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Pôle Test et Mesure de CHAUVIN-ARNOUX
Parc des Glaisins - 6, avenue du Pré de Challes
F - 74940 ANNECY-LE-VIEUX
Tél. +33 (0)4.50.64.22.22 - Fax +33 (0)4.50.64.22.00
Copyright ©
X03726A00 - Ed. 01 - 05/11
Contents
Contents
General Instructions Chapter I
Introduction......................................................................................4
Precautions and safety measures...................................................4
Symbols used..................................................................................5
Warranty..........................................................................................5
Maintenance and metrological verification......................................6
Cleaning ..........................................................................................6
Description of the Instrument Chapter II
Preparation for use ........................................................................ 7
Operation.........................................................................................9
Views.............................................................................................10
ETHERNET network......................................................................11
Getting started Chapitre III
Driving software ........................................................................... 13
First start........................................................................................13
Start of an existing oscilloscope....................................................15
"Oscilloscope" Instrument Chapter IV
Display.......................................................................................... 16
« Oscilloscope Control » window ..................................................16
« TRIGGER» and advanced trigger..........................18
« Oscilloscope Trace » window.....................................................41
Menus
"Instrument" menu..........................48
"Vertical" menu..........................49
"Horizontal" menu..........................63
"Display" menu..........................65
"Measurement" menu..........................66
"Tools" menu (WiFi …)..........................73
"?" Help menu »..........................86
"Oscilloscope with SPO Persistence" instrument Chapter V
Selection........................................................................................87
Presentation ................................................................................. 87
Display...........................................................................................88
Menus............................................................................................90
"Recorder" Instrument Chapter VI
Presentation ..................................................................................91
Selection........................................................................................91
Display.......................................................................................... 91
Menu
"Vertical" menu........................106
"Trigger" menu........................107
"Display" menu........................110
"Measurement" menu........................111
"Tolls" menu........................112
"?" Help menu »........................113
Menu bar..........................16
Tool bar..........................16
« Vertical » box..........................17
« Horizontal » box..........................18
Control buttons..........................33
« FFT » box..........................34
"File" menu..........................42
"File" menu........................103
I - 2 Virtual digital oscilloscopes
Contents
"Harmonics Analyser" Instrument Chapter VII
Presentation............................................................................114
Selection.................................................................................114
Display ...................................................................................114
Menus
"File" menu........................117
"Horizontal" menu ......................119
The "Memory", "Tools", "Help?" menus » ......................120
Applications Chapter VIII
Display of the calibration signal..............................................121
Probe compensation...............................................................124
Automatic measurements.......................................................125
Cursor measurements............................................................126
Cursor offset measurements..................................................127
Video signal display................................................................129
Examination of a specific TV line............................................131
Automatic measurement in "Analyser" mode.........................132
Display of slow events............................................................134
Measurement in "Recorder" Mode .........................................135
ETHERNET network...............................................................137
WEB Server............................................................................138
Technical Specifications Chapter IX
"Vertical" menu ......................118
"Oscilloscope" Mode............................................................142
Vertical deviation................................................................. 142
Horizontal deviation (time base)..........................................143
Trigger circuit.......................................................................144
Acquisition chain..................................................................145
Display.................................................................................146
"Harmonic Analyser" Mode.................................................147
"Recorder" Mode..................................................................147
Communication interfaces......................................................148
Remote programming.............................................................148
General Specifications Chapter X
Environment............................................................................149
Mains power supply................................................................149
Electromagnetic compatibility.................................................149
Mechanical Specifications Chapter X
Casing ....................................................................................149
Packaging...............................................................................149
Supply Chapter XI
Accessories.............................................................................150
Index
To update the embedded software, log on to the Internet site:
www.chauvin-arnoux.com
Attention ! Before printing this notice, think of the impact on the environment.
