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MS420
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Extech MS420 Operating Manual

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User Manual
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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
9
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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Term Glossary
Vertical scale factor is the voltage amplitude represented by a division in the vertical
direction of the display area. The user can amplify or attenuate the signal with this scale factor and thus regulate the signal amplitude for the expected range.
Vertical zero position is referred to as the grounding data point through the
adjustment of which one can regulate the display position of the waveform on the screen.
Primary time base refers to the time values represented by a division in the
horizontal direction of the display area.
Trigger horizontal position is the time deviation between the actual trigger point
and the screen central line which will be displayed as 0 at the center point of the screen.
Trigger level position represents the voltage deviation between the actual trigger
level and the zero position of the triggering signal source channel.
Resetting the Oscilloscope
To reset the Oscilloscope to the factory default settings:
1. Press the MENU key. The function menu appears on the right side of the screen
2. Press the MENU UP or MENU DOWN key to select FUNCTION. Three options
will be visible at the bottom of the screen.
3. Press F1 to select Factory Settings. The oscilloscope will revert to the factory
settings.
Figure 11: Reset the Oscilloscope
Input Connections
Examine the bottom and the right side of the Oscilloscope. The Oscilloscope has seven signal inputs: two safety BNC jack inputs (CH1 and CH2) for scope measurements, three safety 4-mm banana jack inputs for Multimeter R, V and A measurements, and two square jack inputs for Multimeter capacitance measurements.
Isolated inputs allow independent floating measurements between Multimeter and Scope.
(fig. 2)
17
Displaying an Unknown Signal with Auto Set
The Auto-Set feature allows the Oscilloscope to display and measure unknown signals automatically. This function optimizes the position, range, time-base, and triggering and assures a stable display of virtually any waveform. This feature is especially useful for quickly checking multiple signals.
To enable the Auto-Set feature:
1. Connect the test probe to the signals under test.
2. Press the AUTOSET key. The Oscilloscope is now in the automatic measurement
mode. The tested signals appear on the screen.
Automatic Zero-Returning of Trigger Horizontal Position and Trigger Level Position
When the trigger horizontal position and trigger level position are adjusted to maximum, they will become positioned off-screen. The following steps will allow the trigger horizontal position and trigger level position to return to zero automatically:
1. Press the OSC LEFT key and the OSC RIGHT key simultaneously, the trigger horizontal position automatically returns to zero.
2. Press the OSC UP and the OSC DOWN buttons simultaneously, the trigger level position automatically returns to zero.
Automatic Measurements
The Oscilloscope offers 5 ranges of automatic scope measurements. Two numeric
readings can be displayed: measurement 1 and measurement 2. These readings are
selectable independently and the measurements can be performed on the input CH1 or input CH2 waveform.
To choose a frequency for CHI1:
1. Press the MENU key. The function menu appears on the right side of the screen.
2. Press the MENU UP or the MENU DO WN key to select MEAS SET1. Five selectable
items are visible at the bottom of the screen.
3. Press the F1 key and select Freq CH1 from the mean square root value item. The measuremen t 1 window turns red in color and shows the frequency for input CH1.
To choose a Peak-Peak measurement for Input CH2:
1. Press the MENU key. The function menu is displayed on the right side of the screen.
2. Press the MENU UP or the MENU DO WN key and select MEAS SET2, with 5
selectable items displayed at the bottom of the screen.
3. Press the F4 key to select PK-PK CH2 from Peak-Peak item. The measurement 2
window turns blue in color and shows the peak-peak value for input CH2.
Figure 12: Automatic Scope Measurements
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Freezing the Screen
1. Press the RUN/STOP key to freeze the screen. STOP appears at top right side of the
screen.
2. Press the RUN/STOP key once more to resume measurement.
Figure 13: Freezing the Screen
Using Average for Smoothing Waveforms
To smooth the Waveform:
1. Press the MENU key and the function menu will appear on the right side of the
screen.
2. Press the MENU UP or the MENU DO WN key to select ACQU mode, with four
selectable items displayed at the bottom of the screen.
3. Press the F3 key to select Average Factors, then, press F4 to jump to Averages. This
averages the outcomes of 4, 16, 64, or 128 acquisitions and shows the final averaging result on the screen, shown as in the following figures.
Figure 14: Average Factor Sampling Mode
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Using Persistence to Display Waveforms
You can use Persistence to observe dynamic signals:
1. Press the MENU key and the function menu will appear on the right side of the
screen.
2. Press the MENU UP or the MENU DO WN key to select DISP SET. Four selectable
items are displayed at the bottom of the screen.
3. Press the F2 key to select Persist 1 sec, 2 sec, and 5 sec, Infinite or OFF. In this
case, jump to Infinite and the observed dynamic is kept on the screen continuously. When the item OFF is selected, the Persistence function is switched off.
Figure 15: Using ‘Persistence’ to Observe Dynamic Signals
Using Peak Detection to Display Glitches
The user can use this function to display events (glitches or other asynchronous waveforms) of 50 ns or wider:
1. Press the MENU key and the function menu will appear at the right side of the
screen.
2. Press the MENU UP or the MENU DOWN key to select the ACQU MODE. Four
selectable items are displayed at the bottom of the screen.
