Tektronix TDS 520A, 540A, 524A, 544A User Manual
User Manual
TDS 520A, 524A, 540A, & 544A
Digitizing Oscilloscopes
070-8710-01
Please check for change information at the rear
of this manual.
First Printing: July 1993
Revised: November 1993
Instrument Serial Numbers
Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the
chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the
serial number are assigned sequentially and are unique to each instrument. Those manufactured in the United
States have six unique digits. The country of manufacture is identified as follows:
B010000 Tektronix, Inc., Beaverton, Oregon, USA
E200000 Tektronix United Kingdom, Ltd., London
J300000 Sony/Tektronix, Japan
H700000 Tektronix Holland, NV, Heerenveen, The Netherlands
Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit
alpha code to identify the country of manufacture (e.g., JP for Japan, HK for Hong Kong, IL for Israel, etc.).
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
Printed in U.S.A.
Copyright E Tektronix, Inc., 1993. All rights reserved. Tektronix products are covered by U.S. and foreign
patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE, and
SCOPE-MOBILE.
Microsoft is a registered trademark of Microsoft Corporation.
IBM is a registered trademark of International Business Machines.
GPIB-PCII and GPIB-PCIIA are registered trademarks of National Instruments Corporation.
Epson is a registered trademark of Epson America, Inc.
Interleaf is a trademark of Interleaf, Inc.
PostScript is a registered trademark of Adobe Systems Incorporated.
Deskjet, Laserjet, and Thinkjet are registered trademarks of Hewlett-Packard Corporation.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years from
the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair
the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty , Customer must notify Tektronix of the defect before the expiration of the
warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for
packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid.
Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage
resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or
integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing
the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER
WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR
REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE
VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
German Postal Information
Certificate of the Manufacturer/Importer
We hereby certify that the TDS 520A, TDS 524A, TDS 540A, and TDS 544A Oscilloscopes and all
factory-installed options complies with the RF Interference Suppression requirements of Postal Regulation Vfg.
243/1991, Amended per Vfg. 46/1992
The German Postal Service was notified that the equipment is being marketed.
The German Postal Service has the right to re-test the series and to verify that it complies.
TEKTRONIX
Bescheinigung des Herstellers/Importeurs
Hiermit wird bescheinigt, daß der/die/das TDS 520A, TDS 524A, TDS 540A, and TDS 544A Oscilloscopes und
alle fabrikinstallierten Optionen in Übereinstimmung mit den Bestimmungen der Amtsblatt-Verfügung Vfg.
243/1991 und Zusatzverfügung 46/1992 funkentstört sind.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerätes angezeigt und die Berechtigung zur
Überprüfung der Serie auf Einhalten der Bestimmungen eingeräumt.
TEKTRONIX
NOTICE to the user/operator:
The German Postal Service requires that Systems assembled by the operator/user of this instrument must also
comply with Postal Regulation, Vfg. 243/1991, Par. 2, Sect. 1.
HINWEIS für den Benutzer/Betreiber:
Die vom Betreiber zusammengestellte Anlage, innerhalb derer dieses Gerät eingesetzt wird, muß ebenfalls den
Voraussetzungen nach Par. 2, Ziff. 1 der Vfg. 243/1991, genügen.
NOTICE to the user/operator:
The German Postal Service requires that this equipment, when used in a test setup, may only be operated if the
requirements of Postal Regulation, Vfg. 243/1991, Par. 2, Sect. 1.8.1 are complied with.
HINWEIS für den Benutzer/Betreiber:
Dieses Gerät darf in Meßaufbauten nur betrieben werden, wenn die Voraussetzungen des Par. 2, Ziff. 1. 8.1 der
Vfg. 243/1991 eingehalten werden.
EC Declaration of Conformity
We
Tektronix Holland N.V.
Marktweg 73A
8444 AB Heerenveen
The Netherlands
declare under sole responsibility that the
TDS 520A, 524A, 540A, & 544A Digitizing Oscilloscopes
meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility.
