Tenma 72-7630 User manual

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4 Channel Digital Storage Oscilloscope
Model No. 72-7630

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When using electrical appliances, basic safety precautions should always
be followed to reduce the risk of re, electric shock and injury to persons or
property.
Read all instructions before using the appliance and retain for future reference.
• This meter is designed to meet IEC61010-1, 61010-2-032, and 61010-2-033 in
Pollution Degree 2, Measurement Category CAT II 600V and double Insulation.
• Check that the voltage indicated on the rating plate corresponds with that of the
local network before connecting the product to the mains power supply.
• Do not operate this product with a damaged plug or cord, after a malfunction or
after being dropped or damaged in any way.
• Check the product before use for any damage. Should you notice any damage on
the cable or casing, do not use.
• This product contains no user-serviceable parts. All repairs should only be carried
out by a qualied engineer. Improper repairs may place the user at risk of harm.
• Take caution when voltages are above 60V DC and 30V ACrms.
• The earth probe must only be used to connect to ground, never connect to a
voltage source.
• This product must be earthed using the mains power cord ground connection.
• Do not disconnect from the mains supply and it’s ground connection when any item
is connected to this product for measurement.
• Children should be supervised to ensure that they do not play with the product.
• Always disconnect from the mains when the product is not in use or before
cleaning.
• Do not use the product for any purpose other than that for which it is designed.
• Do not operate or store in an environment of high humidity or where moisture may
enter the product as this can reduce insulation and lead to electric shock.
PRODUCT OVERVIEW
Main Features
• Four analogue channels with HD colour LCD display
• Automatic waveform and status conguration
• Multi‐waveform mathematical operation function
• Automatic measurement of 24 waveform parameters
• Edge, video, pulse width and alternate trigger functions
• Supports plug and play USB storage devices and communication with PC
• Built‐in FFT software function
• Unique waveform recording and replay function
WHAT’S INCLUDED
• Digital Oscilloscope Unit
• Mains power lead
• User Manual
• Software CD
• USB lead
• 2 x selectable 1:1/10:1 passive voltage probes
• 2 x multimedia test leads
• Current to voltage conversion module (optional accessory)

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CONTROLS AND CONNECTIONS
OPERATING PARAMETERS
• The oscilloscope also has high performance index and powerful functions required
for faster measurements. Faster signals can be observed with the oscilloscope via
2GS/s (or 50GS/s) equivalent sampling.
• Powerful trigger and analysis ability make it easier to capture and analyse
waveforms.
• Clear LCD and mathematical operating functions make it easy to use to observe
and analyse signal problems in a faster and clearer way.
control

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Accessing signals
• Power on the unit then allow the self test to complete.
• Press UTILITY button then F1 and the screen will display DEFAULT SETUP.
Note: The meter has quad input channels plus one external trigger input channel.
• Press CH1 to enter channel 1 menu.
• Connect the probe to the Ch1 input.
• Set the probe attenuation switch to 10X position.
Note: The oscilloscope attenuation has to be set as well.
• Press F4 until 10X displays. This changes the vertical range multiple to ensure the
measurement result correctly reects the amplitude of the measured signal.
• Connect both probe and ground clamp to the corresponding signal terminals.
• Press AUTO and a square wave of about 3V at 1kHz is displayed for a moment.
• Press OFF then CH2 and repeat for channel 2.
OPERATION
AUTOSET WAVEFORM DISPLAY
Probe compensation
• Perform this adjustment when connecting the probes to any input channel for the
rst time or errors in the measurement may result.
• Connect the probe tip to the probe compensator’s signal output connector and
connect the ground clamp to the earth wire of the probe compensator.
• Enable CH1 and press AUTO.
• Observe the shape of the displayed waveform.
• Adjust the variable capacitor on the probe with an insulated screwdriver until a
correct waveform is achieved.
• The oscilloscope features an autoset function which automatically adjusts the
vertical deection factor, scanning time base and trigger mode based on the input
signal until the most appropriate waveform is displayed.
• This function only operates when the signal to be measured is 50Hz or above and
the duty ratio is larger than 1%.
Probe compensation

