User Manual
TDSPWR1
Power Analysis Applications
071-0203-01
This document applies to software version 1.0.0
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
User Manual
TDSPWR1
Power Analysis Applications
071-0203-01
This document supports software version 1.0.0
and above.
Warning
The servicing instructions are for use by
qualified personnel only. To avoid personal
injury, do not perform any servicing unless you
are qualified to do so. Refer to all safety
summaries prior to performing service.
Copyright © T ektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and
are protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the
Rights in T echnical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the
Commercial Computer Software – Restricted Rights clause at F AR 52.227-19, as applicable.
T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Printed in the U.S.A.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix warrants that the media on which this software product is furnished and the encoding of the programs on the media
will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment. If a
medium or encoding proves defective during the warranty period, T ektronix will provide a replacement in exchange for the
defective medium. Except as to the media on which this software product is furnished, this software product is provided “as
is” without warranty of any kind, either express or implied. T ektronix does not warrant that the functions contained in this
software product will meet Customer’s requirements or that the operation of the programs will be uninterrupted or error-free.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period. If T ektronix is unable to provide a replacement that is free from defects in materials and workmanship
within a reasonable time thereafter, Customer may terminate the license for this software product and return this software
product and any associated materials for credit or refund.
THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO
REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT 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.
Table of Contents
Getting Started
Operating Basics
Related Documentation vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting T ektronix viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compatibility 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements and Restrictions 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Updates 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Application 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downloading Updates from the Web 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Under Test Connections 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Measurements 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Measurements 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting the Application 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Local Help 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Other Functions 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T aking a Measurement 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Viewing the Waveform 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exiting the Application 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tutorial 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Up the Oscilloscope 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting the Application 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Reference Waveform Files 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T aking a Power and Energy Measurement 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving a Setup and Exiting the Application 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recalling a Setup 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T aking a Current Harmonics Measurement 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T aking a Power Factor Measurement 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Frequency 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User-Defined Frequency 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
Menu Structure 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup Parameters 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Saving and Recalling Setups 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Power and Energy 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Current Harmonics 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDSPWR1 Power Analysis Applications User Manual
i
Table of Contents
Index
Measuring Power Factors 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Localizing Measurements 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measurement Descriptions 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W arning Messages 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power and Energy Measurements 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Harmonics Measurements 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Factor Measurements 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
TDSPWR1 Power Analysis Applications User Manual
List of Figures
Table of Contents
Figure 1: TDSPWR1 Power Analysis Applications 1. . . . . . . . . . . . . . .
Figure 2: Current measurements configuration 5. . . . . . . . . . . . . . . . .
Figure 3: Power measurements configuration 6. . . . . . . . . . . . . . . . . . .
Figure 4: Starting the application 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5: Power Analysis Applications initial display 8. . . . . . . . . . . . .
Figure 6: Utility menu 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7: Returning to the application 9. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8: The Control menu 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9: Default tutorial reference waveforms, Ref1 and Ref2 14. . . . .
Figure 10: Ref1 and Ref2, scaled and repositioned 15. . . . . . . . . . . . . . .
Figure 11: Input Config setup for the Power and Energy lesson 16. . . .
Figure 12: View menu for the Power and Energy lesson 17. . . . . . . . . . .
Figure 13: Resulting Ref3 and Ref4 waveforms 18. . . . . . . . . . . . . . . . . .
Figure 14: Saved setup files on the hard disk 19. . . . . . . . . . . . . . . . . . . .
Figure 15: Input Config setup for the Current Harmonics lesson 20. . .
Figure 16: Default table of harmonic limits 21. . . . . . . . . . . . . . . . . . . . .
Figure 17: IEC 61000-3-2 configuration for the Current
Harmonics lesson 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 18: Harmonic Limits LIM_TBL1 values for the lesson 23. . . . . .
Figure 19: Tabular results for the Current Harmonics lesson 24. . . . . .
Figure 20: Bar graph results for the Current Harmonics lesson 25. . . .
Figure 21: Input Config setup for the Power Factor lesson 26. . . . . . . .
Figure 22: Results for the Power Factor lesson 27. . . . . . . . . . . . . . . . . .
Figure 23: User-defined signal frequency for the Power
Factor lesson 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 24: User-defined frequency results for the Power
Factor lesson 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 25: Application menu structure 29. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 26: Save Setup and Recall Setup selections in the
Utility menu 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 27: Power & Energy initial display 32. . . . . . . . . . . . . . . . . . . . . .
Figure 28: Power & Energy View menu 33. . . . . . . . . . . . . . . . . . . . . . . .
Figure 29: Power & Energy Input Config menu 34. . . . . . . . . . . . . . . . .
Figure 30: Current Harmonics initial display 35. . . . . . . . . . . . . . . . . . .
TDSPWR1 Power Analysis Applications User Manual
iii
Table of Contents
List of Tables
Figure 31: Harmonic Limits Table menu with default values 36. . . . . . .
Figure 32: Config IEC 61000-3-2 configuration menu 37. . . . . . . . . . . .
Figure 33: An activated current harmonic limits table 38. . . . . . . . . . . .
Figure 34: Current Harmonics View menu 39. . . . . . . . . . . . . . . . . . . . .
Figure 35: Current Harmonics Input Config menu 40. . . . . . . . . . . . . . .
Figure 36: I-Probe R vs Freq configuration menu 41. . . . . . . . . . . . . . . .
Figure 37: Power Factor initial display 42. . . . . . . . . . . . . . . . . . . . . . . . .
Figure 38: Power Factor Input Config menu 43. . . . . . . . . . . . . . . . . . . .
Figure 39: Examples of the results for all three measurements 45. . . . .
Figure 40: Power and Energy measurement results 47. . . . . . . . . . . . . .
Table 1: Power measurements channel assignments 6. . . . . . . . . . . . . .
Table 2: Power and Energy waveform definitions 34. . . . . . . . . . . . . . .
Table 3: Current Harmonics waveform definitions 41. . . . . . . . . . . . . . .
iv
TDSPWR1 Power Analysis Applications User Manual
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Connect and Disconnect Properly . Connect the probe output to the measurement
instrument before connecting the probe to the circuit under test. Disconnect the
probe input and the probe ground from the circuit under test before disconnecting
the probe from the measurement instrument.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Symbols and Terms
T erms in this Manual. This term may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
TDSPWR1 Power Analysis Applications User Manual
v
General Safety Summary
vi
TDSPWR1 Power Analysis Applications User Manual
Preface
Related Documentation
Conventions
This manual contains operating information for the TDSPWR1 Power Analysis
Applications. The manual consists of the following chapters:
H The chapter Getting Started briefly describes the TDSPWR1 Power Analysis
Applications and provides installation instructions.
H The chapter Operating Basics covers basic operating principles of the
application.
H The chapter Reference describes how to perform specific tasks.
Your oscilloscope user manual provides operating instructions for general
oscilloscope features.
This manual uses the following conventions:
H This manual refers to the TDSPWR1 Power Analysis Applications as either
the Power Analysis Applications or as the application.
