multicomp pro MP720009 User manual

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Smart Digital Storage Oscilloscope
Models MP720009, MP720010 and MP720011

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Table of Contents
1. General Safety Requirements.......................................................................................... 1
2. Safety Terms and Symbols............................................................................................... 2
3. Quick Start ....................................................................................................................... 4
Introduction to the Structure of the Oscilloscope..................................................................... 4
Front Panel ............................................................................................................................................. 4
Rear Panel............................................................................................................................................... 5
Control Area ........................................................................................................................................... 6
User Interface Introduction........................................................................................................ 7
How to Implement the General Inspection ............................................................................... 9
How to Implement the Function Inspection.............................................................................. 9
How to Implement the Probe Compensation.......................................................................... 10
How to Set the Probe Attenuation Coefficient........................................................................ 11
How to Use the Probe Safely..................................................................................................... 12
How to Implement Self-calibration.......................................................................................... 12
Introduction to the Vertical System......................................................................................... 12
Introduction to the Horizontal System.................................................................................... 14
Introduction to the Trigger System ......................................................................................... 15
4. Advanced User Guidebook ............................................................................................ 16
How to Set the Vertical System ................................................................................................ 17
Use Mathematical Manipulation Function ............................................................................. 18
The Waveform Calculation .................................................................................................................... 19
Using FFT function ................................................................................................................................ 19
Use Vertical Position and Scale Rotary controls .................................................................... 22
How to Set the Horizontal System ........................................................................................... 23
Zoom the Waveform .............................................................................................................................. 23
How to Set the Trigger System................................................................................................. 24
Single Trigger......................................................................................................................................... 25
Alternate Trigger (Trigger mode: Edge) ................................................................................................ 26
How to Operate the Function Menu ........................................................................................ 27
How to Set the Sampling/Display .......................................................................................................... 27
How to Save and Recall a Waveform..................................................................................................... 29
How to Implement the Auxiliary System Function Setting.................................................................... 36
How to Measure Automatically.............................................................................................................. 38
How to Measure with Cursors................................................................................................................ 41
How to Use Executive Buttons............................................................................................................... 44
5. Communication with PC ............................................................................................... 46
6. Demonstration ............................................................................................................... 48

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Example 1: Measurement a Simple Signal.............................................................................. 48
Example 2: Gain of a Amplifier in a Metering Circuit.......................................................... 49
Example 3: Capturing a Single Signal..................................................................................... 50
Example 4: Analyze the Details of a Signal............................................................................. 51
Example 5: Application of X-Y Function................................................................................ 53
Example 6: Video Signal Trigger............................................................................................. 55
7. Troubleshooting ............................................................................................................. 56
8. Technical Specifications................................................................................................ 57
General Technical Specifications ............................................................................................. 60
9. Appendix ........................................................................................................................ 61
Appendix A: Enclosure ............................................................................................................. 61
Appendix B: General Care and Cleaning ............................................................................... 62

User Manual
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1. General Safety Requirements
Before use, please read the following safety precautions to avoid any possible bodily
injury and to prevent this product or any other connected products from damage. To
avoid any contingent danger, ensure this product is only used within the ranges
specified.
Only a qualified technician can implement the maintenance.
To avoid Fire or Personal Injury:
Use Proper Power Cord. Use only the power cord supplied with the product and
certified to use in your country.
Connect or Disconnect Correctly. When the probe or test lead is connected to a
voltage source, please do not connect and disconnect the probe or test lead.
Product Grounded. This instrument is grounded through the power cord grounding
conductor. To avoid electric shock, the grounding conductor must be grounded. The
product must be grounded properly before any connection with its input or output
terminals.
When the instrument is powered by AC, do not measure AC power sources
directly otherwise it will cause a short circuit. This is because the testing ground
and power cord ground conductor are connected.
Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings and
markings on this product. Refer to the user manual for more information about ratings
before connecting to the instrument.
Do not operate without covers. Do not operate the instrument with covers or panels
removed.
Use the Proper Fuse. Use only the specified type and rating fuse for this instrument.
Avoid exposed circuit. Be careful when working on exposed circuitry to avoid risk of
electric shock or other injury.
Do not operate if any damage. If you suspect damage to the instrument, have it
inspected by qualified service personnel before further use.
Use your Oscilloscope in a well-ventilated area. Make sure the instrument installed
with proper ventilation.
Do not operate in damp conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.