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DISPLAY SETTING CONTROLS
Using the Autoset function
• Connect the signal to be measured to the signal input channel.
• Press AUTO and the oscilloscope will scan the time base and trigger mode and set
the vertical deection factor. You can manually adjust further after this process to
get the optimum display.
Vertical control panel
• The POSITION control centres the waveform in
the display.
• Press CH1, CH2, CH3, CH4, MATH or
REFERENCE and the screen shows the
corresponding operation menu, sign, waveform
and range status information.
• Use VOLTS/DIV (CH1, CH2, CH3, CH4) to set
the vertical gratitude factor.
• Press OFF to disable the selected channel.
Horizontal control panel
• Horizontal position control adjusts the position of the waveform window by
adjusting the trigger shift of the signal.
• The horizontal scale adjustment changes the SEC/DIV time base range
and the current status indicator will change accordingly.
• The horizontal scanning rate range is 5ns - 50ns in steps of 1-2-5.
Note: the horizontal scanning time base range varies between models - see
table in specication section.
Trigger system
• The trigger level rotary control adjusts the trigger level. The display value changes
on the display as you make adjustment.
• Press MENU to select the trigger options.
• Press F1 and set EDGE TRIGGER.
• Press F2 and set SIGNAL SOURCE to CH1.
• Press F3 then F1 and set DC as
COUPLING.
• Press F4 then F1 and set MODE as
AUTO.
• Press F5 then F2 and set RISE for
SLOPE.

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INSTRUMENT SETUP
Vertical system setup
• Each channel CH1, CH2, CH3 or CH4 has it’s own vertical menu. Each channel
should be set up individually.
• Press CH1 to CH4 and the system will display the operation menu for that channel.
Channel coupling setup
• If for example a signal is applied to CH1
which has a sine signal that contains DC
quantities.
• Press F1 to select AC and set up as AC
coupling. Any DC quantities in the signal are
now intercepted.
• Press F1 to select DC.
• Both AC and DC quantities of the signal
being measured can now pass through.
• The waveform displays both AC and DC
quantities of the signal.
• Press F1 to select GROUND.
Both AC and DC quantities of the signal
being measured are now intercepted.
• The waveform is not displayed in this mode
but the signal remains connected
to the channel circuit.
Functions Menu Setup Notes
Coupling
AC
DC
Intercepts the DC quantities of the input signal.
Pass AC and DC quantities of input signal
GROUND Displays reference ground level without
disconnecting the input signal
Bandwidth Limit On Limit bandwidth to 20MHz to reduce noise display.
Off Full bandwidth
Volts / DIV
Coarse tune Coarse tune in steps of 1-2-5 to set up the
deection factor of the vertical system.
Fine tune Fine tune is further tuning within the coarse tune
set up to improve the vertical resolution.
Probe 1X, 10X, 100X
and 1000X
Select either value based on the probe attenuation
factor to keep the vertical deection factor reading
correct.
Invert On Waveform invert function on.
Off Normal waveform display.

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Channel bandwidth setup
• If for example a signal is applied to CH1
which is a pulse signal that contains high
frequency oscillation.
• Press CH1 to select Channel1.
• Press F2 to set the BANDWIDTH LIMIT
OFF so it is set up as full bandwidth.
• The signal being measured can now pass
through even if it contains high frequency quantities.
• Press F2 to set BANDWIDTH LIMIT ON
so that frequency quantities higher than
20MHz in the signal being measured will
be limited.
Probe rate setup
• To match the probe attenuation factor
setup, it is necessary to set up the probe
attenuation factor in the channel operation
menu accordingly.
• For example when the probe attenuation
factor is 10:1, set the probe attenuation
factor at 10X in the menu. This principle
applies to other values to ensure the voltage reading is correct.
Waveform inversion setup
• The displayed signal is inverted 180 degrees
with respect to the
ground level.
Vertical Volts/Div adjustment setup
• The VOLTS/DIV range of the vertical
deection factor can be adjusted either in
coarse or ne tune mode.
• In COARSE TUNE the VOLTS/DIV range is
2mV/div~5V/div. Tuning is in steps of 1-2-5.
• In FINE TUNE mode the deection factor
can be adjusted in smaller steps allowing
continuous adjustment within the range
2mV/div~5V/div without interruption.