H When steps require that you make a sequence of selections using front panel
controls and menu buttons, an arrow ( ➞
front panel button and a menu, or between menus. Names that are for a main
menu or side menu item are clearly indicated: Press VERTICAL MENU ➞
Coupling (main) ➞ DC (side) ➞ Bandwidth (main) ➞ 250 MHz (side).
H The waveforms have subscript annotation with the following meanings:
H V represents electrical potential and is measured in Volts
H I represents electrical current and is measured in Amperes
H P represents power (voltage times current) and is measured in Watts
H E represents energy and is measured in Joules
) marks each transition between a
TDSPWR1 Power Analysis Applications User Manual
vii
Preface
Contacting Tektronix
Product
Support
Service
Support
For other
information
To write us Tektronix, Inc.
For application-oriented questions about a Tektronix measurement product, call toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. – 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Contact your local Tektronix distributor or sales office. Or visit
our web site for a listing of worldwide service locations.
http://www.tek.com
In North America:
1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
P.O. Box 1000
Wilsonville, OR 97070-1000
viii
TDSPWR1 Power Analysis Applications User Manual
Getting Started
Product Description
The TDSPWR1 Power Analysis Applications contain three measurement modes
that add power supply analysis capability to your Tektronix oscilloscope. With
this application, you can acquire and analyze energy emissions and consumption
in accordance with IEC standards. Figure 1 shows an example of the results of a
Power Analysis Applications measurement.
Figure 1: TDSPWR1 Power Analysis Applications
Compatibility
The Power Analysis Applications are compatible with the following Tektronix
oscilloscopes:
H All TDS 500D and 700D Digital Phosphor Oscilloscopes with Option 2M
(8 MB record length and hard disk drive)
H TDS 700C Color Digitizing Oscilloscopes serial number BO20100 or higher
with Option 2M (8 MB record length and hard disk drive) and with firmware
version 5.2e and up.
For a current list of compatible oscilloscopes, check the Tektronix, Inc. web site,
http://www.tek.com/Measurement/
Requirements and Restrictions
The TDSRTE1 Run-Time Environment must be installed on the oscilloscope to
operate the Power Analysis Applications.
in the Support category.
TDSPWR1 Power Analysis Applications User Manual
1
Product Description
Updates
Accessories
The application does not support external GPIB commands.
You can find information about this and other applications at the Tektronix, Inc.
web site, http://www.tek.com/Measurement/
this site for application updates that you can download.
There are no standard accessories for this product.
under the Support category. Check
2
TDSPWR1 Power Analysis Applications User Manual
Installation
This application is written on a floppy disk. Updates, if any, can be downloaded
from the Tektronix web site.
NOTE. The Power Analysis Applications requires the TDSRTE1 Run-Time
Environment to be installed on the oscilloscope. If you have not already installed
the TDSRTE1, you should do so now.
Installing the Application
To install the application from the floppy disk to your oscilloscope, follow these
steps:
1. Power off the oscilloscope.
NOTE. Additional information about the application or installation is located in a
Readme.txt file on the floppy disk. You should insert the floppy disk into a
DOS-based personal computer and read the Readme.txt file before you continue.
If you are updating the application, the Readme.txt file on the Tektronix web site
supercedes the Readme.txt file on the floppy disk.
2. Insert the disk in the floppy disk drive and power on the oscilloscope.
After performing the power-up self-test, the oscilloscope automatically
begins the installation procedure.
As the application loads from the disk, the oscilloscope displays a clock icon
to indicate that it is busy. Also, the floppy disk drive LED is on, indicating
activity. If the clock icon continues to display after the floppy disk LED has
gone out, a problem has occurred with the installation. Repeat the above
procedure. If the problem persists, contact your Tektronix representative.
When the installation is complete, an Installation Complete message
displays.
3. Remove the floppy disk and cycle power to the oscilloscope.
TDSPWR1 Power Analysis Applications User Manual
3
Installation
Downloading Updates from the Web
If there is an update for this application, it will be available from the Tektronix
web site. To install an application update, you will need to download it from the
web site to a hard disk, copy it to a DOS-formatted floppy disk, and then install it
on your oscilloscope.
NOTE. More information about changes to the application or installation is
located in a Readme file on the web site. You should read it before you continue.
To copy the application from the Tektronix web site, follow these steps:
1. Access the Tektronix web site at http://www.tek.com
2. Select the Measurement web page.
3. Click the Support category.
4. Click the Application Support Files item. This takes you to an FTP site.
5. Click the TDS/THS Files Area item. This takes you to the application files
specific to these oscilloscopes.
6. Scroll through the files to the TDSPWR1 application, and download it to
your hard disk drive.
7. If necessary, unzip the file.
8. Copy the application from the hard disk drive to a DOS-formatted floppy
disk.
9. Follow the Installing the Application procedure on page 3.
/.
4
TDSPWR1 Power Analysis Applications User Manual
Equipment Under Test Connections
The probes you use to connect between your EUT (equipment under test) and
oscilloscope depend on the type of measurement you will take: current or power.
You can use these schemes as typical ways to connect and to characterize the
power supply of an EUT. However, the connection can be to any point of interest.
Current Measurements
When using the Current Harmonics mode, you need to connect a current probe
between the EUT and the oscilloscope. Figure 2 shows a typical connection.
WARNING. To avoid electric shock, you must ensure that power is removed from
the EUT before attaching a probe to it. Do not touch exposed conductors except
with the properly rated probe tips. Refer to the probe manual for proper use.
Power down the EUT before connecting the probe to it.
Low distortion AC
power source
Oscilloscope
Electrical equipment
under test
Neutral
Gnd
CH 2
Figure 2: Current measurements configuration
For connection to the Current signal, you can use an oscilloscope probe designed
specifically for measuring current, such as the Tektronix TCP202 probe.
The default Current signal is assigned to channel 2.
NOTE. Do not change the signal assignment of channel 2. The application always
uses the input data on channel 2 as the Current signal.
TDSPWR1 Power Analysis Applications User Manual
Power cord
Current signal
Current probe
Power
supply
Line
5
Installation
Power Measurements
When using the Power Factor mode or the Power and Energy mode, you need to
connect a voltage probe appropriate for the EUT (such as a differential voltage
probe) and a current probe between the EUT and the oscilloscope. Figure 3
shows a typical connection.
WARNING. To avoid electric shock, you must ensure that power is removed from
the EUT before attaching probes to it. Do not touch exposed conductors except
with the properly rated probe tips. Refer to the probe manuals for proper use.
Power down the EUT before connecting probes to it.
Electrical equipment
under test
Neutral
Gnd
Power
supply
Line
Current probe
Red
Black
Oscilloscope
CH 2CH 1
Low distortion
AC power source
Current signal
Voltage signal
Power cord
High voltage
differential probe
Figure 3: Power measurements configuration
For connection to the Voltage signal, you can use a differential voltage probe,
such as the Tektronix P5205, 100 MHz High Voltage Differential Probe. For
connection to the Current signal, you can use an oscilloscope probe designed
specifically for measuring current, such as the Tektronix TCP202 probe.
Table 1 shows the default channel-to-signal assignments.
T able 1: Power measurements channel assignments
Channel Reference Signal assignment
Ch 1 Ref 1 Voltage signal
Ch 2 Ref 2 Current signal
6
TDSPWR1 Power Analysis Applications User Manual
Operating Basics
Functional Overview
This section contains descriptions of the basic functions of the Power Analysis
Applications and how to use them. Further details about the basic functions and
descriptions of more advanced features are included in the Reference section.
