Digital Storage Oscilloscope SPO
«Sensitive Phosphor Oscilloscopes»
DOX3104
4-voies - 100 MHz - 2 GSPS - 28MPts
WaveGenerator - Serial Bus Decode
DOX3304
4-voies - 300 MHz - 2 GSPS - 28MPts
WaveGenerator - Serial Bus Decode
8-Channel Logic Analyzer
User’s Manual
Pôle Test et Mesure de CHAUVIN-ARNOUX
Analog Inputs
Digital Inputs
Arbitrary
Generator
Interactive
Menu buttons
LCD TFT 8″
800 x 480
USB
Cal. 3V
1kHz
Control Front Panel
ON/OFF
Content
2 4-Channel SPO Digital Oscilloscopes
Content
General Instructions
Introduction .............................................................................. 6
Precautions and safety measures ............................................. 6
Symbols on instrument ............................................................. 7
Guarantee, Repair, Servicing .................................................... 7
Instrument Description
Front panel ............................................................................... 8
Rear panel ................................................................................ 9
User display interface ............................................................. 10
Menu and Control buttons ...................................................... 11
Front panel Inputs and Ouputs................................................ 13
Rear panel Connectors .......................................................... 13
Universal knob ........................................................................ 13
Getting Started
Function Checking .................................................................. 14
Probe ...................................................................................... 15
Probe compensation .............................................................. 16
Function Description
AUTO Config/Default Config .................................................................................................... 17
Auto Setup .............................................................................. 17
Default Configuration ............................................................. 18
I - Vertical System .................................................................................................................... 19
Channels CH1 - CH2 - CH3 - CH4 ............................................. 19
Channel configuration ............................................................ 20
Input coupling ........................................................................ 21
Bandwidth Limit ...................................................................... 21
Vertical Sensitivity .................................................................. 22
Probe Factor ........................................................................... 23
Invert function ........................................................................ 23
Input impedance ..................................................................... 24
Vertical Unit ............................................................................ 25
Vertical knobs ............................................................................................................... 26
Vertical Position knob ............................................................. 26
Vertical Sensitivity knob ......................................................... 26
Storing and Displaying Reference waveforms ............................................................... 27
REF Menu ............................................................................... 27
Mathematical Funstions ................................................................................................ 28
MATH Menu ............................................................................ 28
Mathematical operations ..................................................... 28
Fast Fourier Transform FFT .................................................... 29
FFT Menu ............................................................................ 29
How to use the FFT ............................................................. 29
Displaying the FFT spectrum .............................................. 30
Selecting the FFT window ................................................... 31
FFT : Vertical and Horizontal scales .................................. 32
Vertical and Horizontal Position .......................................... 32
Cursors Measurements ....................................................... 32
Amplitude .......................................................................... 32
Frequency .......................................................................... 33
FFT of « Cal 3V 1kHz » signal ............................................. 34
Content
4-Channel SPO Digital Oscilloscopes 3
II - HORIZONTAL System ......................................................................................................... 35
Horizontal menu ..................................................................... 35
HORIZONTAL Pad ................................................................... 36
Horizontal Position ................................................................ 37
Time Base Coefficient S/div ................................................... 37
Horizontal Zoom .................................................................... 37
III - TRIGGER System ............................................................................................................... 38
Trigger Menu .......................................................................... 38
Tigger Source ......................................................................... 39
Trigger Type ........................................................................... 40
Edge .................................................................................. 40
Pulse ................................................................................. 41
Video ................................................................................ 43
Slope .................................................................................. 44
Window ............................................................................... 46
Interval ............................................................................... 47
DropOut .............................................................................. 48
Runt .................................................................................... 49
Pattern ................................................................................ 50
Serial 1-2 ............................................................................ 53
I2C ................................................................................... 53
SPI ................................................................................... 54
UART/RS232 .................................................................... 55
CAN ................................................................................. 56
LIN ................................................................................... 57
Trigger Coupling .................................................................... 58
Horizontal Position ................................................................. 58
Slope&Level ........................................................................... 58
Holdoff .................................................................................... 59
IV - ACQUISITION System ........................................................................................................ 61
Acquisition menu .................................................................... 61
Acquisition Configuration ................................................ 62
Acquisition modes .................................................................. 63
Normal ................................................................................ 63
Peak detect ........................................................................ 63
Average ............................................................................. 64
High Res ............................................................................ 64
Sequence ............................................................................ 65
Memory Depth setting ......................................................... 67
Time Base ............................................................................... 68
Under-Sampling - Aliasing ...................................................... 68
Sequence Mode ...................................................................... 70
Run/Stop, Single, Auto, Normal ............................................... 71
Content
4 4-Channel SPO Digital Oscilloscopes
Content (cont’d)
V - Display System .................................................................................................................. 72
Display ................................................................................... 72
SPO : Color ON - Color Off ...................................................... 73
X-Y Format .............................................................................. 75
