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MS420
Operating Manual
51 pgs855.58 Kb0
Instruction Manual
74 pgs1.3 Mb0
Data Sheet
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Extech MS420 Operating Manual

User Manual
Handheld Digital Storage
Oscilloscope & Multimeter
Model MS400
Figure 1 – Meter Faceplate
Warranty
p
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warr ant y a ppli es to s ens ors and cabl es ). I f it sho uld bec ome n ec ess ary to re tur n the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, i s expressed or implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Care Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy.
Support line (781) 890-7440
Technical Support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Product specifications subject to change without not ice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Cor
oration, 285 Bear Hill Rd., Waltham, MA 02451
2
Table of Contents
Chapter Page
Safety Information 5
Safety Terms and Symbols 5 Specific Warning and Caution Terms 5 Terms Used With This Product 5 Symbols Used With This Product 5 General Safety Information 5
General Inspection 7
Performing a General Inspection 7 Checking for Shipping Damage 7 Checking Accessories 7 Complete Instrument Check 7 Contents of the Meter Kit 7
Input Connections 8
Input Connections 8 Description of the Front Panel and Keys 8
Using the Scope 11
About this Chapter 11 Powering-Up the Oscilloscope 11 Oscilloscope Operation Window 11 Navigating a Menu 13 Manually Setting the Vertical System, Horizontal System and Trigger Position 14 Resetting the Oscilloscope 17 Input Connections 17 Displaying an Unknown Signal with Auto Set 18 Automatic Zero-ing of Trigger Horizontal Position and Trigger Level Position 18 Automatic Measurements 18 Freezing the Screen 19 Using Average for Smoothing Waveforms 19 Using ‘Persistence’ to Display Waveforms 20 Using Peak Detection to Display Glitches 20 Selecting AC-coupling 21 Reversing the Polarity of the Displayed Waveform 22 Using Waveform Math Functions 23
Using the Multimeter 24
About this Chapter 24 Meter Connections 24 Multimeter Operation Window 24 Multimeter Measurements 26 Measuring Resistance Values 26 Diode Measurement 26 Continuity Tests 26 Capacitance Measurement 27 DC Voltage Measurement 27 AC Voltage Measurement 27 DC Current Measurement 28 AC Current Measurement 28 Freezing the Readings 29 Taking a Relative Measurement 29 Selecting Automatic/Manual Range Adjustment 30
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Advanced Oscilloscope FUNCTIONS 31
About this Chapter 31 Setting the Vertical CH1 and CH2 31 Setting the Channel Coupling 32 Enabling the Scope Channels 33 Adjusting the Probe Scale 33 Inverting a Waveform 33 Math Function Menu Settings 33 Setting the Trigger System 34 Triggering Control 35 Edge Triggering 35 Video Triggering 36 ‘Acquire Mode’ Setting 37 Display Settings 37 Display Style 38 Persistence Mode 38 XY Mode 39 Saving Waveforms 39 Function Setting Menu 40 Automatic Measurements 40 Cursor Measurements 41 System State Menu 43 Setting Time Base Mode 44 Data Transmission – PC Interface 45
Trouble Shooting 46 Appendix 47
Appendix and Specifications 47 Oscilloscope 47 Meter 49 General Specifications 50 Appendix B: Maintenance and Cleaning 51 Common Maintenance 51 Storage of Oscilloscope 51 Replacing the Lithium Battery Unit 51
4
Safety Information
Note: Please read this user manual prior to operating the unit.
Safety Terms and Symbols
Specific Warning and Caution terms that appear throughout the manual
Warning: “Warning” identifies conditions and actions that pose hazards to users.
Caution: “Caution” identifies conditions and actions that may damage the product.
Terms printed on the meter and contained in this manual
The following terms may appear on the product or anywhere throughout the associated manuals:
Danger: The term “Danger” is used in this manual to indicate that serious injury or
death may result if the safety instructions are not followed.
Warning: The term “Warning” is used in this manual to indicate that personal injury may
result if instructions are not followed.
Notice: The term “Notice” is used in this manual to indicate that damages to product,
other properties, or accessories may result if instructions are not followed.