3. Press the F2 key and jump to Peak Detect.
Figure 16: Peak Detection
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Term Glossary
Collecting mode: The oscilloscope transforms the collected analog data into a digital
form after it is gathered in the following three modes: sampling, peak value detection and averaging values.
Sampling: The oscilloscope takes samples from the signal at equal time intervals to
reconstruct the waveform. In this mode, the analog signal can be expressed correctly in most cases. However, rapid changes cannot be detected between two sampling time intervals.
Peak value detection: The oscilloscope takes samples from the maximum and
minimum of signals in each sampling interval and shows the Waveform with the sampled data. Thus, the oscilloscope may capture narrow pulses that could not be detected in sampling mode.
Averaging values: The oscilloscope collects several Waveforms, averages them,
and displays the averaged Waveform. In this mode random noise can be reduced.
Duration time: When a new Waveform is displayed, the previous Waveform shown
on the screen does not disappear immediately but will continue to be displayed for a period of time. This period of time is referred to as the duration time. Thus, a display similar to that shown by an analog oscilloscope can be achieved.
Roll scan mode: The oscilloscope updates the Waveform sampling points by
scrolling through the screen from left to right (only applicable to the primary time base setting above 50ms).
Selecting AC-Coupling
After a reset, the Oscilloscope is dc-coupled so that ac and dc voltages appear on the screen. Use ac-coupling to observe small ac signals that ride on a dc signal. To select ac-coupling:
1. Press the MENU key and the function menu will appear at the right side of the
screen.
2. Press the MENU UP or the MENU DO WN key to select the CH1 SETUP. Four
selectable items are visible at the bottom of the screen.
3. Press the F1 key and jump to AC. The bottom left side of the screen displays the ac-
coupling icon.
The user can view a screen that looks similar to the following Figure 17.
Figure 17: AC-Coupling
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Reversing the Polarity of the Displayed Waveform
To invert the input CH1 waveform, do the following:
1. Press the MENU key and the function menu will appear at the right side of the
screen.
2. Press the MENU UP or MENU DOWN key to select CH1 SETUP. Four selectable
items are displayed at the bottom of the screen.
3. Press the F4 key to jump to Inverted. The inverted waveform of CH1 is displayed on
the screen.
Figure 18: Inverted
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Using Waveform Mathematical Functions
When adding (CH1 + CH2), subtracting (CH1 – CH2, CH2 – CH1), multiplying (CH1 * CH2) or dividing（CH1 / CH2 ) the input Waveforms of CHI 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 Waveforms for CH1 and CH2. To use a Mathematical function:
1. Press the MENU key and the function menu will display at the right side of the
screen.
2. Press the MENU UP or MENU DOWN key to select the WAVE MATH. Five
selectable items appear at the bottom of the screen.
3. Press F3 to select CH1+CH2 and the calculated waveform M (green) appears on the screen. Press the F3 key to close the Waveform Calculation.
4. Press the OSC OPTION key and the following will be visible at the bottom left side of
the screen. LEFT/RIGHT Time UP/DOWN CHM Zero
Then press the OSC UP or the OSC DOWN key to adjust the vertical position of the
calculated waveform M displayed on the screen.
5. Press the OSC OPTION key and the following will appear at the bottom left side of
the screen. LEFT/RIGHT Time Base UP/DOWN CHM Vol
Press the OSC UP or OSC DOWN key to adjust the displayed amplitude of the
calculated waveform M.
Figure 19: Waveform Mathematics
23
Using the Multimeter
About this Chapter
This chapter provides step-by-step introductions for the multi-meter functions. The introduction gives basic examples on how to use the menus and perform basic operations.
Meter Connections
Use the three 4-mm safety banana jack inputs for the Meter functions: COM, V/Ω, mA. Two square capacitance jacks: CX See Figure 2 for the proper connections.
Multimeter Operation Window
Figure 20: Multimeter Operation Window
Description:
1. Battery power level indictor.
2. Manual/Auto range indictors: Manual refers to the measuring range in manual operation mode and Auto refers to the measuring range in automatic operation mode.
3. Measurement mode indicators:
DCV: Direct voltage measurement ACV: Alternating voltage measurement DCA: Direct current measurement ACA: Alternating current measurement R: Resistance measurement
: Diode measurement
: Audible Continuity measurement
C: Capacitance measurement
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4. The relative magnitude measurement indicator
5. Running state indicators, among which RUN expresses continuous update and STOP represents the screen lock
6. The reference value of the relative magnitude measurement
7. The multiplying power of the dial indication. Multiplying the reading of the dial pointer by the power will yield the measurement result
8. The measurement reading
9. Automatic control measuring range
10. Absolute / Relative magnitude measuring control: The sign “||” expresses the absolute magnitude measuring control and “” represents the relative magnitude measuring control
11. Manual measurement range control
12. Test lead indicates the scale of a reading; different test modes use various colors
25
Multimeter Measurements
By pressing the DMM/OSC key the oscilloscope will switch to the Multimeter mode.
The screen will display the multimeter windows, and, at the same time, prompt to correctly insert the test leads. At this time press any key to enter the multimeter
measurement mode.
Measuring Resistance Values
To measure a resistance, do the following:
1. Press the R key and R appears at the top
of the screen.
2. Insert the black lead into the COM banana
jack input and the red lead into the V/Ω banana jack input.