Starting the Application
You can start the Power Analysis Applications after it has been installed in the
oscilloscope. To start the application, follow these steps:
1. Press SETUP ➞ Select Application (main).
2. Use the general purpose (GP) knob to select hd0, and press SELECT.
3. Use the GP knob to select the TDSPWR1.APP title, as shown in Figure 4,
and press Activate Application (side).
Figure 4: Starting the application
TDSPWR1 Power Analysis Applications User Manual
7
Functional Overview
The application starts up and displays as shown in Figure 5.
Using the Local Help
Figure 5: Power Analysis Applications initial display
The application includes local help information about the measurements modes,
with some explanation of the individual controls.
To display the local help, follow these steps:
1. Press Utility (main) ➞ Help (side). Figure 6 shows the Utility menu.
2. Use the side menu buttons to navigate through the help.
8
TDSPWR1 Power Analysis Applications User Manual
Functional Overview
Using Other Functions
Figure 6: Utility menu
You can switch between the Power Analysis Applications and other oscilloscope
functions. To access primary oscilloscope functions, press the desired front panel
control. To return to the application, push the SHIFT then the APPLICATION
front-panel menu buttons as shown in Figure 7.
Push the SHIFT then the APPLICATION buttons to return to the application.
Figure 7: Returning to the application
TDSPWR1 Power Analysis Applications User Manual
9
Functional Overview
Taking a Measurement
You can set up the application to measure power emission or consumption
characteristics in one of three measurement modes. To do so, follow these steps:
1. To activate the application and select which mode to use, Power and Energy,
Current Harmonics, or Power Factor, Press Measure (main) ➞ Mode (side).
2. Select or specify values for other parameters associated with or required by
the measurement mode. (See the Measurement Descriptions on page 45 for
information about individual measurement parameters.)
3. If you want to change trigger settings or localize the measurement, do so
now. The application defaults to the settings specified in the Trigger menu.
The application warns you if the setup is not adequate for the measurement.
4. Press Control (main). Figure 8 shows the Control menu.
10
Figure 8: The Control menu
5. Press Mode (side) to select Single or Free Run acquisition mode.
The Single option performs the measurement and then stops. The Free Run
option performs the measurement continually.
TDSPWR1 Power Analysis Applications User Manual
Functional Overview
In the event that the measurement requires an external operation to occur
before it may continue, the readout changes to Pause. After fulfilling the
requirements specified in the message box, you must press Continue (side)
to finish the measurement.
6. Press Start (side).
NOTE. Do not change oscilloscope settings while a measurement is being taken.
Doing so can invalidate the measurement.
Do not attempt to execute external GPIB commands to control the oscilloscope
while running the application. Doing so may interrupt the process.
7. Wait for the measurement to complete (Single). You can press the Pause or
Stop side menu buttons to interrupt or stop the measurement. However, the
application will complete the measurement before responding.
In Single mode, when the measurement has successfully completed, the screen
displays the updated measurement data. All measurement processing halts, but
the waveform acquisitions continue to update on the screen.
Viewing the W aveform
Exiting the Application
To view parts of the waveform that are obscured by the measurement display
readout, push the CLEAR MENU button.
The Power and Energy and the Current Harmonics modes place waveforms in
Ref3 and Ref4. If these waveforms are not visible after a measurement, press
MORE ➞ Ref3 (main) and then MORE ➞ Ref4 (main).
To return to the application display, push the SHIFT then the APPLICATION
front-panel menu buttons.
To exit the application, press File Utility (main) ➞ Exit (side).
TDSPWR1 Power Analysis Applications User Manual
11
Functional Overview
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TDSPWR1 Power Analysis Applications User Manual
Tutorial
This tutorial teaches you how to use each of the measurement modes included in
the Power Analysis Applications. Further operating information is located in the
Reference chapter.
Setting Up the Oscilloscope
The tutorial uses the default factory settings to display the waveforms shown in
this section. You must set up your oscilloscope to the default factory settings and
turn off the active waveform on Ch1 before you start these lessons.
To set the oscilloscope to the default factory settings, press SETUP ➞ Recall
Factory Setup (main) ➞ OK Confirm Factory Init (side).
To turn off the display of the active waveform on Ch1, press the WAVEFORM
OFF front-panel button.
Starting the Application
To perform these lessons, the Power Analysis Applications must be installed on
the oscilloscope. For information on how to do this, see Installation on page 3.
To start the application, follow these steps:
1. Press SETUP ➞ Select Application as shown in Figure 4 on page 7.
2. Use the general purpose (GP) knob to select hd0: and press SELECT.
3. Use the GP knob to select TDSPWR1.APP.
4. Press Activate Application (side).
The application starts up and displays its initial screen.
Loading the Reference Waveform Files
The application includes two reference waveform files for use with this tutorial.
Both waveforms were taken from the power supply of a class D EUT.
The Voltage waveform is five cycles of the 50 Hz/230 V power supply. You will
load it as Ref1 and display it on your oscilloscope.
The Current waveform is from the same power supply. You will load it as Ref2
and display it on your oscilloscope.
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Tutorial
To load the reference waveform files, follow these steps:
1. Press WAVEFORM ➞ Recall Wfm to Ref (main) ➞ Recall from file (side).
2. Use the general purpose (GP) knob to select hd0 and press SELECT.
3. Use the GP knob to select WFMS and press SELECT.
4. Use the GP knob to select R1V_50HZ.WFM and press Ref 1 active (side).
5. Press Recall Wfm to Ref (main) ➞ Recall from file (side).
6. Use the GP knob to select R2I_50HZ.WFM and press Ref 2 active (side).
7. Press MORE ➞ Ref 1 (main).
8. Press Ref 2 (main).
9. Press the CLEAR MENU front-panel button to view the waveforms.
Figure 9 shows Ref1 and Ref2 as they should appear on your display.
Ref1, the Voltage waveform
Ref2, the Current waveform
Figure 9: Default tutorial reference waveforms, Ref1 and Ref2
You can work through the tutorial lessons without formatting the waveforms. If
you do, be sure to keep in mind that the waveforms on your display will look
slightly different than the waveforms shown in the figures in this section.
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Tutorial
To scale and reposition Ref1 and Ref2 for easier viewing, follow these steps:
1. Press MORE ➞ Ref 1 (main). Use the VERTICAL SCALE knob to scale
down the waveform and the VERTICAL POSITION knob to move the
waveform farther up the display.
2. Press Ref 2 (main). Use the VERTICAL POSITION knob to move the
waveform farther up the display.
3. Press the CLEAR MENU front-panel button.
Figure 10 shows the scaled and repositioned reference waveforms.
Figure 10: Ref1 and Ref2, scaled and repositioned
4. Push the SHIFT then the APPLICATION front-panel menu buttons to return
to the application.
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Tutorial
Taking a Power and Energy Measurement
In this lesson, you will use the application to calculate the power and energy
waveforms. The calculation is taken from the voltage and current reference
waveforms loaded as Ref1 and as Ref2, respectively.
