MUSTOOL MDS8207 User manual

Oscilloscope
Multimeter
User’s Manual

Preface
Dear users,
Thank you for purchasing this digital oscilloscope multi-meter. We believe its innovative function combination
and humanized design will bring great convenience to your site tests. Before use, please carefully read this manual,
especial the part of “Safety Instructions”. Please also keep this manual property for future reference.
Contents
SAFETY INSTRUCTIONS..............................................................................................................................................1
INTRODUCTION TO THE INSTRUMENT.................................................................................................................. 4
Main features.............................................................................................................................................................4
Button functions........................................................................................................................................................5
BASIC OPERATION....................................................................................................................................................... 6
Start-up and shutdown.............................................................................................................................................. 6
Automatic sleep.........................................................................................................................................................6
OPERATIONS OF THE SCOPEMETER........................................................................................................................7
Entering into the scopemeter mode.......................................................................................................................... 7
Basic displayed items under the scopemeter mode.................................................................................................. 7

Function buttons and main option menu.................................................................................................................. 8
Selection of coupling means of input signal.............................................................................................................9
Time base control......................................................................................................................................................9
Adjustment of horizontal position.......................................................................................................................... 10
Vertical amplitude control.......................................................................................................................................11
Trigger control.........................................................................................................................................................11
Adjustment of trigger level..................................................................................................................................... 12
About the trigger mode........................................................................................................................................... 13
Prompt message of scanning status........................................................................................................................ 13
Trigger operations of single scan............................................................................................................................14
Cursor measurement reading function....................................................................................................................15
Automatic measurement of waveform....................................................................................................................17
Automatic setting of scanning parameters..............................................................................................................18
Holding of signal waveform................................................................................................................................... 19
Storage and reading of waveform of signals.......................................................................................................... 20
OPERATIONS OF MULTIMETER.............................................................................................................................. 24
Entering into the mode of multimeter.....................................................................................................................24
Basic content displayed under mutlimeter mode....................................................................................................24

Switching measurement function............................................................................................................................25
Selection of manual/automatic measuring range....................................................................................................26
Relative value measuring mode..............................................................................................................................27
Holding of measurement data................................................................................................................................. 28
Peak value holding (P-H) mode..............................................................................................................................29
AC and DC voltage measurement.......................................................................................................................... 30
Measurement of AC and DC current (500mA, 10A)............................................................................................. 32
Frequency counting and measurement of duty ratio.............................................................................................. 33
Resistance measurement......................................................................................................................................... 35
Capacitor measurement...........................................................................................................................................38
Temperature measurement...................................................................................................................................... 39
Measurement of amplification factor of triode.......................................................................................................39
Storage and reading of measurement data..............................................................................................................40
TECHNICAL PARAMETERS AND THE ENTIRE SET OF INSTRUMENT........................................................... 42
Features and technical parameters of the instrument............................................................................................. 42
Symbols and icons.................................................................................................................................................. 46
Entire set of instrument and optional fittings......................................................................................................... 48
DAILY MAINTENANCE AND TROUBLESHOOTING............................................................................................49

1
Safety Instructions
This digital oscilloscope multi-meter is designed in conformity with safety specifications of IEC1010-1. Second
category of overvoltage measurement: CAT III - 1000V; pollution protection level: Level 1.
1. Before use, please check the housing first to see if it has any crack or any required plastic part is missing. Do
not use instrument with broken housing. Special attention shall be paid to the insulating layer of test leads and
connecting lines. When using test leads, do not touch the metal part of the probe of test leads with your finger;
2. Do not operate the multimeter in high-temperature, moist, rainy, inflammable and explosive environment or
when the instrument is wet;
3. Never apply any voltage or current which exceeds the maximum limit of the instrument;
Measuring function
Input end used
Maximum limit
V DC
V/，COM
1000V DC+AC peak value, within 10 seconds
V AC
V/，COM
750V DC+AC virtual value, within 10 seconds
Hz%
V/，COM
750V DC+AC virtual value, within 10 seconds
mA AC/ DC
500mA，COM
500mA DC/AC virtual value, 250V/500mA fuse protective tube
A AC/ DC
10A，COM
10A DC/AC virtual value, within 30 seconds. 15-minute interval for
cooling. 250V/10A fuse protective tube