Symbols Used on this Product and in the documentation
The following symbols may be found on the meter and in associated documentation:
High Voltage Refer to
User Manual
Protective
Ground
Measurement
Ground
Casing
Ground
General Safety Information
Carefully read the following safety information in order to avoid any personal injury and damage to this product or to any products associated with its use. In order to lessen the chances of any possible dangers that may occur in connection with the use of this product, the product should only be used in the specified applications the product was designed and intended for.
Warning:
To avoid fire or electrical shock please use the proper power adapter. Use only the power adapter recommended by the manufacturer.
Warning:
If test tool inputs are connected to more than 42V peak (30Vrms) or used in circuits of more than 4800VA, adhere to the following guidelines in order to avoid fire or electrical shock:
● Use only insulated voltage probes, test leads and the adapter supplied with the test tool, or indicated by Extech as suitable for the Oscilloscope & Multimeter.
● Before use inspect voltage probes, test leads and accessories for mechanical damage and replace when required.
● Remove all probes, test leads and accessories that are not in use.
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● Always connect the power adapter first to the AC outlet before connecting it to the Oscilloscope & Multimeter.
● Do not apply voltages that differ more than 400V from earth ground to any input when measuring in a CAT III environment.
● Do not apply voltages that differ more than 400V from earth ground to any input when measuring in a CAT II environment.
● Do not apply voltages that differ more than 400V from each other to the isolated input when measuring in a CAT III environment.
● Do not apply voltages that differ more than 400V from each other to the isolated inputs when measuring in a CAT II environment.
● Do not apply input voltages above the rating of the instrument. Use caution when using 1:1 test leads because 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 connectors.
● Always use the Oscilloscope & Multimeter only in the manner specified.
● Voltage ratings that are mentioned in the warning are provided as limits for
“working voltage”. The representative Vac rms (50-60Hz) indicates AC sine wave applications and as Vdc for DC applications. Overvoltage Category III refers to distribution level and fixed installation circuits inside a building. Overvoltage Category II refers to local levels, which are applicable for appliances and portable equipment.
Only qualified technical personnel should perform maintenance. Pay attention to the nominal values of all terminals: To avoid fire or electric
shock, please keep a watchful eye on all nominal values and marks specified on this product. Before any connections are made, carefully read the user’s manual of the product for further information of nominal values.
DO NOT operate this product without the instrument cover plate in place: If the
cover plate or panel has been removed, do not perform any operations with this product.
DO NOT come into contact with bare conductors: When the product is powered
on, do not touch any bare joints or parts of the meter.
DO NOT operate this product in case of any undetermined failure: When in
doubt of the cause of any damage to this product, consult qualified technical personnel.
Keep the product well ventilated: Refer to the user manual for detailed installation
instructions. Make sure the product is operated in a well ventilated area.
DO NOT operate this product in humid conditions. DO NOT operate this product where explosives are handled or used.
Keep the product surface clean and dry.
6
General Inspection
After purchasing a new MS400 oscilloscope, it is suggested that a general inspection of the instrument be performed according to the following steps:
Check whether there is any damage to the product caused by shipping
If the packing material, boxes or foam cushions are found in a damaged condition, keep them in a proper place until the complete instrument and accessories have passed electrical and mechanical tests.
Check the Accessori es
Double check the accessory list and pictures of the parts and accessories included with your instrument. Check whether there is any accessory loss by referencing the Appendix. In case of any accessory loss, damage or variation in specifications, contact the organization where the product was purchased.
Check the Ins tru m e nt
If the instrument is apparently damaged, fails in normal operation or in a performance test, consult the place of purchase. If the instrument is damaged due to shipping, keep the packing material in a proper place and contact the place of purchase.
