Extech Instruments 420 Especificaciones

1User'sGuide  Digital 20MHz and 60MHz Oscilloscopes Model MS460 - 60MHz Model MS420 - 20MHz

10V5.1‐March2010FRONTPANELANDKEYPADOVERVIEW Figure 3

100V4.0‐March2010Trigger sensitivity (Video triggering and typical mode) 2 divisions of peak-to-peak value Signal system and line/field frequenc

101V4.0‐March2010Probe 1X position 10X position Bandwidth Up to 6 MHz (DC) Up to full bandwidth (DC) Attenuation rate 1: 1 10: 1 Compens

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

103V4.0‐March2010Alternating Current (AC) Range Accuracy Resolution 40.00mA ±1.5% ±3 digit 10uA 400.0mA ±2% ±1 digit 100uA 10A ±5% ±3digit

104V4.0‐March2010GENERAL SPECIFICATIONS Dimensions 7.1 x 4.5 x 1.6” (18 × 11.5 × 4cm) Weight 1.4 lbs. (645 g) Power consumption  6 W Display

105V4.0‐March2010APPENDIXB:MAINTENANCEANDCLEANINGMAINTENANCE Do not store or place this instrument where the liquid crystal display (LCD) m

106V4.0‐March2010APPENDIXC:CHARGINGTHEINSTRUMENTThe lithium battery may ship un-charged. The battery must be initially charged for 4 hours

107V4.0‐March2010APPENDIXD:SETTHEREAL‐TIMECLOCK1. Press the MENU key; the function menu will display on the right side of the screen. 2. U

108V4.0‐March2010Product Support Technical Support: [email protected] -- Calibration and Repairs: [email protected] Product specifications su

109V4.0‐March2010AppuideproduitServiced’assistancetechnique[email protected]‐Réparationsetretours:[email protected]Spécificationsp

11V5.1‐March2010Description of Meter Front Panel and Keypad (Figure 3) 1. AC adapter Port 2. RS-232C Port 3. USB Port 4. USB Mass Storage Por

12V5.1‐March2010BASIC OSCILLOSCOPE FUNCTIONS ABOUTTHISCHAPTERThis chapter provides introductory Oscilloscope instructions. This introduction

13V5.1‐March2010Description of Oscilloscope Display Screen (Figure 4) 1. Battery power status icon (, , and ) 2. Auto measurement screen

14V5.1‐March201013. The coupling mode for CH2; “~” AC, “-” DC, and ground 14. The vertical Voltage units scale for CH2 15. The coupling mode

15V5.1‐March2010MENUDESCRIPTIONThe following explains how to navigate the menus to select a function. 1. Press the MENU key to open the Funct

16V5.1‐March2010 Figure 6 2. Press ◄ (yellow) or ► (yellow) to adjust the main time base. Press ▲ (yellow) or▼ (yellow) to adjust the trigger h

17V5.1‐March2010When triggering in the Alternate trigger mode: 7. Press OPTION and the following will appear: —Time —Trig 2 See Figure 8:

18V5.1‐March2010 Figure 9: 9. Press ◄ (yellow) or ► (yellow) to adjust the main time base and press ▲ (yellow) or▼ (yellow) to adjust the trigg

19V5.1‐March2010RECALLTHEFACTORYDEFAULTSETTINGSTo reset the Oscilloscope to the factory default settings, refer to the following: 1. Pres

2V5.1‐March2010INTRODUCTION Congratulations on your purchase of the Extech Digital Oscilloscope. This manual is divided into two sections: Secti

20V5.1‐March2010MEASUREUNKNOWNSIGNALSUSINGTHEAUTO‐SETFEATUREThe Auto-Set feature allows the Oscilloscope to measure and display unknown

21V5.1‐March2010Refer to Figure 11: Figure 11: Automatic Scope Measurements DATAHOLD(FREEZINGTHEDISPLAYEDREADING)To freeze any displaye

22V5.1‐March2010USINGTHEAVERAGEMODETOSMOOTHWAVEFORMSUse the Average mode to smooth the displayed waveform; multiple data samples will be

23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

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 des

25V5.1‐March2010 Figure 15: Peak Detection Glossary of Terms • Collecting mode: The oscilloscope converts the collected analog data into digit

26V5.1‐March2010After a reset, the Oscilloscope is dc-coupled so that ac and dc voltages appear on the screen. Use ac-coupling to observe a sma

27V5.1‐March2010 Figure 17: Inverted Waveform USINGMATHEMATICALFUNCTIONSONWAVEFORMSWhen adding (CH1 + CH2), subtracting (CH1 – CH2, CH2 –

28V5.1‐March20105. Press▲(yellow) or ▼(yellow) to adjust the vertical display position of waveform M. Press ◄(yellow) or ►(yellow) to adjust th

29ADVANCED OSCILLOSCOPE FUNCTIONS ABOUTTHISCHAPTERAdvanced Oscilloscope functions are covered in this chapter. VERTICALSETTINGSFORCH1ANDCH2

3V5.1‐March2010TABLE OF CONTENTS GENERAL INFORMATION WARRANTY 5 PRODUCT CONTENTS 6 SAFETY INFORMATION 7 INPUT CONNECTIONS 10 FRONT PANEL AND CON

30V5.1‐March2010 The following Table describes the Vertical Channel menu: Function menu Setting Description Coupling AC DC The dc component in

31V5.1‐March2010 Figure 20: AC Coupling

32V5.1‐March2010 Figure 21: DC Coupling OPEN AND CLOSE MEASUREMENT CHANNELS CH1 will be used in this example. Press the F2 Channel key and the

33V5.1‐March2010INVERT A WAVEFORM Inverted waveform: The displayed signal reverses 180 degrees relative to ground. Press F4 Invert to invert th

34V5.1‐March2010WAVEMATHFUNCTIONMENUSETTINGSThe WAVE MATH functions show the calculation results (adding, subtracting, multiplying or divi

35V5.1‐March2010 Figure 22: Waveform Mathematics SETTINGTHETRIGGERSYSTEMThe trigger determines when the acquisition and display of waveform

36V5.1‐March2010TRIGGERINGCONTROLThere are three triggering modes: Edge triggering, Video triggering, and Alternating triggering. Each trigge

37V5.1‐March2010The Edge triggering menu is described in the following table Function menu Settings DescriptionSlope Rising Falling Triggering

38V5.1‐March2010 Figure 24a (screen 1) and 24b (screen 2): Odd Field Video Trigger Fig. 25: Video Line trigger (screen 1) Fig.

39V5.1‐March2010Odd field Even field Line NUM Set synchronous trigger in video odd line Set synchronous trigger in video even line Set synchr

4V5.1‐March2010DISPLAY SETTINGS 40 STORING WAVEFORMS IN THE METER 42 FUNCTION SETTINGS MENU 43 AUTO CALIBRATION. 44 AUTO RANGE MEASUREMENTS 44

40V5.1‐March2010ALTERNATE TRIGGER In Alternate trigger mode, the trigger signal is taken from two vertical channels. Alternate trigger mode can

41V5.1‐March2010Coupling AC DC HF Rjc LF Rjc The DC component is blocked All components are allowed to pass The HF part of the signal is bl

42V5.1‐March2010Line NUM Set synchronous trigger in video Line NUM When the sync is Line, Field, Odd Field, Even Field, the menu is as follows

43V5.1‐March2010When the ‘Hold-off’ menu is accessed the screen will appear as below:Figure 27b: ‘Hold-off’ menu screen (MS420) Refer to the

44V5.1‐March2010Glossary of Terms • Hold-off time: Programmable time period between trigger events (100ns default). • Trigger modes: There a

45V5.1‐March2010ACQUISITIONMODEThe Acquiring Mode menu is described in the Table shown below. Function menu Settings Description Sample T