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2. Safety Terms and Symbols
Safety Terms
Terms in this manual (The following terms may appear in this manual):
Warning: Warning indicates conditions or practices that could result in injury or
loss of life.
Caution: Caution indicates the conditions or practices that could result in
damage to this product or other property.
Terms on the product. The following terms may appear on this product:
Danger: Indicates an immediate hazard or injury possibility.
Warning: Indicates a possible hazard or injury.
Caution: Indicates potential damage to the instrument or other property.
Safety Symbols
Symbols on the product. The following symbol may appear on the product:
Hazardous Voltage Refer to Manual
Protective Earth Terminal Chassis Ground
Test Ground

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To avoid body damage and prevent product and connected equipment damage, carefully
read the following safety information before using the test tool. This product can only be
used in the specified applications.
Warning:
The two channels of the oscilloscope are not electrically isolated. The channels should
adopt a common ground during measuring. To prevent short circuits, the 2 probe
grounds must not be connected to 2 different non-isolated DC levels.
The diagram of the oscilloscope ground wire connection:
Ground Clip
Signal Input
Oscilloscope Electrical Outlet
Probe
Power Cord
It is not allowed to measure AC power when the AC powered oscilloscope is
connected to the AC-powered PC through the ports.
Warning:
To avoid fire or electrical s
hock, when the oscilloscope input signal
connected
is more than
42V peak (30Vrms) or on circuits of more than
4800VA
, please take note of below items:
Only use accessory insulated voltage probes and test lead.
Check the accessories such as probe before use and replace it if
there are any damages.
Remove probes, test leads and other accessories immediately after
use.
Remove USB cable which connects oscilloscope and computer.

Do not apply input voltages above the rating of the instrument
because the probe
tip voltage will directly transmit to the
oscilloscope. Use with caution when the probe is set as 1:1.
Do not use exposed metal BNC or banana plug connectors.
Do not insert metal objects into connectors.

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3. Quick Start
Introduction to the Structure of the Oscilloscope
This chapter makes a simple description of the operation and function of the front panel of
the oscilloscope, enabling you to be familiar with the use of the oscilloscope in the
shortest time.
Front Panel
The front panel has rotary controls and function buttons. The 5 buttons in the column on
the right side of the display screen are menu selection buttons, through which, you can set
the different options for the current menu. The other buttons are function buttons, through
which, you can enter different function menus or obtain a specific function application
directly.
7
3
5 4
6
12
Figure 3-1 Front panel
1. Display area
2. Menu selection buttons: Select the right menu item.
3. Control (button and rotary control) area
4. Probe Compensation: Measurement signal (5V/1kHz) output.
5. Signal Input Channel
6. USB Host port: It is used to transfer data when external USB equipment connects to
the oscilloscope regarded as "host device". For example: Saving the waveform to USB
flash disk needs to use this port.
7. Power on/off

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Rear Panel
5
12
3
4
Figure 3-2 Rear Panel
1. Handle
2. Air vents
3. AC power input jack
4. Feet: Adjust the tilt angle of the oscilloscope.
5. USB Device port: It is used to transfer data when external USB equipment connects
to the oscilloscope regarded as "slave device". For example: to use this port when
connect PC to the oscilloscope by USB.

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Control Area
61
2
3
5
4
Figure 3-3 Control Area Overview
1. Function button area: Total 6 buttons.
2. Horizontal control area with 1 button and 2 rotary controls.
"HOR" button refer to horizontal system setting menu, "Horizontal Position" rotary
control control trigger position, " Horizontal Scale" control time base.
3. Trigger control area with 2 buttons and 1 rotary control.
The Trigger Level rotary control is to adjust trigger voltage. Other 2 buttons refer to
trigger system setting.
4. Copy button: This button is the shortcut for Save function in the Utility function
menu. Pressing this button is equal to the Save option in the Save menu. The
waveform, configure or the display screen could be saved according to the chosen type
in the Save menu.
5. Vertical control area with 3 buttons and 4 rotary controls.
"CH1" and "CH2 " correspond to setting menu in CH1 and CH2, "Math" button refer
to math menu, the math menu consists of six kinds of operations, including CH1-CH2,
CH2-CH1, CH1+CH2, CH1*CH2, CH1/CH2 and FFT. Two "Vertical Position"
rotary control control the vertical position of CH1/CH2, and two "Scale" rotary
control control voltage scale of CH1, CH2.
6. Mrotary control(Multipurpose rotary control): when a symbol appears in the
menu, it indicates you can turn the M rotary control to select the menu or set the value.
You can push it to close the menu on the left and right.