2
V/，COM
250V DC/AC virtual value, within 10 seconds
℃
V/，COM
250V DC/AC virtual value, within 10 seconds
hFE
V/，COM
250V DC/AC virtual value, within 10 seconds
4. When changing measuring function, please make sure the probe of test leads is taken away from the test point
before plugging in/out the plug of test leads and before switching on/off the device.
5. Pay attention to the safety warning signal displayed on the instrument: When the measured voltage exceeds the
"safety voltage" (24VDC/AC), a warning information “ ”is displayed to remind you;
6. When the voltage to earth on the reference end "COM" of the instrument reaches 500V, please do not make
voltage measurement;
7. Please do not make AC current measurement of circuits with a voltage of over AC 250V;
8. When measuring functions are pointed at the gears of current, resistance, continuity test, diode, capacitance
and ℃ etc., never bridge the test leads over the two ends of the probe of voltage;
9. Before the test of resistance, diode/continuity test, the power of the equipment to be tested must be cut off and
make sure the capacitor of the circuit has been fully discharged;
10. Before opening the back cover of instrument for replacement of protective tube, the power of the instrument
must be turned off and the test lead should be kept away from the circuit to be tested; protective tube of the
same specification must be used for replacement;
11. Do not alter or dismantle the product or its accessories or use them for purposes other than the purpose for
which the product is designed. No accessory and attachment may be replaced casually.

3
Safety signs
Caution, danger! This sign appears near other signs or socket terminals to remind users that the
instruction of the manual must be followed during operation, so as to prevent damage to the
instrument/personal injury.
Caution, electricity shock! This sign appears near one or more terminals to indicate that there may
be hazard voltage in the terminal(s) during use. To ensure utmost safety, please avoid touching the
testing end of test leads when there is voltage in the terminal(s).
Instruction!
Instruction suggests that special attention should be paid during operation, as wrongful operation
will result in incorrect measurement result or damage of accessories.
Attention!
Attention suggests that the operation must be done very carefully, as wrongful operation or
violation may result in damage of the product or other property.
Warning!
Warning suggests that high concentration is required during operation, as wrongful operation or
violation may result in personal injury or even endangering of life.

4
Introduction to the Instrument
Main features
◆200Msps high-speed sampling, 40MHz analog bandwidth, 6000 digital multimeter
◆Rotary knob for switching oscillography with three types of waveform scanning mode i.e. automatic mode,
regular mode and single-time mode
◆Save function for data and waveform in the measurement; a total of 100 sets of data and 50 waveform can be
saved
◆Parameters i.e. time base and waveform scanning mode can be set in measurement of waveform
◆TRMS, measure the virtual value of waveform without taking into account the waveform parameter and distortion
◆REL, effectively eliminate the lead resistance, distributed capacitance and interference signal
◆The functions include DC/AC voltage/current, resistance, capacitance, frequency, temperature, diode/continuity
test, triode
◆Automatic/manual switching for measuring range and display of measurement data and historic data on the same
screen
◆Overload protection 500mA/10A double protective tube, dual protection of the instrument
◆Automatic shutdown in case of no operations for 15 minutes: bright backlight and clear display
◆higher reliability: no adjustment of potentiometer is required for panel calibration and internal storage calibration

5
Button functions
BUTTONS
Name
Function
F1 ~ F4
The actual function varies with the
measuring range and work mode. The
option menu displayed on the LCD serves
as the prompt for action.
R
Waveform capture button
S
Data save button
Instrument switch
AC/DC Voltage/Frequency/Duty ratio
Resistance/Diode/Continuity test/
Capacitance
Temperature
Triode
AC/DC mA
AC/DC 10A
AC waveform
DC waveform

6
Basic operation
Start-up and shutdown
Rotate the rotary knob to desired measurement gear and the power is connected to the instrument; rotate the
rotary knob to OFF position to turn off the power.
Attention！
• Keep the testing probe away from the test point before turning off the instrument
• The power must be timely turned off after use of the instrument
Automatic sleep
If there is no operation for a set period of time, the instrument will get into automatic sleep. To turn off the
function of automatic sleep, user may press the “R” button and then rotate the rotary knob to turn on the instrument.
In this way, the instrument is set to continuous working mode. To prevent over discharge of battery inside the
instrument, the instrument may also get into automatic sleep when the electricity of batter is about to be exhausted.
After the function of automatic close is initiated, a sleep symbol of “ ” will be displayed less than 1 minute
before the instrument gets into sleep mode.

