Glossary of Terms

• Hold-off time: Programmable time period between trigger events (100ns default).

• Trigger modes: There are three trigger modes: Auto (acquires signal continuously),

Normal (acquires signal when trigger conditions are met) and Single (manually

triggers the signal).

• Automatic trigger mode: In this mode, the oscilloscope can acquire a waveform

without a triggering condition

• Normal trigger mode: In this mode, the oscilloscope cannot acquire the waveform

until it is triggered. When no trigger is present, the oscilloscope will display only the

original waveform; no new waveforms can be captured until a trigger is detected.

• Single mode: In this mode, the oscilloscope will detect a trigger and capture a

waveform each time the user presses the RUN/STOP key.

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ACQUISITIONMODE

The Acquiring Mode menu is described in the Table shown below.

Function menu Settings

Description

Sample The waveform data sampling time interval. The

sample mode accurately reconstructs the waveform,
but cannot respond to rapid changes and sudden
peaks.

Peak Detect 50ns

max.

The peak detect mode captures rapid changes and
sudden peaks.

Average Multiple samples are averaged. The average mode

reduces the noise level (for best results, the waveform
must be repetitive)

Averages 4, 16, 64

Select the number of samples to average

or 128

DISPLAYSETTING

The Display Setting menu is described in the following table.

Function menu

Settings

Type Vectors

Description

Shows the waveform as a smooth line, connecting each
data point

Shows the waveform as a collection of independent

Dots

Persist OFF

1s

data points

Sets the duration of time that previous waveforms
remain on the display (useful for observing waveform

2s

variations)

5s

Infinite

Format YT Displays the relative relationship between vertical

voltage and horizontal time.

Displays CH1 on the horizontal axis and CH2 on the

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XY vertical axis

Carry Bitmap

Vectors

Data transmitted in bitmap format (dots)

Data transmitted in vector format (line)

DISPLAY STYLE

The display style includes Vector and Dot display types, as shown in Figure 28 and 29.

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Figure 28: Dot Style

Figure 29: Vector Style

PERSISTENCE

The user can select the duration of time that past traces remain on the display. The

selections are 1, 2, 5 seconds, Infinite, and OFF.

XY MODE

This mode is only applicable to simultaneous CH1 and CH2 measurements. The X-Y

format plots the CH1 input as X-axis and CH2 input as Y-axis. This display mode is

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convenient for viewing the phase relationship between CH1 and CH2; if the

oscilloscope does not detect triggering the data appear in light spots.

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Description of Control Keys:

■ The CH1 VOL and CH1 ZERO keys for CH1 are used to set the horizontal

scale and position.

■ The CH2 VOL and CH2 ZERO keys for CH2 are used to set the vertical scale

and position continuously.

The following functions are not available in the XY display mode:

■ Reference or digital value waveform

■ Cursor

■ Time base control

■ Trigger control

STORINGWAVEFORMS

The oscilloscope can save four (4) waveforms that can be displayed on the screen along

with the present waveform. The recalled waveforms cannot be adjusted.

The waveform Store / Recall menu is described in the following Table.

Function

Setups Description

menu

Source CH1

Select the signal source of the waveform to save
(the waveform to save must be on the display)

CH2

MATH

WAVE A, B, C and D Select the memory address for saving or recalling

data

Save Store the waveform of the selected signal source

into the selected address

Show ON

Set ON to display the waveforms stored in address
A, B, C or D. Choose OFF to exit this feature.

OFF

To save a CH 1 waveform in address A, perform the following steps:

1. Press the MENU key; the function menu will appear at the right of the screen.

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2. Use the MENU ▲ or MENU ▼ key to select Wave Save. Four (4) selectable

options will then appear at the bottom of the screen.

3. Press the F1 key to select CH1 as the signal source.

4. Press the F2 key to select Address A.

5. Press the F3 key to save the waveform on CH1 in address A.

To display the saved waveform on the screen, perform the following steps:

6. Press F4 to select Start for Address A. The waveform saved in Address A will be

displayed in green. The zero point, voltage the time will display in purple

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Refer to Figure 30:

Figure 30: Save and Recall Waveforms

FUNCTIONSETTINGMENU(REFERTOTABLEBELOW)

Press the MENU button and use the up/down arrow keys to scroll to FUNCTION

Function menu

Description

Recall Factory Set the meter’s settings to their factory default

conditions

Auto Calibration Perform an Auto-calibration procedure

Language Select the desired display language (English, Chinese,

Deutsch, or Greek)

Auto-calibration

The Auto-calibration function automatically configures internal parameters to maintain the

sensitivity and accuracy of the meter. Use the Auto-calibration in the following cases:

• When the temperature changes by more than 5 degrees Celsius during operation

• When operating the oscilloscope in a new bench top or field environment

1. Press MENU and select the FUNCTION menu using the MENU ▲ or MENU ▼ key

2. Press F2 (Auto calibration). A message appears asking the user to remove all cables

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and probes from the oscilloscope

3. After removing all cables, press F2 (Auto calibration) again. The Auto-calibration

automatically starts and a status message appears.