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User Interface Introduction
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21
18
67
9
13
14
20
23
5
19
24
15
11
48
22
22
10
12
17 16
Figure 3-4 Illustrative Drawing of Display Interfaces
1. Waveform Display Area.
2. Run/Stop
3. The state of trigger, including:
Auto: Automatic mode and acquire waveform without triggering.
Trig: Trigger detected and acquire waveform.
Ready: Pre-triggered data captured and ready for a trigger.
Scan: Capture and display the waveform continuously.
Stop: Data acquisition stopped.
4. The two blue dotted lines indicates the vertical position of cursor measurement.
5. The T pointer indicates the horizontal position for the trigger.
6. The pointer indicates the trigger position in the record length.
7. It shows present triggering value and displays the site of present window in
internal memory.
8. It indicates that there is a USB disk connecting with the oscilloscope.
9. Channel identifier of current menu.
10. The waveform of CH1.
11. Right Menu.
12. The waveform of CH2.

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13. Current trigger type:
Rising edge triggering
Falling edge triggering
Video line synchronous triggering
Video field synchronous triggering
The reading shows the trigger level value of the corresponding channel.
14. It indicates the measured type and value of the corresponding channel. "T" means
period, "F" means frequency, "V" means the average value, "Vp" the peak-peak
value, "Vr" the root-mean-square value, "Ma" the maximum amplitude value,
"Mi" the minimum amplitude value, "Vt" the Voltage value of the waveform's
flat top value, "Vb" the Voltage value of the waveform's flat base, "Va" the
amplitude value, "Os" the overshoot value, "Ps" the Preshoot value, "RT" the rise
time value, "FT" the fall time value, "PW" the +width value, "NW" the -Width
value, "+D" the +Duty value, "-D" the -Duty value, "PD" the Delay A->B
value, "ND" the Delay A->B value, "TR" the Cycle RMS, "CR" the Cursor
RMS, "WP" the Screen Duty, "RP" the Phase, "+PC" the +Pulse count, "-PC"
the - Pulse count, "+E" the Rise edge count, "-E" the Fall edge count, "AR" the
Area, "CA" the Cycle area.
15. The readings show the record length.
16. The frequency of the trigger signal.
17. The readings show current sample rate.
18. The readings indicate the corresponding Voltage Division and the Zero Point
positions of the channels. "BW" indicates bandwidth limit.
The icon shows the coupling mode of the channel.
"—" indicates direct current coupling
"～" indicates AC coupling
" " indicates GND coupling
19. The reading shows the setting of main time base.
20. It is cursor measure window, showing the absolute values and the readings of the
cursors.
21. The blue pointer shows the grounding datum point (zero point position) of the
waveform of the CH2 channel. If the pointer is not displayed, it means that this
channel is not opened.
22. The two blue dotted lines indicate the horizontal position of cursor measurement.
23. The yellow pointer indicates the grounding datum point (zero point position) of
the waveform of the CH1 channel. If the pointer is not displayed, it means that
the channel is not opened.

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How to Implement the General Inspection
After you get a new oscilloscope, it is recommended that you should make a check on
the instrument according to the following steps:
1. Check whether there is any damage caused by transportation.
If the packing boxes or foam cushions are found to have serious damage, keep them in
a safe place until the complete instrument and accessories have passed the electrical
and mechanical tests.
2. Check the Accessories
Check that all the parts and accessories are included and in serviceable condition.
3. Check the Complete Instrument
If the instrument is damaged in its appearance or it fails in normal operation or
performance test, do not use it and contact the supplier directly.
How to Implement the Function Inspection
Make a fast function check to verify the normal operation of the instrument, according
to the following steps:
1. Connect the power cord to a power source. Press the button on the bottom
left of the unit.
The instrument carries out all self-check items and shows the Boot Logo. Push the
Utility button, select Function in the right menu. Select Adjust in the left menu,
select Default in the right menu. The default attenuation coefficient set value of the
probe in the menu is 10X.
2. Set the Switch in the Oscilloscope Probe as 10X and Connect the Oscilloscope
with CH1 Channel.
Align the slot in the probe with the plug in the CH1 connector BNC, and then tighten
the probe with rotating it to the right side.
Connect the probe tip and the ground clamp to the connector of the probe
compensator.
3. Press the "Autoset" Button.
The square wave of 1 KHz frequency and 5V peak-peak value will be displayed in
several seconds (see Figure 3-5).