Compliance was demonstrated to the following specifications as listed in the official
Journal of the European Communities:
EN 50081–1 Emissions:
EN 55022 Radiated
EN 55022 Conducted
EN 60555–2 Power Harmonics
EN 50082–1 Immunity:
IEC 801–2 Electrostatic Discharge
IEC 801–3 RF Radiated
IEC 801–4 Fast Transients
IEC 801–5 Surge
Welcome
Related Manuals
This is the User Manual for the
Getting Started
The
oscilloscope.
Operating Basics
These articles help you understand why your instrument works the way it
does.
Reference
The
page 3-1 for a complete list of tasks covered in that section.
Appendices
The
useful information.
The following documents are related to the use or service of the digitizing
oscilloscope.
H
H
TDS Family Digitizing Oscilloscopes Programmer Manual
The
part number 070–8709–01) describes using a computer to control the
digitizing oscilloscope through the GPIB interface.
TDS Family Option 05 Video Trigger Instruction Manual
The
part number 070–8748–00) describes use of the video trigger option (for
TDS oscilloscopes equipped with that option only).
section familiarizes you with the operation of the digitizing
covers basic principles of the operation of the oscilloscope.
section teaches you how to perform specific tasks. See
provide an options listing, an accessories listing, and other
TDS Family Digitizing Oscilloscopes
(Tektronix
(Tektronix
.
H
H
H
TDS 520A, 524A, 540A, 544A, & 644A Reference
The
number 070–8711–01) gives you a quick overview of how to operate your
digitizing oscilloscope.
TDS 520A, 524A, 540A, & 544A Performance Verification
The
part number 070–8712–01) tells how to verify the performance of the
digitizing oscilloscope.
TDS 520A, 524A, 540A, & 544A Service Manual
The
number 070–8713–01) provides information for maintaining and servicing
your digitizing oscilloscope to the module level.
(Tektronix part
(Tektronix
(Tektronix part
TDS 620A, 640A, & 644A User Manual
i
Welcome
Conventions
In the
Getting Started
dures which contain steps of instructions for you to perform. To keep those
instructions clear and consistent, this manual uses the following conventions:
H
In procedures, names of front panel controls and menu labels appear in
boldface print.
H
Names also appear in the same case (initial capitals, all uppercase, etc.)
in the manual as is used on the oscilloscope front panel and menus. Front
panel names are all upper case letters, for example, VERTICAL MENU,
CH 1, etc.
H
Instruction steps are numbered. The number is omitted if there is only
one step.
H
When steps require that you make a sequence of selections using front
panel controls and menu buttons, an arrow ( ➞
between a front panel button and a menu, or between menus. Also,
whether a name is a main menu or side menu item is clearly indicated:
Press VERTICAL MENU ➞ Coupling (main) ➞ DC (side) ➞ Band-
width (main) ➞ 100 MHz (side).
and
Reference
sections, you will find various proce-
) marks each transition
Using the convention just described results in instructions that are graphically intuitive and simplifies procedures. For example, the instruction just
given replaces these five steps:
1. Press the front panel button VERTICAL MENU.
2. Press the main menu button Coupling.
3. Press the side-menu button DC.
4. Press the main menu button Bandwidth
5. Press the side menu button 100 MHz
H
Sometimes you may have to make a selection from a popup menu: Press
TRIGGER MENU ➞ Type (main) ➞ Edge (popup). In this example, you
repeatedly press the main menu button Type until Edge is highlighted in
the pop-up menu.
ii
Welcome
Getting Started
Operating Basics
Table of Contents
Safety v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up for the Examples 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 1: Displaying a Waveform 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 2: Multiple Waveforms 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example 3: Automated Measurements 1-17. . . . . . . . . . . . . . . . . . . . . . . .
Example 4: Saving Setups 1-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
At a Glance 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquisition 2-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling and Positioning Waveforms 2-25. . . . . . . . . . . . . . . . . . . . . . . . . .