Virtual digital oscilloscopes I - 3
General instructions
General Instructions
Introduction
You have just acquired a virtual digital oscilloscope 150 MHz without display
device :
•
4-channel MTX 1054_B (150 MHz) or _C (200 MHz) (W, if option WiFi)
•
2-channel MTX 1052_B (150 MHz) or _C (200 MHz) (W, if option WiFi)
Congratulations on your choice and thank you for your confidence in the
quality of our products. It consists of:
This instrument comes with a data acquisition and pre-processing card and
its own mains supply. It is managed by embedded flash software that can be
updated from a PC via the SCOPEin@BOX software.
This software communicates with the "host PC" via an USB, ETHERNET
interface or WiFi (optional).
This instrument has the following operating modes:
"Oscilloscope" Instrument
"Harmonics Analyser" Instrument
"Recorder" Instrument
"SPO" Analogue Persistence display
"FFT" Fast Fourier Transform representation
Precautions and safety measures
definition of
measurement
categories
This instrument complies with safety standard IEC 61010-1, single
insulation, relative to electronic measurement instruments and complies with
the EMC standards corresponding to residential and industrial
environments.
For optimum service, read this manual carefully and comply with the
operating precautions.
Failure to comply with these warnings and/or user instructions is liable to
cause damage to the equipment. This could be dangerous to the user.
• It is designed for use:
- indoors
- in an environment with pollution level 2
- at an altitude of less than 2000 m
- at a temperature between 0°C and 40°C
- with relative humidity of less than 80 % up to 31°C
It can be used for measurements on 300 V CAT II circuits in relation to earth
and can be powered by a 240 V, CAT II network
Measurement category I corresponds to measurements taken on circuits not directly
connected to the network.
Example: protected electronic circuits
Measurement category II corresponds to measurements taken on circuits directly
connected to low-voltage installations.
Example: power supply for domestic appliances and portable tools
Measurement category III corresponds to measurements on building installations.
Example: measurements on distribution panels, cabling, etc.
low-voltage installations.
Example: meters and measurement on overvoltage protection devices.
I - 4 Virtual digital oscilloscopes
General instructions
General instructions (contd.)
before use
during use
Symbols used
• Comply with environmental and storage conditions.
• Ensure the three-wire power lead - phase/neutral/earth – that comes with
the instrument is in good condition.
It complies with standard IEC 61010-1 : it should be connected to the
instrument as well as the network (variation from 90 to 264 VAC).
Read carefully all the notes preceded by the symbol .
Connect the instrument to an outlet with a ground pin.
The instrument power supply is equipped with an electronic protection
system which is reset automatically when the fault is eliminated.
Be sure not to obstruct the ventilation holes.
As a safety measure, use only suitable leads and accessories supplied
with the instrument or approved by the manufacturer.
When the instrument is connected to the measurement circuits, never
touch an unused terminal.
Warning: danger hazard, consult the operating instructions.
Selective sorting of waste for recycling electrical and electronic equipment.
In compliance with the WEEE 2002/96/CE directive:
must not be considered as household waste.
Warranty
Earth terminal
USB
European compliance
This equipment is warranted to be free of defects in materials or
workmanship, in accordance with the general terms and conditions of sale.
During this period, the manufacturer only can repair the equipment.
The manufacturer reserves the right to carry out repair or replacement of
all or part of the equipment.
In the event that the equipment is returned to the manufacturer, initial
transport costs shall be borne by the customer.
The warranty does not apply in the event of:
•
improper use of the equipment or use in connection with
incompatible equipment
•
modification of the equipment without explicit authorization from the
manufacturer’s technical services
•
repair carried out by a person not certified by the manufacturer
•
adaptation for a specific application, not included in the definition of
the equipment or the user's manual
•
an impact, a fall or a flooding.
Virtual digital oscilloscopes I - 5
General instructions
General instructions (contd.)
Maintenance, Metrologic verification
Unpacking, re-packing
Cleaning
The device includes no part that can be replaced by the operator. All
operations must be carried out by competent approved personnel.
For checks and calibrations, contact one of our accredited metrology
laboratories (information and contact details available on request), at our
Chauvin Arnoux subsidiary or the branch in your country.
All the equipment was verified mechanically and electrically before
shipping.