3. Connect the red and black test leads to the
resistor. The resistor value is displayed on the screen in Ohms.
Figure 21: Resistance Measurement
Making a Diode Measurement
To make a diode measurement:
1. Press the R key and R appears at the top
of the screen.
2. Press the AUTO SET key until the
following is displayed
.
3. Insert the black lead into the COM banana
jack input and the red lead into the V/Ω banana jack input.
4. Connect the red and black leads to the
diode and the reading is displayed on the
screen in V.
Figure 22: Diode measurement.
Making Continuity Tests
To perform a Continuity Test, do the following:
Press the R key and R appears on the top of
1.
the screen.
2. Press the AUTO SET key until the following is
shown on the screen.
3. Insert the black lead into the COM banana
jack input and the red lead into the V/Ω banana jack input.
4. Connect the red and black test leads to the
test points. If the resistance value of the tested point is less than 50Ω an audible beep will sound.
Figure 23: Continuity.
26
Making a Capacitan ce Measurement
To measure a capacitance:
1. Press the R key and R appears on the top of
the screen
2. Press the AUTO SET key till C appears at the
top of the screen.
3. Insert the capacitor into the square jack and the
screen will show the capacitance reading.
Note: When the measured value is less than 5nF,
use the low capacitance mode of the multimeter and the relative value measuring mode to improve measurement precision. If the capacitance measurement is larger than 40uF the calculation will take about thirty seconds.
Making a DC Voltage Measurement
To measure a DC voltage, do the following:
1.
Press the V key and DCV appears at the top of
the screen.
2. Insert the black lead into the COM banana jack
input and the red lead into the V/Ω banana jack input.
3. Connect the red and black test leads to the
measurement points and the measured voltage value will display on the screen.
Making a AC Voltage Measurement
To measure AC voltage:
1. Press the V key and DCV appears at the top
of the screen.
2. Press the AUTO SET key and ACV appears at
the top of the screen.
3. Insert the black lead into the COM banana
jack input and the red lead into the V/Ω banana jack input.
4. Connect the red and black test leads to the
measurement points and the AC voltage value will be displayed on the screen.
Figure 24: Capacitance Measurement
Figure 25: DC Voltage Measurement
Figure 26: AC Voltage Measurement.
27
Making a DC Current Measurement
To measure DC current less than 400 mA:
1. Press the A key and DCA appears at the top
of the screen. The units on the main reading
screen are mA and 20A, press F4 or F5 to switch the measurement between mA and 20A.
2. Insert the black lead into the COM banana
jack input and the red lead into the mA banana jack input.
3. Connect the red and black test leads in
series to the measurement points and the DC current value will be displayed on the screen.
To measure DC current larger than 400mA:
1. Press the A key and DCA appears at the
top of the screen. The units on the main reading screen will be mA.
2. Press F5 to change to the 20A
measurement mode, the units on the main
reading screen will be A.
3. Plug the 20A current shunt into the current
measure jack, and then plug the probe in the module.
4. Connect the red and black test leads in
series to the measurement points and the DC current value will be displayed on the screen.
5. Press F4 to return to the 400mA
measurement mode.
Making an AC Current Measurement
To measure AC current less than 400mA:
1. Press the A key and DCA appears at the top
of the screen. The units on the main reading
screen are mA and 20A, press F4 or F5 to switch the measurement between mA and 20A.
2. Press the AUTO SET key once and ACA will
be visible at the top of the screen.
3. Insert the black lead into the COM banana
jack input and the red lead into the mA banana jack input.
4. Connect the red and black test leads to the
measurement point and the AC current value will be displayed on the screen.
Figure 27: DC Current Measurement.
Figure 28: DC Current Measurement.
Figure 29: AC Current Measurement
28
To measure AC current larger than 400mA:
1. Press the AUTO SET key once and ACA
will be visible at the top of the screen.
2. Press F5 to select 20A, the units for the main reading window will be A.
3. Press the AUTO SET key once and ACA
will be visible at the top of the screen.
4. Plug the current extended module into the current measurement jack, and plug the test leads into the shunt.
5. Connect the red and black test leads in series to the measurement points and the AC current value will be displayed on the screen.
6. Press F4 to return to the 400mA
measurement mode.
Figure 30: AC Current Measurement for 20A
Freezing a Displayed Reading
Freeze 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
measurements.
Figure 31: Freezing the Readings
Taking a Relative Measurement
A reading, relative to a reference value, is displayed in the relative measurement mode. The following example shows how to take a relative measurement. First, the user must define a reference value:
1. Press the R key and R will be displayed on the
top of the screen.
2. Press the AUTO SET key untill C appears at
the top of the screen.
3. Plug the capacitance extended module into the
capacitance measurement jack.
4. When the reading stabilizes, press F2 and the
triangle icon will be displayed on the top of the screen. The saved reference value is displayed below the triangle
5. All subsequent readings will be displayed relative to the stored reference reading.
Figure 32: Relative Measurement.
29
Selecting Automatic/Manual Range
The default range mode is the automatic range mode. To switch to the manual range, perform the following steps:
1. Press the F1 key and MANUAL is displayed
on the top left side of the screen.