VI - Measurement System ........................................................................................................ 77
Scale measurements ............................................................... 78
Cursors measurement ............................................................ 77
Manual Cursors .......................... 77
Track Mode .......................... 79
Automatic measurements ....................................................... 81
Automatic Measurements menu .......................... 81
Voltage Measurements .......................... 81
Time Measurements .......................... 81
Delay Measurements ......................... 81
All Measurements .......................... 82
Measurement Types .......................... 83
VII - SAVE/RECALL System ..................................................................................................... 87
Save/Recall ........................................................................... 87
Saving Setup files in Internal
and External memory ......................... 89
Recall a Setup file ......................... 90
Rename a Setup file .......................... 91
Delete » a Setup file .......................... 91
Save/Recall Waveforms ......................................................... 92
Save/Recall Picture ............................................................... 95
Save .CSV file ....................................................................... 96
Recall Default Setup .............................................................. 98
VIII - UTILITY System ............................................................................................................. 101
Utility Menu ........................................................................... 101
Utility page 1/3 ................................................................... 102
Utility page 2/3 ................................................................... 103
Utility page 3/3 ................................................................... 105
System Status ...................................................................... 107
Language ............................................................................. 107
Print ...................................................................................... 108
Do Self Cal ........................................................................... 111
Do Self Test ......................................................................... 111
Screen Test ....................................................................... 111
Keyboard Test ................................................................... 112
LED Test .................................................................................... 112
Firmware Update .................................................................. 113
Pass/Fail .............................................................................. 113
History ................................................................................. 119
Options .......................................................................................... 122
Date/Time ............................................................................. 124
I/O ......................................................................................... 125
Content
4-Channel SPO Digital Oscilloscopes 5
IX - Arbitrary Waveform Generator ............................................................................................. 126
Creating an arbitrary waveform with EasyWave ..................... 126
Auto-Calibrating the arbitrary waveform generator ............... 129
X - DECODE option for Decoding Serial Bus .............................................................................. 130
I2C serial bus ....................................................................... 130
Setting I2C Trigger .............................................................. 131
Decoding I2C ...................................................................... 134
Reading I2C decoding ......................................................... 135
SPI serial bus ....................................................................... 136
Setting SPI Trigger .............................................................. 138
Decoding SPI ...................................................................... 139
Reading SPI decoding ......................................................... 140
UART/RS232 serial bus ........................................................ 141
Setting UART/RS232 Trigger ............................................... 142
Decoding UART/RS232 ....................................................... 144
Reading UART/RS232 decoding .......................................... 145
CAN serial bus .................................................................... 146
Setting CAN Trigger ............................................................ 151
Decoding CAN .................................................................... 157
Reading CAN decoding ....................................................... 158
LIN serial bus ....................................................................... 157
Setting LIN Trigger ............................................................. 158
Decoding LIN ...................................................................... 159
Reading LIN decoding ......................................................... 160
XI - DIGITAL Option Logic Analyzer…………………………………………………………………………160
XII - Power Analysis Option.............…………………………………………………………………………167
XIII - Remote Control .......................…………………………………………………………………………172
Messages ...................................................................................................................................... 178
Help ..................................................................................... 178
Messages ............................................................................. 179
Diagnostic ............................................................................ 180
Technical Specifications ................................................................................................................ 181
Appendix ...................................................................................................................................... 188
General Instructions
6 4-Channel SPO Digital Oscilloscopes
General Instructions
Introduction
You have just acquired a 4-channel SPO Digital oscilloscope:
DOX3104, 4-channel, 100 MHz, 2 GSPS, 28Mpts, Arbitrary Waveform Generator,
Serial Bus Decode or
DOX3304, 4-channel, 300 MHz, 2 GSPS, 28 Mpts, Arbitrary Waveform Generator,
Serial Bus Decode, 8-channel Logic Analyzer.
This 2-4-channel oscilloscope provides a set of powerful features for a wide range of
applications such as production, education, maintenance, service, research and
development.
Congratulations for your choice and thank you for your trust in the quality of our
products.
This instrument conforms to safety standard NF EN 61010-1, single insulation, and
relative to electronic measurement instruments. This is a class 1 device which must be
connected to the protective earth by its power cord.
To obtain optimum service, read these instructions with care and comply with the
precautions for use.
Failure to comply with these warnings and/or user instructions is liable to cause damage
to equipment to the equipment and/or components. This could be dangerous to the user.
Précautions
and
safety
measures
This instrument has been designed for use:
- indoors,
- in a pollution degree 2 environment,
- at an altitude of less than 2000 m,
- at a temperature in the range of 0°C to 40°C
- at a relative humidity below 80 % up to 31°C.
It can be used for measurements on 300V CAT I circuits and can be powered by a
300V CAT II network.
Définition of
installation
categories
Overvoltage Category l : Is applicable to instruments and equipment which are not
intended to be connected to the mains supply. Because the available energy is very
limited this category is normally not marked on the equipment. CAT I is for connection to
circuits in which measures are taken to limit transient over-voltages to an appropriately
low level. Examples: Protected electronic circuits.
Overvoltage Category ll : is for equipment intended to be supplied from building wiring.
It applies to both equipments plug-connected or permanently connected.
E.g.:Measurements on the network circuits of household appliances, portables tools and
other similar appliances.
Overvoltage Category lll : is for equipment intended to be incorporated into the building
wiring. Such equipment includes socket outlets, fuse panels, and some mains installation
control equipment. E.g.: Measurements on distribution panels (including secondary
meters) circuits breakers, cabling including cables, busbars, junction boxes,
disconnecting switches, power outlets in the fixed installation, and industrial appliances
and other equipment, such as motors permanently connected to the fixed installation.