To become familiar with the Power and Energy mode, follow these steps:
1. To select the Power and Energy mode, press Measure (main) ➞ Power &
Energy (side).
2. To specify the source of the voltage and current waveforms, press Input
Config (main) ➞ V, I Source (side). Select Ref1, 2. The I-Probe Impedance
value is ignored because the vertical units are in Amperes.
Figure 11 shows the Input Config menu with the reference waveforms. The
Ref1 waveform is scaled down and both waveforms are positioned higher
vertically on the display. This makes them easier to read.
16
Figure 11: Input Config setup for the Power and Energy lesson
3. To display the power measurement, press View (main) ➞ Power Wfm (side)
and select ON.
4. To display the energy measurement, press Energy Wfm (side) and select ON.
TDSPWR1 Power Analysis Applications User Manual
Figure 12 shows the View menu.
Tutorial
Figure 12: View menu for the Power and Energy lesson
5. To calculate the power and energy waveforms, press Control (main) ➞ Mode
(side) and select Single. Then press Start (side).
The state of the Control menu (main) will display Control Sequencing while
the application is executing. When the Control menu displays Control
Ready, the application has completed the calculations.
6. Wait for the calculations to complete. A message box appears indicating that
Ref3 contains the Power waveform and that Ref4 contains the Energy
waveform. To display these waveforms, follow these steps:
a. Press the MORE front-panel button.
b. Press Ref3 to display the results of the Power measurement.
c. Press Ref4 to display the results of the Energy measurement.
Figure 13 shows all four reference waveforms.
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Tutorial
Ref3, the Power waveform
Ref4, the Energy waveform
Figure 13: Resulting Ref3 and Ref4 waveforms
You can change the scale and position of the Ref3 and Ref4 waveforms to
make them easier to analyze. Figure 40 on page 47 shows an example of the
four reference waveforms scaled and repositioned on the screen.
7. When you are finished viewing the waveforms, press the WAVEFORM OFF
front-panel button twice to clear the Ref3 and Ref4 waveforms.
8. Press the SHIFT and then the APPLICATION front-panel buttons to return
to the application.
Saving a Setup and Exiting the Application
At some point, you might need to interrupt this tutorial. If you intend on
continuing later, you need to save the oscilloscope and the application setups.
To save the oscilloscope setup, follow these steps:
1. Use the GP knob to select hd0: and press Create Directory (side).
2. Use the GP knob to select the T and press Enter Char (main). A T appears in
the Name: field. Continue selecting and entering letters until the Name: field
says TUT, then select and enter your first and last name initials.
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TDSPWR1 Power Analysis Applications User Manual
Tutorial
3. Press OK Accept (side). A TUTxx directory (where the xx represents your
initials) now exists on the hard disk that you can use with this tutorial.
4. Press Save Current Setup (main) ➞ To File (side).
5. Press Save to Selected File (side). The tutorial setup is saved to the hard disk
in the TUTxx directory and named TEK00000.SET. If you save subsequent
setups, they will be named sequentially by default, such as TEK00001.SET
and TEK00002.SET.
Figure 14 shows a tutorial directory with a saved setup file for each lesson.
Recalling a Setup
Figure 14: Saved setup files on the hard disk
To save the application setup, follow these steps:
1. Press Utility (main) ➞ Save Setup (side).
2. To exit the application, press Utility (main) ➞ Exit (side).
When you are ready to continue with the tutorial, you can recall any saved setup
from your TUTxx directory on the hard disk. You will also need to restart the
application as described on page 13.
To recall the oscilloscope setup, follow these steps:
1. Press SETUP ➞ Recall Saved Setup (main) ➞ From File (side).
2. Use the general purpose (GP) knob to select hd0, and press SELECT.
3. Use the GP knob to select the TEK00000.SET (or other setup) title under the
TUTxx directory and press Recall From Selected File (side).
To recall the application setup, follow these steps:
1. Press Utility (main) ➞ Recall Setup (side).
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Tutorial
2. Recall only the Ref2 waveform as described on page 13 if you plan to
continue with the Current Harmonics Measurement lesson.
Or, recall both the Ref1 and Ref2 waveforms as described on page 13 if you
plan to continue with the Power Factor Measurement lesson.
3. Scale and reposition the waveforms as described on page 15, if you want.
Taking a Current Harmonics Measurement
In this lesson, you will use the application to compare the current harmonic line
emissions of a class D EUT against the IEC 61000-3-2 limit standard. You will
only need to use the Ref2 waveform on Ch2 for this lesson.
To become familiar with the Current Harmonics mode, follow these steps:
1. Press Measure (main) ➞ Current Harmonics (side).
Before starting the measurement, you must configure the application to match
the characteristics of the class D EUT from which the reference waveform was
taken.
Figure 15 shows the Input Config menu with the reference waveforms.
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Figure 15: Input Config setup for the Current Harmonics lesson
TDSPWR1 Power Analysis Applications User Manual
Tutorial
2. To set up the Input Configuration, follow these steps:
a. To specify the source of the voltage and current waveforms, press Input
Config (main) ➞ V, I Source (side) and select Ref1, 2.
b. To specify the frequency of the AC line, press Signal Type (side) and
select 50 Hz Line. This matches the frequency of the EUT from which
the Ref1 and Ref2 reference waveforms were taken.
3. To set up the IEC 61000-3-2 limits table, refer to Figures 16 through 19, and
follow these steps:
a. Press Harmonic Limits (main).
A table displays that contains the default limit values or, if the table was
created in a previous session, the limit values already saved in the
LIM_TAB1 table.
Figure 16 shows a default table of harmonic limits values (not used in
this lesson) and the Config IEC 61000–3–2 (side) menu item.
Figure 16: Default table of harmonic limits
b. Press Config IEC 61000-3-2 (side).
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Tutorial
Figure 17 shows the IEC 61000-3-2 configuration menu. The application
uses this information to build an IEC 61000-3-2 harmonic limits table.
Figure 17: IEC 61000-3-2 configuration for the Current Harmonics lesson
c. Select Equip Class D (side).This matches the equipment class of the
EUT from which the Ref1 and Ref2 reference waveforms were taken.
d. Press Power (Class D only) (side) and use the keypad to enter 150 W.
This matches the power consumed by the EUT from which the Ref1 and
Ref2 waveforms were taken.
e. Press Done.
f. To build the IEC limits table and activate it, press Set All Limits to IEC
Std. IEC 61000–3–2 (side).
Figure 18 shows the new values in the LIM_TAB1 harmonic limits table.
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Tutorial
Figure 18: Harmonic Limits LIM_TBL1 values for the lesson
4. To view the results in a table, press View (main) ➞ View As (side) and
select Table.
5. To view the first 20 harmonics of the results, press Page (side)and select one.
6. To compare the current harmonics of Ref2 against the LIM_TAB1 limits,
press Control (main) ➞ Mode (side) and select Single. Press Con-
trol (main) ➞ Start (side).
The state of the Control menu (main) will display Control Sequencing while
the application is executing.
7. Wait for the comparisons to complete, then view the results.
Figure 19 shows the results. A negative value in the Margin dB column
indicates that the harmonic of the EUT exceeded the limits and therefore
failed the IEC61000-3-2 standard.