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Operating Math functions
• Math functions are displays of +, -, x, ÷and
FFT mathematical results of CH1 and CH2.
The menu options are:-
FFT spectrum analysis
• Using FFT algorithm you can convert the
domain signals (YT) into frequency domain
signals.
• With FFT you can observe the following
types of signals:
1. Measure the harmonic wave
composition and distortion of the
system.
2. Demonstrate the noise characteristics of the DC power.
3. Analyse oscillation.
Functions Menu Setup Notes
Type Math To carry out +, -, x, ÷ functions
Signal source 1 CH1
CH2
CH3
CH4
Set signal source 1 as CH1 waveform
Set signal source 1 as CH2 waveform
Set signal source 1 as CH3 waveform
Set signal source 1 as CH4 waveform
Operator +
-
x
÷
Signal source 1 + Signal source 2
Signal source 1 - Signal source 2
Signal source 1 x Signal source 2
Signal source 1 ÷ Signal source 2
Signal source 2 CH1
CH2
CH3
CH4
Set signal source 2 as CH1 waveform
Set signal source 2 as CH2 waveform
Set signal source 2 as CH3 waveform
Set signal source 2 as CH4 waveform
Compress 1/1
1/10
1/100
1/1000
Scale the waveform by any of the four ratios to chose from
X/Y offset ----- Use the MULTIPURPOSE control to adjust waveform
vertically / horizontally
Functions Menu Setup Notes
Type FFT To carry out FFT algorithm functions
Signal source
CH1
CH2
CH3
CH4
Set CH1 as math waveform
Set CH2 as math waveform
Set CH3 as math waveform
Set CH4 as math waveform
Window
Hanning
Hamming
Blackman
Rectangle
Set Hanning window function
Set Hamming window function
Set Blackman window function
Set Rectangle window function
Vertical coordinate Linear V dB Set the vertical coordinate unit to linear or V dB

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Select the FFT window
• Assuming the YT waveform is constantly repeating itself, the oscilloscope will carry
out FFT conversion of time record of a limited length. When this cycle is a whole
number, the YT waveform will have the same amplitude at the start and nish.
There is no waveform interruption.
• If the YT waveform cycle is not a whole number there will be different amplitudes
at the start and nish, resulting in transient interruption of high frequency at the
connection point. In frequency domain this is known as leakage.
• To avoid leakage multiply the original waveform by one window function to set the
value at 0 for start and nish compulsively. See the following table:
Notes
1. Upper Limit: effective only in low pass ltering - use MULTIPURPOSE control.
2. Lower Limit: effective only in high pass ltering - use MULTIPURPOSE control.
3. Y Offset: use MULTIPURPOSE control to move waveform vertically.
4. X Offset: use MULTIPURPOSE control to adjust vertical gratitude factor.
Digital Filtering Function
FFT Window Feature Most suitable measurement item
Rectangle
The best frequency resolution,
the worst amplitude resolution.
Basically similar to a status
without adding window.
Temporary or fast pulse. Signal level is
generally the same before and after.
Equal sine wave of very similar frequency.
There is broad-band random noise with
slow moving wave spectrum.
Hanning
Frequency resolution is better
than the rectangle window but
amplitude resolution is poorer.
Sine, cyclical and narrow-band random
noise.
Hamming
Frequency resolution is
marginally better than Hanning
window.
Temporary or fast pulse. Signal level varies
greatly before and after.
Blackman
The best amplitude resolution
and the poorest frequency
resolution.
Mainly for single frequency signals to
search for higher-order harmonic wave.
Note: FFT resolution means the quotient of the sampling and math points. When the
math point value is xed, the sampling rate should be as low as possible relative to the
FFT resolution.
• Nyquist frequency: To rebuild the original waveform, at least 2f sampling rate
should be used for waveform with a maximum frequency of f.
• This is known as Nyquist stability criterion, where f is the Nyquist frequency and 2f
is the Nyquist sampling rate.
Functions
Menu Setup Notes
Type Filter Digital ltering
Source
CH1
CH2
CH3
CH4
Set CH1 as lter target
Set CH2 as lter target
Set CH3 as lter target
Set CH4 as lter target
Filter Type
Low Pass
High Pass
Band Pass
Set lter to low pass ltering
Set lter to high pass
ltering
Set lter to band pass
ltering