La catégorie de surtension lV : is for equipment installed at or near the origin of
electrical supply to a building, between the building entrance and the main distribution
board. Such equipment may include electricity tariff meters and primary overcurrent
protection devices. E.g.: Measurements on systems installed before the main fuse or the
circuit breaker of the building’s installation.
before use
Comply with environment and storage conditions.
during use
Read carefully all the notes preceded by the symbol .
Connect the instrument to an outlet with a protective ground pin.
Be sure not to obstruct the aeration points.
As a safety measure, use only suitable cords and accessories supplied with the
instrument or type approved by the manufacturer.
When the instrument is connected to the measurement circuits, never touch an
unused terminal.
General Instructions
4-Channel SPO Digital Oscilloscopes 7
General Instructions (cont’d)
Symbols on
instrument
Warning: Risk of danger.
Refer to the operating manual to find out the nature of the potential hazards
and the action necessary to avoid such hazards.
Selective sorting of waste for recycling electric and electronic materials.
In accordance with the WEEE 2002/96/CE directive: must not be treated as
household waste.
Earth symbol
On/Off switch
LAN symbol
USB symbol
Fuse symbol
European Conformity
Hazardous voltage
Alternative Current
Guarantee
This equipment is guaranteed for 3 years against any material defect or manufacturing
faults, in conformity with the general conditions of sale.
During this period, only the manufacturer may repair the equipment and it reserves the
rigth to carry out repair or replacement of all or part of the equipment. If the equipment
is returned to the manufacturer, forward transport is at the expense of the customer.
The guarantee does not apply in the event of :
Improper use of the equipment or by association with incompatible equipment
Modification of the equipment without the explicit authorization of the manufacturer
technical services
Equipment repaired by a person not authorized by the manufacturer
Equipment used in a particular application not suitable for the device or not described
in the user manual
Shock, fall or flooding.
Repair
For repairs under or out off warranty, please contact our nearest « CHAUVINARNOUX » sales office or our “ MANUMESURE” regional technical center , which will
establish a feedback file and will communicate the procedure to be followed.
Contact information on our website : http://www.chauvin-arnoux.com or by phone at the
following numbers:
02 31 64 51 43 (MANUMESURE Technical Center)
01 44 85 44 85 (Chauvin Arnoux).
For repairs outside metropolitan France, return the instrument to our “Chauvin-Arnoux”
local agency or distributor.
Servicing
Turn the instrument off.
Clean it with a damp cloth and soap.
Never use abrasive products or solvents.
Dry it before any further use.
Instrument Description
8 4-Channel SPO Digital Oscilloscopes
Instrument Description
Front Panel
No.
Description
No.
Description
1
Universal Knob
12
Trigger Control
2
Horizontal Controls
13
Common Functions Keys
3
Auto Setup
14
Vertical Controls
4
« Default » Configuration
15
Six menu buttons
5
Run/Stop
16
«Up » Menu button
6
Generator set button « Wave
Gen »
17
On/Off button
7
« DECODE » set button
18
Analog Inputs BNCs
8
« Digital » set button
19
Logic Analyzer Inputs
9
« Math » set button
20
« USB Host » connector
10
« Ref» set button
21
Probe Adjust Output
11
Vertical Controls for
(Decode/Digital/Math/Ref）
22
Arbitrary Waveform Generator Output
17 18 19 20 21 22
1 2 3 4 5 6 7
7
8
11
9
10
14
Instrument Description
4-Channel SPO Digital Oscilloscopes 9
Instrument Description (cont’d)
Rear Panel
1. Handle
To transport the oscilloscope turn the handle uprigth.
2. EXT TRIG
External trig input BNC “EXT TRIG”.
3. « PASS/FAIL » output or trigger output « TRIG OUT » :
The oscilloscope delivers either a square signal whose frequency is the number of waveforms
acquired per second (Aux Output=Trig Out) or the number of “Fail” tests (Aux Output = Pass/Fail).
4. LAN
RJ45 connector for a remote control of the oscilloscope (VXI11).
5. USB Device
USB connector for « PictBridge » printer (printer) or PC control (USBTMC).
6. Kensington Lock
The Kensington cable is not supplied with the unit
7. Power cord connector
The supply voltage range is 100-240 Vac, 45-440 Hz. Use the power cord supplied with the unit.
8. Fuse
Slow blow fuse 5x20mm 250V, 1.25A.
Instrument Description
10 4-Channel SPO Digital Oscilloscopes
Instrument Description (cont’d)
User
display
interface
1.
Trigger status:
Arm: The oscilloscope is acquiring pre-trigger data. All triggers are ignored in this state.
Ready: All pre-trigger data has been acquired and the oscilloscope is ready to accept a trigger event.
Trig’d: The oscilloscope has detected a trigger event and is acquiring the post-trigger data.
Stop: The oscilloscope has stopped acquiring waveform data.
Auto: In trigger « Auto » mode, the oscilloscope refreshes the trace even in absence of a trigger event.
2.
Time Base coefficient : S/div.
3.
Indicates the horizontal trigger position relative to the screen center, use the horizontal Position knob to
adjust it.
4.
“Zoom” Time Base coefficient : S/div
5.
Awg : High-Z Arbitrary waveform Generator output impedance: High-Z or 50Ω
6.
USB flash plugged-in
7.
Indicates whether the back USB option is set to : Computer or Printer
“back USB ” option is set to “Computer”
“back USB” option is set to “Printer”
8.