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Tutorial
Figure 19: T abular results for the Current Harmonics lesson
8. To view the results in the form of a bar graph, press View Table (main) ➞
View As (side) and select Bar Graph.
9. To retake the measurements, press Control (main) ➞ Mode (side) and select
Single. Then press Control (main) ➞ Start (side).
The state of the Control menu (main) will display Control Sequencing while
the application is executing. When the Control menu displays Control
Ready, the application has completed the limit comparisons.
10. Wait for the comparisons to complete. The results do not automatically
display. To display the results, follow these steps:
a. Press the MORE front-panel button.
b. Press Ref3 to display the results from the EUT as narrow bars.
c. Press Ref4 to display the IEC limits to which the EUT was compared as
wide bars.
d. Change the volts per division to 25.0 V for Ref4.
e. Press Ref1 and then the WAVEFORM OFF front-panel button to clear
the Ref1 waveform from the display.
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TDSPWR1 Power Analysis Applications User Manual
Measured level bar
Standard limit bar
Tutorial
f. Press Ref2 and then the WAVEFORM OFF front-panel button to clear
the Ref2 waveform from the display.
Figure 20 shows the results formatted as a bar graph. The narrow bars
represent the measurement and the wide bars represent the values from the
table. A measured levels bar that is higher than the corresponding limit
levels bar indicates that the harmonic exceeds the standard (the EUT failed
that harmonic).
Figure 20: Bar graph results for the Current Harmonics lesson
11. When you are finished viewing the bar graph, press the WAVEFORM OFF
front-panel button twice to clear the Ref3 and Ref4 waveforms.
12. Press the SHIFT and then the APPLICATION front-panel buttons to return
to the application.
Taking a Power Factor Measurement
In this lesson, you will use the application to measure the RMS voltage and
current, the true and apparent power, and the power factor of a class D EUT.
There are two standard frequencies and a user-defined frequency on which the
application can take the Power Factor measurements.
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Tutorial
Standard Frequency
To become familiar with a standard frequency mode, follow these steps:
1. To select the Power Factor mode, press Measure (main) ➞ Power Factor
(side).
2. Follow steps 7 through 9 on page 14 to display the Ref1 and Ref2 waveforms. Follow steps 1 through 4 on page 15 to scale and reposition the
waveforms.
3. To set up the Input Configuration, follow these steps:
a. To specify the source of the voltage and current waveforms, press Input
Config (main) ➞ V, I Source (side) and select Ref1, 2. The I-Probe
Impedance value is ignored because the vertical units are in Amperes.
b. To specify the frequency of the AC line, press Signal Type (side) and
select 50 Hz Line. This matches the frequency of the EUT from which
the Ref1 and Ref2 reference waveforms were taken.
Figure 21 shows the Input Config menu with the reference waveforms.
26
Figure 21: Input Config setup for the Power Factor lesson
4. To take the measurements, press Control (main) ➞ Mode (side) and select
Single. Then press Control (main) ➞ Start (side).
TDSPWR1 Power Analysis Applications User Manual
The state of the Control menu (main) will display Control Sequencing while
the application is executing. When the Control menu displays Control
Ready, the application has completed the calculations.
5. Wait for the measurements to complete. Figure 22 shows the results.
Tutorial
Figure 22: Results for the Power Factor lesson
User-Defined Frequency
TDSPWR1 Power Analysis Applications User Manual
You can enter a frequency other than the two standard frequencies. In this lesson,
you will enter the value of a standard frequency as if it were a user-defined
frequency to show the differences in the results of the measurement.
To become familiar with a user-defined frequency mode, follow these steps:
1. Push the SHIFT then the APPLICATION front-panel menu buttons to return
to the application.
2. Press Input Config (main) ➞ Signal Type (side) and select User.
3. Press User Frequency (side) and use the keypad to enter 50 Hz. Figure 23
shows the Input Config menu with a user-defined signal frequency of 50 Hz.
4. Press User Freq Tolerance (side) and use the keypad to enter 1.0%. Figure 23
shows the Input Config menu with the tolerance of the user-defined signal
frequency set to 1.0%.
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Tutorial
Figure 23: User-defined signal frequency for the Power Factor lesson
5. To take the measurements, press Control (main) ➞ Mode (side) and select
Single. Then press Control (main) ➞ Start (side).
6. Wait for the measurements to complete, and the results will display as shown
in Figure 24. The last two lines in the results show the user-defined signal
frequency and the calculated frequency.
Figure 24: User-defined frequency results for the Power Factor lesson
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Reference
Menu Structure
Figure 25 shows the relationship of the application menus.
Measure
Power & Energy
Current Harmonics
Power Factor
View
Input Config
Harmonic Limits
Input Config
Input Config V, I Source: Ch1, 2 / Ref1, 2
Power wfm: On/Off
Energy wfm: On/Off
V, I Source: Ch1, 2/Ref1,2
I-Probe Impedance [0.001 ... 0.5, 0.001] ohms
Table Name: LIM_TAB [1 . . . 8, 1]
Select Harmonic [1 . . . 40, 1]
Adjust Limit [0 . . . 10, 10m] A (0=No Spec)
Set All Limits to IEC Std. 61000-3-2
Config IEC 61000-3-2
View as Table / Bar GraphView
V, I Source: Ch1, 2 / Ref1, 2
Signal Type: 60Hz Line / 50Hz Line
I-Probe Ohms vs Freq
I-Probe Impedance [0.001 ... 0.5, 0.001] ohms
Signal Type: 60Hz Line / 50Hz Line / User
User Frequency [1 . . . 10M, 1]Hz
User Freq Tolerance +–[0 . . . 5, 0.1]%
Equip Class: A / B / C / D
Class C Power Factor [0 . . . 1, 0.01]
Class D Power [10 . . . 1k, 1] W
Done
Table Name: OHM_TAB [1 . . . 8, 1]
Select Harmonic [1 . . . 40, 1]
Adjust Impedance [1m . . . 2, 1m]Ohm
Done
Mode Single/Free Run
Control
Utility
Start
Pause
Continue
Stop
Help
Exit
Save Setup
Recall Setup
Default Setup
First Page
Next
Previous
Last Page
Quit
Figure 25: Application menu structure
TDSPWR1 Power Analysis Applications User Manual
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Menu Structure
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TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
This section describes the menus and menu items for the power measurement
modes: Power and Energy, Current Harmonics, and Power Factor.
Saving and Recalling Setups
You can save and recall application menu settings. Figure 26 shows the Utility
menu with the save and recall side menus.
Figure 26: Save Setup and Recall Setup selections in the Utility menu
The save/recall function is controlled from the application Utility menu and
contains the following selections:
H To store the current application settings, press Utility (main) ➞ Save Setup
(side). The file will contain the
stored settings. Once you have saved a setup, that setup will be recalled
whenever you start the Power Analysis Applications. Keep in mind that the
file is not updated automatically.
You must use the Save Setup function to update the file.
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Setup Parameters
NOTE. If you want to save the existing configuration, you must use the Save
Setup feature to store the present application settings.
You can recall the settings in the
file at any time. To do so, press Utility (main) ➞ Recall Setup (side).
H To recall the factory default menu settings, press Utility (main) ➞ Default
Setup (side).