Measurements 2-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquisition Modes 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Autoset 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Color (TDS 524A & TDS 544A) 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cursor Measurements 3-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed Triggering 3-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Modes 3-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Edge Triggering 3-34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fast Fourier Transforms 3-38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDS 520A, 524A, 540A, & 544A User Manual
iii
Table of Contents
File System (Optional on TDS 520A & TDS 540A) 3-55. . . . . . . . . . . . . .
Hardcopy 3-59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Help 3-67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Control 3-68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Testing 3-73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Triggering 3-78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement System 3-86. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Accessories 3-97. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Cal 3-104. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Compensation 3-110. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Selection 3-112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse Triggering 3-119. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Communication 3-126. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving and Recalling Setups 3-130. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
Saving and Recalling Waveforms 3-133. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selecting Channels 3-136. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Path Compensation 3-138. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status 3-140. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Triggering 3-142. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vertical Control 3-147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Differentiation 3-150. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Integration 3-154. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waveform Math 3-159. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zoom 3-162. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A: Options and Accessories A-1. . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Algorithms A-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Packaging for Shipment A-23. . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Factory Initialization Settings A-25. . . . . . . . . . . . . . . . . . . .
Glossary
Index
i
Contents
Safety
Please take a moment to review these safety precautions. They are provided
for your protection and to prevent damage to the digitizing oscilloscope. This
safety information applies to all operators and service personnel.
Symbols and Terms
These two terms appear in manuals:
H
statements identify conditions or practices that could result in
damage to the equipment or other property.
H
statements identify conditions or practices that could result in
personal injury or loss of life.
These two terms appear on equipment:
CAUTION
H
indicates a personal injury hazard not immediately accessible
as one reads the marking or a hazard to property including the equipment
itself.
H
DANGER
indicates a personal injury hazard immediately accessible as
one reads the marking.
This symbol appears in manuals:
TDS 620A, 640A, & 644A User Manual
Static-Sensitive Devices
These symbols appear on equipment:
DANGER
High Voltage
Protective
ground (earth)
terminal
ATTENTION
Refer to
manual
v
Safety
Specific Precautions
Observe all of these precautions to ensure your personal safety and to prevent damage to either the digitizing oscilloscope or equipment connected to it.
Power Source
The digitizing oscilloscope is intended to operate from a power source that will
not apply more than 250 V
either supply conductor and ground. A protective ground connection, through
the grounding conductor in the power cord, is essential for safe system
operation.
between the supply conductors or between
RMS
Grounding the Digitizing Oscilloscope
The digitizing oscilloscope is grounded through the power cord. To avoid
electric shock, plug the power cord into a properly wired receptacle where
earth ground has been verified by a qualified service person. Do this before
making connections to the input or output terminals of the digitizing oscilloscope.
Without the protective ground connection, all parts of the digitizing oscilloscope are potential shock hazards. This includes knobs and controls that may
appear to be insulators.
Use the Proper Power Cord
Use only the power cord and connector specified for your product. Use only a
power cord that is in good condition.
Use the Proper Fuse
To avoid fire hazard, use only the fuse specified in the parts list for your
product, matched by type, voltage rating, and current rating.
Do Not Remove Covers or Panels
To avoid personal injury, do not operate the digitizing oscilloscope without the
panels or covers.
Electric Overload
Never apply a voltage to a connector on the digitizing oscilloscope that is
outside the voltage range specified for that connector.
Do Not Operate in Explosive Atmospheres
The digitizing oscilloscope provides no explosion protection from static discharges or arcing components. Do not operate the digitizing oscilloscope in
an atmosphere of explosive gases.
vi
Safety
Getting Started
Product Description
Your Tektronix digitizing oscilloscope is a superb tool for acquiring, displaying,
and measuring waveforms. Its performance addresses the needs of both
benchtop lab and portable applications with the following features:
H
500 MHz maximum analog bandwidth.
H
1 Gigasample/second maximum digitizing rate (TDS 540A & 544A);
500 Megasamples/second maximum digitizing rate (TDS 520A & 524A).
H
Four-channel acquisition — the TDS 544A & 540A offer four full-featured
channels; the TDS 520A & 524A offer two full-featured channels and two
channels with limited vertical scale selections: 100 mV, 1 V, and 10 V.