Shows the Channel vertical position symbol
9.
Shows the CHi active Menu (CH 1)
10.
Input Coupling symbol
11.
Indicates whether the bandwidth limit is « 20MHz » or « Full Bandwidth».
12.
Vertical Scale Adjust : « Coarse » or « Fine »
13.
Probe Factor Selection : .1X .2X .5X 10X 20X 50X 100X 200X 500X 1000X 2000X 5000X 10000X
14.
Input impedance : 1MΩ - 50Ω
15.
Next page Menu CHi (CANAL i)
16.
Display for each of the active channels:
Channel number, Probe factor, Input Impedance, « B » for the 20MHz bandwidth limit if enabled, Input
Coupling, Vertical Sensitivity V/div
17.
Indicates the trigger type, the trigger source, the trigger slope, the trigger coupling and the trigger level
in Volt.
18.
Indicates the sample rate and the current memory depth.
19.
Indicates the frequency of the trigger source signal (hardware counter)
1 2 3 4 5 6 7
8
9
19
18
17
16
20
10 11 12 13 14 15
Instrument Description
4-Channel SPO Digital Oscilloscopes 11
20.
Indicates the date and time
Instrument Description (cont’d)
Menu and
Control
buttons and
knobs
Channel
buttons
CH1, CH2,
CH3, CH4
Press the CH1 (or CH2 or CH3 or CH4) button to enable (ON) or disable (OFF) the
channel and to open the CHi configuration menu. When the channel is “On” the button is
lit.
Run/Stop
Run : The traces are refreshed continuously, Stop: acquisition is Stopped.
Note: In « Stop », use the S/div knob to zoom or compress the trace.
Auto Setup
Automatically sets the oscilloscope controls to produce a suitable display of the input
signals.
Wave Gen
Press this button to enable the « Arbitrary Waveform Generator »
Horizontal
Control
Trigger Control
Common Menu
buttons
Vertical
Control
Advanced
Functions
Arbitrary
Generator
Submenu
buttons
Instrument Description
12 4-Channel SPO Digital Oscilloscopes
Default
Press this button to reset the oscilloscope settings to the « Default » configuration
Decode
Press this button to enable and configure the serial bus « Decode » option
Math
Press this button to enable and configure the « MATH » function.
Digital
Press this button to enable and configure the 8 channel « Digital » bus option
Ref
Press this button to open the REF WAVE menu. Use this menu to Save or Recall
reference waveforms (REFA REFB REFC REFD) in the internal memory. When a
reference waveform is displayed the “Ref” button is lit.
Horiz
Press this button to open the horizontal menu to select the horizontal format : YT, XY or
Roll.
Setup TRIG
Press this button to open the TRIGGER menu to select the trigger type : Edge, Slope,
Pulse, Video, Window, Interval, DropOut, Runt, Pattern, Serial1, Serial 2 and to
configure it.
50%
Push the « Level » knob to obtain a stable trace. The oscilloscope automatically sets
the trigger level to be halfway between the minimum and maximum voltage level of the
trigger source signal. This is particularly useful when the trigger source is a “non
displayed” signal like “EXT TRIG”.
« Auto »
Press this button to enable the Auto mode. In this mode the traces are refreshed in the
presence or absence of a trigger event.
Normal
Press this button to enable the Normal mode. In this mode the traces are refreshed only
in the presence of a trigger event.
Single
Press this button to enable the « Single » mode trigger. In this mode the oscilloscope
performs a single acquisition and then « STOP ».
Utility
Press this button to open the « Utility » menu. The utility menu allows to configure the
oscilloscope options such as: Sound, Language, Printer, Date/Hour etc. The Utility menu
allows to display the « System Status » and to update the firmware.
Display
Press this button to open the « Display » menu. The display menu allows to configure
the display Type, Color, Grid, Persistence, Intensity, Brightness, etc..
Cursors
Press this button to open the « CURSORS » menu. Use the « Universal » knob to
position the active cursor. The sliders are displayed after leaving the « CURSORS »
menu (exept if mode = Off) but can not be adjusted.
Help
Press this button to open the access to the internal Help.
Print
Press this button to open the « Print » menu. The back USB connector must be set on
« Printer ».
Measure
Press this button to open the « MEASURE » menu.
Acquire
Press this button to open the « Acquire » menu. The Acquire menu allows to configure
the sampling mode : Normal, Peak Detect, Average, High Resolution.
Save /
Recall
Press this button to open the « Save/Recall » menu. This menu allows to Save (or
Recall) “Setups” in the internal or external memory and “Pictures”, “Waveforms”, “CSV
files” in external memory.
Soft Keys
Six soft keys and the « Up » key provide access to submenus.
Instrument Description
4-Channel SPO Digital Oscilloscopes 13
Instrument Description (cont’d)
Input BNCs , Logic
Analyzer Probe
Connector, USB host,
Probe adjust Output,
Arbitrary Waveform
Generator Output BNC
Channel input BNC :
CH1, CH2, CH3, CH4
4 BNCs connectors for input signals.
Logic Analyzer
8-channel logic analyzer input connector
USB A
USB host connector
Cal Probe Adjust
Output
The « Cal » Output allows compensation of 1/10 attenuating probes.