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Functions Menu Setup Notes
Ref Wave REF A
REF B
Select REF A as the reference waveform
Select REF B as the reference waveform
Load Recall waveforms stored in 10 positions using the
MULTIPURPOSE control. Press to conrm
Off -- Close the recalled waveform
Import USB Enter USB memory to recover stored waveform
File Name -- Use MULTIPURPOSE control and F1 key to set
le name for import from USB device
OK
After conrming you return to REF menu and le is
imported from USB otherwise on error I/O failure
is displayed.
• The Y Offset and Y Level adjustment using the MULTIPURPOSE control is only
available after the reference waveform has been recalled or imported and is
displayed
Horizontal system setup
• The horizontal rotary control is used to change the graticule (time base) and trigger
the horizontal position of the memory (triggering position).
• The vertical centre point above the horizontal orientation of the screen is the time
reference point of the waveform. Changing the graticule will cause the waveform to
increase or decrease in size relative to screen centre. When the horizontal position
changes, the position in respect to the waveform triggering point is also changed.
Horizontal position
• Adjust the horizontal positions of the channel waveforms (including math
waveforms). Resolution of this control changes with the time base.
Horizontal scaling
• Adjusting the main time base i.e. sec/div. When time base extension is on you can
use the horizontal scaling control to change the delay scanning time base and
change the window width and use the horizontal control to change the relative
position if the triggering point on the screen.
Reference waveform
• Displays of the saved reference waveforms can be set on or off in the REF menu.
• The waveforms are saved in non-volatile memory and identied with the following
names: Ref A, Ref B.
• To display (recall) or hide the reference waveforms use the following method:
1. Press REF menu button on the front panel
2. Press F2 to load and select the signal source using the MULTIPURPOSE control
from 1 to 10 then press the control to conrm the selection.
3. Press F1 for ‘Ref B’ to select the second signal source for the math function using
the MULTIPURPOSE control to as in step 2 to select and conrm the selection.
4. Press OFF to close the reference waveform.
Note: When AUTO is pressed after a waveform is recalled that waveform will remain.

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Functions Menu Setup Notes
Window -- Press F1 to switch between the main screen and
expanded window
Dual Xbase -- Enable the dual time base menu
Holdoff 96.0000ns~1.5000s Adjust holdoff time using MULTIPURPOSE control
Icon denitions
1. Represents the signal frequency currently selected
as trigger source.
2. Represents the triggering point of the current
waveform.
3. Represents the trigger level of the current waveform.
4. Distance between the triggering position and the
horizontal centre point.
5. The time base value of the main time base M1
i.e SEC/DIV
Denitions
• YT Mode: in this mode the y axis indicates voltage and the x axis indicates time.
• X-Y Mode: in this mode the X axis indicates CH1 voltage and the Y axis indicates
the CH2 voltage.
• Slow Scanning Mode: When the horizontal time base control is set at 50ms/div or
slower, the unit will operate in the slow scan sampling mode. When observing low
frequency signals in slow scanning mode, it is advised to set the channel coupling
as DC.
• Sec/Div: a horizontal scaling (time base) unit. If waveform sampling is stopped (by
pressing the RUN/STOP button) time base control can expand or compress the
waveform.
Window Extension
• Window extension can be use to zoom in or zoom out a band of waveform to check
image details. The window extension setting must not be slower than that of the
main time base.
• In the time base extension mode, the
display is divided into two zones as shown.
• The upper part displays the original
waveform. You can increase and decrease
the selected zone in size by turning the
horizontal SEC/DIV control.
• The lower part is the horizontally extended
waveform zone.
• Please note that the resolution of extended
time base relative to the main time base is
now higher as shown.
• Since the waveform shown in the entire lower part corresponds to the selected
zone in the upper part, you can increase the extended time base by turning the
horizontal SCALE control to decrease the size of the selected zone (increase the
multiple of waveform extension).