When you receive it, carry out a quick check to detect any damage that
may have occurred during transport.
If necessary, contact our sales department immediately and register any
legal reservations with the carrier.
In the event of reshipping, it is preferable to use the original packaging.
Indicate the reasons for the return as clearly as possible in a note attached
to the equipment.
- Turn the instrument off.
- Clean it with a damp cloth and soap.
- Never use abrasive products or solvents.
- Allow to dry before any further use.
I - 6 Virtual digital oscilloscopes
Description of the instrument
Description of the instrument
Preparation for use
Instructions before
activation
Mains power
supply
Fuse
This is a user manual for the MTX 1052 and MTX 1054.
Most screen copies are made from an MTX 1054B.
Check the good condition of the power supply cable to be connected, first
to the back of the instrument and then to a 50-60Hz power socket with an
earth link.
When lit, the LED at the back indicates that the mains voltage is correct
for the oscilloscope.
Connect the oscilloscope and the "Host PC" to the "Ethernet Network" or
directly to one another via the Ethernet twisted cable.
The oscilloscope power supply is designed for:
Type: Time delay
2.5 A
250 V
5 x 20 mm
•
a power supply that can vary from 90 to 264 VAC (nominal range
of use 100 to 240 VAC)
•
a frequency between 47 Hz and 63 Hz.
This protection fuse must only be replaced with an identical model.
Replacement must only be performed by qualified personnel.
Contact your nearest distributor.
Activation Connect the oscilloscope to the 50-60 Hz network.
Wait for about one minute before starting the
"SCOPEin@BOX" application software. Refer to the "First Installation"
instructions that come with the instrument.
Reducing
consumption
When you exit the "SCOPEin@BOX" software, the remote virtual
oscilloscope switches to reduced consumption mode (except in
"Recorder" Instrument mode). Channels are put on standby but the
microprocessor remains active.
When a new work session is opened, the oscilloscope is automatically
switched to normal consumption.
To save working parameters correctly, exit the "SCOPEin@BOX"
software before disconnecting the instrument from the 50-60 Hz network
or Ethernet network.
Virtual digital oscilloscopes II - 7
Description of the instrument
SPO
mtx 1052
Harmonic
analyser
Description of the instrument (contd.)
Presentation
This is a four-in-one instrument:
•
a traditional Oscilloscope with the FFT function for analysing
signals present in electronics and electrotechnical applications
•
an SPO Oscilloscope (Smart Persistence Oscilloscope) that
enables an analogue display to be reproduced and rare
phenomena displayed
•
a Harmonics Analyser to represent the fundamental and the first
31 harmonics of low-frequency signals (50-60 Hz network)
•
a Recorder, to capture unique or slow signals
Oscilloscope
mtx 1054
Recorder
display
The instrument works with a constant acquisition depth of 50,000 counts.
The principal control functions can be accessed directly on the PC control
panel. The adjustment parameters can be modified using the mouse.
Interfaces
This instrument comes with two interfaces ETHERNET, USB ; WiFi
(optional) :
for remote management of the instrument
for controlling the instrument using SCPI commands
II - 8 Virtual digital oscilloscopes
Description of the instrument
Description of the instrument (contd.)
Operation
"LOCAL" The instrument is directly connected to the control PC via an "Ethernet
"NETWORK" The instrument and control PC can be connected to the ETHERNET
« WiFi »
(optional)
The instrument can operate in two modes:
twisted cable" or an USB cable.
network with an untwisted Ethernet cable.
The SCOPEin@BOX software can be activated several times from the PC
to control several instruments at a time. By keeping one instrument
displayed on the PC screen and putting the other instruments as icons, all
the instruments can then be controlled in turn.
With the SCOPEin@BOX software, it is not possible to open an
instrument already open.
Two operating modes are available :
1. ADHOC mode :
the instrument and the PC (with a WiFi card) communicate directly
Minimum PC configuration required
Installation of
SCOPEin@BOX
2. INFRASTRUCTURE mode :
instrument (connected to an Ethernet network access point)
and PC communicate via the Ethernet network.