To interrupt calibration, press any key during the calibration.

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AUTOMATICRANGINGMEASUREMENTS

The oscilloscope can perform twenty (20) automatic measurements: Frequency,

cycle, average, peak-to-peak, root mean square, Vmax, Vmin, Vtop, Vbase, Vamp,

overshoot, pre-shoot, rise time, fall time, +width, -width, +duty, -duty, delayA

and delayA

B . Two measurement results can be displayed simultaneously on the

B

screen. The function menu for automatic measurements is described in the following

Table.

Function menu Settings

CH1

Freq

CH2

CH1

Period

CH2

CH1

Mean

CH2

CH1

Peak-Peak

CH2

CH1

Cyc RMS

CH2

Description

Measure the frequency of CH1

Measure the frequency of CH2

Measure the period of CH1

Measure the period of CH2

Measure the average value of CH1

Measure the average value of CH2

Measure the peak-to-peak value of CH1

Measure the peak-to-peak value of CH2

Measure Root Mean Square (RMS) value of CH1

Measure Root Mean Square (RMS) value of CH2

CH1

Vmax

CH2

CH1

Vmin

CH2

CH1

Vtop

CH2

CH1

Vbase

CH2

CH1

Vamp

CH2

Measure the Vmax of CH1

Measure the Vmax of CH2

Measure the Vmin of CH1

Measure the Vmin of CH2

Measure the Vtop of CH1

Measure the Vtop of CH2

Measure the Vbase of CH1

Measure the Vbase of CH2

Measure the Vamp of CH1

Measure the Vamp of CH2

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Overshoot

Preshoot

RiseTime

Fall Time

+Width

-Width

+Duty

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

Measure the Overshoot of CH1

Measure the Overshoot of CH2

Measure the Preshoot of CH1

Measure the Preshoot of CH2

Measure the RiseTime of CH1

Measure the RiseTime of CH2

Measure the Fall Time of CH1

Measure the Fall Time of CH2

Measure the +Width of CH1

Measure the +Width of CH2

Measure the -Width of CH1

Measure the -Width of CH2

Measure the +Duty of CH1

Measure the +Duty of CH2

CH1

-Duty
CH2

CH1

DelayA B

CH2

CH1

DelayA B

CH2

Measure the -Duty of CH1

Measure the -Duty of CH2

Measure the DelayA

Measure the DelayA

Measure the DelayA

Measure the DelayA

B of CH1

B of CH2

B of CH1

B of CH2

To measure the frequency of CH1 with MEAS SET 1 and the frequency of CH2 with

MEAS SET 2, perform the following steps:

1. Press the MENU key; the function menu will appear on the right side of the screen

2. Press the MENU ▲ or MENU ▼ key to select MEAS SET 1. Five (5) selectable

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

options will then appear at the bottom of the screen

3. Press the F1 key to select the frequency measurement of CH1. The measurement

window will appear red in color and show the frequency of CH1

4. Press the MENU ▲ or MENU ▼ key to select MEAS SET 2. Five (5) selectable

options will then appear at the bottom of the screen

5. Press the F4 key to select the peak-to-peak value of CH2. The measurement

window will appear blue in color and show the peak-to-peak value of CH2

Figure 31: Automatic Measurements

Autoscale

Autoscale enables the instrument to automatically configure the trigger

mode, voltage division and time scale according to the type, amplitude and

frequency of a signal.



The menu is as follows:

Function Menu Setting Instruction

Autoscale

OFF

Turn OFF Autoscale

ON

Turn ON Autoscale

Mode Vertical Adjust vertical scale without

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To measure CH1 voltage:

Horizontal

HORI—VERT

changing horizontal setting

Adjust horizontal scale

without changing vertical

setting

Adjust the vertical and

horizontal settings

Display one or two periods

Display multi-period

waveforms

1. Press MENU, the function menu will appear on the right side of the

screen.