The Power Analysis Applications Save/Recall function is totally independent of
the primary oscilloscope Save/Recall function stored in nonvolatile RAM.
Measuring Power and Energy
The Power and Energy mode displays instantaneous power curves based on the
waveform measurements from the electrical potential in Volts and the electrical
current in Amperes. Figure 27 shows the initial display after selecting this mode.
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Figure 27: Power & Energy initial display
TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
To set up the Power and Energy mode, refer to Figure 28, Figure 29, and follow
these steps:
1. Press View (main). You can use the View menu to define what measurement
to display: power, energy, or both power and energy. Figure 28 shows the
View menu.
Press Power Wfm (side). In the Power Wfm menu item, you can select On to
display the power waveform or Off.
Press Energy Wfm (side). In the Energy Wfm menu item, you can select On
to display the energy waveform or Off.
Figure 28: Power & Energy View menu
2. Press Input Config (main). You can configure the source of input data and
the probe impedance, if need be. A TekProbe, such as the TCP 202, does not
require an impedance value. Figure 29 shows the Input Config menu.
Press V, I Source (side). In the V, I Source menu item, you can select Ch1,2
to measure active data from channels 1 and 2, or Ref 1, 2 to measure
reference waveforms 1 and 2.
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Setup Parameters
Press I-Probe Impedance (side). In this menu item, you can select an
insertion impedance value, such as the voltage to current conversion factor.
The range is from 0.001 ohms to 0.5 ohms in 0.001 increments.
Figure 29: Power & Energy Input Config menu
3. After the measurement is set up, press Control (main) ➞ Start (side).
When the measurement is complete, a message appears indicating that Ref3
contains the Power waveform and that Ref4 contains the Energy waveform.
To display Ref3 and Ref4, refer to step 6 on page 17.
Table 2 lists the waveform names and gives a definition of what each represents.
T able 2: Power and Energy waveform definitions
Waveform name Definition
Source (input)
Ch1/Ref1
Ch2/Ref2
Target (output)
Ref3
Ref4
Voltage
Current
Power
Energy (Integral of power)
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TDSPWR1 Power Analysis Applications User Manual
Figure 40 on page 47 shows an example of the four reference waveforms scaled
and repositioned on the screen.
Measuring Current Harmonics
The Current Harmonics mode compares the harmonic current emissions from the
EUT injected into the public supply system against the limits specified in the
IEC standard 61000-3-2. You can view the results as a table or as a graph.
Figure 30 shows the initial display after selecting this mode.
Setup Parameters
Figure 30: Current Harmonics initial display
To set up the Current Harmonics mode, refer to Figures 31 through 35, and
follow these steps:
1. Press Harmonic Limits (main).
You can use the Harmonic Limits Table menu to set the current limits for
harmonics to the IEC 61000-3-2 standard or to individual limit values.
2. Press Table Name (side) to select one of eight tables, LIM_TAB1 to
LIM_TAB8, if limit values have been created for all eight tables.
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Setup Parameters
Multiple saved tables are most useful for customized limit values. You
should reserve the use of LIM_TAB1 for standard IEC levels.
3. Press Select Harmonic (side) to select a harmonic for limit adjustment.
4. Press Adjust Limit (side) to enter a custom value for the selected harmonic.
36
Figure 31: Harmonic Limits T able menu with default values
5. Press Config IEC 61000–3–2 (side). Figure 32 shows the Config IEC
61000-3-2 menu.
Press Equip Class (side) and match the class of the EUT: A, B, C, or D.
Class A or B EUTs do not need any other configuration.
Class C EUTs require a power factor. Press Class C Power Factor (side) to
select the power factor, or enter the factor using the keypad and press
ENTER. The range is from 0 to 1 in 0.01 increments.
Class D EUTs require a value for Watts consumed. Press Class D Power
(side) and use the GP knob to select the power consumed, or use the keypad
to enter the power consumed. The range is from 10 to 1000 Watts in whole
numbers.
Press Done to return to Harmonic Limits (main).
TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
Figure 32: Config IEC 61000-3-2 configuration menu
6. To set the current limits in the selected limit table to levels dictated by the
Config IEC 61000–3–2 menu, press Harmonic Limits (main) ➞ Set All
Limits to (side).
Figure 33 shows a harmonic limits table for a class D EUT with a total
power consumption of 100 Watts.
TDSPWR1 Power Analysis Applications User Manual
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Setup Parameters
Figure 33: An activated current harmonic limits table
7. Press View (main). You can use the View menu to choose the format of the
results as tabular or graphical. Figure 34 shows the View menu.
Press View As (side). You can select Table to view the results in table form
or Graph to view the results as a bar graph.
The results display in a table and contain the measured levels, limit levels,
and margin for the fundamental and harmonics two through forty (twenty per
page). A negative value in the Margin column indicates that the harmonic
exceeds the standard. (The EUT failed that harmonic.) Measured and limit
currents are given in dBuA units while the margins are given in dB units.
When viewing the results as a graph, the horizontal scale is 2 harmonics per
division and the vertical scale is 50 dBuA per division. The narrow bars
represent the measurement and the wide bars represent the values from the
table. A measured levels bar that is higher than the corresponding limit
levels bar indicates that the harmonic exceeds the standard (the EUT failed
that harmonic).
8. Press View (main) ➞ View Page (side). You can select which page number
to display.
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TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
Figure 34: Current Harmonics View menu
9. Press Input Config (main). You can configure the source of input data and
the cycle frequency of the power line. Figure 35 shows the Input Config
menu.
Press V, I Source (side). You can select Ch1,2 to measure active data from
channels 1 and 2, or Ref 1, 2 to measure reference waveforms 1 and 2.
Press Signal Type (side). You can select the line frequency that matches the
power source, 60 Hz or 50 Hz, or choose user as the type of signal.
TDSPWR1 Power Analysis Applications User Manual
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Setup Parameters
Figure 35: Current Harmonics Input Config menu
10. Press lnput Config (main) ➞ I-Probe R vs Freq (side). Figure 36 shows the
I-Probe R vs Freq configuration menu.
You can use the I-Probe R vs Freq menu to set the transfer impedance of the
probe at each harmonic frequency.
11. Press Table Name (side) to select an active table from the eight available:
OHM_TAB1 through OHM_TAB8. You can specify a unique set of transfer
impedance values or ratios in each table for your specific use.
12. Press Select Harmonic (side) to select a harmonic for transfer impedance
adjustment.
13. Press Adjust R as a) Ohms b) Ratio (side) to enter a custom transfer
impedance for the selected harmonic.
If you are using a TekProbe, you need to set only the ratio of the actual
versus the nominal impedance. The oscilloscope can identify this type of
probe and will automatically apply the value as a ratio. The range of ratios is
from 0.001 to 2.0 in 0.001 increments.
If the probe is not a TekProbe, the value you enter is handled as ohms. The
range is from 0.001 ohms to 2.0 ohms in 0.001 increments.
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TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
Figure 36: I-Probe R vs Freq configuration menu
14. After the measurement is set up, press Control (main) ➞ Start (side).
If you select View As Table, when the measurement is complete, the results
display formatted as a table. Refer to Figure 19 on page 24 for an example of
results in a table form
If you select View As Bar Graph, when the comparisons are complete, the
results do not display. To display the bar graphs, follow step 10 on page 24.