2. In manual range mode, the measuring range is
increased each time F1 is pressed. After the
highest range is reached, the meter will return to the lowest range. To return to automatic
mode, Press the F3 key and AUTO is
displayed on the top left side of the screen.
Figure 33: Automatic/Manual Range Adjustment
30
Advanced Oscilloscope Functions
About this Chapter
This chapter details the advanced oscilloscope functions.
Setting the Vertical CH1 and CH2
Each channel can be set independently. To change vertical CH1 and CH2 settings:
1. Press the MENU key and the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to jump to CH1 SETUP and four options
appear at the bottom of the screen.
3. Press any key from the F1 key through F4 to adjust the available settings.
The user can view a screen that looks similar to the following Figure 34.
Figure 34: Setting the Vertical
The following Table describes the Vertical Channel menu:
Function
menu
Coupling
Channel
Probe
Invert
Setting
AC DC
Close Open
1X
10X
100X
1000X
Close Open
Description
The dc component in the input signal is blocked. The ac and dc components of the input signal are allowed Close a channel Open a channel Select one setting according to the probe attenuation factor to ensure a correct vertical scale reading.
Waveform is displayed normally.
Open the Invert function of the Waveform setting.
31
Setting the Channel Coupling
Example (CH1): Sine wave signal containing a dc offset.
Press F1 Coupling first and then press AC for an ac coupling setting. The dc component
contained in the tested signal is blocked.
Press F1 Coupling first and then press DC for a dc coupling setting. Both dc and ac
components contained in the tested signal are permitted.
The waveform is displayed as in Figures 35 and 36.
Figure 35: AC Coupling
Figure 36: DC Coupling
32
Enabling the Scope Channels
Example for CH1: Set the F2 Channel key to OFF and CH1 will be turned off. Set the F2 Channel key to ON and CH1 will be displayed.
Adjusting the Probe Scale
If a 10:1 probe is connected, the scale of the input channel on the oscilloscope should be
set to 10X to avoid any error occurring in the displayed scale factor information and tested
data.
Press F3 Probe to set the correct probe attenuation.
Table: Probe attenuation factors and the corresponding menu setting.
Probe Attenuation
Corresponding Menu Setting
Factor
1:1 1X
10:1 10X
100:1 100X
1000:1 1000X
Inverting a Waveform
The displayed signal reverses 180 degrees relative to ground.
Press F4 Invert to invert the waveform. Press F4 Invert once again to cancel the
Inversion.
Math Function Menu Settings
The MATH function provides the results for addition, subtraction, multiplication or division
calculations on CH1 and CH2 channel waveforms. The result can be shown in grid or cursor modes. The amplitude of the calculated waveform can be adjusted with CHM VOL, which is displayed in the scale factor form. The amplitude ranges are 0.001X, 0.002X,
0.005X and 10X. The position of the calculated waveform can be adjusted up and down
with the CHM Zero key.
Math Function Table
Setting Description
CH1-CH2 CH1 waveform minus CH2 waveform.
CH2-CH1 CH1 waveform minus CH2 waveform
CH1+CH2 Add CH1 waveform to CH2 waveform
CH1*CH2 Multiply CH1 waveform and CH2 waveform
CH1/CH2 Divide CH1 waveform by CH2 waveform
33
To perform a CH1+CH2 waveform calculation:
1. Press the MENU key and the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select WAVE MATH. Five options are
displayed at the bottom of the screen.
3. Press the F3 CH1+CH2 key and the obtained waveform M appears on the screen.
Press the F3 key again to close the waveform M.
4. Press the OSC OPTION key and the following will be displayed on the screen:
LEFT/RIGHT – Time Base UP/DOWN – CH1 Volts/Div
5. Press the OSC UP or OSC DOWN key to adjust the amplitude of the waveform M.
6. Press the OSC OPTION key twice and the following will appear:
LEFT/RIGHT – Time UP/DOWN – CHM Zero
7. Press the OSC UP or OSC DOWN key to adjust the position of waveform M.
Figure 37: Waveform Mathematics
Setting the Trigger
The trigger defines the start time for data acquisition and waveform display. When beginning to acquire data, the oscilloscope collects sufficient data to draw the waveform at the left side of the triggering point. After a trigger is detected, the oscilloscope gathers enough data to draw the waveform at the right side of the triggering point.
To configure a trigger mode setting:
1. Press the MENU key and the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select TRIG MODE and five selectable
items will be displayed at the bottom of the screen.
3. Use the F1 through F5 keys to make selections.
4. Press the OSC OPTION key and the following will be shown on the screen:
LEFT/RIGHT – Time UP/DOWN – Trig
5. Press the OSC UP or OSC DOWN key to adjust the trigger level positions.
34
Figure 38: Edge Trigger
Triggering Control
There are two triggering modes: Edge and Video. Each trigger mode is set by menu functions:
Edge triggering occurs when the trigger input passes through a given level in the
specified direction.
Video triggering: Perform video field trigger or line trigger on standard video signals.
The following describes the Edge and Video triggering menus respectively.
Edge Triggering
With Edge triggering selected, the trigger occurs on the rising or falling edge of the
input signal, if the triggering threshold is met.
The Edge triggering menu:
Function menu
Slope Rise
Signal source Trigger mode
Coupling AC
Settings Description
Triggering on the rising edge of the signal. Fall CH1 CH2 Auto
Normal
Single Shot
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
when the triggering condition is satisfied.