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Setting up the Trigger system
• Triggering decides when the oscilloscope collects data and displays waveforms.
Once the trigger is correctly set up, it can convert unstable display into signicant
waveforms.
• When beginning to collect data the oscilloscope rst collects sufcient data to draw
a waveform on the left of the triggering point.
• While waiting for the triggering condition to occur it will continuously collect data.
When sufcient data to draw a waveform on the right side of the triggering point.
• The trigger control zone on the operation panel comprises a trigger LEVEL
adjustment control, and a trigger MENU button.
• Menu button enables the trigger set up modes.
• Trigger level sets the trigger point’s vertical position on the trigger edge.
• Trigger modes: Edge, Pulse, Video and Alternate.
• Pulse width trigger is when the pulse width of the trigger signal reaches a preset
condition, trigger occurs.
• Video Trigger carries out eld or line trigger to standard video signals.
• Slope trigger condition is the signal rising or falling rate.
• When selecting edge trigger, you are triggering at the rising and falling edges of the
input signal.
Dual Time Base Function
• The dual time base function is similar
to window extension but there is a
fundamental difference In the window
extension mode you can magnify
the waveform times whereas in
the dual time base mode you can
magnify details of the waveform being
observed by thousands of times
• In effect the main time base storage depth is increased by thousands of times.
Note: The Math function is disabled in the dual time base mode.
Functions
Menu Setup Notes
Mode Main
Dual Switching between main time base and dual time base
M1 Base CH1, CH2
CH3, CH4
Switch to the waveform displayed on a different channel.
Only one channel can be displayed in the dual time base mode
X Adjust M1, M2
When M1 is the main time base, use the horizontal POSITION
and SEC/DIV controls to adjust into main time base parameters
When M2 is the main time base, use the horizontal POSITION
and SEC/DIV to adjust into main time base parameters
M2 Shift Coarse
Fine
Set delayed time base M2 to move horizontally in escalating scale
Set delayed time base M2 to move horizontally in de-escalating scale

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Pulse Trigger
• Pulse trigger means determining the triggering time based on the pulse width. You
can acquire abnormal pulse by setting the pulse width condition. Adjust using the
MULTIPURPOSE control.
Functions Menu Setup Notes
Type Edge
Signal source
selection
CH1, CH2
CH3, CH4
EXT, EXT/5
LINE
CH1 & CH2
CH3 & CH4
Set CH1, 2, 3 or CH4 as the signal source trigger signal
Set the external trigger input channel as the signal source
Set to AC power trigger
CH1 & CH2 trigger their respective signals alternately
CH3 & CH4 trigger their respective signals alternately
Grid
Alternate
Set up as grid trigger
Ch1, CH2 trigger their own signals alternatively
Inclination
Rising
Falling
Rise & Fall
Set to trigger on the signals rising edge
Set to trigger on the signals falling edge
Set to trigger on the signals rising and falling edge
Trigger Mode
Auto
Normal
Single
Set to sample waveform only if no trigger condition is
detected
Set to sample waveform only if trigger condition is satised
Set to sample waveform once when detecting one trigger
and then stop
Trigger coupling
DC
AC
H/F reject
L/F reject
Allow AC and DC quantities of the input signal to pass
Intercept DC quantities of the input signal
Reject high frequency quantities above 80kHz of the signal
Reject low frequency quantities below 80kHz of the signal
Functions Menu Setup Notes
Type Pulse
Trigger source
CH1, CH2
CH3, CH4
EXT, EXT/5
LINE
CH1 & CH2
CH3 & CH4
Set CH1, 2, 3 or CH4 as the signal source trigger signal
Set to external trigger or divide the external trigger by 5
Set to AC power source
CH1 & CH2 trigger their respective signals alternately
CH3 & CH4 trigger their respective signals alternately
Pulse width
condition
Larger
Smaller
Equal
Trigger when pulse width is larger than default value
Trigger when pulse width is smaller than default value
Trigger when pulse width equals to default value
Trigger polarity Pos pulse width
Neg pulse width
Set positive pulse as the trigger signal
Set negative pulse width as the trigger signal
Trigger mode
Auto
Normal
Single
The system automatically samples waveform data
when there is no trigger signal input. The scan baseline
is shown on the display. When the trigger signal is
generates it automatically turns to trigger scan.
The system stops acquiring data when there is no
trigger signal. When the trigger signal is generated
trigger scan occurs.
One trigger will occur when there is an input trigger
signal. Then trigger will stop.