Figure 20 on page 25 for an example of the results as a bar graph.
Table 3 lists the waveform names and gives a definition of what each represents.
T able 3: Current Harmonics waveform definitions
Waveform name Definition
Source (input)
Ch2/Ref2 Current
Target (output)
Ref3
Ref4
Measured level
Standard limit
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Setup Parameters
Measuring Power Factors
The Power Factor mode displays the RMS values for the voltage and current, the
true power, the apparent power, and the power factor of an EUT. Figure 37
shows the initial display after selecting this mode.
42
Figure 37: Power Factor initial display
To set up the Power and Energy mode, refer to Figure 38, and follow these steps:
1. Press Input Config (main). You can configure the source of input data and
the probe impedance, if need be. Figure 38 shows the Input Config menu.
Press V, I Source (side). In the V, I Source menu item, you can select Ch1,2
to measure active data from channels 1 and 2, or Ref 1, 2 to measure
reference waveforms 1 and 2.
Press I-Probe Impedance (side). In the I-Probe Impedance menu item, you
can select an insertion impedance value, such as the voltage to current
conversion factor. A TekProbe does not require an impedance value. The
range is from 0.001 to 0.5 ohms in 0.001 increments.
Press Signal Type (side). In the Signal Type menu item, you can select from
one of two standard line frequencies, 50 Hz or 60 Hz, or a User frequency.
TDSPWR1 Power Analysis Applications User Manual
Setup Parameters
Press User Frequency (side). If User is selected as the Signal Type, you can
enter the frequency of your EUT. The range is from 1 Hz to 1 MHz in 1.0 Hz
increments.
Press User Freq Tolerance (side). You can define a relative margin above and
below the user frequency in which the application will search before taking
the measurement. The margin is from 0 to "5% in 0.1 increments. If you
are sure that the user-defined frequency is correct, enter 0 to cancel the
frequency search.
Figure 38: Power Factor Input Config menu
2. After the measurement is set up, press Control (main) ➞ Start (side).
When the measurement is complete, the results display. Refer to Figure 22
on page 27 for an example of the results from a Power Factor measurement
for a standard frequency. Refer to Figure 24 on page 28 for an example of the
results for a User Signal Type frequency.
TDSPWR1 Power Analysis Applications User Manual
43
Setup Parameters
Localizing Measurements
You can control the amount of data to measure by adjusting the Record Length
or Horizontal Scale in the oscilloscope horizontal menu. By specifying both the
trigger position, the starting point and the total length of the measurement, you
can effectively size the area of interest.
44
TDSPWR1 Power Analysis Applications User Manual
Measurement Descriptions
This section contains descriptions of the Power Analysis Applications measurements. The descriptions include information about how to take the measurement
and information about the algorithm used to perform the measurement operation.
There are three measurement modes: Power and Energy, Current Harmonics, and
Power Factor. Figure 39 shows an example of the results for each mode.
Figure 39: Examples of the results for all three measurements
Measurements will continuously update if you select the Free Run mode in the
Control menu before starting the measurement. If you do not select the Free Run
mode and want to take another measurement, press Start (side) again.
Warning Messages
All power analysis measurements provide a warning if the input conditions do
not support accurate measurements. For example, the Current Harmonics
measurement warns you if the time/div is not 2 ms and the record length is less
than 2500.
TDSPWR1 Power Analysis Applications User Manual
45
Measurement Descriptions
Power and Energy Measurements
The Power and Energy mode requires two waveforms; a voltage waveform
(electrical potential measured in Volts) and a current waveform (measured in
Amperes), and calculates the instantaneous power and energy curves from them.
Definition
Procedure
The Power and Energy waveforms are calculated using the following equations:
p(n) + v(n) @ i(n)
n
ȍ
e(n) +
Where: n is the sampled data waveform index
To set up the oscilloscope, use the following guidelines:
1. The voltage signal is on Ch1 or Ref1; the current signal is on Ch2 or Ref2.
2. The vertical scale for the voltage and current signals must be set so that they
do not exceed the vertical range of the TDS oscilloscope.
p(m)
m+1
v is the electrical potential across an EUT
i is the electrical current through an EUT
p is the power
e is the energy
46
3. When possible, limit the bandwidth (such as to 20 MHz) and acquire data
using the Hi Res mode. This increases the accuracy of the measurement.
4. The time per division must be set small enough to capture sufficient signal
detail and avoid aliasing.
To set up the measurement, from the Power Analysis Application display, follow
these steps:
1. To select the Power and Energy measurement, press Measure (main) ➞
Power & Energy (side).
2. Select the curves that you plan to analyze from the View menu; the Power
waveform and/or the Energy waveform.
TDSPWR1 Power Analysis Applications User Manual
Measurement Descriptions
3. Select the voltage and current waveform sources in the Input (main) ➞
V, I Source (side).
4. If you want to localize the measurement, do so now. The application defaults
to the settings specified in the Trigger menu.
5. Press Control (main) ➞ Start (side) to start the measurement.
6. Wait for the measurement to complete, and display the waveform of interest:
the Power waveform as Ref3 and/or the Energy waveform as Ref4. For
details on how to display Ref3 and Ref4, refer to step 6 on page 17.
Figure 40 shows an example of the reference and resulting waveforms scaled
and repositioned for easier analysis.
Figure 40: Power and Energy measurement results
Test Methodology
TDSPWR1 Power Analysis Applications User Manual
To take the Power and Energy measurement, the application calculates the power
and energy as defined for the entire voltage and current waveforms.
47
Measurement Descriptions
Current Harmonics Measurements
Definition
The Current Harmonics mode measures the RMS magnitude of a current
th
component who’s frequency lies in the n
frequency, w
. This mode calculates the harmonic current emissions injected
line
harmonic of the fundamental line
into the public supply system, and compares the results to limits specified in the
IEC standard 61000-3-2, part 3.
You can view the measurement results as a table or as a bar graph.
th
A current harmonics measurement at the n
harmonic of the power line
frequency is based on the following equations:
H(n W
line
Ǹ
) + 2
I (n W
|
line
)
|
Where: H is the RMS current
I is the DFT for a sample data current waveform, defined as:
I(n W
line
) +
N
ȍ
m+1
i(m)e
–j n W
line
(m–1)
i is the current waveform
n is the harmonic number
f
+
line
f
s
@ 2p
f
is the cycle frequency of the power line
line
f
is the sample rate of the sample data
s
W
line
N is the number of samples in the record that contain a whole
number of fundamental power line cycles.
48
TDSPWR1 Power Analysis Applications User Manual
Measurement Descriptions
Procedure
To set up the oscilloscope, use the following guidelines:
1. The current waveform must be present on Ch2 or as Ref2.
2. The time per division must be set to 2 ms.
3. The record length must be set to at least 2500 samples.
4. When possible, limit the bandwidth (such as to 20 MHz) and acquire data
using the Hi Res mode. This increases the accuracy of the measurement.
To set up the measurement, from the Power Analysis Application display, follow
these steps:
1. To select the Current Harmonics measurement, press Measure (main) ➞
Current Harmonics (side).