2. Press MENU ▲ or MENU ▼ and choose AUTOSCALE; three (3) options

will appear at the bottom of the screen

3. Press F1 to select ON

4. Press AUTOSET to enter the Autoscale mode; the symbol

flickers

every half second at the top left of the display

5. Press F2 to select the Horizontal/Vertical mode

6. Press F3 and refer to the display examples below:

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Fig 32: Autoscale Horizontal - Vertical multi-period waveforms

Fig 33: Autoscale Horizontal - Vertical mono-period waveform

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Fig 34: Vertical mode multi-period waveform

Fig 35: Horizontal mode multi-period waveform

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Notes:

1. In Autoscale mode the meter can automatically set the Trigger mode

(Edge, Video, and Alternate) and Type (Edge, Video)

2. In Autoscale mode the meter switches to YT Mode (Auto) from XY mode

(STOP)

3. In Autoscale, the meter defaults to DC coupling and AUTO triggering

mode

4. If the user attempts to manually adjust the vertical position, voltage

division, trigger level or time scale while in the Autoscale mode the meter

will automatically exit the Autoscale mode

5. When video triggering, the horizontal time scale is 50us

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

CURSORMEASUREMENTS

Two cursors can be used to make instantaneous Time and Voltage measurements
for CH1 and CH2 signals. Refer to the following table for more information.

Function menu Settings Description

Type OFF

Voltage

Time

Source CH1,

CH2

Exit the cursor measurement mode

Display voltage measurement cursor and menu

Display time measurement cursor and menu

Select the waveform channel on which the cursor
measurement will be performed

Delta (MS460) Display the difference between CH1 and CH2 values

Cursor 1

Data for cursor 1

(MS460)

Cursor 2

Data for cursor 2

(MS460)

To use the cursor for a Voltage measurement on CH1, perform the following steps:

1. Press the MENU key; the function menu will then display at the right of the

screen.

2. Press the MENU ▲ or MENU ▼ key to select Curs Meas. Five (5) selectable

options (MS46) or two (2) selectable options (MS420) appear at the bottom of
the screen.

3. Press the F1 key to select the measurement type Voltage. Two dashed lines
V1 and V2 will appear on the screen.

4. Press the F2 key to select CH 1.

5. Press OPTION and the display will show the following:

Cursor 2

Cursor 1

Use ▲ (yellow) and ▼ (yellow) to move V1 up and down; the voltage value

(relative to the zero position) will display at the bottom of the screen. Use ◄
(yellow) and ► (yellow) to move V2 up and down; the voltage value (relative
to the zero position) will display at the bottom of the screen. The display will
also show the result of V1 - V2. Refer to Figure 36-a.

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

Figure 36-a: Use the Cursor for a Voltage Measurement

When the MENU button is pressed, the data table appears as shown in Figure 36-b:

Figure 36-b: Data Table

To use the cursor for a Time measurement on CH1, perform the following steps:

1. Press the MENU key; the function menus will appear at the right of the
screen.

2. Press the MENU ▲ or MENU ▼ key to select Cursor measurement. Two (2)
selectable options will then appear at the bottom of the screen.

3. Press the F1 key to select the measurement type Time. Two vertical dashed
lines T1 and T2 will appear on the screen.

4. Press the F2 key and select the channel CH1.

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5. Press OPTION and the display will show:

—Cursor 2

—Cursor 1

Press ▲ (yellow) or ▼ (yellow) to move T1 left and right; the value of T1 (relative to
the middle of the screen) will display. Press ◄(yellow) or ►(yellow) to move T2
left and right; the value of T2(relative to the middle of the screen) will display as
shown in Figure 37-a:

Figure 37-a: Time Measurement using cursor

When the MENU button is pressed, the data table appears as shown in Fig. 37-b.





Figure 37-b: Data Table

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

SIX(6)DIGITFREQUENCYCOUNTER(CYMOMETER)MS460ONLY

The frequency counter measurement range is 2Hz~60MHz.

When the meter is configured for edge triggering, it can only measure one channel

(the channel that is triggering). When the triggering mode is set to Alternating trigger

the instrument can measure both channels (CH1 and CH2).

To configure the Frequency Counter for two channel operation:

1. Press MENU and the function menu will appear on the right side of the

screen.

2. Use the MENU ▲ or MENU ▼ key to select DISP SET (Display Setting),

five (5) options will appear at the bottom of the screen.

3. Use the F5 key to select ON; refer to figure 38:

Fig 38: Frequency Counter Display

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

SQUAREWAVEOUTPUTTESTSIGNAL(5V,1KHZ)

The 5V Square Output is available on the jack at the left side of the meter.