The sampling is performed on a waveform when one
trigger is detected, then sampling ceases.
With this mode selected, the DC component is
DC
HF suppression
LF suppression
prevented from passing-through.
All dc components are allowed to pass.
The HF part of the signal is prohibited and only the LF
component is allowed.
The LF part of the signal is prohibited and only the HF
component is allowed to pass
35
Video Triggering
With Video triggering selected, the oscilloscope performs NTSC, PAL or SECAM
standard video signal field and line triggering.
The user can view a screen that looks similar to the following Figures 39 & 40.
Figure 39: Video Field Trigger
Figure 40: Video Line trigger
The Video triggering menu is described in the following table.
Function
Settings Description
menu
Polarity Normal
Invert
Applicable to the video signal in which the black level is low level. Applicable to the video signal of which the black level is high level.
Signal source CH1
CH2
SYNC Line
Field
Select CH1 as the trigger source. Select CH2 as the trigger source. Make a video line trigger synchronization setting Make a video field trigger synchronization setting.
36
Term Glossary Trigger modes: There are three kinds of trigger modes available for this oscilloscope-
auto, normal and single shot.
Automatic trigger mode: In this mode, the oscilloscope can acquire a Waveform
without any triggering condition detected. It will be triggered automatically after waiting a specified period of time. When an invalid trigger is sensed the oscilloscope cannot keep the Waveform in phase.
Normal trigger mode: In this mode the oscilloscope cannot acquire the Waveform until it
is triggered. If there is no trigger, the oscilloscope will display the original Waveform without new Waveforms being captured and/or displayed.
Single shot mode: In this mode the oscilloscope will detect a trigger and capture a
Waveform each time the operator presses the RUN/STOP key.
Acquiring Mode Settings
The Acquiring Mode menu is described in the table shown below:
Function menu
Sampling Normal sampling mode.
Peak Detection Used to detect a glitch.
Average Value Used to reduce random and unrelated noise.
Average Factor 4, 16, 64
Settings Description
Several average factors are available.
Select the average factor.
or 128
Display Settings
The Display Setting menu is described in the following table:
Function menu
Type Vector
Persistence Close
Display format YT
Communication Bitmap
Settings Description
The vector fills the spaces between neighboring
Dot
1s 2s 5s Infinite
XY
Vector
sampling points to form a line on the display. Only the sample points are displayed.
Set ‘Persistence’ time for each sampling point.
Displays the relative relationship between vertical voltage and horizontal time.
Display CH1 on the horizontal axis and CH2 on the
vertical axis.
The data is transmitted as a bitmap The data is transmitted as a vector
37
Display Style
The display styles include Vector and Dot as shown in Figures 41 & 42.
Figure 41: Dot Style
Figure 42: Vector Style
Persistence Mode
With the Persistence function selected, the displayed data gradually decays in color
and the new data is shown bright in color. In the infinite persistence mode, the recorded points will be kept on the screen until the controlled value is changed.
38
XY Mode
With the XY mode selected, CH1 is displayed on the horizontal axis and CH2 displayed on the vertical axis. When the oscilloscope is in a sampling mode in which no trigger is found, the data appear as light spots.
Operation of various control keys:
■ CH1 Volts and CH1 Zero for CH1 are used to set the horizontal scale and
position.
■ CH2 Volts and CH2 Zer o for CH2 are used to set the vertical scale and position.
The following functions do not work in the XY display mode:
■ Reference or digital value waveform
■ Cursor
■ Auto Setting
■ Time base control
■ Trigger control
Waveform Saving Setup
The oscilloscope can save four (4) Waveforms all of which can be displayed on the screen with the present Waveform. The recalled Waveform saved in the memory cannot be adjusted.
The waveform saving /recalling menu is described in the following list.
Function
Setups Description
menu
Signal source
CH1 CH2
Select the displayed Waveform to save.
MATH
Address A, B, C and D Select the address for saving or recalling a
Waveform.
Saving Store the Waveform of a selected signal source into
the selected address.
Addresses A, B, C
Close Start
Close or start displaying the Waveforms stored in address A, B, C or D.
and D
To save a waveform on CH1 in address A:
1. Press the MENU key; the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select Wave Save. Four selectable
items are displayed at the bottom of the screen.
3. Press the F1 key to select the signal source CH1.
4. Press the F2 key to select the Address A.
5. Press the F3 key to save the CH1 Waveform in Address A.
To display the saved Waveform:
Press the F4 key to select Start for address A. The Waveform saved in address A will
be displayed on the screen in green and the zero point of Waveform k, voltage and time, will be purple
39
The user can view a screen that looks similar to the following Figure 43.
Figure 43: Saving a Waveform
Function Setting Menu
The Function Setting Menu is described in the following list:
Function Menu
Factory setting Return the instrument to its factory settings.
Self-correcting Perform a self-correcting procedure.
Language Chinese
Self-correcting:
The self-correcting program can improve the accuracy of the oscilloscope if the ambient temperature variation is equal to or larger than 5 degrees Celsius.
Before the self-correcting program is performed, the probe or leads should be
disconnected; Press F2 “Self-correcting” to enter the self-correcting program.