H
Waveform Math — Invert a single waveform and add, subtract, multiply,
and divide two waveforms. On instruments with Option 2F: Advanced DSP
Math (standard on the TDS 524A & 544A), integrate or differentiate a
single waveform or perform an FFT (fast fourier transform) on a waveform
to display its magnitude or phase versus its frequency.
H
Eight-bit digitizers.
H
Up to 15,000-point record length per channel (50,000-point optional).
H
Full GPIB software programmability. Hardcopy output using RS-232 or
Centronics ports (Optional on TDS 520A & 540A) and the GPIB.
H
Complete measurement and documentation capability.
H
Intuitive graphic icon operation blended with the familiarity of traditional
horizontal and vertical knobs.
H
On-line help at the touch of a button.
TDS 520A, 524A, 540A, & 544A User Manual
1Ć1
Product Description
1Ć2
Getting Started
Start Up
Before you use the digitizing oscilloscope, ensure that it is properly installed
and powered on.
Before You Begin
Operation
To ensure maximum accuracy for your most critical measurements, you
should know about signal path compensation.
Signal Path Compensation
Be sure you compensate your oscilloscope for the surrounding temperature.
This action, called
possible accuracy for your most critical measurements. See
Compensation
on this feature.
To properly install and power on the digitizing oscilloscope, do the following:
Signal Path Compensation (SPC)
on page 3-138 for a description of and operating information
, ensures maximum
Signal Path
Installation
1. Be sure you have the appropriate operating environment. Specifications
for temperature, relative humidity, altitude, vibrations, and emissions are
included in the
manual (Tektronix part number 070–8712–01).
2. Leave space for cooling. Do this by verifying that the air intake and exhaust holes on the sides of the cabinet (where the fan operates) are free
of any airflow obstructions. Leave at least 5.1 cm (2 inches) free on each
side.
TDS 520A, 524A, 540A, & 544A Performance Verification
TDS 620A, 640A, & 644A User Manual
WARNING
To avoid electrical shock, be sure that the power cord is disconnected before checking the fuse.
3. Check the fuse to be sure it is the proper type and rating (see Figure 1-1).
You can use either of two fuses. Each fuse requires its own cap (see
Table 1-1). The digitizing oscilloscope is shipped with the UL approved
fuse installed.
1Ć3
Start Up
Power Connector
Principal Power Switch
Fuse
4. Check that you have the proper electrical connections. The digitizing
oscilloscope requires 90 to 250 VAC
, continuous range, 47 Hz to
RMS
63 Hz, and may require up to 300 W.
5. Connect the proper power cord from the rear-panel power connector (see
Figure 1-1) to the power system.
Figure 1-1: Rear Panel Controls Used in Start Up
Table 1-1: Fuse and Fuse Cap Part Numbers
Fuse
.25 inch × 1.25 inch (UL 198.6, 3AG):
Fuse Part
Number
Fuse Cap Part
Number
159–0013–00 200–2264–00
6 A FAST, 250 V.
5 mm × 20 mm (IEC 127): 5 A (T),
159–0210–00 200–2265–00
250 V.
Front Cover Removal
Remove the front cover by grasping its left and right edges and snapping it off
of the front subpanel. (When reinstalling, align and snap back on.)
Power On
1. Check that the rear-panel principal power switch is on (see Figure 1-1).
The principal power switch controls all AC power to the instrument.
1Ć4
2. If the oscilloscope is not powered on (the screen is blank), push the
front-panel ON/STBY button to toggle it on (see Figure 1-2).
The ON/STBY button controls power to most of the instrument circuits.
Power continues to go to certain parts even when this switch is set to
STBY.