Arbitrary Waveform
Generator Output
Arbitrary Waveform Generator BNC output
Rear Panel Connectors
2 BNCs
USB
Device
LAN
Main
Supply
Socket
1 Aux Output BNC :« PASS/FAIL OUT » or « TRIG OUT »
according to setting
1 « EXT TRIG » BNC: External Trig Input
USB type B Connector : to connect the oscilloscope to a PC or
to a « Pictbridge » printer
RJ45 Connector : to connect the oscilloscope to Ethernet LAN
Main Supply Input Connector
Universal Knob
You can use it with many functions, such as adjusting the
holdoff time, moving cursors, setting the pulse width, setting the
video line, adjusting X and Y masks when using the pass/fail
function etc. The “Universal” knob allows to adjust the storage
location of setups, waveforms, pictures when saving/recalling
and to select menu options. When the “Universal” button is
active the “Select LED” is lit.
Input BNCs
Logic Analyzer
USB A
Cal
AWG out
On/Off
Getting started
14 4-Channel SPO Digital Oscilloscopes
Getting started
Verification of
instrument
operation
To check the operation of the oscilloscope, perform the following steps:
Steps
1. Turn on the oscilloscope.
Press the « Default » button of the « RUN CONTROL » pad to load the
« default » configuration of the oscilloscope. Note : The default value for the
attenuation compensation coefficient of the probe is 1X.
2. Switch the attenuation of the “probe” to the « 1X » position, plug it on CH1
and turn clockwise to block. Connect the probe tip and the ground alligator clip
to the terminals “Cal 3V 1kHz” and “Ground” of the probe adjust output.
3. Press the "Auto Setup" button to display the “3Vpp, 1kHz” Cal square wave.
4. Press the "CH1" button to disable CH1. Then press the "CH2" button to
enable CH2 and repeat steps 2 and 3 to display the Cal signal on CH2.
Repeat the previous steps with the channels CH3 and CH4.
Cal Output : 3V 1kHz
GND
CH1 channel
« Default Setup »
Getting started
4-Channel SPO Digital Oscilloscopes 15
Getting started (cont’d)
Oscilloscope
Probe
A guard around the probe body protects fingers from electric shocks.
Before performing a measurement :
Plug the probe in the “BNC” input of the oscilloscope and then connect the
alligator clip of the probe to the ground reference potential of the circuit under
test.
Probe
Attenuation
The probes can have different attenuation factors that affect the vertical scale of
the oscilloscope. Press the corresponding channel button (CH 1 or CH2 or CH3
or CH4), and select the factor that matches the attenuation factor of your probe.
Be sure that the attenuation switch on the probe matches the probe factor in the
oscilloscope. The probes supplied with the oscilloscope have two attenuation
coefficients : X1 et X10.
Note:
● To avoid electric shock when using the probe, keep fingers
behind the probe guard.
● To avoid electric shock when using the probe, do not touch the
metal parts of the head of the probe when it is connected to a
voltage source. Connect the probe to the oscilloscope input and
then connect the probe ground lead to the ground reference of
the “circuit under test “before performing any measurement.
Note : The default value of the probe factor is 1X.
Note :
When the attenuation switch is in the X1 position, the probe
limits the bandwidth of the oscilloscope to about 6MHz
(depending on the characteristics of the probe ). To use the full
bandwidth of the oscilloscope, be sure that the position of the
probe switch is set to X10.
Getting started
16 4-Channel SPO Digital Oscilloscopes
Getting Started (cont’d)
Probe Adjust
Warning : The DOX3000 series have a switchable input impedance: 1MΩ -
50Ω. When using a « 1/10 » probe of 10MΩ input impedance (= 9MΩ for the
probe + 1MΩ oscilloscope input) it is imperative to set the oscilloscope input
impedance to 1MΩ. If we visualize the « Cal 3V 1kHz » signal with a 1/10
probe and the oscilloscope input impedance is set to 50Ω, we will see on the
screen a near zero amplitude signal because instead of having an
attenuation of 1/10, we have an attenuation of 1/180000 (50/9000050).
Manual method of compensating the frequency response of a « 1/10 » probe
connected to one channel of the oscilloscope.
Operation Steps
1. Open the CH1 menu and set the Probe attenuation factor to 10X and the
oscilloscope input impedance to 1MΩ. Set the probe switch to X10 and
connect the probe to CH1. If you use the probe hook-tip, insure a proper
connection by firmly inserting the tip onto the probe.
2. Attach the probe tip to the “Cal 3V 1kHz” output and the reference lead to
the GND connector.
Set CH1 « On » (button lit) and then press the "Auto Setup" button.
3. Check the shape of the displayed waveform :
Over Compensated Under
Compensated Correctly Compensated
4. If necessary, adjust the probe variable capacitor with the supplied
screwdriver to get a « Correctly Compensated » signal. Repeat when you
connect the probe to a different channel or when using another probe.
Note : For more information consult the manual of the probes supplied with
the oscilloscope.
Functional Description
4-Channel SPO Digital Oscilloscopes 17
Functional Description
AUTO SETUP
Auto Setup
« Auto Setup » button on « RUN CONTROL” block
DOX3000 digital oscilloscopes have an « Auto Setup » function that
configures automatically the device to produce a display adapted to the
signals at the channel inputs.
After launching an “Auto Setup”, select, if necessary, the type of signal
displayed among the four proposed : Several periods, One period, Rising or
Falling edge at the center of the screen.
Auto Setup
Function
Option
Description
Multi-cycle
Autoset and displays several cycle signal.
Single-cycle
Autoset and displays single cycle signal.
Rising edge
Autoset and displays the Rising edge.
Falling edge
Autoset and displays the Falling edge.
Undo config.
The oscilloscope recalls the previous
Setup.
The “Auto Setup” sets the trigger source and displays the channels according
to the following criteria :
● If multiple channels have an input signal, channel with the lowest frequency
signal has the priority.
● If no channel is « On » and no signal is found, no channels are displayed.
● If one or more channels are « On » and no signal is found, only the « On »
channels remains active.
Functional Description
18 4-Channel SPO Digital Oscilloscopes
Functional Description
AUTO SETUP (cont’d)
« Auto setup »
function
Function
Value
Sampling Mode
unchanged
Display Format
Y-T
Display Type
Vectors
Input Coupling
AC
Bandwidth limit
Unchanged
V/div
Set
V/div adjust
Coarse (séquence 1 2 5)
Invert Signal
unchanged
Horizontal Position
Centered
S/div
Set
Trigger Type
Edge
Trigger Source
Auto detection of the signals on the input channels
and selection of the proper trigger source.
Trigger Slope
Rising
Trigger Mode
Auto
Trigger Coupling
DC
Holdoff
unchanged
Trigger Level
Adjusted to 50%
« Default » Setup
The oscilloscope is set up for normal operation when it is shipped from the
factory. This is the « Default Setup ». To recall this setup, press the
« Default » button. Settings may change for options, buttons and controls
when you press the « Default » button, refer to appendix B.
The « Default » setup does not change the following settings :
● Language option
● Saved reference waveform files
● Saved setup files
● Display settings
● Calibration data
Functional Description
4-Channel SPO Digital Oscilloscopes 19
Functional Description
I - VERTICAL System
Vertical knobs and buttons allow to display waveforms and to modify sensitivity and
vertical position.
Channels: CH1
CH2 CH3 CH4
page 1
Option
Value
Description
Coupling
DC
AC
GND
DC: passes the AC and DC components of the
input signal.
AC: blocks the DC component of the input signal
and attenuates AC components below 10Hz.
GND: disconnects the input signal.
Bandwidth
limit
ON
OFF
Limits the channel bandwidth to 20 MHz and
reduces high frequency noise.
Full bandwidth
Volts/Div
Coarse
Fine
Selects the resolution of the Volts/div knob :
« Coarse » : defines a 1-2-5 sequence.
« Fine » : small steps continuous adjustement.
Probe
.1x, .2x, .5x,1x ,
5x, 10x, 20x,
50x,100x, 200x,
500x, 1000x,
2000x,
5000x,10000x
Set to match the attenuation of the probe you are
using to ensure correct vertical readouts.
Input
Impedance
1MΩ
50Ω
Selects the channel input impedance.
« 1MΩ » : for use with 10MΩ input impedance
«1/10» probes.
« 50Ω » : for use with 50Ω cable and 50Ω output
impedance Generator to preserve impedance
matching which is necessary when working with
high frequency signals.
Next Page
Page 1/2
To access page 2/2
page 2
Option
Values
Description
Unit
V
A
Vertical unit : Volts or
Ampères.
Invert
ON
OFF
To invert the channel.
To disable inversion.
Next Page
Page 2/2
To access page 1/2.
CH1 CH2 CH3 CH4
buttons to open vertical
menu and set channels
“on”
CH1 CH2 CH3 CH4
« Volt/div » knobs
CH1 CH2 CH3 CH4
Vertical « Position » knobs
Functional Description
20 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System (cont’d)
Setting up:
CH1,CH2,
CH3, CH4
channels
Press the CH1 (CH2, CH3 or CH4) button to open the corresponding channel
menu.
Selecting the
channel Input
Coupling
● Pressing “CH1” → “Coupling”→ “AC”, Set to AC the CH1 input coupling:
The DC component of input signal is blocked.
● Pressing “CH1”→ “Coupling”→ “DC”, Set to DC the CH1 input coupling:
Both DC and AC components of input signal pass.
● Pressing “CH1”→ “Coupling”→ “GND”, Set the input coupling to GROUND :
The input signal is disconnected.
The CH1 input signal is a positive square wave displayed with DC input coupling:
Proceed similarly to select the input coupling of CH2 - CH3 - CH4
Bandwidth
Limit
● Pressing “CH1”→“BW Limit”→ “20M” to enable the channel “Bandwidth Limit”.
The sinusoïdal signals (F> 20MHz ) are attenuated.
● Pressing “CH1”→ “BW Limit”→ “Off” disable the channel “Bandwidth Limit” :
The channel has « full » bandwidth.
DC Input
Coupling
Positive square wave
« 20M » channel BW limited to 20MHz
Functional Description
4-Channel SPO Digital Oscilloscopes 21
Injecting a “<1ns” rise time “1MHz” square wave on channels CH1 and CH2 .
The picture below shows a “1MHz” square wave displayed with the bandwidth limit
"20M" on CH2 and with the “full” bandwidth on CH1:
The measured rise time is 1.8ns on CH1 and 17.20ns on CH2, the presence of the
« bandwidth limit » on CH2 leads to a slower rise time.
Functional Description
22 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System (cont’d)
Adjusting
vertical
sensitivity V/div
Vertical scale adjusting has « Coarse » and « Fine » mode, vertical sensitivity
range is 2mV/div to 10V/div.