Setting Description
Select the display language
English
Automatic Measurements
The oscilloscope can perform five (5) types of automatic measurements: Frequency, Cycle, Average value, Peak-to-peak value and Root mean square. Two types of measurements can be displayed on the screen simultaneously.
The function menu for automatic measurements is described in the following table:
Function menu
Frequency CH1
Cycle CH1
Average value CH1
Peak-to-Peak value RMS value CH1
Settings Description
Measures the frequency of CH1
CH2
CH2
CH2 CH1 CH2
CH2
Measures the frequency of CH2 Measures the cycle of CH1 Measures the cycle of CH1 Measures the average value of CH1 Measures the average value of CH2 Measures the peak-to-peak value of CH1 Measures the peak-to-peak value of CH2 Measures root mean square (RMS) value of CH1 Measures root mean square (RMS) value of CH2
40
To measure the frequency of CH1 with Measurement 1 and the frequency of CH2 with Measurement 2, perform the following:
1. Press the MENU key; the function menu will be shown at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select MEAS SET1. Five options
appear at the bottom of the screen.
3. Press the F1 key to select the frequency measurement as CH1. The
measurement window 1 on the screen turns red in color and shows the frequency of CH1.
4. Press the MENU UP or MENU DOWN key to select MEAS SET2 . Five options
appear at the bottom of the screen.
5. Press the F4 key to jump to the peak-to-peak measurement symbolized as CH2.
The measurement window on the screen turns blue in color and shows the peak­to-peak value of CH2.
The user can view a screen that looks similar to the following Figure 44.
Figure 44: Automatic Measurements
Cursor Measurements
This oscilloscope allows the user to make manual cursor measurements of time and voltage. The signal sources include Channel 1 (CH1), Channel 2 (CH2), MATH, storage Address A and storage Address B.
The cursor measurement menus are listed and described in the following table:
Function
Settings Description menus Type Close
Voltage
Time Signal sources
CH1, CH2, ATH,
address A and
Closes the cursor measurement Displays the voltage cursor and menu Displays the time cursor and menu Selects the Waveform channel on which the cursor measurement will be performed
address B.
41
To make a voltage measurement on CH1, perform the following:
1. Press the MENU key: the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select CURS MEAS. Two options
are shown at the bottom of the screen.
3. Press the F1 key to select the measurement type Voltage. Two purple crossing
dashed lines V1 and V2 are shown on the screen.
4. Press the F2 key to select the measured channel CH1.
5. Press and hold the OSC OPTION key till the UP/DOWN CURSOR 1 is visible on the screen. At this time, adjust OSC UP or OSC DOWN and the dashed line V1 is shown moving up and down while the measured voltage value of V1 relative to
the zero position of CH1 appears on the screen.
6. Press and hold the OSC OPTION key until the UP/DOWN CURSOR 2 appears on the screen. Now, adjust OSC UP or OSC DOWN and the dashed line V2 will appear moving up and down while the measured voltage value of V2 relative to
the zero position of CH1 is displayed on the screen. Also, the absolute values of
V1 and V2 can be shown on the screen.
The user can view a screen that looks similar to the following Figure 45.
Figure 45: Use the Cursor for a Voltage Measurement
To use the cursor for a time measurement on CH1, perform the following:
1. Press the MENU key; the function menu will appear at the right of the screen.
2. Press the MENU UP or MENU DOWN key to select Cursor Measurement. Two
key labels are shown at the bottom of the screen.
3. Press the F1 key for measurement type Time. Two vertical dashed lines T1 and
T2 appear on the screen.
4. Press the F2 key to jump to the measured channel CH1.
5. Press and hold the OSC OPTION key until the UP/DOWN CURSOR 1 appears on the screen. Then adjust OSC UP or OSC DOWN to observe the dashed line moving left and right. At the same time, the time value of T1 relative to the screen middle point position will be displayed on the screen.
6. Keep pressing the OSC OPTION key until UP/DOWN CURSOR 2 is displayed on the screen. Then adjust OSC UP or OSC DOWN so that the dashed line T2 is moving right and left while the time value of T1, relative to the screen middle point position, appears on the screen. Observe the absolute time values and frequencies for T1 and T2.
42
The user can view a screen that looks similar to the following Figure 46.
Figure 46: Use the Cursor for Time Measurement
System State Menu
The system state menu is used to display information about the present horizontal system, vertical system, trigger system and others. The operational steps are listed below:
1. Press the MENU key; the function menu will appear at the right side of the
screen.
2. Press the MENU UP or MENU DOWN key to select SYS STAT. Four options
appear at the bottom of the screen.
3. Sequentially press F1 through F4 and the corresponding status information will
display.
The following Figure 47 will be displayed.
Figure 47: System State
43
Setting the Time Base Mode
The time base mode menu is detailed in the following table:
Function menu Explanation
Main time base Horizontal main time base is used for waveform
display
Window setting Use two cursors to define a window area
Window extension Expand the defined window to full-screen display
For a Window Extension, use the following steps:
1. Press the MENU key; the function menu will appear on the right side of the
screen.
2. Press the MENU UP or MENU DOWN key to select TIME MODE (three options
appear at the bottom of the display).
3. Press the F2 key to select the window setting.
4. Press the OSC OPTION key to view TIME BASE, then use the OSC LEFT and OSC RIGHT keys to adjust the time base window area defined by two cursors,
the window size will vary.