Getting Started
ON/STBY Button
Start Up
Once the digitizing oscilloscope is installed, it is typical to leave the principal power switch on and use the ON/STBY button as the power switch.
Figure 1-2: ON/STBY Button
Self Test
Check the self test results. The digitizing oscilloscope automatically performs
power-up tests each time it is turned on. It will come up with a display screen
that states whether or not it passed self test. (If the self test passed, the
status display screen will be removed after a few seconds.)
If the self test fails, call your local Tektronix Service Center. Depending on the
type of failure, you may still be able to use the oscilloscope before it is serviced.
Power Off
Toggle the ON/STBY switch to turn off the oscilloscope.
TDS 620A, 640A, & 644A User Manual
1Ć5
Setting Up for the Examples
All the examples use the same setup. Once you perform this setup, you do
not have to change the signal connections for any of the other examples.
Remove all probes and signal inputs from the input BNC connectors along the
lower right of the front panel. Then, using one of the probes supplied with the
digitizing oscilloscope, connect from the CH 1 connector to the PROBE
COMPENSATION connectors (see Figure 1-3).
1Ć6
Figure 1-3: Connecting a Probe for the Examples
Getting Started
Example 1: Displaying a Waveform
In this first example you learn about resetting the digitizing oscilloscope,
displaying and adjusting a waveform, and using the autoset function.
Resetting the Digitizing Oscilloscope
SETUP Button
All examples in the tutorial begin by resetting the digitizing oscilloscope to a
known factory default state. Reset the oscilloscope when you begin a new
task and need to “start fresh” with known default settings.
1. Press the save/recall SETUP button to display the Setup menu (Figure 1-4).
Figure 1-4: SETUP Button Location
The digitizing oscilloscope displays
screen. Figure 1-5 shows the Setup main menu.
main menus
along the bottom of the
OK Confirm Factory Init
Menu Item and Button
Recall Factory Setup
Menu Item and Button
TDS 620A, 640A, & 644A User Manual
Figure 1-5: The Displayed Setup Menu
1Ć7
Example 1: Displaying a Waveform
2. Press the button directly below the Recall Factory Setup menu item.
The display shows
side menus
along the right side of the screen. The
buttons to select these side menu items are to the right of the side menu.
Because an accidental instrument reset could destroy a setup that took a
long time to create, the digitizing oscilloscope asks you to verify the
Recall Factory Setup selection (see Figure 1-5).
3. Press the button to the right of the OK Confirm Factory Init side menu
item.
NOTE
This manual uses the following notation to represent the sequence
of selections you made in steps 1, 2 and 3:
UP ➞ Recall Factory Setup (main) ➞ OK Confirm Factory Init
(side).
Note that a clock icon appears on screen. The oscilloscope displays this
icon when performing operations that take longer than several seconds.
4. Press SET LEVEL TO 50% (see Figure 1-6) to be sure the oscilloscope
triggers on the input signal.
Press save/recall SET-
1Ć8
SET LEVEL TO 50% Button
Figure 1-6: Trigger Controls
Getting Started
Example 1: Displaying a Waveform
Display Elements
Figure 1-7 shows the display that results from the instrument reset. There are
several important points to observe:
H
trigger level bar
The
shows that the waveform is triggered at a level near
50% of its amplitude (from step 4).
H
trigger position indicator
The
shows that the trigger position of the wave-
form is located at the horizontal center of the graticule.
H
channel reference indicator
The
shows the vertical position of channel 1
with no input signal. This indicator points to the ground level for the
channel when its vertical offset is set to 0 V in the vertical menu; when
not
vertical offset is
H
trigger readout
The
set to 0 V, it points to the vertical offset level.
shows that the digitizing oscilloscope is triggering on
channel 1 (Ch1) on a rising edge, and that the trigger level is about
200–300 mV.
H
time base readout
The
shows that the main time base is set to a horizon-
tal scale of 500ms/div.