The 5V digital output has a frequency of 1 KHz and can be used to adjust

the probe, as shown as Fig.39

Fig 39: Square-wave test signal

Fig 40: 5V square wave output adaptor

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

USINGFFT(FASTFOURIERTRANSFORM)(MS420ONLY)

FFT breaks down signals into component frequencies, which the oscilloscope uses

to display a graph of the frequency domain of a signal (as opposed to the

oscilloscope’s standard time domain graph). These frequencies can then be

matched with known system frequencies, such as system clocks, oscillators, or

power supplies.

The FFT in this oscilloscope can transform 2048 points of a time-domain signal into

its frequency components with the final frequency containing 1024 points ranging

from 0Hz to the Nyquist frequency.

The following table describes the FFT menu:

Function Menu Setting Instruction

ON

Turn on FFT function

FFT

OFF

CH1

Turn off FFT function

Select CH1 as FFT source

Source

CH2

Select CH2 as FFT source

Rectangle

Blackman

Select window for FFT (details below)

Window

Hanning

Hamming

dB

Set Vrms as the vertical scale unit of measure

Format

Vrms

Set dBVrms as the vertical scale unit of measure

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*1

*2

Set multiple *1

Set multiple *2

Zoom

*5

*10

Set multiple *5

Set multiple *10

The steps below instruct on the operation of the FFT feature:

1. Press the MENU key; the function menu will appear on the right side of the

screen.

2. Press MENU ▲ or MENU ▼ to select FFT MODE. Five options will then be

available at the bottom of the screen.

3. Press F1 to turn FFT ON/OFF (the green waveform F will be shown

on the screen after the FFT calculation is completed).

4. Press F2 to switch between channel CH1 and CH2; the currently selected

channel is indicated at the top left of the screen.

5. Press F3 to switch to WINDOW with the following available options:

HAMMING、RECTANGLE、BLACKMAN, and HANNING.

6. Press F4 to switch to Format with the options: dB and Vrms.

7. Press F5 to zoom in/out; the magnification selections are: *1, *2, *5, *10.

8. If the FFT source is CH1, press the red button VOLTS POSITION ,

z One of the following three prompts will appear at the bottom-left of the screen

when the Format selection is set to dB.

— FFT dB level

— CH1 voltage level

— FFT vertical position

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z One of the following two prompts will display at the bottom-left of the screen

when the Format is set to Vrms.

— CH1 voltage level

— FFT vertical position

Press the blue button VOLTS POSITION; the following will appear:

— CH2 OFF

9. If the FFT source is CH2, press the blue button VOLTS POSITION ,

z One of the following three prompts will display at the bottom-left of the screen

when the Format is set to dB.

— FFT dB level

— CH2 voltage level

— FFT vertical position

z One of the following two prompts will display at the bottom-left of the

screen when the Format is set to Vrms.

Press the red button VOLTS POSITION; the following screen will appear:

—CH1 OFF

10. When the FFT source is CH1:

z If the display at the bottom left side of the screen is "

the red buttons VOLTS POSITION▲ and ▼ to adjust the dB value

-FFT dB level ", use

(the DIV selections include 1dB 2dB 5dB 10dB and 20dB).

z If the display at the bottom left side of the screen is "

-CH1 voltage

level", use the red buttons VOLTS POSITION▲ and ▼ to adjust the voltage

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of CH1 ("CH1 2v~ " appears at bottom side of the screen);

z If the display at the bottom left side of the screen is "

—FFT vertical

position", use the red buttons VOLTS POSITION▲ and ▼ to adjust the

position of the waveform along the vertical position. For example, "FFT 1.20

DIV (24.0dB)" indicates that the cursor departs from the center line for 1.20

DIV and "CH1 20dB" is shown on the bottom left side of the screen; the

arithmetic product is 24.0dB.

The operational steps are the same as above for the FFT source CH2:

11. Press the yellow OPTION key, the following prompts appear at the bottom left

side of the screen.

— CH1 horizontal base

— CH1 trigger level

Or

— CH1 horizontal position

— CH1 trigger level

Use the OPTION ◄ and OPTION ► menu buttons to adjust the position of the

waveform along the horizontal position. "FFT -2.00DIV (500.0Hz) " shown on the

bottom left indicates that the starting section of the waveform departs from the

beginning for 2.00DIV (250Hz/DIV). The displayed frequency M is the exact

frequency of the cursor point in the middle of spectrum (shown in Figure 41 below).

Use the OPTION ◄ and OPTION ► buttons to adjust the horizontal base; for

example, "250Hz/DIV （5KS/s".