For example, for CH1:
● Pressing “CH1”→ “Volts/Div”→ “Coarse” sets “V/div” adjust to “coarse”
default value.
Vertical sensitivity can be adjusted in a 1-2-5 sequence from 2mV/div, 5mV/div,
10mV/div to 10V/div.
● Pressing “CH1”→“Volts/Div”→ “Fine” sets “V/div” adjust to “fine” This
setting allows a continuous adjustement of the vertical sensitivity between
coarse steps.
Note : Pressing the vertical sensitivity button also toggles the setting from
« Coarse » to « Fine ».
For example : Use the « Fine » vertical sensitivity adjust to determine the channel
bandwidth when the bandwidth limit is « On »:
1° Set the bandwidth limit to 20MHz on CH2 and “Full” bandwidth on CH1
2° Inject on CH1 and CH2 the same “300mVpp, 1kHz” sinusoïdal signal
3° Adjust the CH1 vertical sensitivity to 50mV/div (coarse) and CH2 (Fine) to
35mV/div (35mV= 0.7x50mV).
Fine adjust
sensitivity
Bandwidth Limit
« 20M » on CH2
21.6MHz
50mV/div
35mV/div
Functional Description
4-Channel SPO Digital Oscilloscopes 23
4° Increase the frequency of the generator to obtain a « 6 divisions amplitude »
signal on both channels, the frequency measured by the oscilloscope (21.6MHz
in our example) is the CH2 cutoff frequency with the bandwidth limit to 20M.
Probe
attenuation
factor
In the CHi menu, select the probe « factor » that matches the attenuation
coefficient of the probe used.
To compensate an attenuation coefficient of 1/10, the probe factor must be set to
10X to integrate the attenuation coefficient of the probe in the vertical sensitivity.
For example if you are using a « 1/100 » probe, the probe factor must be set
to 100X :
● Press “CH1”→ “Probe” → and select the “100X” factor
● Then the vertical sensitivity range will cover : 200mV/div to 1kV/div
Probe Factor “100X”
to compensate a
“1/100” probe
Maximum
sensitivity
1kV/div
Functional Description
24 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System (cont’d)
Inverting
Waveforms
For example, on CH1:
● Press “CH1”→ ″Page Suiv″ (″Next Page“) ″page 2/2” →“Invert”→“On”:
We show below, the same positive square wave on CH1 with invert « On » and on
CH2 with invert « Off »
Input
Impedance
● Press “CH1”→ «Impedance »→ and select the channel input impedance
« 1MΩ » or « 50Ω ».
● 1MΩ input impedance is necessary when using 1/10 probes:
The “1MΩ” impedance allows to compensate the « 1/10 » probes by adjusting its
variable capacitor :« 9MΩ//Var. Cap ».
The « 1MΩ » impedance is particularly well suited to « low frequency » and “high
voltage” signals.
● « 50Ω » impedance : for use with 50Ω cable and 50Ω output impedance Generators
to preserve impedance matching .
“50Ω » impedance is particularly well suited to « High Frequency » and « Low
voltage » signals.
● In the example below we show a fast rising edge (<1ns) square wave on CH1 with
an impedance of 50Ω and 1MΩ
1° CH1 input impedance « 50Ω » :
Functional Description
4-Channel SPO Digital Oscilloscopes 25
The rise time = 1.5ns and the amplitude = 286mV
2° CH1 input impedance « 1MΩ » :
The rise time = 2.2ns and the amplitude = 576mV (twice that obtain with « 50Ω »)
Conclusion : The « 50Ω » input impedance is best suited to observe fast rising edge
waves provided by 50Ω output impedance generators.
Vertical Unit
V ou A
● Press “CH1”→ “Next Page page2/2”→ “Unit” → and select the vertical unit :
Volt or Ampere.
Functional Description
26 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System (cont’d)
2. Vertical Knobs
Vertical Position
knobs
1. Use the vertical "Position" knobs to move traces up and down the screen.
The vertical position variation range is :
+ /- 1V for vertical sensitivities from 2mV/div to 100mV/div
+/- 10V for vertical sensitivities from 102mV/div to 1V/div
+/- 100V for vertical sensitivities from 1.02V/div to 10V/div
2. While you adjust the trace vertical position the ″Volts Pos=″ value is
displayed on the screen.
3. Push the vertical “Position” knob to set the vertical position to zero
(= screen center).
Vertical
Sensitivity
Volts/div
1. Use the “Volt/div” knob to adjust the vertical sensitivity. When you turn
clockwise or counter-clockwise the sensitivity increases or decreases.
2. Push the “Volt/div” knob, to toogle between Coarse and Fine adjust.
″Coarse″ Vertical sensitivity can be adjusted in a 1-2-5 sequence from
2mV/div, 5mV/div, 10mV/div to 10V/div (12 steps).
″Fine″ a continuous adjustement of the vertical sensitivity from 2mV/div to
10V/div.
3. Save and Recall
Reference Waveform
The REF menu allows to save (or recall) reference waveforms in four internal
memorie locations : REFA - REFB - REFC and REFD.
Press the « Ref » button to open the REF menu :
Functional Description
4-Channel SPO Digital Oscilloscopes 27
REF Menu
Option
Value
Description
Source
CH1 CH2
CH3 CH4
Math
Select the waveform to save
REFA REFB
REFC REFD
Select the REF memory location.