H
channel readout
The
indicates that channel 1 (Ch1) is displayed with DC
coupling. (In AC coupling, ~ appears after the volts/div readout.) The
digitizing oscilloscope always displays channel 1 at reset.
Trigger Level
Bar
Trigger Position Indicator
Channel Reference Indicator
Trigger Readout
Time Base Readout
Channel Readout
Figure 1-7: The Display After Factory Initialization
Right now, the channel, time base, and trigger readouts appear in the graticule area because a menu is displayed. You can press the CLEAR MENU
button at any time to remove any menus and to move the readouts below the
graticule.
TDS 620A, 640A, & 644A User Manual
1Ć9
Example 1: Displaying a Waveform
Adjusting the Waveform Display
The display shows the probe compensation signal. It is a 1 kHz square wave
of approximately 0.5 V amplitude. You can adjust the size and placement of
the waveform using the front-panel knobs.
Figure 1-8 shows the main VERTICAL and HORIZONTAL sections of the
front panel. Each has SCALE and POSITION knobs.
1. Turn the vertical SCALE knob clockwise. Observe the change in the
displayed waveform and the channel readout at the bottom of the display.
Using Autoset
Figure 1-8: The VERTICAL and HORIZONT AL Controls
2. Turn the vertical POSITION knob first one direction, then the other.
Observe the change in the displayed waveform. Then return the waveform to the center of the graticule.
3. Turn the horizontal SCALE knob one click clockwise. Observe the time
base readout at the bottom of the display. The time base should be set to
200ms/div now, and you should see two complete waveform cycles on
the display.
When you first connect a signal to a channel and display it, the signal displayed may not be scaled and triggered correctly. Use the autoset function
and you should quickly get a meaningful display.
When you reset the digitizing oscilloscope, you see a clear, stable display of
the probe compensation waveform. That is because the probe compensation
signal happens to display well at the default settings of the digitizing oscilloscope.
1Ć10
Getting Started
Example 1: Displaying a Waveform
1. To create an unstable display, slowly turn the trigger MAIN LEVEL knob
(see Figure 1-9) first one direction, then the other. Observe what happens
when you move the trigger level above the highest part of the displayed
waveform. Leave the trigger level in that untriggered state.
2. Press AUTOSET (see Figure 1-10) and observe the stable waveform
display.
MAIN LEVEL Knob
Figure 1-9: TRIGGER Controls
AUTOSET Button
Figure 1-10: AUTOSET Button Location
Figure 1-11 shows the display after pressing AUTOSET. If necessary, you can
adjust the waveform now by using the knobs discussed earlier in this example.
TDS 620A, 640A, & 644A User Manual
1Ć11
Example 1: Displaying a Waveform
Figure 1-11: The Display After Pressing Autoset
NOTE
If the corners on your displayed signal look rounded or pointed (see
Figure 1-12), then you may need to compensate your probe. The
Probe Compensation
pensate your probe.
Figure 1-12: Display Signals Requiring Probe Compensation
section on page 3-110 explains how to com-
1Ć12
Getting Started
Example 2: Multiple Waveforms
In this example you learn how to display and control more than one waveform
at a time.
Adding a Waveform
The VERTICAL section of the front panel contains the channel selection
buttons. These are CH 1, CH 2, CH 3, CH 4, and MORE (Figure 1-13); on the
TDS 620A & 524A, they are CH 1, CH 2, AUX 1, AUX 2, and MORE.
TDS 620A, 640A, & 644A User Manual
Figure 1-13: The Channel Buttons and Lights
Each of the channel (CH) buttons has a light above its label. Right now, the
CH 1 light is on. That light indicates that the vertical controls are set to adjust
channel 1.
The following steps add a waveform to the display.
1. If you are not continuing from the previous example, follow the instructions on page 1-6 under the heading
2. Press SETUP ➞ Recall Factory Setup (main) ➞ OK Confirm Factory
Init (side).
Setting Up for the Examples
.