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Selecting an FFT Window

Figure 41

■ The FFT feature provides four (4) windows. Each is a trade-off between frequency

resolution and magnitude accuracy. What is measured and what the source signal

characteristics are help determine which window to use. Use the following guidelines

to select the best window.

Type Description Window

Rectangle is the ideal window type for resolving
frequencies that are very close to the same value
but least desirable for accurately measuring the
amplitude of those frequencies. It is the ideal type
for measuring the frequency spectrum of aperiodic
signals and measuring frequency components near

Rectangle

DC.

Use rectangle for measuring transients or surges
where the signal level before and after the event
are nearly equal. Also, use this window for equal­amplitude sine waves with frequencies that are
very close and for broadband random noise with a
relatively slow varying spectrum.

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Hamming

This is a good window for resolving frequencies
that are very close to the same value with
somewhat improved amplitude accuracy over the
rectangle window. It has a slightly better frequency
resolution than the Hanning selection.

Use Hamming for measuring sine, periodic, and
narrow band random noise. This window works on
transients or surges where the signal levels before
and after the event are significantly different.

This is a good window for amplitude accuracy but
less so for resolving frequencies.

Hanning

Use Hanning for measuring sine, periodic, and
narrow band random noise. This window works on
transients or surges where the signal levels before
and after the event are significantly different.

This is the best window for measuring the
amplitude of frequencies but least useful for
resolving frequencies.

Blackman

Use Blackman-Harris for measuring predominantly
single frequency waveforms to examine higher
order harmonics.

Fig 42, 43, 44, 45 show four types of window functions referring to a sine wave of

1KHz.

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Fig 42 - Rectangle window

Fig 43 - Blackman window

Fig.44 - Hanning window

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Fig.45 - Hamming window

Quick Tips

 If desired, use the zoom feature to magnify the FFT waveform.

 Use the default dBV RMS scale to see a detailed view of multiple frequencies,

even if their amplitudes vary greatly. Use the linear RMS scale to see an overall

view of how frequencies compare.

 Signals that have a DC component or an offset can cause incorrect FFT

waveform component magnitude values. To minimize the DC component, choose

AC Coupling on the source signal.

 To reduce random noise and aliased components in repetitive or single-shot

events, set the oscilloscope acquisition mode to ‘average’.

NOTE 1:

Nyquist frequency: The highest frequency that a Real Time Digital Oscilloscope

can measure at exactly half the sampling rate is called the Nyquist frequency. If

under-sampling occurs when the frequency sampled is higher than the Nyquist

frequency, “False Wave” phenomenon will occur. The relationship between the

frequency being sampled and measured is of great importance in this context.

NOTE 2:

In FFT mode, the following settings are prohibited:

1) Window set

2) Changing the source channel (in CH1 Setup or CH2 Setup menu)

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3) XY Formatting in the DISPLAY SET mode

4) “SET 50%” (trigger level at the vertical point of the signal amplitude) in the

Trigger setting mode

5) Autoscale

6) Wave recording

7) Measure 1 and Measure 2

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

SYSTEMSTATUSMENU

The system status menu is used to display configuration information concerning

horizontal, vertical, trigger, and other systems. Follow the steps below to check status:

1. Press the MENU key; the function menu will then appear at the right side of the

screen.

2. Press the MENU ▲ or MENU ▼ key to select SYSTEM STAT. Four (4) selectable

options will then appear at the bottom of the screen.

3. Sequentially press F1 through F4 to view the corresponding status information.

Refer to Figure 46.

Figure 46:

System Status

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

MAINTIMEBASEMODE

The time base mode menu is explained as the following table.

Function menu Setting Explanation

Main Time Base Horizontal main time base

Zone Window Use the two cursors to define a zoom window area

Window Full-screen display

To zoom in on a small area of the display, perform the following steps:

1. Press MENU to view the function menu on the right side of the screen.

2. Press MENU ▲ or MENU ▼ to select the TIME MODE. Three (3) selectable options

will then appear at the bottom of the display.

3. Use the Soft-keys F1, F2, and F3 to select the Main Time Base, Zone Window, or

Window functions as described in the Table above.

4. Use the OPTION key and the◄

the Time Base and size of the window zoom.

Refer to Figures 47 and 48.