• Processor Pentium II or equivalent
• Memory 64 Mb
• Disk space 100 Mb
• Ports USB 1.1
• Ethernet Network Adapter 10BaseT
• Operating systems - Windows 98 - Millennium - 2000 - XP - Vista
The SCOPEin@BOX software operates with the NI-VISA V4.40
version: this version is included in the installation programme
supplied.
Please refer to the "First Installation" instructions that come with the
instrument.
Virtual digital oscilloscopes II - 9
Description of the instrument
r
Description of the instrument (contd.)
Views
MTX 1054
« ON » LED lits :
the oscilloscope is on.
« READY » LED lits : the
oscilloscope is initialized.
Connection
MTX 1054
Rear panel
MTX 1052
MTX 1052
CH4 signal input CH3 signal input CH2 signal input CH1 signal input
EXT signal
input
Mains plug
USB Connecto
ETHERNET RJ45
Connector
II - 10 Virtual digital oscilloscopes
Description of the instrument
Host ID
Description of the instrument (contd.)
General principles
of the ETHERNET
ETHERNET and TCP/IP (Transmission Control Protocol/Internet Protocol)
are used to communicate on a company network.
network
Addressing Each piece of equipment under TCP/IP has a physical address (MAC
ETHERNET physical address
ADDRESS) and an Internet address (IP).
A physical address or MAC ADDRESS, stored in the ROM, identifies each
piece of equipment on the network. The physical address enables the
equipment to determine the source of data "packet" transmission.
The physical address is a number coded over 6 bytes represented in
hexadecimal form.
Equipment manufacturers obtain physical addresses from the IEEE
organisation and assign them to the products manufactured in incremental
order. Each instrument has a unique MAC ADDRESS that cannot be
IP address
modified by the user.
An IP address is coded over 4 bytes, displayed in decimal format.
( Example: 132.147.250.10). Each field may be coded between 0 and
255 and is separated by a decimal point.
Unlike the physical address, the IP address can be modified by the user.
You must ensure that the IP address assigned to the instrument is
unique on your network. If an address is duplicated, network
operation becomes random.
The IP address is made up of two parts:
the network identifier (Network ID) for a given physical network
the host identifier (Host ID) identifying a specific item of equipment on the
same network.
There are 5 addressing classes. Only classes A, B and C are used to
identify the equipment. See below:
Class A
0XXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Network ID Host ID
Class B
10XXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Network ID
Class C
110XXXXX XXXXXXXX XXXXXXXX XXXXXXXX
Network ID Host ID
Virtual digital oscilloscopes II - 11
Description of the instrument
Description of the instrument (contd.)
FTP protocol FTP (File Transfer Protocol) is used in the oscilloscope for fast file
HTTP protocol With this protocol, the instrument can function as a Web server. You can
To communicate on the network, the equipment (oscilloscope, PC, printer)
must use a compatible IP address (identical Network ID field).
transfers to or from a PC.
To use it, open the browser on the PC and, in the URL field, type the IP
address of the instrument, preceded by "ftp:"
Example: ftp://192.168.3.1
The oscilloscope is an FTP server.
access the usual adjustments:
Display of traces on your PC via a browser (EXPLORER, NETSCAPE, …)
To use it, open the browser on the PC and, in the URL field, type the IP
address of the instrument, preceded by "http:"
Example: http://192.168.3.1
See §. Applications p. 138.
To be able to display the traces, you must install Java Virtual Machine
JVM SUN 1.4.2 (or higher) on your PC. This JVM can be downloaded
from the site: http://java.sun.com/).
II - 12 Virtual digital oscilloscopes
Getting started
Getting started
Command software
Installation Carefully read the safety instructions shipped with the instrument and
Launching When the oscilloscope's "READY" LED lights, you can launch the
First start-up
The command software is SCOPEin@BOX :
insert the CDROM in your PC CD drive.
SCOPEin@BOX software.