Contents of the meter kit
Description Standard Optional
Meter ●
Adapter ●
Two (2) Oscilloscope Probes (grey) ●
Pair of Test Leads for Multimeter (black and red) ●
Measuring Extension Module for Low Current ●
Measuring Module for low range Capacitance ●
Adjustment Probe Tool ●
One (1) USB Data Transmission cable ●
User Manual ●
One (1) disk that includes the PC interface software
Carrying Case ●
●
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Input Connections
Figure 2
Description:
1. AC power adapter for AC power supply and battery recharging
2. Multimeter test leads
3. Multimeter input jacks, including three circular banana jacks and two square jacks. The three circular jacks are used for voltage, current and resistance inputs, while the two square jacks are used for capacitance inputs
4. Oscilloscope probes
5. Oscilloscope channel inputs: The upper one is for Channel 1 (CH1) while the lower one is for Channel 2 (CH2)
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Description of the Front Panel and the Keypad
132
4
20
5
9
6
7
8
Description:
1. Power adapter jack
2. Serial port
3. USB jack
4. Backlight switch
5. POWER: Power switch
14 12 15
11
13
19
18
17
10
16
Figure 3
6. A: Multimeter current measurement key
7. V: Multimeter voltage measurement key
8. R: Multimeter resistance, diode, On/Off and capacitance measurement key
9. OSC LEFT: Oscilloscope left-direction adjustment key
10. OSC RIGHT: Oscilloscope right-direction adjustment key
11. OSC OPTION: Oscilloscope setting key
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Using the four keys OSC LEFT, OSC RIGHT, OSC UP and OSC DOWN, users
can make the following settings by pressing OSC OPTION. The settings include: Voltage Unit Scale for Channel 1 (CH1 VOL); Voltage Unit Scale for Channel 2 (CH2 VOL); Primary Time base (TIME BASE), zero point position for Channel 1 (CH1 ZERO), zero point position for Channel 2 (CH2 ZERO), trigger horizontal position (TIME) and trigger level position (TRIG).
When performing Waveform Calculations, users can also adjust and calculate the
Display Multiplying Factor of a Waveform (CHM VOL) and the vertical display position (CHM ZERO).
In cursor measurement mode, users can adjust the positions of Cursor 1 (V1 or
T1) and Cursor 2 (V2 or T2).
12. OSC DOWN: Oscilloscope display downward adjustment key.
13. OSC UP: Oscilloscope display upward adjustment key.
14. OSC/DMM: Press to switch between oscilloscope and multimeter.
15. AUTO SET:
In the Multimeter Mode, when performing a current or voltage measurement, the
user can switch between AC and DC with this key; when performing a resistance measurement, the user can select resistance, diode, On/Off or a capacitance measurement with this key.
This key is used for auto setting in the oscilloscope operation mode.
16. RUN/STOP: key for starting or stopping an operation.
17. MENU DOWN: Move down the menu list.
18. MENU: Show / Hide the menu.
19. MENU UP: Move up the menu list.
20. F1～F5: Switch or Adjustment options for each menu
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Using the Scope
About this Chapter
This chapter provides a step-by-step introduction to the oscilloscope’s functionality. The introduction does not cover all of the capabilities of the scope functions but gives basic examples to show how to use the menus and perform basic operations.
Power-Up the Oscilloscope
Connect the oscilloscope to AC power via the power adapter as shown in Figure 2 Turn the oscilloscope on by pressing the power on/off key POW. The instrument then performs a self-check. A greeting window with “press any key to
continue.” displays after the self-check.
The user can press any key to enter the measurement functions. The oscilloscope powers up in the last setup configuration.
Oscilloscope Operation Window
Figure 4: Oscilloscope Operation Window
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1. Battery power level indicator symbols, including , , and .
2. Auto measurement window No. 1 where “f” is frequency, “T” is cycle, “V” is the average value, “Vp” the peak-peak value and “Vk” the root-mean-square value.
3. Auto measurement window No. 2.
4. The pointer indicates the horizontal triggering position.
5. This reading gives the time difference between the horizontal triggering position and the screen centerline. It reads zero when the pointer is in the center of the screen.
6. The trigger state indicates the following information:
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 collecting the information
generated after the trigger.
Ready: All pre-triggered data have been captured and the oscilloscope is ready to
receive trigger signals.
Scan: The oscilloscope can gather/display the waveform data continuously in scan
mode.
Stop: The oscilloscope has stopped collecting the waveform data.
7. The green pointer shows the trigger voltage level.
8. A hidden-style menu: With the MENU key pressed, the user can view or hide the
menu.