Figure 47: Original Window Setting

(yellow) and ► (yellow) keys to adjust and vary

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Figure 48: Window Zoom

PCDATATRANSMISSION

For PC data transmission, perform the following steps:

1. Press MENU; the function menu will then appear on the right side of the screen

2. Press MENU ▲ or MENU ▼ to select the display setting mode DISP SET; the

display will show four (4) selectable options at the bottom of the screen

3. Press the F4 key; select Bitmap or Vectors

4. Connect the oscilloscope to the PC using the supplied data transmission cable

5. Install and open the supplied software

6. Use the software as described in the software’s HELP utility

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

User'sGuide



ModelMS46060MHzDigitalOscilloscope

ModelMS42020MHzDigitalOscilloscope



SECTIONTWO:MultimeterOperation

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USING THE MULTIMETER

ABOUTTHISCHAPTER

This chapter provides step-by-step instructions for using the Multimeter functions.
These instructions also provide basic examples of menus and other basic operations.

MAKINGMETERCONNECTIONS

Use the four 4-mm safety banana jack inputs for the Meter functions: COM, V/Ω/C,

10A, mA.

The four (4) banana jack inputs on the face of the meter are, L to R, 10A current, mA
current, COM (ground/negative), and Volts/Resistance/Capacitance

MULTIMETERDISPLAYWINDOW

Figure 1: Multimeter Display Window

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Description

1. Battery status indicator

2. Manual range indicator. In MANUAL mode the user selects the measurement

range

3. Measurement mode indicators:

DCV: DC Voltage measurement

ACV: AC voltage measurement

DCA: Direct current (DC) measurement

ACA: AC current measurement

R: Resistance measurement

: Diode measurement

: Continuity measurement

C: Capacitance measurement

4. Relative measurement mode indicator

5. RUN: Continuous update mode. STOP: Display data hold mode

6. The reference value in the relative measurement mode

7. (X10) reading multiplier

8. Unit of measure indicator and measurement reading

9. Automatic range mode (AUTO). Meter automatically selects measurement range

10. Absolute / Relative measurement modes: The “||” symbols represents absolute

measurement (normal) mode. The “ ” symbol represents the relative mode

11. Manual measurement control (user selects measurement range)

12. Color coded scale indicator; Each test mode has a unique color scheme

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MAKINGMULTIMETERMEASUREMENTS

Press the DMM/OSC key; the oscilloscope will switch to the multimeter mode. The
meter will prompt the user to correctly insert the test leads. Use the A, V, and R keys
to select the desired multimeter function.

MEASURING RESISTANCE

To measure resistance, first remove power from the component or circuit under test

and then follow these steps:

1. Insert the black lead into the COM banana jack input and the red lead into
the V/Ω/C banana jack input

2. Press the R key. An ‘R’ appears at the top of the screen

3. Connect the red and black test leads to the resistor or circuit under test. The
resistance value will appear on the screen (unit of measure: Ohms)

Refer to the example diagram below in Figure 2.

Figure 2: Resistance Measurement

MEASURING DIODE VOLTAGE

To make a measurement on the diode, do the following:

1. Insert the black lead into the COM banana jack input and the red lead into
the V/Ω/C banana jack input

2. Press the R key. An ‘R’ appears at the top of the screen

3. Press the SET key repeatedly until the diode symbol is displayed

4. Connect the red and black leads to the diode and read the displayed voltage
(V)

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5. Reverse the test lead polarity and perform the test again Refer to the
example display screen in Figure 3.

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Figure 3: Diode Measurement

CONTINUITY TEST

To perform a resistance continuity test, refer to the following:

1. Insert the black lead into the COM banana jack input and the red lead into
the V/Ω/C banana jack input

2. Press the R key. An ‘R’ appears at the top of the screen

3. Press the SET key repeatedly until the following is shown on the screen:

4. Connect the red and black leads to the test points. If the resistance value is
lower than 50Ω the meter will emit an audible tone

The meter display will also show the resistance as shown in example Figure 4.

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Figure 4: Continuity Test

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MEASURING CAPACITANCE

To measure Capacitance, refer to the following:

1. Insert the black lead into the COM jack, and the red lead into the V/Ω/C jack

2. Press the R key. An ‘R’ appears at the top of the screen

3. Press the SET key until the C appears at the top of the screen

4. Connect the black and red leads to the capacitor or circuit under test; the

meter will display the reading (Unit of measure: Farad)

Notes: To improve accuracy when the measured value is lower than 5 nF, select the
lowest capacitance range and use the Relative mode.

Please allow approx. 30 seconds for capacitance measurements larger than 40uF.

Refer to the example diagram in Figure 5.

Figure 5: Capacitance Measurement

MEASURING DC VOLTAGE

To measure DC voltage, refer to the following:

1. Insert the black lead into the COM banana jack input and the red lead into
the V/Ω/C banana jack input

2. Press the V key and the DCV symbol will appear at the top of the screen

3. Connect the red and black test leads to the measurement points on the
circuit under test; the voltage value will be displayed on the screen

Refer to the example diagram, Figure 6.

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Figure 6: DC Voltage Measurement

MEASURING AC VOLTAGE

To measure AC voltage, refer to the following:

1. Insert the black lead into the COM banana jack input and the red lead into
the V/Ω/C banana jack input.

2. Press the V key and then press SET so that the ACV symbol appears at the
top of the screen

3. Connect the red and black leads to the measured points and the AC voltage
values of measured points will be displayed on the screen.

Refer to the example diagram in Figure 7.

Figure 7: AC Voltage Measurement

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MEASURING DC CURRENT

To measure a DC current lower than 400 mA, do the following:

1. Insert the black lead into the COM banana jack input and the red lead into the
mA banana jack input

2. Use the A key and the SET key as needed to select the DCA mode (the DCA
symbol will appear at the top of the screen

3. Ensure that the displayed unit of measure on the main reading screen is mA.
Use the F4 soft-key to select mA if necessary.

4. Connect the red and black leads to the measured points on the circuit under test;
the DC current value will be displayed on the screen.

Refer to the example diagram in Figure 8.

Figure 8: 400mA DC Current Measurement

To measure a DC current larger than 400 mA, perform the following:

1. Press the A key and the DCA symbol should appear at the top of the screen.
Use the SET key to select DCA if necessary.

2. Press the F5 soft-key to select the 10A measurement mode, the unit of measure
on the main reading screen should be A.

3. Connect the red and black test leads to the measured points on the circuit under
test; The DC current value will be displayed on the screen.

4. Press the F4 soft-key to return to the mA measurement mode

Refer to the example in Figure 9.

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Figure 9: 10A DC Current Measurement

MEASURING AC CURRENT

To measure AC current lower than 400 mA, perform the following:

1. Insert the black lead into the COM banana jack input and the red lead into the mA

banana jack input

2. Press the A key and then the use the SET key to select the ACA mode. The ACA

symbol will appear at the top of the screen when selected

3. Use the F4 soft-key to select the mA mode

4. Connect the red and black leads to the measured points on the circuit under test;

The AC current value will be displayed on the screen.

Refer to the example in Figure 10.

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Figure 10: 400mA AC Current Measurement

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To measure AC current larger than 400 mA, perform the following:

5. Press the A key and use the SET key to select the ACA mode (ACA symbol will
appear at the top of the screen when selected)

6. Press the F5 soft-key to select the 10A measurement mode, the unit of measure
on the main reading screen should be A

7. Connect the red and black test leads to the measured points on the circuit under
test; The AC current value will be displayed on the screen.

8. Press the F4 soft-key to return to the mA measurement mode

Refer to the example in Figure 11.

Figure 11: AC Current Measurement for 10A

FREEZING THE READINGS (DATA HOLD)

You can hold the displayed readings at any time.

1. Press the RUN /STOP key to freeze the screen. STOP will be displayed at the
top right of the screen

2. Press the RUN /STOP key again to resume normal measurement operation

Refer to the example in Figure 12.

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Figure 12: Freezing the Readings

TAKING A RELATIVE MEASUREMENT

The meter can display a reading ‘relative’ to a user-selectable reference value. Refer

to the following discussion on how to make a relative measurement.

First program a reference value. To do so, take a measurement and when the

desired reading is displayed press the “||/ ” soft-key until the ‘ ’ symbol is displayed

at the top of the screen; this indicates that the unit is in the Relative mode. The

reference value is shown on the display screen just below the relative mode symbol.

Now all subsequent readings in the main display area will be displayed relative to the

reference value.

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SELECTING THE AUTOMATIC / MANUAL RANGE MODES

The default mode of the instrument is the automatic range. To switch to the manual

range, perform the following steps:

1. Repeatedly press the F1 MANUAL soft-key until the desired range is selected on the

meter’s display. MANUAL will be displayed on the upper left hand corner of the

meter’s display when in the manual mode

2. In the manual range mode, the measuring range is increased by one stage with each

press of the F1 key. When the highest range is reached, the meter jumps to the

lowest range

3. Press the F3 soft-key to select the AUTO range mode. AUTO will display on the

upper left side of the screen.

Refer to the display example in Figure 13.

Figure 13: Automatic/Manual Range Adjustment

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FAQ

The oscilloscope does not power up

Check that the battery is charged. If the battery is not charged, plug the AC Adaptor charger

into an AC source and then into the meter. Charge the battery for at least 15 minutes before

using the Oscilloscope. Please contact Extech for service if the instrument fails to power on

after a charge

The oscilloscope shuts down after operating for only several seconds

The battery is most likely very weak or completely drained; Check the displayed battery status

symbol. The

symbol indicates that the battery is exhausted and must be charged.

The meter displays ERR when in the Multimeter mode

The measurement mode is likely not selected. In this case, press any of the three mode keys

V, A or R

The measured voltage value is 10 times larger or smaller than the actual

value indicated in the oscilloscope mode

Check that the channel attenuation level matches the actual probe attenuation ratio

A waveform is displayed on the oscilloscope screen but is not stable

Check whether the signal item in the trigger mode menu matches the actual signal channel.

Check the trigger mode: The edge trigger mode is typically used for most applications; the

video trigger mode is applicable for video signals. Only when the proper trigger mode is

applied can the waveform be stable.

Change the trigger coupling into the HF rejection and LF rejection to filter the HF or LF noise

trigger by the interference.

No display when the RUN/STOP key is pressed in oscilloscope mode

Check whether the trigger mode in the trigger mode menu is in Normal or Single Shot and

whether the trigger level is outside of the waveform’s range.

In such conditions, adjust the trigger level to be in the middle of the range or select the non-

auto trigger mode. Additionally, press the AUTO SET key and re-try the previous suggestions.

95

V5.1‐March2010

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

When using average sampling in the sampling mode or when selecting a long display time in

the oscilloscope display mode, the display speed is slow; this is normal

96

V5.1‐March2010

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

APPENDICES

APPENDIXA:SPECIFICATIONS

OSCILLOSCOPE

Unless otherwise indicated, all technical specifications are applicable to the 10X probe

attenuation switch setting. The oscilloscope should meet the following requirements in

order to meet the published specifications.

■ The instrument should be allowed to run continuously for more than 30 minutes under

the specified operating temperature

■ If the operating temperature is exceeded by more than 5 degrees Celsius, an “Auto-

calibration” must be performed (system function menu)

Sampling

Sampling modes Normal sampling, Peak detection, Average value

Sampling rate 100MS/s (MS420), 250MS/s (MS460)

Input

Input coupling DC, AC

Input impedance 1MΩ ±2% connected in parallel with 20pF ±5pF

Probe attenuation coefficients 1X, 10X, 100X, 1000X

Max. Input voltage 400V (peak)

Channel delay time（typical）

150ps

Horizontal

Sampling rate range

Waveform interpolation

Data record length 6K points for each channel

10S/s～100MS/s

（sin x）/x

Scanning speed range（S/div） 5ns/div～5s/div, steps in “1-2.5-5” mode

Sampling rate relay time
accuracy

Time interval Single: ± (1 sampling interval time + 100ppm × rdg +

±100ppm (time interval equal to or larger than 1ms)

0.6ns)

97

V4.0‐March2010

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( T) measurement
accuracy（full bandwidth）

Average 16 : ± (1 sampling interval time
+100ppm×reading+0.4ns)

98

V4.0‐March2010

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Vertical

Analog digital converterA/D 8 bits resolution (both channels synchronously)

Sensitivity range V/div 5mV/div5V/div(for the BNC connector input

Displacement range

± 10 div (MS420),

±2V(5mV/div~200mV/div),

±50V(500mV/div~5V/div)(MS460)

Analog bandwidth 60MHz (MS460); 20MHz (MS420)

Single bandwidth Full bandwidth

Low frequency response

(A/D coupling, -3dB)

Rise time ≤17.5ns (MS420) , ≤5.8ns (MS460)

DC gain accuracy ±5%

DC measurement (accuracy
average value sampling
mode

Trigger

≥ 5Hz (BNC connector

The voltage difference between any two points on
the waveform after averaging the captured
waveforms is greater than 16: ± (5% reading + 0.05
divisions)

DC

CH1 and CH2: 1div (DCfull bandwidth) Trigger sensitivity

coupling

Edge trigger

AC
coupling

Same as the DC coupling when it is equal
to or larger than 50Hz.

Triggering level range ±6 divisions from the screen center

Triggering level accuracy

±0.3 divisions
(typical) which is applicable
to the signal with rise and
fall time equal to or longer
than 20ns

Trigger displacement 655 divisions for pre-triggering and 4 divisions for post-

triggering

50% level setting (Typical). Operation with the input signal frequency equal to or

larger than 50Hz.

99

V4.0‐March2010