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Figure 3-5 Auto set
Check CH2 by repeating Step 2 and Step 3.
How to Implement the Probe Compensation
When connect the probe with any input channel for the first time, make this
adjustment to match the probe with the input channel. The probe which is not
compensated or presents a compensation deviation will result in the measuring error
or mistake. For adjusting the probe compensation, please carry out the following
steps:
1. Set the attenuation coefficient of the probe in the menu as 10X and that of the
switch in the probe as 10X (see "How to Set the Probe Attenuation Coefficient"
on P11), and connect the probe with the CH1 channel. If a probe hook tip is used,
ensure that it keeps in close touch with the probe. Connect the probe tip with the
signal connector of the probe compensator and connect the reference wire clamp
with the ground wire connector of the probe connector, and then push the
Autoset button on the front panel.
2. Check the displayed waveforms and regulate the probe till a correct
compensation is achieved (see Figure 3-6 and Figure 3-7).
Overcompensated Compensated correctly Under compensated
Figure 3-6 Displayed Waveforms of the Probe Compensation
3. Repeat the steps mentioned if needed.

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Figure 3-7 Adjust Probe
How to Set the Probe Attenuation Coefficient
The probe has several attenuation coefficients, which will influence the vertical scale
factor of the oscilloscope.
To change or check the probe attenuation coefficient in the menu of oscilloscope:
(1) Push the function menu button of the used channels (CH1 or CH2 button).
(2) Select Probe in the right menu; turn the Mrotary control to select the proper
value in the left menu corresponding to the probe.
This setting will be valid all the time before it is changed again.
Caution:
The default attenuation coefficient of the probe on the instrument is preset to
10X.
Make sure that the set value of the attenuation switch in the probe is the
same as the menu selection of the probe attenuation coefficient in the
oscilloscope.
The set values of the probe switch are 1X and 10X (see Figure 3-8).
Figure 3-8 Attenuation Switch
Caution:
When the attenuation switch is set to 1X, the probe will limit the bandwidth
of the oscilloscope in 5MHz. To use the full bandwidth of the oscilloscope,
the switch must be set to 10X.

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How to Use the Probe Safely
The safety guard ring around the probe body protects your finger against any electric
shock, shown as Figure 3-9.
Figure 3-9 Finger Guard
Warning:
To avoid electric shock, always keep your finger behind the safety guard
ring of the probe during the operation.
To protect you from suffering from the electric shock, do not touch any
metal part of the probe tip when it is connected to the power supply.
Before making any measurements, always
connect the probe to the
instrument and connect the ground terminal to the earth.
How to Implement Self-calibration
The self-calibration application can make the oscilloscope reach the optimum
condition rapidly to obtain the most accurate measurement value. You can carry out
this application program at any time. This program must be executed whenever the
change of ambient temperature is 5℃or over.
Before performing a self-calibration, disconnect all probes or wires from the input
connector. Push the Utility button, select Function in the right menu, select Adjust.
in the left menu, select Self Cal in the right menu; run the program after everything is
ready.
Introduction to the Vertical System
As shown in Figure 3-10, there are a few of buttons and rotary controls in Vertical
Controls. The following practices will gradually direct you to be familiar with the
using of the vertical setting.

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Figure 3-10 Vertical Control Zone
1. Use the Vertical Position rotary control to show the signal in the center of the
waveform window. The Vertical Position rotary control functions the regulating of
the vertical display position of the signal. Thus, when the Vertical Position rotary
control is rotated, the pointer of the earth datum point of the channel is directed to
move up and down following the waveform.
Measuring Skill
If the channel is under the DC coupling mode, you can rapidly measure the DC
component of the signal through the observation of the difference between the wave
form and the signal ground.
If the channel is under the AC mode, the DC component would be filtered out. This
mode helps you display the AC component of the signal with a higher sensitivity.
Vertical offset back to 0 shortcut key
Turn the Vertical Position rotary control to change the vertical display position of
channel and push the position rotary control to set the vertical display position back to
0 as a shortcut key, this is especially helpful when the trace position is far out of the
screen and want it to get back to the screen center immediately.
2. Change the Vertical Setting and Observe the Consequent State Information Change.
With the information displayed in the status bar at the bottom of the waveform
window, you can determine any changes in the channel vertical scale factor.
Turn the Vertical Scale rotary control and change the "Vertical Scale Factor
(Voltage Division)", it can be found that the scale factor of the channel
corresponding to the status bar has been changed accordingly.
Push buttons of CH1, CH2 and Math, the operation menu, symbols, waveforms
and scale factor status information of the corresponding channel will be displayed
in the screen.