46V5.1‐March2010XY vertical axis Carry Bitmap Vectors Data transmitted in bitmap format (dots) Data transmitted in vector format (line) DISPLA

47V5.1‐March2010 Figure 28: Dot Style Figure 29: Vector Style PERSISTENCE The user can select the duration of time that past traces remain on

48V5.1‐March2010convenient for viewing the phase relationship between CH1 and CH2; if the oscilloscope does not detect triggering the data appe

49V5.1‐March2010Description of Control Keys: The CH1 VOL and CH1 ZERO keys for CH1 are used to set the horizontal scale and position. The

5V5.1‐March2010PRODUCT CONTENTS (REFER TO THE FIG. 1 BELOW) 1. MS420 / MS460 Instrument 2. AC Adaptor 3. Oscilloscope Probes (2); Grey in colo

50V5.1‐March20102. Use the MENU ▲ or MENU ▼ key to select Wave Save. Four (4) selectable options will then appear at the bottom of the screen.

51V5.1‐March2010Refer to Figure 30: Figure 30: Save and Recall Waveforms FUNCTIONSETTINGMENU(REFERTOTABLEBELOW)Press the MENU button an

52V5.1‐March2010and probes from the oscilloscope 3. After removing all cables, press F2 (Auto calibration) again. The Auto-calibration automati

53V5.1‐March2010AUTOMATICRANGINGMEASUREMENTSThe oscilloscope can perform twenty (20) automatic measurements: Frequency, cycle, average, pea

54V5.1‐March2010Overshoot CH1 CH2 Measure the Overshoot of CH1 Measure the Overshoot of CH2 Preshoot CH1 CH2 Measure the Preshoot of CH1 Measur

55V5.1‐March2010options will then appear at the bottom of the screen 3. Press the F1 key to select the frequency measurement of CH1. The measur

56V5.1‐March2010 Horizontal HORI—VERT changing horizontal setting Adjust horizontal scale without changing vertical setting Adjust the vertica

57V5.1‐March2010 Fig 32: Autoscale Horizontal - Vertical multi-period waveforms Fig 33: Autoscale Horizontal - Vertical mono-period waveform

58V5.1‐March2010 Fig 34: Vertical mode multi-period waveform Fig 35: Horizontal mode multi-period waveform

59V5.1‐March2010Notes: 1. In Autoscale mode the meter can automatically set the Trigger mode (Edge, Video, and Alternate) and Type (Edge, Vide

6V5.1‐March2010SAFETY INFORMATION Please read the user manual before use to ensure safety and precision SAFETYSYMBOLSANDTERMSSAFETY SYMBOL

60V5.1‐March2010CURSORMEASUREMENTSTwo cursors can be used to make instantaneous Time and Voltage measurements for CH1 and CH2 signals. Refer

61V5.1‐March2010 Figure 36-a: Use the Cursor for a Voltage Measurement When the MENU button is pressed, the data table appears as shown in Figu

62V5.1‐March20105. Press OPTION and the display will show: —Cursor 2 —Cursor 1 Press ▲ (yellow) or ▼ (yellow) to move T1 le

63V5.1‐March2010SIX(6)DIGITFREQUENCYCOUNTER(CYMOMETER)MS460ONLYThe frequency counter measurement range is 2Hz~60MHz. When the meter is

64V5.1‐March2010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

65V5.1‐March2010USINGFFT(FASTFOURIERTRANSFORM)(MS420ONLY)FFT breaks down signals into component frequencies, which the oscilloscope uses

66V5.1‐March2010Zoom *1 *2 *5 *10 Set multiple *1 Set multiple *2 Set multiple *5 Set multiple *10 The steps below instruct on the operation o

67V5.1‐March2010z One of the following two prompts will display at the bottom-left of the screen when the Format is set to Vrms.