7
Operations of the scopemeter
Entering into the scopemeter mode
Rotate the rotary knob to select the scopemeter (OSC) mode
Instructions!
As no shielding measures are provided for the testing rod of the multimeter, it hard to thoroughly
eliminate the interference when using the testing rod of the multimeter for waveform test. To
meet the needs of high quality test, user may purchase adapters and high-frequency shielding
lines. Please consult the Company’s Products Service Center for details.
Basic displayed items under the scopemeter mode

8
Function buttons and main option menu
The function buttons of F1~F4 are located at the lower of the LCD screen. With the option menu on the screen,
these buttons will enable users to realize several functions. Some functions are provided with sub-option menu for
further operations. Please refer to relevant later sections for the usage of these option menu and optional option
menu.
The main option menu provides the instructions for basic operations of the instrument and the details are as
follows:
Horizontal adjustment
Vertical adjustment
Triggering control
Cursor function
TIME
VOLT
TRIG
CURS
F1
F2
F3
F4
1. Press F1 button (TIME) to enter into sub-option menu of time base setting and adjust the scanning time base and
triggering position
2. Press F2 button (VOLT) to enter into sub-option menu of vertical sensitivity setting and adjusts the vertical
amplitude and waveform position
3. Press F3 button (TRIG) to enter into sub-option menu of trig setting and adjust the trigger level, gradient and
mode.
4. Press F4 button (CURS) to enter into cursors measurement function. This function is valid only after completion
of waveform holding or single-time scanning and is not displayed at other time.

9
Selection of coupling means of input signal
The selected input coupling will determine what part of signal is allowed to be transmitted to the scopemeter.
The coupling means include DC/AC types.
DC coupling
The AC and DC part of signal is allowed pass through.
AC coupling
The DC part of signal is blocked but the dynamic AC part is allowed to pass through.
Time base control
Under the main option menu of scopemeter, press F1 button to enter into the sub-option menu of scanning time
base control:
Back
Adjustment of scanning time base
Horizontal position
EXIT
◄
►
POS
F1
F2
F3
F4
1. Press F1 button (EXIT) to exit the sub-option menu of time base setting and back to the main option menu.
2. Press F2 button (◄) and F3 button (►) to adjust the time base (t /div).
3. Press F4 button (POS) to enter into the sub-option menu of adjustment of triggering position (horizontal position)
Instructions!
• When measuring a signal whose frequency is unknown, user has to try to collect the waveform
from the fastest time base and then gradually select the slower time base until the signal can be
displayed correctly. Otherwise, due to “aliasing effect”, waveform may fail to correctly reflect the
actual situation of the signal.
• There are several ways to avoid aliasing effect: adjust the time base or press“R”button.

10
Adjustment of horizontal position
Under the sub-option menu of scanning time base setting, press F4 button (POS) to enter into the sub-option of
adjustment of triggering position. With the change of triggering position, the horizontal position of waveform will
change accordingly. Therefore, the adjustment of triggering position is also referred to as adjustment of horizontal
position.
Back
Adjustment of horizontal position
Center the horizontal position
EXIT
◄
►
RESET
F1
F2
F3
F4
1. Press F1 button (EXIT) to exit the sub-option menu of adjustment of waveform horizontal position and back to the
sub-option menu of scanning time base setting.
2. Press F2 button (◄) and F3 button (►) to adjust the position of scanning trigger point and the horizontal position
of waveform on the screen is changed accordingly. The current scanning trigger point is marked on the monitor.
3. Press F4 button (RESET) to set the trigger point to default position (the right center of the screen).