At first start-up the following windows are opened:
Enter a "name" for the instrument
(by default MTX is selected) ; the
instrument configuration files will be
associated to this name.
Launches online help for this window.
Restarts a search for connected
i
nstruments.
The SCOPEin@BOX software
automatically searches for MTX
oscilloscopes connected to the PC
by using USB, or ETHERNET
(RJ45 cable) or WiFi (if installed).
It then displays the list of these
instruments with, for each one:
- its generic name,
- the onboard software version
- the serial number.
The selected MTX oscilloscope's IP
address and the PC's address are
displayed.
Press the key to refresh the display if your oscilloscope does
not appear in the list of connected instruments.
If this fails, check your instrument's connection and/or re-start it
by disconnecting and reconnecting it to the power supply.
1. Name your instrument.
2. Select one of the instruments connected to the PC (via USB or
ETHERNET) from the proposed lists.
3. Click on the button to create and launch the instrument.
In our example we are starting up the "MTX" oscilloscope for the
first time.
By default the instrument's IP address is 14.3.211.111 (with the
255.255.255.0 network mask).
The instrument's IP address must therefore be adapted to the
network address used by the host-PC (here: 14.3.212.1).
Virtual digital oscilloscopes III - 13
Getting started
Getting started (contd.)
First start-up (contd.)
The selection of an instrument connected using Ethernet leads to the
display of the following window if the
IP address, entered by default, is not compatible with the network to
which the PC is connected:
To avoid IP address conflicts on the network you are using, consult
your administrator in order to select an available address that is
compatible with the network.
In our example the network mask used is 255.255.0.0; we program our
IP address: 14.3.215.215 and validate the entry using the key.
The IP address is tested on validation to make sure that the entered
address is not already used on the network.
If the result is correct the instrument starts up.
III - 14 Virtual digital oscilloscopes
Getting started
Information relative to the
The functional modes are shown by
green LEDs
the selected
configuration
Getting started (contd.)
selected instrument
(here MTX)
Selection
of the oscilloscope
and the corresponding
configuration
Deletion of
Start-up of
Selection of the communication mode.
(LED lights = connection established).
The LED is red if the Ethernet
communication uses WiFi.
The oscilloscope can also be controlled via the USB communication
Create a new oscilloscope
the selected instrument
Exit the application
interface by moving the switch selection.
The 2 green LEDs lit indicates that the 2 communication interfaces can be
selected to control the oscilloscope with the PC.
Virtual digital oscilloscopes III - 15
Oscilloscope Instrument - Display
Tool bar
box
p. 18.
setting
p. 17
box
34.
"Oscilloscope" Instrument
Display of the “Oscilloscope Control” Window
c. « Vertical »
e. « Trigger »
a. Drop-down
menus
b.
box see
see
g. « FFT »
see p.
d. « Horizontal »
setting box
see p. 18
f. 6 Control
buttons
see p. 33
a. Drop-down menus
b. Tool bar
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
1. Direct access to the oscilloscope
2. Direct access to the display in SPO
3. Direct access to the recorder
4. Direct access to the harmonics analyser
5.
Display of the grid
6.
Vertical unit
7.
Signal display persistence
8.
Automatic measurements
9.
Direct access to FFT representation
10.
Choice of the measurement reference
11.
Snap-to-point measurements
12.
Direct access to the print window
13.
Export to EXCEL
14.
Keyboard shorcut
15.
Direct access to the operating instructions in .pdf format
16.
Type of communication [USB, ETHERNET (or WiFi, optional)]
IV - 16 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
c. « Vertical » setting box
CHx MATHx MEMx Channel selection
Probe
(∗) or MATHx in MTX 1052 version
Probe coefficient setting :
The offset multiplying coefficient of the probe assigns a multiplying coefficient
to the sensitivity of the channel in question.
The variation range is: 0 to 100 000.
The Volt/div channel vertical scale will be modified by the Probe value.
Ensure you reset the Probe coefficient value to 1 by disconnecting the
probe from the input.
