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24

 

V5.1

 ‐ 

March

 

2010

 

 

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 

U

SING 

P

EAK 

D

ETECTION TO 

C

APTURE 

G

LITCHES

 

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. 

 

Summary of Contents for HOS-MS420

Page 1: ...e mail info omega com For latest product manuals omegamanual info Shop online at omega com User sGuide HOS MS420 20mhz Oscilloscope MADE IN CHINA 1 ...

Page 2: ...ce Managed by the United Kingdom Office Toll Free 0800 466 342 TEL 33 0 161 37 29 00 FAX 33 0 130 57 54 27 e mail sales omega fr Germany Austria Daimlerstrasse 26 D 75392 Deckenpfronn Germany Toll Free 0800 6397678 TEL 49 0 7056 9398 0 FAX 49 0 7056 9398 29 e mail info omega de United Kingdom OMEGA Engineering Ltd ISO 9001 Certified One Omega Drive River Bend Technology Centre Northbank Irlam Manc...

Page 3: ...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 ...

Page 4: ...ENU DESCRIPTION 15 SETTING THE TRIGGER POSITION AND TIME BASE 15 OSCILLOSCOPE INPUT CONNECTIONS 19 MEASURE UNKNOWN SIGNALS AUTO SET FEATURE 20 AUTO ZERO THE HORIZONTAL TRIGGER 20 AUTOMATIC RANGING MEASUREMENTS 20 DATA HOLD 21 AVERAGE MODE TO SMOOTH WAVEFORMS 22 PERSISTENCE MODE SUPERIMPOSE WAVEFORMS 22 PEAK DETECT GLITCH CAPTURE 23 AC COUPLING MODE 24 REVERSE WAVEFORM POLARITY 25 MATHEMATICAL FUNC...

Page 5: ...TION TWO MULTIMETER FUNCTIONS 64 CONNECTING THE METER 65 DISPLAY WINDOW 65 RESISTANCE MEASUREMENTS 67 MEASURING DIODE VOLTAGE 67 CONTINUITY TEST 68 MEASURING CAPACITANCE 69 MEASURING DC VOLTAGE 69 MEASURING AC VOLTAGE 70 MEASURING DC CURRENT 71 MEASURING AC CURRENT 72 DATA HOLD FREEZE READINGS 73 RELATIVE MEASUREMENTS 74 AUTOMATIC MANUAL RANGE 75 Copyright 2010 Extech Instruments Corporation a FLI...

Page 6: ...cope 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 ...

Page 7: ...ge the product or external equipment 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 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 ...

Page 8: ...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...

Page 9: ...nt 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 t...

Page 10: ...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 6 ...

Page 11: ...10 V5 1 March 2010 FRONT PANEL AND KEYPAD OVERVIEW Figure 3 ...

Page 12: ...e 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 posit...

Page 13: ...scope 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 displ...

Page 14: ... 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 ...

Page 15: ...e 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 ...

Page 16: ...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 follow...

Page 17: ...o 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 ...

Page 18: ...he 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 ...

Page 19: ...e 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 trig...

Page 20: ...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...

Page 21: ... 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 ...

Page 22: ...LD 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 ...

Page 23: ... 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 Persisten...

Page 24: ...V5 1 March 2010 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 ...

Page 25: ...splayed 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 a...

Page 26: ...aptured 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 updat...

Page 27: ...ptions 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 F...

Page 28: ...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...

Page 29: ...CE 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 ...

Page 30: ...e 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 1...

Page 31: ...nel Probe 1X 10X 100X 1000X Select the desired probe attenuation Inverted OFF ON Waveform is displayed normally 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 comp...

Page 32: ...31 V5 1 March 2010 Figure 20 AC Coupling ...

Page 33: ...ETTING 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 Corresponding Menu Setting 1 1 1X 10 1 10X 100 1 100X...

Page 34: ...3 V5 1 March 2010 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 ...

Page 35: ...unction 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 MA...

Page 36: ...g 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 trigg...

Page 37: ...iggering 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 se...

Page 38: ...hen one trigger is detected sampling then stops Move to the next menu Coupling AC DC HF Rjc LF Rjc The DC component is blocked All components are allowed HF part of the signal is blocked only the LF component is allowed The LF part of the signal is blocked only the HF component is allowed SENS Trigger sensitivity Hold off Move to the Hold off menu Return to previous menu Sensitivity Sensitivity is...

Page 39: ...s described in the following table Function menu Settings Description First screen Polarity Normal Inverted For video signals with low black levels For video signals with high black levels Source CH1 CH2 Select CH1 as the trigger source Select CH2 as the trigger source Sync Synchronization Line Field Set synchronous trigger in video line Set synchronous trigger in video field ...

Page 40: ...elevision 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 NTSC PAL SECAM National Television System Committee standard most common Less common video standard used in Europe Line Increase Decrease The Line value will increase The Lin...

Page 41: ...ernate Trigger The Alternate triggering menu is described in the following tables Function menu Settings Description When EDGE TRIGGERING is selected CH SEL CH1 CH2 Set trigger type and other parameters for Channel 1 Set trigger type and other parameters for Channel 2 Type Edge Video Set vertical channel trigger as edge trigger Set vertical channel trigger as video trigger Edge type Rising Falling...

Page 42: ...on When VIDEO TRIGGERING is selected CH SEL CH1 CH2 Set trigger type and other parameters for CH1 Set trigger type and other parameters for CH2 Type Edge Video Set vertical channel trigger as edge trigger Set vertical channel trigger as video trigger Video type Polarity Normal Inverted For video signals with low black level For video signals with high black level Sync Synchronization Line Field Od...

Page 43: ...d 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 Increase Decrease 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...

Page 44: ...ption 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 oscill...

Page 45: ...al 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 wil...

Page 46: ...or best results the waveform must be repetitive Averages 4 16 64 or 128 Select the number of samples to average DISPLAY SETTING The Display Setting menu is described in the following table Function menu Settings Description Type Vectors Dots Shows the waveform as a smooth line connecting each data point Shows the waveform as a collection of independent data points Persist OFF 1s 2s 5s Infinite Set...

Page 47: ...10 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 ...

Page 48: ...n 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 ...

Page 49: ...48 V5 1 March 2010 convenient for viewing the phase relationship between CH1 and CH2 if the oscilloscope does not detect triggering the data appear in light spots ...

Page 50: ...with the present waveform The recalled waveforms cannot be adjusted The waveform Store Recall menu is described in the following Table Function menu Setups Description Source CH1 CH2 MATH Select the signal source of the waveform to save the waveform to save must be on the display WAVE A B C and D Select the memory address for saving or recalling data Save Store the waveform of the selected signal ...

Page 51: ...o 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 ...

Page 52: ...lect 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 en...

Page 53: ...d 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 ...

Page 54: ...equency of CH1 Measure the frequency of CH2 Period CH1 CH2 Measure the period of CH1 Measure the period of CH2 Mean CH1 CH2 Measure the average value of CH1 Measure the average value of CH2 Peak Peak CH1 CH2 Measure the peak to peak value of CH1 Measure the peak to peak value of CH2 Cyc RMS CH1 CH2 Measure Root Mean Square RMS value of CH1 Measure Root Mean Square RMS value of CH2 Vmax CH1 CH2 Mea...

Page 55: ...1 CH2 Measure the Width of CH1 Measure the Width of CH2 Duty CH1 CH2 Measure the Duty of CH1 Measure the Duty of CH2 Duty CH1 CH2 Measure the Duty of CH1 Measure the Duty of CH2 DelayA B CH1 CH2 Measure the DelayA B of CH1 Measure the DelayA B of CH2 DelayA B CH1 CH2 Measure the DelayA B of CH1 Measure the DelayA B of CH2 To measure the frequency of CH1 with MEAS SET 1 and the frequency of CH2 wit...

Page 56: ... 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...

Page 57: ... measure CH1 voltage 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 refe...

Page 58: ...57 V5 1 March 2010 Fig 32 Autoscale Horizontal Vertical multi period waveforms Fig 33 Autoscale Horizontal Vertical mono period waveform ...

Page 59: ...58 V5 1 March 2010 Fig 34 Vertical mode multi period waveform Fig 35 Horizontal mode multi period waveform ...

Page 60: ...er 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 ...

Page 61: ...ment 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 k...

Page 62: ...ement 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 c...

Page 63: ...e 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 ...

Page 64: ...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 f...

Page 65: ...V 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 ...

Page 66: ...e 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 FFT ON OFF Turn on FFT function Turn off FFT function Source CH1 CH2 Select CH1 as FFT source Select CH2 as FFT source Window ...

Page 67: ... 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...

Page 68: ...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 FFT dB level use the red buttons VOLTS POSITION and to ad...

Page 69: ...ame 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 se...

Page 70: ...s 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 DC Use rectangle for measuring transients or surges where the signal level before and after the event are nearly ...

Page 71: ...e significantly different Hanning This is a good window for amplitude accuracy but less so for resolving frequencies 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 Blackman This is the best window for measuring the amplitude of frequencies but least useful ...

Page 72: ...71 V5 1 March 2010 Fig 42 Rectangle window Fig 43 Blackman window Fig 44 Hanning window ...

Page 73: ...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 Fal...

Page 74: ...5 1 March 2010 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 ...

Page 75: ...low 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 ...

Page 76: ...rm 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 yellow and yellow keys to adjust ...

Page 77: ...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 ...

Page 78: ...77 V5 1 March 2010 User s Guide Model MS460 60 MHz Digital Oscilloscope Model MS420 20 MHz Digital Oscilloscope SECTION TWO Multimeter Operation ...

Page 79: ...78 V5 1 March 2010 ...

Page 80: ...ovide 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 ...

Page 81: ...ent 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 ...

Page 82: ...ana 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 ...

Page 83: ...82 V5 1 March 2010 5 Reverse the test lead polarity and perform the test again Refer to the example display screen in Figure 3 ...

Page 84: ... 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 ...

Page 85: ...84 V5 1 March 2010 Figure 4 Continuity Test ...

Page 86: ... 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 j...

Page 87: ... 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 ...

Page 88: ...ts 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 m...

Page 89: ...88 V5 1 March 2010 ...

Page 90: ...nd 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 ...

Page 91: ...90 V5 1 March 2010 Figure 10 400mA AC Current Measurement ...

Page 92: ...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 di...

Page 93: ...rement 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 relati...

Page 94: ...splay 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 t...

Page 95: ...94 V5 1 March 2010 ...

Page 96: ...alue 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 applica...

Page 97: ...96 V5 1 March 2010 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 ...

Page 98: ...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 10S s 100MS ...

Page 99: ...98 V4 0 March 2010 T measurement accuracy full bandwidth Average 16 1 sampling interval time 100ppm reading 0 4ns ...

Page 100: ... The voltage difference between any two points on the waveform after averaging the captured waveforms is greater than 16 5 reading 0 05 divisions Trigger DC coupling CH1 and CH2 1div DC full bandwidth Trigger sensitivity 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 typica...

Page 101: ...ts NTSC PAL and SECAM broadcasting systems of any field or line frequency Measurement Cursor measurements Voltage difference and time difference between cursors Auto measurements Peak to Peak voltage mean voltage root mean square value frequency and period MS420 0nly Vmax Vmin Vtop Vbase Width Overshoot Pre shoot Rise time Fall time Width Width Duty Duty Delay A B Delay A B ...

Page 102: ...f 17 5pf Input voltage 150 V DC 300 V DC MULTIMETER Voltage VDC Input Impedance 10MΩ Max Input Voltage 1000V DC or AC peak to peak value Range Accuracy Resolution 400 0mv 1 5 2 digit 100uV 4 000V 1mV 40 00V 10mV 400 0V 1 1 digit 100mV Voltage VAC Input Impedance 10MΩ Max Input Voltage 750V AC Frequency range from 40Hz to 400Hz Range Accuracy Resolution 4 000V 1mV 40 00V 10mV 400 0V 1 3 digits 100m...

Page 103: ...102 V4 0 March 2010 Range Accuracy Resolution 40 00mA 1 5 1 digit 10uA 400 0mA 1 5 1 digit 100uA 10A 3 3 digit 10mA ...

Page 104: ...ance Range Accuracy Resolution 400 0 Ω 1 3 digit 0 1Ω 4 000KΩ 1Ω 40 00KΩ 10Ω 400 0KΩ 100Ω 4 000MΩ 1 1 digit 1KΩ 40 00MΩ 1 5 3 digit 10KΩ Capacitance Range Accuracy Resolution 51 20nF 10pF 512 0nF 100pF 5 120uF 1nF 51 20uF 10nF 100uF 3 3 digit 100nF Diode Voltage reading 0 V 1 5 V Continuity Test Audible tone when resistance is lower than 50Ω ...

Page 105: ...wer supply 100 240 V AC 50 60Hz Power output 8 5 VDC Current output 1500 mA Ambient Environmental Specifications Temperature Operation Temperature On Battery power 0 to 50 C 32 to 122 F With Power adapter 0 to 40 C 32 to 104 F Storage Temperature 20 to 60 C 4 to 140 F Relative Humidity and Temperature Operation 0 to 10 C 32 to 50 F no condensation 10 to 30 C 50 to 86 F 95 30 to 40 C 86 to 104 F 75...

Page 106: ... of the instrument according to the following steps 1 Wipe the outside of the instrument and the probe using a soft cloth Use care when cleaning the LCD display screen 2 Use a slightly damp cloth and mild detergent when cleaning and only clean the instrument when it is powered down Do not use abrasive chemical detergents Warning Before use please confirm that the instrument is dry so as to avoid e...

Page 107: ...pter The charging speed can be increased by turning off the meter Note To avoid battery overheating during charging do not charge the meter in an area where the ambient temperature exceeds the specified operating temperature Note The meter can be charged for extended periods After it is charged it switches to a low charge status and may remain in the charging configuration for extended periods REP...

Page 108: ...of the screen 3 Use the F4 key to select the MISC option and the system time along with other information will appear as shown below 4 Press OPTION to enter the Time setting mode The highlighted field can be edited 5 Use the and keys to highlight a value for editing Use the and arrow keys to change the corresponding value for year month date hours minutes and second 6 Press the MENU up arrow key t...

Page 109: ...ise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Shoul...

Page 110: ...tors 䡺 Turbine Paddlewheel Systems 䡺 Totalizers Batch Controllers pH CONDUCTIVITY 䡺 pH Electrodes Testers Accessories 䡺 Benchtop Laboratory Meters 䡺 Controllers Calibrators Simulators Pumps 䡺 Industrial pH Conductivity Equipment DATA ACQUISITION 䡺 Data Acquisition Engineering Software 䡺 Communications Based Acquisition Systems 䡺 Plug in Cards for Apple IBM Compatibles 䡺 Data Logging Systems 䡺 Reco...

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