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Video Trigger
• By selecting video trigger you can carry out eld or line trigger with NTSC or PAL
standard video signals. Default trigger coupling is DC.
Slope Trigger
• If slope trigger is selected trigger occurs when the signals rising or falling rate
meets the set condition.
Functions Menu Setup Notes
Type Video
Trigger source
CH1, CH2
CH3, CH4
EXT, EXT/5
LINE
CH1 & CH2
CH3 & CH4
Set CH1, 2, 3 or CH4 as the signal source trigger signal
Set to external trigger or divide the external trigger by 5
Set to AC power source
CH1 & CH2 trigger their respective signals alternately
CH3 & CH4 trigger their respective signals alternately
Standard PAL
NTSC
Suitable for PAL video signals
Suitable for NTSC video signals
Synchronisation
Odd Field
Even Field
All Lines
Line Num
Set the TV odd eld to synchronise with trigger
Set the TV even eld to synchronise with trigger
Set the line signal to synchronise with trigger
Set synchronized trigger on the specied line and adjust by
turning the MULTIPURPOSE control: 626 or 525 lines
Functions Menu Setup Notes
Type Video
Trigger source
CH1, CH2
CH3, CH4
EXT, EXT/5
LINE
CH1 & CH2
CH3 & CH4
Set CH1, 2, 3 or CH4 as the signal source trigger signal
Set to external trigger or divide the external trigger by 5
Set to AC power source
CH1 & CH2 trigger their respective signals alternately
CH3 & CH4 trigger their respective signals alternately
Coupling
DC
AC
H/F reject
L/F reject
Suitable for PAL video signals
Suitable for NTSC video signals
• When PAL is selected for STANDARD format and SYNCHRONISATION mode is
LINE you will see a screen display similar to this:-
• When SYNCHRONISATION mode is FIELD you will
see a screen display
similar to this:-

15
Adjusting the Holdoff time
• You can adjust the holdoff time to observe complicated waveforms. Holdoff time
means the waiting time for the trigger to be ready for use again. During this time the
oscilloscope will not trigger until the holdoff is complete.
• Follow the normal signal synchronisation procedure and select the edge, trigger
source and inclination in the trigger menu.
• Adjust the trigger level to make the waveform display as stable as possible.
• Press F1 to switch between main and extended.
• Enter the dual time base menu.
• Use the MULTIPURPOSE control to set the holdoff time between 96ns to 1.5s.
Note: Holdoff time is usually slightly shorter
than the ‘large cycle’. When observing an
RS-232 communication signal waveform it is
easier to observe if holdoff time is slightly longer
than the starting edge time of every data frame.
Functions Menu Setup Notes
Type Video
Mode
Auto
Normal
Single
The system automatically samples waveform data when
there is no trigger signal input. The scan baseline is shown
on the display. When the trigger signal is generates it
automatically turns to trigger scan.
The system stops acquiring data when there is no trigger
signal. When the trigger signal is generated trigger scan
occurs.
One trigger will occur when there is an input trigger signal.
Then trigger will stop.
Polarity Rise
Fall
Select the rising edge within the threshold for trigger
Select the falling edge within the threshold for trigger
Pulse Condition
Larger
Smaller
Equal
Trigger when signal slew rate is larger than set value
Trigger when signal slew rate is smaller than set value
Trigger when signal slew rate is equal to the set value
Set slew rate value with the MULTIPURPOSE control
Threshold
Low
High
High & Low
Set the low level value with the MULTIPURPOSE control
Set the high level value with the MULTIPURPOSE control
Set the high & low level value with the MULTIPURPOSE control
Alternate Trigger
• When alternate trigger is selected, the trigger signal will be present in two vertical
channels. This triggering mode is suitable for observing two signals of unrelated
signal frequencies
• Alternate trigger can also be used to compare pulse widths

16
Trigger Source - Trigger can be obtained from various sources: Input channel (CH1,
CH2, CH3 or CH4), external trigger (EXT, EXT/5) or line.
1. Input channel - the most common trigger source is one of the four input channels.
The selected trigger source can operate normally whether the input waveform is
displayed or not.
2. External trigger - this type of trigger source can trigger in a third channel while
acquiring data in two other channels. Both EXT and EXT/5 trigger sources use
external trigger signals from the EXT TRIG jack. EXT can use the signals directly.
You can use EXT within the trigger level range of -0.8V and +0.8V. EXT/5 divides
the trigger by 5. As a result trigger range is extended to -4V to +4V enabling the
oscilloscope to trigger at a large signal.
3. Line - this trigger mode is suitable for observing signals related to the AC grid
power source eg: the correlation between lighting equipment and power source
equipment to achieve stable synchronisation.
Trigger Mode - determines the action of the oscilloscope when there is no trigger. There
are three trigger modes - auto, normal and single.
1. Auto Trigger - samples the waveform data when there is no trigger signal input.
The scan base is shown on the display. When the trigger signal is generated it
automatically turns to trigger scan for signal synchronisation.
Note: when the time base of the scan waveform is set to 50ms/div or slower, a roll
waveform is generated.
Normal Trigger - In this mode waveforms are only sampled when triggering conditions
are met. The system stops acquiring data and waits when there is no trigger signal.
When a trigger is generated, trigger scan occurs.
2. Single Trigger - In this mode press RUN button once and the oscilloscope will wait
for trigger. When one trigger is detected, it will sample and display the acquired
waveform, then stop.
Trigger coupling - determines which quantities of the signal are transmitted to the
trigger circuit. Coupling modes are DC, AC, low frequency reject and high frequency
reject.
1. DC - allowing all quantities to pass.
2. AC - intercepting DC quantities and attenuating signals under 10Hz.
3. Low Frequency Reject - Intercepting DC quantities and attenuating low frequency
quantities under 80kHz.
4. High Frequency Reject - Attenuating high frequency quantities over 80kHz.
Pre-Trigger/Delayed Trigger - data sampled before/after triggering. The trigger position
is typically set at the horizontal centre of the screen. You are able to view ve divisions
of pre-trigger and delayed trigger information. Use the POSITION control to adjust the
horizontal shift of the waveform to see more pre-trigger information. By observing pre-
trigger data you can see the waveform before trigger occurs. You can detect the glitch
that occurs when the circuitry starts. Observing this data can help identify the cause of
this glitch.
OPERATION
Setting up the Sampling System
• The ACQUIRE button on the
control panel is the function key
for the sampling system.