5. Press the OSC OPTION key to view the TIME, use the OSC LEFT and OSC RIGHT keys to adjust the window position defined by two cursors, the window
position is the time difference of the window center to the main time base’s horizontal pointer.
6. Press F3, select window extension, the defined window extends to a full-screen
display.
Figure 48: Window Setting
44
Figure 49: Window Extension
Data Transmission
1. Press the MENU key to display the function menu on the right side of the screen.
2. Press the MENU UP or the MENU DOWN key to select the DISP SET mode; four
options appear at the bottom of the display.
3. Press the F4 key and select Bitmap or Vectors for data transmission.
4. Use the supplied cable to connect the meter to the PC.
5. Open the supplied software program on the PC.
6. Set the parameters according to the Software User Guide or from the Help Utility available inside the software program to start data transmission.
45
Troubleshooting
1. The oscilloscope will not Power ON
The battery may need recharging. The oscilloscope will not start even if it is powered by the battery charger. First, charge the battery completely and then supply the oscilloscope with power through the battery charger. However, do not switch on the oscilloscope’s power for fifteen minutes. If the oscilloscope still will not start, please contact Extech Instruments.
2. The oscilloscope shuts OFF after operating for only several seconds
The battery may need recharging. Check the battery symbol at the upper right of the screen. The
charged.
3. The measurement displays ERR when in the multimeter mode
Make sure the instrument is switched to the measuring mode. Depress any of the three keys V, A or R. The relative measuring mode will then be shown on the screen. If ERR is still displayed, restart the meter.
4. The measured voltage amplitude value is 10 times larger or smaller while in the oscilloscope mode
Check whether the channel attenuation factor matches the actual probe ratio.
5. In the Oscilloscope mode, the Waveform is displayed but is not stable
symbol indicates that the battery has run out of power and must be
Check whether the setting in the trigger mode menu matches the signal channel
indicated.
Check the trigger mode: The edge trigger mode is applicable to normal
waveforms and the video trigger mode is applicable to video signals. Only when the proper trigger mode is applied can the Waveform stabilize.
Change the trigger coupling to HF repression and LF repression in order to filter
the HF or LF noise.
6. There is no display on the screen when the RUN/STOP key is pressed while in the oscilloscope mode
Check whether the trigger mode in the trigger mode menu is in the Normal or the Single-Shot mode and whether the trigger level is out of the Waveform range. In such a condition, adjust the middle trigger level or select the non-auto trigger mode. Additionally, press the AUTO SET key.
7. The display speed is unusually slow when attempting to select the average sampling in the sampling mode or while selecting a longer display time in the display mode for the oscilloscope
This is normal.
46
Appendix
Appendix A: Specifications
Oscilloscope
All technical specifications are applicable with the probe set to the 10X attenuation switch setting (unless otherwise noted). In order for the instrument to maintain these specifications the oscilloscope should meet the following requirements:
■ The instrument should operate continuously for more than 30 minutes under specified operating environmental temperatures.
■ If the variation in ambient temperature is equal to or greater than 5 degrees Celsius, open the system function menu and perform a “self- calibration”
Sampling:
Sampling modes Normal sampling
Peak detection Average value
Sampling rate 100 MS/s
Input:
Input coupling DC, AC
Input impedance 1MΩ ±2% connected in parallel with 20pF ±3pF
Probe attenuation coefficient 1X, 10X, 100X, 1000X
Max. Input voltage 400V (peak)
Channel delay time (typical) 150ps
Horizontal:
Sampling rate range 10S/s 100MS/s
Waveform interpolation (sin x)/x
Record length 6K points on each channel
Scanning speed range (S/div) 5ns/div 5s/div, stepping in the “1-2.5-5” mode
Sampling rate and relay time accuracy
Time interval (T)measurement accuracy（full bandwidth）
±100ppm(any time interval which is equal to or larger than 1ms)
Single: ±(1 sampling interval time+100ppm×reading+0.6ns)
>average 16 : ±(1 sampling interval time +100ppm×reading+0.4ns)
47
Vertical:
Analog digital converter（A/D）
With a resolution of 8 bits, sampling is performed on both channels synchronously.
Sensitivity range （V/div） 5mV/div～5V/div（at the input BNC）
Displacement range ±50V(500mV~5V),±1V(5mV~200mV)
Analog bandwidth 20M
Single bandwidth Full bandwidth
Low frequency response (AD
≥5Hz (at the BNC)
coupling, -3dB)
Rise time (typical one at the
≤17.5ns
BNC)
DC gain accuracy ±5%
DC measurement accuracy (average value sampling mode)
The voltage difference (V) between any two points on the Waveform after averaging the captured waveforms more than16: ±(5% reading + 0.05 divisions).
Trigger:
Trigger sensitivity (Edge triggering)
DC coupling
AC coupling
CH1 and CH2: 1div(DC~full bandwidth)
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 (typical) which is applicable to the signal with rise and fall time equal to or longer than 20ns
Trigger displacement
Make a 50% level setting (Typical).
Trigger sensitivity (Video triggering and typical mode)
Signal system and line/field frequency (Video triggering mode)
Measurement:
Cursor
Voltage difference (V) and time difference (T) between cursors
measurement
Auto measurement
Peak-to-peak value, average value, root mean square value, frequency and cycle.