Save
Save the waveform in the selected memory
location
REFA/REFB/
REFC/REFD
On
Off
Recall and Display the selected REF.
Clear the displayed REF waveform.
Operation Steps
1. Press the "Ref″ button to open the REF menu.
2. Press the "Source” button to select the reference source : CH1 or CH2 or
CH3 or CH4 or Math.
3. Use the “Position” and “V/div” knobs to set the vertical position and the
sensitivity to the proper values.
4. Press the ″REF A″ (or REF B or REFC or REFD) button to select the REF
memory location.
5. Press the « Save » button to save the REF waveform.
6. Select REF A (ou REF B ou REFC ou REFD) Display ″ON″ to display the REF
waveform
The reference trace is dispayed in blue color.
Functional Description
28 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System / MATH Functions
Menu MATH
The « MATH » menu displays the results of mathematicals operations: +, -, *, /,
FFT, d/dt, ∫dt and √ on channels CH1, CH2, CH3, CH4 and REFA, REFB, REFC,
REFD waveforms.
Press the « Math » button to open the MATH menu.
MATH Menu
Fonction
Value
Description
Operation
+, -, *, FFT, d/dt, ∫dt and
√
Select the mathematical function.
Source A
Source B
CH1, CH2, CH3, CH4,
REFA, REFB, REFC,
REFD
Select the Math source
Invert
On
Off
Invert the MATH waveform.
“Invert” is disable.
Vertical
Position
Use the vertical « Position » knob to adjust
the MATH waveform vertical position.
Vertical
Scale
Use the « Variable » knob to adjust the
MATH vertical scale.
Mathematical
operations
Opération
Value
Description
+
CHi+CHj
CHi added to CHj.
-
CHi-CHj
CHj subtracted from CHi.
*
CHi*CHj
CHi multiplied by CHj.
/
CHi/CHj
CHi divided by CHj.
FFT
Fast Fourier Transform.
d/dt
Derivative
∫dt
Integral
√
Square Root
Example of
Math function:
CH1+CH2
Functional Description
4-Channel SPO Digital Oscilloscopes 29
Functional Description
I - VERTICAL System / MATH Funtion (Cont’d)
« Fast Fourier
Transform »
The “Fast Fourier Transform « FFT » process” mathematically converts à time
domain signal into its components in the frequency domain.
Two measurements are available on the FFT spectrum : Magnitude (in Vrms or
dBVrms) and Frequency (in Hz).
Menu FFT
FFT Option
Setting
Description
Operation
FFT
Source
CH1, CH2, CH3,
CH4, REFA, REFB,
REFC, REFD
Select the FFT source channel.
Window
Hanning, Hamming
Rectangulaire
Blackman
Select the FFT window type.
FFT ZOOM
1X, 2X
5X,10X
Changes the horizontal magnification of
FFT display.
Vertical
« Scale »
Vrms, dBVrms
FFT vertical scale
FFT
« Display »
Split
Full Screen
Displays the FFT spectrum on half
screen
Displays the FFT spectrum on full screen
How to use FFT
To use the FFT Math function, select the time domain signal source Y(t):
● Press « Auto Setup» button to display the Y(t) signal and select Multi cycles.
● Push the vertical “Position” knob to reset the vertical position to zero divisions
(screen center).
● Use the horizontal “Position” knob to position the Y(t) signal portion to be
analyzed with the FFT, in the center of the screen.
The oscilloscope calculates the FFT spectrum using the center 1024 points of
the time-domain waveform.
● Turn the “V/div” knob to ensure that the entire waveform remains on the
screen.
● Turn the “S/div” knob to provide the resolution you want in the FFT spectrum.
Operation
Sequence
To display the FFT correctly:
1. Push the "Math" button.
2. Set the "Opération" option to « FFT ».
3. Press the "Source" button and select the channel "CH1" or "CH2" or "CH3"
or "CH4" or "REFA" or "REFB" or "REFC" or "REFD".
4. To comply with the Nyquist-Shanon theorem turn the "S/div" knob to adjust the
sampling rate (displayed on top rigth of the screen) at least twice the frequency
of the input signal.
5. To determine the appropriate value for the “S/div” coefficient, compare the FFT
horizontal scale to the frequency displayed by the hardware counter, on the top
rigth of the screen.
Functional Description
30 4-Channel SPO Digital Oscilloscopes
Functional Description
I - VERTICAL System / MATH Function (cont’d)
2) Displaying the
FFT Spectrum
Press the « Math » button to display the MATH menu. Use the options to select:
the Source channel, the Window, and the FFT Zoom Factor. You can display only
one FFT spectrum at a time. You can select ″Full Screen" or "Split" in the
Display option to display the waveform and its FFT spectrum on full screen, or
the waveform and the FFT on half screen at a time.
With « Split » display and « Cursors » Off, you can display simultaneously: The
entire Waveform, a Zoom portion and the FFT spectrum.
FFT Menu: Source - Window - FFT Zoom - Scale - Display
We inject on CH1 a sine wave: frequency = 21.7MHz and amplitude=896mVpp
We will use the « Hanning » window to calculate the FFT, to determine the
frequency and the amplitude of the fundamental :
Using the “X1” manual cursor we can determine the frequency (X1=21.8MHz)
of the fundamental
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