17
Functions Menu Setup Notes
Acquisition Mode
Sample
Peak detect
Average
Envelop
Turn on the ordinary sampling mode
Turn on the peak detect mode
Set the average sampling and display the average number
of times
Envelop sampling
Average number
of times 2-256
Set the average number of times in multiples of 2 ie: 2, 4,
8, 16, 32, 64, 128, 256 To change the average number of
times use the MULTIPURPOSE control on the front panel.
Equivalent ON / OFF
Turn the equivalent sampling mode on or off. In this mode,
selecting alternate trigger (e.g. CH1 and CH2) as the trigger
source is disallowed
• By changing acquisition setup you can observe the
consequent changes in waveform display. If the
signal contains considerable noise, you will see this
waveform displays when average sampling is not
selected:
• When 32 time average sampling is selected you will
see this:
Note: Use Real Time Sampling to observe single
signals. In this mode the system makes full acquisition
to ll the memory. Maximum sampling rate is 2GS/s. At
a setting of 50ns or faster, the oscilloscope will automatically carry out interpolation ie:
inserting a sampling point between other sampling points.
Use Equivalent Sampling to observe high frequency cyclical signals. This is a
repeated sampling mode that allows detailed observation of repeated cyclical signals. In
the equivalent sampling mode, the horizontal resolution is 20ps higher than the real time
mode ie: 50GS/s equivalent.
Normal Mode is when the oscilloscope reconstructs the waveform by sampling signals
at regular intervals.
To avoid mixed envelope, select Peak Detect. In this mode the oscilloscope identies
the maximum and minimum values of the input signals at each sampling interval and
use these values to display the waveform. In effect, the oscilloscope can acquire and
display narrow pulse which would otherwise be omitted in the sampling mode. Noise
seems to be more signicant in this mode.
Average Mode is when the oscilloscope acquires several waveforms and take the
average value to display the nal waveform. You can use this mode to reduce random
noise.
Envelop Mode The oscilloscope acquires multi-amplitude waveforms and calculate all
sampling points that synchronize with the triggering point. The maximum and minimum
values are then displayed.

18
Setting up the Display System
• The DISPLAY button on the control
panel is the function key for the
display system.
X-Y Mode
• This mode offers two separate displays. The
rst group is CH1 and CH2, i.e. CH1 signal
input on the horizontal axis (X axis) and CH2
signal input on the vertical axis (Y axis).
• The other group is CH3 and CH4, i.e. CH3
signal input on the horizontal axis (X axis) and
CH4 signal input on the vertical axis (Y axis).
Functions Menu Setup Notes
Display type Vector
Dots
Sampling points are linked for display
Sampling points are directly displayed
Format
YT
XY
(2 groups)
Operating mode of the oscilloscope X-Y is the display mode
CH1 is X input CH2 is Y input
CH3 is X input CH4 is Y input
Persist
Auto
1s
2s
5s
Innite
Waveform on screen is refreshed at normal rate
Waveform on screen is maintained for 1 sec then refreshed
Waveform on screen is maintained for 2 secs then refreshed
Waveform on screen is maintained for 5 secs then refreshed
Waveform on screen remains on display. New data will be
added continuously until this function is disabled
Intensity 1-32 In Fast ACQ mode intensity of the waveform can
be adjusted with the multifpurpose control.
Gratitude
Full
Grid
Crosshair
Frame
Set the grid display mode of the waveform zone to full, grid,
Cross Hair or frame
• In the normal X-Y mode, you can move XY gures horizontally with the CH1 or
CH3 position control and move XY gures vertically with the CH2 or CH4 position
control. Adjust the dimension and shape of XY gures with VOLTS/DIV of the
four channels and turn the SEC/DIV control to improve the display quality of the
Lissajous gure.
• Thanks to the unique X-Y display feature, your oscilloscope can display channel
waveform and Lissajous gure concurrently.
• The oscilloscope also offers the following functions :
• Automatic measurement mode
• Cursor measurement mode
• Reference or math waveform
Note: The following functions are disabled under X-Y mode:
• Dual time base
• Horizontal position control