(∗)
Volt/div. Selection of vertical sensitivity Vertical sensitivity: 15 calibres ranging from
2.5 mV / div. to 100 V / div.
Coupling Selection of input coupling :
AC blocks the DC component input signal and attenuates signals below
10 Hz.
DC transmits the input signal to the DC and AC components.
GND internally, the instrument links the input of the channel selected at the
0 V reference level (with this coupling, the input impedance 1 MΩ //
13 pF is retained).
Position Setting for the trace vertical position
Variation range : ±10 div.
BWL
Autoset
Bandwidth limitation selection
There are 4 possible bandwidth limitations for the vertical channel:
none, 15 MHz, 1.5 MHz and 5kHz.
BWL limits the bandwidth of the channel and its trigger circuit, attenuates
display noise and optimises triggering.
Vertical CHx autoset activation buttons
automatically adjusts the vertical sensitivity to the signal present on input
validated.
Virtual digital oscilloscopes IV - 17
"Oscilloscope" Instrument (contd.)
d. “Horizontal”
setting box
T/div
Sweep coefficient or acquisition time base
Oscilloscope Instrument - Display
H-pos Trigger
e. "Trigger”
setting box
Trigger
Mode
Horizontal position of the trigger
The time base can be modified.
Auto Automatic acquisition and refreshment, even in the
absence of a trigger event
Triggered Acquisition and refreshment of the screen for each
trigger event
Single shot Acquisition of the signal and refreshment of the
screen on the first trigger after resetting of the trigger
by clicking on
Principal trigger on edge
Pulse trigger on pulse width
Delay delayed trigger
Count trigger after point
TV trigger on video signal
Line trigger on mains supply
Source
Edge
Level
LEVEL 50 %
Selection of the
trigger source CH1, CH2, CH3 or CH4 (MTX 1054)
CH1, CH2 or EXT (MTX 1052)
Selection of the + trigger edge
- trigger edge
Trigger level in mV
Automatically adjusts the trigger level to 50 % of the peak-to-peak amplitude
of the signal.
Trigger and advanced trigger, see next pages.
IV - 18 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
The oscilloscope has "advanced trigger" capability :
Virtual digital oscilloscopes IV - 19
"Oscilloscope" Instrument (contd.)
Oscilloscope Instrument - Display
Definition
• The "Delay" and "Count" trigger modes require parameterization of a
second "auxiliary" trigger source. The auxiliary source may be the same
as the main source.
The trigger choice is validated by exiting from the menu with OK.
If … Then …
… the user exits from the Main tab he is in Main trigger mode.
… the user exits from the Pulse tab he is in Pulse trigger mode.
etc. etc.
• There is only one Holdoff, although it can be programmed from the
Main, Delay, Count, TV and Line tabs.
When Delay or Count is being used, the Holdoff applies the auxiliary
source.
In the other cases, Holdoff applies to the main trigger source.
• Each trigger source has its own specific attributes: Coupling, Level,
Edge, Noise Reject, Filter
IV - 20 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
Trigger on
MAIN edge
MTX 1054 : Choice of main source: channel 1, 2, 3 or 4
MTX 1052 : Choice of main source: channel 1, 2 or Ext
+ rising trigger slope
- falling trigger slope
AC - DC - LF reject - HF reject
The trigger symbol takes on the colour of the active trigger channel.
The active coupling of the trigger channel is indicated beside the
Trigger symbol in the "Oscilloscope Trace" window.
AC
DC
TAC symbol
AC coupling (10 Hz to 200 MHz):
blocks the DC component of the signal.
T symbol
DC coupling (0 to 200 MHz):
allows the entire signal through
LF Reject
HF Reject
Virtual digital oscilloscopes IV - 21
TLF symbol
Reject of source signal frequencies < 10 kHz
facilitates observation of signals with a DC component or an
unwanted low frequency
THF symbol
Rejection of source signal frequencies > 10 kHz:
facilitates observation of slow signals with high-frequency noise
"Oscilloscope" Instrument (contd.)
adjusts the trigger level by moving the scrollbar with the mouse or directly
entering the value with the keyboard. The variation range is ± 8 vertical
divs.
No Hysteresis ≈ 0.6 div.
Yes Hysteresis ≈ 1.5 div.
Variation range: from 40.00 ns to 10.5 s
disables the trigger for a predefined period
stabilises the trigger on pulse trains.
When adjustment is finished, clicking on the button:
applies the new trigger parameters by exiting the window
applies the new parameters without exiting the window
Oscilloscope Instrument - Display
Example
exits the window without applying the new parameters
Signal injected on CH1: trains of 4 sine wave signals with a frequency of
4 kHz and amplitude 2.5 Vcc with no DC component, separated by 1 ms.
Oscilloscope adjustment:
- Vertical sensitivity: 0.5 V/div.
- Time base: 500 µs/div.
- Trigger source: channel 1
- Trigger level: 0.250 V
- Edge: rising
The Holdoff stabilises the signal by inhibiting the trigger for a value of
between 2.8 ms and 3.8 ms (e.g. Holdoff = 3 ms).
IV - 22 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
Trigger on PULSE
Selection of pulse-width trigger.
In all cases, the effective trigger occurs on the pulse trailing edge.
< triggers on a pulse if its width is less than the value set
= triggers on a pulse if its width is equal to the value set
> triggers on a pulse if its width is greater than the value set
The pulse width is defined by the crossing of the signal with the
vertical Trigger level
MTX 1054 : Choice of main source: channel 1, 2, 3 or 4
MTX 1052 : Choice of main source: channel 1, 2 or Ext
Pulse type: + positive or - negative
The choice of the edge + (rising) or- (falling) defines the pulse polarity:
edge + defines a positive pulse between and
edge - defines a negative pulse between and
Filters the trigger channel: AC - DC - LF reject - HF reject
Variation range: ± 8 div.
Trigger sensitivity changes from ≈ 0.6 div. to ≈ 1.5 div.
Variation range: from 40.00 ns to 10.5 s
if pulse > = < the value specified (variation range
from 20.00 ns to 10.5 s, our example: 20.00 ns)
Virtual digital oscilloscopes IV - 23
"Oscilloscope" Instrument (contd.)
Oscilloscope Instrument - Display
Example
Signal injected on CH1: trains of 4 negative pulses with amplitude 2.25 Vcc,
no DC component, and a frequency of 10 kHz, separated by 500 µs.
Oscilloscope adjustment:
- Vertical sensitivity: 0.5 V/div.
- Time base: 200 µs/div.
- Trigger mode: Pulse
- Trigger source. : CH 1
- Trigger level: : 0.5 V
- Trigger on pulse: negative
- Trigger condition : "if the pulse width is < 50.05 µs"
The oscilloscope is triggered when the negative pulse width is less than the
specified pulse width (50.05 µs + tolerance).
Measurement of the negative pulse width is triggered on the falling edge
and the trigger is effective on the rising edge, if the pulse width meets the
comparison criterion chosen.
IV - 24 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
Trigger with DELAY
Main source
Selection of edge trigger with delay
The delay is triggered by the auxiliary source.
Effective triggering occurs after the end of the delay on the next event from
the main source.
MTX 1054 : Trigger source: channel 1, 2, 3 or 4
MTX 1052 : Trigger source: channel 1, 2 or Ext
+ for rising edge
- for falling edge
AC - DC - LF reject - HF reject
Variation range: ± 8 div.
Trigger sensitivity changes from: ≈ 0.6 div. to ≈ 1.5 div.
Virtual digital oscilloscopes IV - 25
"Oscilloscope" Instrument (contd.)
Oscilloscope Instrument - Display
Auxiliary source
Example
MTX 1054 : Trigger source: channel 1, 2, 3 or 4
MTX 1052 : Trigger source: channel 1, 2 or Ext
Trigger edge: + or -
AC - DC - LF reject - HF reject
Variation range: ± 8 div.
Trigger sensitivity changes from: ≈ 0.6 div. to ≈ 1.5 div.