±0.3 divisions
655 divisions for pre-triggering and 4 divisions for post­triggering
Operation with the input signal frequency equal to or larger than 50Hz.
2 divisions of peak-to-peak value
Supports the NTSC, PAL and SECAM broadcasting systems of any field or line frequency.
48
Probe:
1X position 10X position
Bandwidth Up to 6 MHz (DC) Up to full bandwidth (DC)
Attenuation rate 1: 1 10: 1
Compensation
10pf~35pf
range
Input resistance 1MΩ±2% 10MΩ±2%
Input impendence 85pf~115pf 14.5pf~17.5pf
Input voltage 150 V DC 300 V DC
Meter Voltage (VDC)
Input Impedance: 10MΩ.
Max. Input Voltage: 1000V (DC or AC peak-to-peak value)
Range Accuracy Resolution
400.0mv 100uV
±1%±1 digit
4.000V 1mV
40.00V 10mV
400.0V
100mV
Voltage (VAC)
Input Impedance: 10MΩ.
Max. Input Voltage: 750V (AC, virtual value)
Frequency range: from 40Hz to 400Hz.
Display: Virtual value of the sine wave
Range Accuracy Resolution
4.000V 1mV
±1%±3 digits
40.00V 10mV
400.0V
100mV
Direct Current (DC):
Range Accuracy Resolution
40.00mA ±1%±1 digit 10uA
300.0mA ±1.5%±1 digit 100uA
20A (with adaptor) ±3%±3 digits 10mA
Alternating Current (AC):
Range
Accuracy Resolution
40.00mA ±1.5%±3 digits 10uA
300.0mA ±2%±1 digit 100uA
20A (with adaptor) ±5%±3 digits 10mA
49
Resistance
Range Accuracy Resolution
400.0 Ω ±1%±3 digits 0.1Ω
4.000KΩ 1Ω
±1%±1 digit
40.00KΩ 10Ω
400.0KΩ 100Ω
4.000MΩ
1KΩ
40.00MΩ ±1.5%±1 digit 10KΩ
Capacitance
Range Accuracy Resolution
51.20nF 10pF
±3%±3 digits
512.0nF 100pF
5.120uF 1nF
51.20uF 10nF
100uF
100nF
Diode
Voltage reading: 0 V ～1.5 V.
Continuity Test
A beep will sound when the resistance is less than 30Ω
General Specifications
Mechanical dimension 18 cm×11.5cm×4cm
Weight 645 g
Power consumption <6 W
Display type 3.8" color liquid crystal display
Display resolution 320 (horizontal) ×240 (vertical) pixels
Display color 4096 colors
Power Adapter:
Power supply 100-240 V AC (50/60Hz)
Power output 8.5 VDC
Current output 1500 mA
Ambient Temperature and Relative Humidity:
Temperature (Operational) and Relative Humidity %:
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 %
40 to 50 °C (104 to 122°F) 45 %
Temperature (storage) and Relative Humidity %:
-20 to +60°C (-4 to +140°F) no condensation
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Appendix B: Maintenance and Cleaning
Common Maintenance
Do not store or place the instrument in locations where the liquid crystal display (LCD) may be exposed to direct sunlight for long periods of time.
In order to avoid damaging the instrument or the probe, do not expose to liquids or solvent agents.
Cleaning:
Inspect the instrument and the probe frequently in accordance with the product’s operating manual. Clean the outer surface of the instrument according to the following steps:
1. Wipe off obvious dust on the outside of the instrument and on the probe with a soft, clean cloth. When cleaning the LCD do not scuff the transparent LCD protective screen.
2. Wipe the instrument clean while it is in its power off status. Use a soft cloth that is moistened but not dripping wet. The instrument may be cleaned with mild detergent and fresh water. To prevent damage to the instrument or to the probe do not use abrasive chemicals, strong detergents or cleansers to clean the product.
Warning: Before powering and starting the product, please confirm that the
instrument has completely dried so as to avoid electrical short circuit and personal injury.
Storing the Oscilloscope
If the oscilloscope is to be stored for a long time, the lithium battery must be fully charged before storage.
Charging the Oscilloscope
The lithium battery may not arrive fully charged when it is first received by the customer. To properly charge the battery, it must be charged for 4 hours (the oscilloscope must be turned off during charging). The battery can supply power for 4 hours after being charged completely. When utilizing battery power, a battery charge indicator is displayed on the top of the screen to show the battery’s remaining power level. The symbols that may
appear include minutes. To charge the battery and power the instrument, connect the oscilloscope using a power adapter according to Figure 2 to charge the battery. The charging speed can be increased by turning off the oscilloscope.
Notice: To avoid overheating the battery during charging, the environmental temperature
should not exceed the temperatures listed in the technical Specifications section.
Note: Once the battery is fully charged, the charger will automatically switch itself to a
slower charging rate, thus eliminating the need to turn off the charger at the time the battery is fully charged.
, , and , where shows that the battery can only be used for about 5
Replacing the Lithium Battery Unit
It is usually not required to replace the battery unit. But when it is required to be replaced only qualified personnel should carry out this operation and the battery should be replaced with the same specified lithium battery.
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