1Ć13
Example 2: Multiple Waveforms
3. Press AUTOSET.
4. Press CH 2.
The display shows a second waveform, which represents the signal on
channel 2. Since there is nothing connected to the CH 2 input connector,
this waveform is a flat line.
There are several other important things to observe:
H
The channel readout on the display now shows the settings for both
Ch1 and Ch2.
H
There are two channel indicators at the left edge of the graticule.
Right now, they overlap.
H
The light next to the CH 2 button is now on, and the CH 1 light is off.
Because the knobs control only one channel at a time, the vertical
controls are now set to adjust channel 2.
H
The trigger readout still indicates that the trigger is detecting trigger
events on Ch1. The trigger source is not changed simply by adding a
channel. (You can change the trigger source by using the TRIGGER
MENU button to display the trigger menu.)
5. Turn the vertical POSITION knob clockwise to move the channel 2 wave-
form up on the graticule. You will notice that the channel reference indicator for channel 2 moves with the waveform.
6. Press VERTICAL MENU ➞ Coupling (main).
The VERTICAL MENU button displays a menu that gives you control
over many vertical channel parameters (Figure 1-14). Although there can
be more than one channel displayed, the vertical menu and buttons only
adjust the selected channel.
Each menu item in the Vertical menu displays a side menu. Right now,
the Coupling item in the main menu is highlighted, which means that the
side menu shows the coupling choices. At the top of the side menu, the
menu title shows the channel affected by the menu choices. That always
matches the lighted channel button.
7. Press W (side) to toggle the selection to 50 W. That changes the input
coupling of channel 2 from 1 MW to 50 W. The channel readout for channel 2 (near the bottom of the graticule) now shows an W indicator.
1Ć14
Getting Started
Ch2 Reference Indicator
Side Menu Title
Example 2: Multiple Waveforms
Changing Controls to Another Channel
Figure 1-14: The Vertical Main Menu and Coupling Side Menu
Pressing a channel (CH) button sets the vertical controls to that channel. It
also adds the channel to the display if that waveform is not already displayed.
1. Press CH 1.
Observe that now the side menu title shows Ch1 (Figure 1-15), and that
the light above CH 1 is lighted. The highlighted menu item in the side
menu has changed from the 50W channel 2 setting to the 1MW impedance setting of channel 1.
2. Press CH 2 ➞ W (side) to toggle the selection to 1MW. That returns the
coupling impedance of channel 2 to its initial state.
TDS 620A, 640A, & 644A User Manual
1Ć15
Example 2: Multiple Waveforms
Side Menu Title
Removing a Waveform
Figure 1-15: The Menus After Changing Channels
Pressing the WAVEFORM OFF button removes the waveform for the current-
ly selected channel. If the waveform you want to remove is not already selected, select that channel using the channel (CH) button.
1. Press W AVEFORM OFF (under the vertical SCALE knob).
Since the CH 2 light was on when you pressed the WAVEFORM OFF
button, the channel 2 waveform was removed.
The channel (CH) lights now indicate channel 1. Channel 1 has become
the selected channel. When you remove the last waveform, all the CH
lights are turned off.
2. Press W AVEFORM OFF again to remove the channel 1 waveform.
1Ć16
Getting Started
Example 3: Automated Measurements
In this example you learn how to use the automated measurement system to
get numeric readouts of important waveform characteristics.
Displaying Automated Measurements
To use the automated measurement system, you must have a stable display
of your signal. Also, the waveform must have all the segments necessary for
the measurement you want. For example, a rise time measurement requires
at least one rising edge, and a frequency measurement needs at least one
complete cycle.
1. If you are not continuing from the previous example, follow the instructions on page 1-6 under the heading
2. Press SETUP ➞ Recall Factory Setup (main) ➞ OK Confirm Factory
Init (side).
3. Press AUTOSET.
4. Press MEASURE to display the Measure main menu (see Figure 1-16).
Setting Up for the Examples
.
TDS 620A, 640A, & 644A User Manual
Figure 1-16: Measure Main Menu and Select Measurement Side Menu
1Ć17
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