11
Vertical amplitude control
Under the main option menu of scopemeter mode, press F2 button (VOLT) to enter into the sub-option menu of
vertical control:
Back
Adjustment of vertical sensativity
Vertical position
EXIT
▼
▲
F1
F2
F3
F4
1. Press F1 button (EXIT) to exit the sub-option menu of vertical control and back to main option menu.
2. Press F2 button (▼) and F3 button (▲) to adjust the vertical amplitude (V/div).
Instruct
ions!
To ensure the stability of circuit inside the instrument, the movement of adjustment of sensitivity may
be a little delayed during adjustment of vertical sensitivity by pressing F2 button or F3 button.
Trigger control
Under the main option menu of scopemeter mode, press F3 button (TRIG) to enter into the sub-option menu of
trigger setting:
Back
Trigger edge
Triggerring mode
Trigger level
EXIT
MODE
LEVEL
F1
F2
F3
F4

12
1. Press F1 button (EXIT) to exit the sub-option menu of trigger setting and back to the main option menu.
2. Press F2 button ( or ) to select the rising or descending edge triggering.
3. Press F3 button (MODE) to select the trigger mode.
4. Press F4 button (LEVEL) to enter into the sub-option menu of adjustment of trigger level.
Adjustment of trigger level
Under the sub-option menu of trigger setting, press F4 to enter into sub-option menu of adjustment of trigger
level:
Back
Adjustment of trigger level
Reset of trigger level
EXIT
▼
▲
RESET
F1
F2
F3
F4
1. Press F1 button (EXIT) to exit the sub-option menu of adjustment of trigger level and back to the sub-option menu
of trigger setting.
2. Press F2 button (▼) and F3 button (▲) to reduce or increase trigger level. The current corresponding position of
trigger level is marked on the monitor.
3. Press F4 button (RESET) to set the electrical level to 0 volt.

13
About the trigger mode
Automatic: Even if no trigger conditions are detected, the scopemeter can still collect waveforms. If there are no
trigger conditions, the scopemeter will be automatically triggered and start to collect data after waiting for a certain
period of time. As it’s not correctly triggered, the waveform displayed by the scopemeter will scroll on the screen
due to failure of synchronization. Once legal trigger signals are detected, the waveform will become stable on the
screen. User may use this mode to monitor low-frequency irregular signal or observe the amplitude of signals, such
as waveform of DC power etc.
Normal: After trigger signals are detected, the scopemeter will start collecting waveform data. If there is no
triggering, the socpemeter will not collect new waveforms. The content of monitor will not be refreshed.
Single : In single-time mode, once trigger conditions are detected, the scopemeter will start to collect waveform
data. After new data is collected, the latest waveform will be automatically saved.
Prompt message of scanning status
Auto
Automatic mode. Waveform can be collected even without trigger conditions.
Ready
Waiting for trigger conditions.
Trig’d
Trigger conditions has been detected.

14
Trigger operations of single scan
The data collection of single trigger is carried out in the following steps:
1. Adjust the vertical amplitude V/div and horizontal amplitude to adapt to the waveform to be collected.
2. Select appropriate trigger level, gradient and then select single trigger mode.
3. Once signals are appeared, the scopemeter will be triggered to capture the signals.

15
Instructions!
After waveform is held, press F4 button to activate the cursor measurement function; press “S”
button for 2 seconds to save the waveform.
One single trigger mode is selected, any adjustment to waveform will be prohibited. If you want
to change scanning time base, vertical amplitude, coupling means and waveform position etc.,
please press F3 button (TRIG) to activate the adjustment of trigger mode and adjust the trigger
mode to automatic mode or normal mode.
Cursor measurement reading function
The cursor measurement reading function can be used to measure the voltage difference (ΔV) or time difference
(Δt) between the two cursors on the monitor. When ΔV measurement function is selected, the scopemeter will
generate a pair of horizontal cursors; whenΔt measurement function is selected, the scopemeter will generate a pair
of vertical cursors. The voltage difference or time difference between cursors will be displayed on the screen from
time to time.