2. Select the current waveform source as Ch2 or Ref2 in the Input (main) ➞
V, I Source (side).
3. If you want to localize the measurement, do so now. The application defaults
to the settings specified in the Trigger menu.
4. Press Control (main) ➞ Start (side) to start the measurement.
5. Wait for the measurement to complete, then view the results. Figure 19 on
page 24 and Figure 20 on page 25 show examples of the results in the two
different formats.
Test Methodology
The application performs the measurement according to the following algorithm:
1. Imports the current waveform.
2. Checks that the time/div sample rate is equal to 2 ms and that there are at
least 2500 points in the record.
3. Checks that the current waveform meets the required conditions.
4. Performs the DFT at the first through the fortieth harmonic of f
line
.
5. Calculates and compares the current harmonics with the IEC limits table.
TDSPWR1 Power Analysis Applications User Manual
49
Measurement Descriptions
Power Factor Measurements
The Power Factor mode calculates the power factor for a voltage and current
waveform pair. To calculate the power factor, the application must first calculate
the RMS (Volts), RMS (Amperes), True Power, and Apparent Power. The
application also displays these values.
Definition
The Power Factor and related measurements are based on the following
equations:
N
1
V
RMS
I
RMS
P
TRUE
P
APPARENT
P
FACTOR
+
+
Ǹ
+
+ P
Ǹ
1
N
+ V
N
1
N
ȍ
n+1
ȍ
n+1
N
ȍ
n+1
RMS
TRUE
v2(u)
N
i2(n)
i(n) @ v(n)
@ I
RMS
ń P
APPARENT
Where: v is a voltage waveform
50
Procedure
i is a current waveform
N is the number of samples that spans a whole number of signal
cycles
To set up the oscilloscope, use the following guidelines:
1. Set the horizontal scale to a minimum of four divisions (400 samples) per
signal cycle.
To measure 50 or 60 Hz lines, the waveform must contain at least one full
signal cycle.
To measure user-defined lines, the waveform must contain at least two full
signal cycles.
TDSPWR1 Power Analysis Applications User Manual
Measurement Descriptions
2. When possible, limit the bandwidth (such as to 20 MHz) and acquire data
using the Hi Res mode. This increases the accuracy of the measurement.
To set up the measurement, from the Power Analysis Application display, follow
these steps:
1. To select the Power Factor measurement, press Measure (main) ➞ Power
Factor (side).
2. Press Control (main) ➞ Start (side) to start the measurement.
3. Wait for the measurement to complete, then view the results. Figure 22 on
page 27 shows the results for a standard frequency. Figure 24 on page 28
shows the results for a User Signal Type frequency.
Test Methodology
The application performs the measurement according to the following algorithm:
1. Checks that the time/div sample rate is equal to 2 ms and that there are at
least 2500 points in the record.
2. Checks that the current waveform meets the required conditions.
3. For user-defined frequencies, searches for the exact frequency.
4. Verifies the cycle frequency and determines if there is sufficient data to take
the measurement.
5. Calculates the power factor and related measurements.
TDSPWR1 Power Analysis Applications User Manual
51
Measurement Descriptions
52
TDSPWR1 Power Analysis Applications User Manual
Index
Index
A
Accessories, 2
Application
Exiting tutorial lesson, 18
Leaving, 11
Recalling a setup tutorial lesson, 19
Returning, 9
Saving a setup tutorial lesson, 18
Starting, 7
Updates, 2
B
Bar graph
Current Harmonics comparison, 25
C
Changing settings during a measurement, 11
Channel assignments
Current measurements, 5
Power measurements, 6
CLEAR MENU button, 11
Connections
Current Harmonics measurement, 5
Power and Energy measurement, 6
Power Factor measurement, 6
Contacting T ektronix, viii
Continue side menu, 10
Control menu, 10
Conventions, vii
Current Harmonics measurement
Application equations, 48
Connection example, 5
Guidelines, 49
Setup parameters, 35
Tutorial lesson, 20
Current Harmonicst measurement,
Application test method, 49
D
Display readout, Turning off, 11
E
Exiting the application, 11
Tutorial lesson, 18
F
Firmware requirements, 1
Free Run acquisition mode, 10, 45
G
GPIB commands, 11
H
Help, online, 8
I
Installation, application, 3
L
Leaving the application, 11
Lessons, 13
Loading, reference waveforms, 14
Localizing a measurement, 44
M
Measure menu, 10
Measurement
Application equations
Current Harmonics, 48
Power and Energy, 46
Power Factor, 50
Application test methods
Current Harmonics, 49
Power and Energy, 47
Power Factor, 51
Continue, 10
TDSPWR1 Power Analysis Applications User Manual
53
Index
Descriptions, 45
Guidelines
Current Harmonics, 49
Power and Energy, 46
Power Factor, 50
Lessons, 13
Localizing, 44
Oscilloscope changes, 11
Pause, 10
Power and Energy, 48, 50
Standard, 45
Starting, 10
Turning off display, 11
Memory , Requirements, 1
Menu
Control, 10
Overview, 29
Messages, W arning, 45
O
Online help, 8
Oscilloscope compatibility, 1
P
Pause side menu, 10
Power and Energy measurement
Application equations, 46
Application test method, 47
connection example, 6
Guidelines, 46
Setup parameters, 32
Tutorial lesson, 16
Power and Energy mode, 48, 50
Power Factor measurement
Application equations, 50
Application test method, 51
connection example, 6
Guidelines, 50
Setup parameters, 42
Tutorial lesson, 25
Standard frequency, 26
User-defined frequency, 27
Power Harmonics mode, measurement example, 20
Probes, recommended
Current, 5
Differential voltage, 6
Product
Compatibility, 1
Requirements, 1
Restrictions, 1
Updates, 2
Downloading, 4
Product description, 1
Q
Quitting the application, 11
R
Readout, Turning off, 1 1
Recalling a setup, 31
Tutorial lesson, 19
Reference waveforms, loading, 14
S
Saving a setup, 31
Tutorial lesson, 18
Serial number requirements, 1
Setup parameters
Current Harmonics measurement, 35
Power and Energy measurement, 32
Power Factor measurement, 42
Setups
Recalling, 31
Saving, 31
Single acquisition mode, 10
Standard measurements, 45
Starting
Application, 7
Measurement, 10
T
tdspwr1.ini file, 31
T echnical support, viii
T ektronix, contacting, viii
T ektronix, contacting, viii
T erms, vii
Tutorial, 13
Current Harmonics measurement, 20
Current waveform source, 13
Exiting the application, 18
Power and Energy measurement, 16
Power Factor measurement, 25
Standard frequency, 26
User-defined frequency, 27
Recalling a setup, 19
Ref1 waveform, 14
Ref2 waveform, 14
54
TDSPWR1 Power Analysis Applications User Manual
Index
Ref3 waveform, 18
Ref4 waveform, 18
Saving a setup, 18
Voltage waveform source, 13
V
Viewing obscured parts of the waveform, 11
W
Warning messages, 45
Waveform, Viewing obscured portions, 1 1
Waveforms
Repositioning, 15
Scaling, 15
Web site, 2
TDSPWR1 Power Analysis Applications User Manual
55
Index
56
TDSPWR1 Power Analysis Applications User Manual
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