19
Key Points
Display Type: Vector display lls the spaces between adjacent sample points. Dots
display only the sample points.
Refresh Rate: is the number of times the digital storage oscilloscope refreshes the
waveform display per second. The refreshing speed affects the capability to observe
signal movements.
Save and Recall: pressing the
STORAGE button displays the setup
menu from where you can save or recall
waveforms and setup documents stored
in memory both internal and in USB
storage devices.
Operating procedure
• Press STORAGE to go to the type menu. There are three types to select from:
1. WAVEFORM to go to the waveform save menu.
2. SETUP to enter the setup save menu.
3. BITMAP to enter the bitmap export menu.
Note: this feature can only be recalled after connecting USB ram.
Functions Menu Setup Notes
Type Waveform Select a signal waveform displayed on screen
Signal source
CH1
CH2
CH3
CH4
Select the waveform from CH1
Select the waveform from CH2
Select the waveform from CH3
Select the waveform from CH4
Set position
and save 1~10
Set and select the position in which the waveform is saved
in the internal memory. Adjust using the multipurpose control
then press to save
Export CSV
External Go to USB menu
Functions Menu Setup Notes
Setup Select the front panel setup menu
Setup (save
position) 1~10
Maximum 10 front panel setups can be saved. Select with
the multipurpose control on front panel
Export CSV
External Go to USB menu
Save -- Save the setting
Recall -- Recall the setting
Functions Menu Setup Notes
Bitmap Select the bitmap menu
Save position 1~10
Maximum 10 position data can be saved. Select with the
multipurpose control on front panel
Export CSV
External Go to USB menu
Recall Save graphic data

20
Setting up Alternative Functions
• The UTILITY button on the control
panel is the function key for
alternative functions.
• Use the multipurpose control to choose and select settings.
Functions Menu Setup Notes
Conguration
Self Cal
Version
Erase
RTC Setup
Run auto calibration
Display model information and serial number
Clear all saved waveforms and setups
Enter date and time set up
Default Set
Auto setup
Pre 1/2
Back
Restore factory setup
Set the auto function
Return to utility menu
Preference
Language
Skin
Menu display
Brightness
Back
Select desired language
Classic, traditional, modern
Set auto shut off time 5, 10, 20 sec or manual (disabled)
Display contrast setting
Return to utility menu
Cymometer ON/OFF Displayed top RH of the screen when ON
Interface
Set GPIB and LAN for communication for optional
accessory UT-M06
Recording
waveform
SEE TABLE
BELOW
Setup for recording waveform
Functions Menu Setup Notes
n (F4)
Stop recording
u (F3)
Playback button - the system plays back and displays the
number of screens to be played. Use the multipurpose
control to select the waveform to be displayed.
l (F5)
Record button - press this then the MENU ON/OFF to
record. The number of screens is displayed. Max 100
screens of data can be recorded. Data is lost when the unit
is powered off.
Functions Menu Setup Notes
Display ON/OFF Turn on the time display. Time display is disabled when the
frequency counter is in us e
Min & hour
Press [F2] to select minute or hour, then adjust with the
multipurpose control
Day or month Press [F3] to select day or month, then adjust with the
multipurpose control
Year Press [F4] to select year then adjust with multipurpose control
OK Conrm setting and return to utility menu
Note: The Cymometer counts the frequency of trigger events of the trigger channel. It
works on edge or pulse trigger but not alternate trigger. The Cymometer is also disabled
for video trigger.