Variation range: from 40.00 ns to 10.5 s
If the same source is selected for main and auxiliary trigger, the level,
edge, coupling and noise reject have the same values.
Signal injected on CH1: trains of 4 pulses with amplitude 2.25 Vcc and a
frequency of 10 kHz, separated by 600 µs.
Oscilloscope adjustment:
- Vertical sensitivity: 0.5 V/div.
- Time base: 200 µs/div.
- Trigger mode: Delay
- Main channel: CH1
- Auxiliary channel: CH 1
- Trigger level: 0.5 V
- Trigger condition: 1st rising edge of the main source (CH1) occurring
after the first rising edge of the auxiliary source
The trigger is active after the end of the delay (90.0 µs) on the first
ascending edge. The oscilloscope therefore triggers on the 2nd rising edge
of the signal since the delay in relation to the 1st rising edge is 100 µs.
IV - 26 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
Trigger with COUNT
Main source
Selects the edge trigger with counting of events.
Events are counted on the main source and this is triggered by the auxiliary
source.
The trigger position is situated after the end of the count on the next trigger
event from the main source.
The symbolic representation of counting mode corresponds to a series of
positive edges.
Range from 2 to 16,384
MTX 1054 : Trigger source: channel 1, 2, 3 or 4
MTX 1052 : Trigger source: channel 1, 2 or Ext
Trigger edge: + -
AC - DC - LF reject - HF reject
Variation range: ± 8 div.
Trigger sensitivity changes from: ≈ 0.6 div. to ≈ 1.5 div.
Virtual digital oscilloscopes IV - 27
"Oscilloscope" Instrument (contd.)
Oscilloscope Instrument - Display
Auxiliary source
Example
MTX 1054 : Trigger source: channel 1, 2, 3 or 4
MTX 1052 : Trigger source: channel 1, 2 or Ext
Trigger edge: + -
AC - DC - LF reject - HF reject
Variation range: ± 8 div.
Trigger sensitivity changes from: ≈ 0.6 div. to ≈ 1.5 div.
Variation range: from 40.00 ns to 10.5 s
Signal injected on CH1: trains of 4 pulses with amplitude 2.25 Vcc and a
frequency of 10 kHz, separated by 600 µs.
Oscilloscope programming:
- Vertical sensitivity: 0.5 V/div.
- Time base: 200 µs/div.
- Trigger mode: Count
- Main trigger source: CH 1
- Auxiliary trigger source: CH1
- Number of events: 3
Trigger occurs on the 4th rising edge of the signal (the 1st rising edge on the
auxiliary channel triggers counting, the oscilloscope counts 3 rising edges
on the main channel and acquisition is then triggered).
IV - 28 Virtual digital oscilloscopes
Oscilloscope Instrument - Display
"Oscilloscope" Instrument (contd.)
Trigger on TV
Trigger on a specific line number. The trigger position corresponds to the
edge before line synchronisation go-ahead.
• 625 lines (SECAM or PAL)
• 525 lines (NTSC)
The symbolic representation of TV trigger corresponds to a positive video
signal.
MTX 1054 : Trigger source: channel 1, 2, 3 or 4
MTX 1052 : Trigger source: channel 1, 2 or Ext
Video signal polarity: + positive or - negative
+ Direct video
- Reverse video
Variation range: from 40.00 ns to 10.5 s
Standard 625 or 525 lines (PAL/SECAM, NTSC)
Line N°: from 0 to 525 or 625 depending on the standard
Virtual digital oscilloscopes IV - 29
"Oscilloscope" Instrument (contd.)
Oscilloscope Instrument - Display
Example
Video signal display (SECAM)
Signal injected on CH1: video signal with a 625-line amplitude approx. 1.2V
Oscilloscope programming:
- Vertical sensitivity: 200 mV/div.
- Time base: 25 µs/div.
- Trigger mode: TV
- Polarity: +
- Line number: 25
- Manual measurements: line frequency period with dX and 1 / dX
IV - 30 Virtual digital oscilloscopes
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