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Introduction to the Horizontal System
Shown as Figure 3-11, there are a button and two rotary controls in the Horizontal
Controls. The following practices will gradually direct you to be familiar with the
setting of horizontal time base.
Figure 3-11 Horizontal Control Zone
1. Turn the Horizontal Scale rotary control to change the horizontal time base
setting and observe the consequent status information change. Turn the
Horizontal Scale rotary control to change the horizontal time base, and it can be
found that the Horizontal Time Base display in the status bar changes
accordingly.
2. Use the Horizontal Position rotary control to adjust the horizontal position of the
signal in the waveform window. The Horizontal Position rotary control is used
to control the triggering displacement of the signal or for other special
applications. If it is applied to triggering the displacement, it can be observed that
the waveform moves horizontally with the rotary control when you rotate the
Horizontal Position rotary control.
Triggering displacement back to 0 shortcut key
Turn the Horizontal Position rotary control to change the horizontal position of
channel and push the Horizontal Position rotary control to set the triggering
displacement back to 0 as a shortcut key.
3. Push the Horizontal HOR button to switch between the normal mode and the
wave zoom mode.

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Introduction to the Trigger System
As shown in Figure 3-12, there are one rotary control and three buttons make up
Trigger Controls. The following practices will direct you to be familiar with the
setting of the trigger system gradually.
Figure 3-12 Trigger Control Zone
1. Push the Trigger Menu button and call out the trigger menu. With the operations
of the menu selection buttons, the trigger setting can be changed.
2. Use the Trigger Level rotary control to change the trigger level setting.
By turning the Trigger Level rotary control, the trigger indicator in the screen
will move up and down. With the movement of the trigger indicator, it can be
observed that the trigger level value displayed in the screen changes accordingly.
Note: Turning the Trigger Level rotary control can change trigger level value
and it is also the hotkey to set trigger level as the vertical mid point values of the
amplitude of the trigger signal.
3. Push the Force button to force a trigger signal, which is mainly applied to the
"Normal" and "Single" trigger modes.

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4. Advanced User Guidebook
This chapter will deal with the following topics mainly:
How to Set the Vertical System
How to Set the Horizontal System
How to Set the Trigger System
How to Set the Sampling/Display
How to Save and Recall Waveform
How to Implement the Auxiliary System Function Setting
How to Measure Automatically
How to Measure with Cursors
How to Use Executive Buttons
It is recommended that you read this chapter carefully to get acquainted the various
measurement functions and other operation methods of the oscilloscope.

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How to Set the Vertical System
The VERTICAL CONTROLS includes three menu buttons such as CH1, CH2 and
Math,and four rotary controls such as Vertical Position, Vertical Scale for each
channel.
Setting of CH1 and CH2
Each channel has an independent vertical menu and each item is set respectively
based on the channel.
To turn waveforms on or off (channel, math)
Pushing the CH1,CH2, or Math buttons have the following effect:
• If the waveform is off, the waveform is turned on and its menu is displayed.
• If the waveform is on and its menu is not displayed, its menu will be displayed.
• If the waveform is on and its menu is displayed, the waveform is turned off and its
menu goes away.
The description of the Channel Menu is shown as the following list:
Function
Menu
Setting
Description
Coupling
DC
AC
Ground
Pass both AC and DC components of the input signal.
Block the DC component of the input signal.
Disconnect the input signal.
Inverted
ON
OFF
Display inverted waveform.
Display original waveform.
Probe
1X
10X
100X
1000X
Match this to the probe attenuation factor to have an
accurate reading of vertical scale.
MeasCurr Yes
No
If you are measuring current by probing the voltage
drop across a resistor, choose Yes.
A/V
or mA/V
V/A
or mV/A
Turn the Mrotary control to set the Amps/Volts
ratio. The range is 100 mA/V - 1 KA/V.
Amps/Volts ratio = 1/Resistor value
Volts/Amp ratio is automatically calculated.
Limit (only
for
MP720011)
Full band
20M
Get full bandwidth.
Limit the channel bandwidth to 20MHz to reduce
display noise.
1. To set channel coupling
Taking the Channel 1 for example, the measured signal is a square wave signal
containing the direct current bias. The operation steps are shown as below: