Tektronix PS280, PS283 User Manual
User Manual
PS280 & PS283
DC Power Supplies
070-8355-03
Copyright T ektronix, Inc. 1991. All rights reserved.
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.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
Tektronix warrants that this product will be free from defects in materials and
workmanship for a period of one (1) year 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.
Table of Contents
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing the Power Supply for Use 2. . . . . . . . . . . . . . . . . . . . .
Front Panel 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On the Instrument 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Constant Voltage/Constant Current Crossover 9. . . . . . . . . . . . .
Setting the Current Limit 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T est Modes 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Independent Modes 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tracking Modes 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A: Specifications 25. . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing for Shipment 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Replaceable Parts 33. . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PS280 & PS283 User Manual
i
T able of Contents
List of Figures
Figure 1: Line Voltage Selectors, Power Input,
and Fuse Locations 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2: PS280 or PS283 Front Panel 4. . . . . . . . . . . . . . . . . . .
Figure 3: Constant Voltage/Constant Current Crossover 10. . . . . .
Figure 4: Independent Floating Application 12. . . . . . . . . . . . . . .
Figure 5: Independent Common Ground-Referenced
Application 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6: Independent Ground-Referenced Split Application 15. .
Figure 7: Three Ground-Referenced Negative Power Supplies 16
Figure 8: Three Ground-Referenced Positive Power Supplies 17.
Figure 9: Independent Positive Stacked Application 18. . . . . . . . .
Figure 10: Independent Negative Stacked Application 19. . . . . . .
Figure 11: Series Tracking Inside the PS280 or PS283 20. . . . . . .
Figure 12: Series Tracking Application 21. . . . . . . . . . . . . . . . . . .
Figure 13: Parallel Tracking Inside the PS280 or PS283 23. . . . .
Figure 14: Parallel Tracking Application 24. . . . . . . . . . . . . . . . .
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PS280 & PS283 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.
Injury Precautions
Use Proper Power Cord
T o avoid fire hazard, use only the power cord specified for this
product.
Avoid Electric Overload
T o avoid electric shock or fire hazard, do not apply a voltage to a
terminal that is outside the range specified for that terminal.
Ground the Product
This product is grounded through the grounding conductor of the
power cord. T o avoid electric shock, the grounding conductor must
be connected to earth ground. Before making connections to the
input or output terminals of the product, ensure that the product is
properly grounded.
Do Not Operate Without Covers
T o avoid electric shock or fire hazard, do not operate this product
with covers or panels removed.
Use Proper Fuse
T o avoid fire hazard, use only the fuse type and rating specified for
this product.
PS280 & PS283 User Manual
iii
General Safety Summary
Do Not Operate in Wet/Damp Conditions
T o avoid electric shock, do not operate this product in wet or damp
conditions.
Do Not Operate in Explosive Atmosphere
T o avoid injury or fire hazard, do not operate this product in an
explosive atmosphere.
Product Damage Precautions
Use Proper V oltage Setting
Before applying power, ensure that the line selector is in the proper
position for the power source being used.
Provide Proper Ventilation
T o prevent product overheating, provide proper ventilation.
Do Not Operate With Suspected Failures
If you suspect there is damage to this product, have it inspected by
qualified service personnel.
Safety Terms and Symbols
Terms in This Manual
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that
could result in injury or loss of life.
iv
PS280 & PS283 User Manual
General Safety Summary
CAUTION. Caution statements identify conditions or practices that
could result in damage to this product or other property.
Terms on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you
read the marking.
WARNING indicates an injury hazard not immediately accessible as
you read the marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Protective Ground
(Earth) T erminal
Certifications and Compliances
CSA Certified Power Cords
CSA Certification includes the products and power cords appropriate
for use in the North America power network. All other power cords
supplied are approved for the country of use.
PS280 & PS283 User Manual
ATTENTION
Refer to
Manual
Double
Insulated
v
General Safety Summary
vi
PS280 & PS283 User Manual
Getting Started
The Tektronix PS280 or PS283 Laboratory DC Power Supply is a
multifunction bench or portable instrument. This regulated power
supply provides a fixed 5 V output for powering logic circuits and
two variable outputs for a wide variety of test and experimental uses.
The PS280 or PS283 contains two identical, independently adjustable
DC power supplies that you can vary from 0 to 30 V. The current on
the PS280 variable power supplies varies from 0 to 2 A. The current
on the PS283 variable power supplies varies from 0 to 1 A. In all
other respects the instruments are identical. Unless otherwise noted,
descriptions and procedures in this manual apply to both instruments.
Front panel switches select one of three modes of operation:
H Independent — In this mode, the output voltage and current of
each supply can be controlled independently.
H Series — In this tracking mode, the variable outputs are
connected in series, and the controls of the master power supply
adjust the voltages or currents of both power supplies. Series
mode allows the power supplies to be varied from 0 to 60 V at 0
to 2 A for the PS280, or 0 to 1 A for the PS283.
H Parallel — In this tracking mode, the variable outputs are
connected in parallel, and the controls of the master power supply
adjust the voltages or currents of both power supplies. Parallel
mode allows the power supplies to be varied from 0 to 4 A for the
PS280 at 0 to 30 V, or from 0 to 2 A at 0 to 30 V for the PS283.
PS280 & PS283 User Manual
1
Getting Started
Preparing the Power Supply for Use
Check the following items prior to operating the Laboratory DC
Power Supply for the first time (see Figure 1 for locations of items 1
through 3):
Figure 1: Line Voltage Selectors, Power Input, and Fuse Locations
1
3
2
CAUTION. To prevent damage to the instrument, set the line voltage
selectors to the proper voltage setting and install the correct line
voltage fuse before operating the equipment.
1. Set the line voltage selectors to the input line voltage. These
selectors connect internal wiring for various line voltages. This
product is intended to operate from a power source that does not
supply more than 250 V
between either supply conductor and ground. For line voltage
ranges, refer to Appendix A: Specifications on page 25.
WARNING. To prevent electrical shock, unplug the power cord and
disconnect the test leads from the circuit before checking or
replacing the fuse.
2. Check that the correct line fuse is installed. The line fuse
provides protection if the equipment malfunctions or an overload
2
between the supply conductors or
RMS
PS280 & PS283 User Manual
Getting Started
occurs. Refer to Appendix C: Replaceable Parts on page 33 for
fuse part numbers.
WARNING. To prevent electrical shock, connect the power cord to a
properly grounded power source. The outside (ground) of this
connector is connected through the equipment to the power source
ground. Do not remove the ground lug from the power cord for any
reason.
3. Connect the input power cord. Use only the power cords specified
for this equipment. Refer to Appendix C: Replaceable Parts on
page 33 for power cord part numbers.
PS280 & PS283 User Manual
3
Getting Started
Front Panel
Figure 2 shows the front-panel controls, connectors, and indicators
with brief descriptions following the figure.
13456 8
Figure 2: PS280 or PS283 Front Panel
1. LED Display. Lights when the instrument is turned on. The
numbers indicate the voltage or current produced by the left
variable power supply.
27
1918151211 13 17 219
20161410
22
2. AMPS/VOLTS Switch. This switch selects whether the LED
display for the left variable power supply shows the current or the
voltage. If the switch is pushed to the left, the display shows the
current. If the switch is pushed to the right, the display shows the
voltage.
4
PS280 & PS283 User Manual
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