68V5.1‐March2010of CH1 ("CH1 2v~ " appears at bottom side of the screen); z If the display at the bottom left side of the screen is

69V5.1‐March2010 Figure 41 Selecting an FFT Window The FFT feature provides four (4) windows. Each is a trade-off between frequency resoluti

7V5.1‐March2010GENERALSAFETYINFORMATIONCarefully read the following safety information in order to avoid personal injury and damage to this

70V5.1‐March2010Hamming This is a good window for resolving frequencies that are very close to the same value with somewhat improved amplitude

71V5.1‐March2010Fig 42 - Rectangle window Fig 43 - Blackman window Fig.44 - Hanning window

72V5.1‐March2010Fig.45 - Hamming window Quick Tips  If desired, use the zoom feature to magnify the FFT waveform.  Use the default dBV RMS

73V5.1‐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 Tr

74V5.1‐March2010SYSTEMSTATUSMENUThe system status menu is used to display configuration information concerning horizontal, vertical, trigge

75V5.1‐March2010MAINTIMEBASEMODEThe time base mode menu is explained as the following table. Function menu Setting Explanation Main Time

76V5.1‐March2010 Figure 48: Window Zoom PCDATATRANSMISSIONFor PC data transmission, perform the following steps: 1. Press MENU; the function

77V5.1‐March2010User'sGuide  ModelMS460 60MHzDigitalOscilloscopeModelMS420 20MHzDigitalOscilloscopeSECTIONTWO:Multi

78V5.1‐March2010

79V5.1‐March2010USING THE MULTIMETER ABOUTTHISCHAPTERThis chapter provides step-by-step instructions for using the Multimeter functions. The

8V5.1‐March2010applications and as V dc for DC applications. Overvoltage Category II refers to local level applicable for appliances and portab

80V5.1‐March2010Description 1. Battery status indicator 2. Manual range indicator. In MANUAL mode the user selects the measurement range 3.

81V5.1‐March2010MAKINGMULTIMETERMEASUREMENTSPress the DMM/OSC key; the oscilloscope will switch to the multimeter mode. The meter will promp

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.

83V5.1‐March2010 Figure 3: Diode Measurement CONTINUITY TEST To perform a resistance continuity test, refer to the following: 1. Insert the

84V5.1‐March2010Figure 4: Continuity Test

85V5.1‐March2010MEASURING CAPACITANCE To measure Capacitance, refer to the following: 1. Insert the black lead into the COM jack, and the red

86V5.1‐March2010 Figure 6: DC Voltage Measurement MEASURING AC VOLTAGE To measure AC voltage, refer to the following: 1. Insert the black le

87V5.1‐March2010MEASURING DC CURRENT To measure a DC current lower than 400 mA, do the following: 1. Insert the black lead into the COM bana

88V5.1‐March2010

89V5.1‐March2010 Figure 9: 10A DC Current Measurement MEASURING AC CURRENT To measure AC current lower than 400 mA, perform the following: 1.

9V5.1‐March2010INPUT CONNECTIONS INPUTCONNECTIONS See Figure 2 below Figure 2 Description 1. The power adapter is use to supply AC power a

90V5.1‐March2010Figure 10: 400mA AC Current Measurement

91V5.1‐March2010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

92V5.1‐March2010 Figure 12: Freezing the Readings TAKING A RELATIVE MEASUREMENT The meter can display a reading ‘relative’ to a user-selectable

93V5.1‐March2010SELECTING THE AUTOMATIC / MANUAL RANGE MODES The default mode of the instrument is the automatic range. To switch to the manua

94V5.1‐March2010

95V5.1‐March2010FAQ The oscilloscope does not power up Check that the battery is charged. If the battery is not charged, plug the AC Adaptor c

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 di

97V4.0‐March2010APPENDICES APPENDIXA:SPECIFICATIONSOSCILLOSCOPE Unless otherwise indicated, all technical specifications are applicable to th

98V4.0‐March2010( T) measurement accuracy（full bandwidth） Average 16 : ± (1 sampling interval time +100ppm×reading+0.4ns)

99V4.0‐March2010Vertical Analog digital converterA/D 8 bits resolution (both channels synchronously) Sensitivity range V/div 5mV/div5V/d