9. Menu setting options: Various setting options for available menus.
10. The value of the trigger voltage level.
11. The display shows the trigger signal source.
12. The reading gives the value of the primary time base.
13. These graphics present the coupling modes of channel 2 (CH2). The graphic “～” indicates AC, the graphic “－” indicates DC.
14. This reading shows the vertical Voltage Unit Scale of CH2.
15. These graphics show the coupling mode of CH1, the graphic “～” expresses and indicates AC, the graphic “－” indicates DC.
16. This reading shows the vertical Voltage Unit Scale of CH1.
17. The blue pointer gives the grounding data point for the waveform on CH2, which is the zero position of CH2. If this pointer does not display then the channel has not been opened.
18. OSC OPTION operation prompt: There are various prompts for the available OSC OPTION operations.
19. The red pointer gives the grounding data point for the waveform on CH1, which is the zero position of CH1. No display of this pointer indicates that the channel has not been opened.
20. Waveform display area. Red waveform represents CH1, blue waveform represents CH2.
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Navigating a Menu
The following example shows how to use the tool’s menus to select a function, as shown in figure 5:
1. Press the MENU key to display the Function Menu on the right of the screen and the corresponding optional settings on the bottom. Press MENU again to hide the
Function Menu.
2. Press the MENU UP or MENU DOWN key to select various function menus.
3. Choose a key from F1 to F5 to change the function setting.
Figure 5: the Tool’s Menus
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Manually Setting the Vertical System, Horizontal System and Trigger Position
Using the four keys OSC LEFT, OSC RIGHT, OSC UP and OSC DOWN, the user can make the following settings by pressing OSC OPTION. The settings include: Voltage Unit Scale for Channel 1 (CH1 VOL), Voltage Unit Scale for Channel 2 (CH2 VOL), Primary Time base (TIME BASE), zero point position for Channel 1 (CH1 ZERO), zero point position of channel 2 (CH2 ZERO), trigger horizontal position (TIME) and trigger level position (TRIG).
The following example shows how to use the OSC OPTION key:
1. Press the OSC OPTION key once; the following is displayed at the bottom left side of
the screen, as shown in figure 6:
LEFT/RIGHT – Time Base UP/DOWN – CH1 Volts/Div
Figure 6: Voltage Unit Scale of Channel 1
2. Press the key OSC UP or OSC DOWN to adjust the vertical scale of Channel 1 and press OSC LIFT or OSC RIGHT to adjust the horizontal time scale.
3. Press OSC OPTION once again, the following display is visible at bottom left side of
the screen as shown in figure 7:
LEFT/RIGHT – Time Base UP/DOWN – CH2 Volts/Div
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Figure 7: Voltage Unit Scale of Channel 2
4. Press the OSC UP or OSC DOWN key to adjust the vertical scale of Channel 2 and press the OSC LIFT or OSC RIGHT key to adjust the horizontal time scale.
5. Press the OSC OPTION key one more time, and the following display is visible at the
bottom left side of the screen, shown in figure 8.
LEFT/RIGHT – Time UP/DOWN – CH1 Zero
Figure 8: Zero Point Position of Channel 1
6. Press OSC UP or OS C DOWN key to adjust the zero position of Channel 1 in the vertical direction and press OSC LIFT or OSC RIGHT key to adjust the horizontal
position.
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7. Again, press O SC OPTION key and the following appears at the bottom left side of
the screen, shown as the following figure 9:
LEFT/RIGHT – Time UP/DOWN – CH2 Zero
Figure 9: Zero Point Position of Channel 2
8. Press the OSC UP or OSC DOWN key to adjust the zero position of Channel 2 in the vertical direction and press OSC LEFT or OSC RIGHT key to adjust the horizontal
position.
9. Press OSC OPTION key once more and the following appears at the bottom left of
the screen, shown as the following figure 10:
LEFT/RIGHT – Time UP/DOWN – Trig
Figure 10: Trigger Level Position
10. Press the OSC UP or OSC DOWN key to adjust the trigger position of Channel 2 and press OSC LIFT or OSC RIGHT key to adjust the horizontal position.
11. Press the OSC OPTION key again and return back to step 1.
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