Tektronix Power Supply PS280 User Manual

User Manual  
PS280 & PS283  
DC Power Supplies  
070-8355-03  
 
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preparing the Power Supply for Use . . . . . . . . . . . . . . . . . . . . .  
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Turning On the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1
2
4
8
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Constant Voltage/Constant Current Crossover . . . . . . . . . . . . .  
Setting the Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Test Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Independent Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Tracking Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
9
9
10  
11  
11  
20  
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .  
25  
Appendix B: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preparing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
29  
29  
29  
30  
Appendix C: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .  
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
33  
33  
33  
PS280 & PS283 User Manual  
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Table of Contents  
List of Figures  
Figure 1: Line Voltage Selectors, Power Input,  
and Fuse Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 2: PS280 or PS283 Front Panel . . . . . . . . . . . . . . . . . . .  
Figure 3: Constant Voltage/Constant Current Crossover . . . . . .  
Figure 4: Independent Floating Application . . . . . . . . . . . . . . .  
Figure 5: Independent Common Ground-Referenced  
2
4
10  
12  
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 6: Independent Ground-Referenced Split Application . .  
Figure 7: Three Ground-Referenced Negative Power Supplies  
Figure 8: Three Ground-Referenced Positive Power Supplies .  
Figure 9: Independent Positive Stacked Application . . . . . . . . .  
Figure 10: Independent Negative Stacked Application . . . . . . .  
Figure 11: Series Tracking Inside the PS280 or PS283 . . . . . . .  
Figure 12: Series Tracking Application . . . . . . . . . . . . . . . . . . .  
Figure 13: Parallel Tracking Inside the PS280 or PS283 . . . . .  
Figure 14: Parallel Tracking Application . . . . . . . . . . . . . . . . .  
14  
15  
16  
17  
18  
19  
20  
21  
23  
24  
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ii  
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  
To avoid fire hazard, use only the power cord specified for this  
product.  
Avoid Electric Overload  
To 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. To 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  
To avoid electric shock or fire hazard, do not operate this product  
with covers or panels removed.  
Use Proper Fuse  
To avoid fire hazard, use only the fuse type and rating specified for  
this product.  
PS280 & PS283 User Manual  
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General Safety Summary  
Do Not Operate in Wet/Damp Conditions  
To avoid electric shock, do not operate this product in wet or damp  
conditions.  
Do Not Operate in Explosive Atmosphere  
To avoid injury or fire hazard, do not operate this product in an  
explosive atmosphere.  
Product Damage Precautions  
Use Proper Voltage Setting  
Before applying power, ensure that the line selector is in the proper  
position for the power source being used.  
Provide Proper Ventilation  
To 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.  
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iv  
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:  
Double  
Insulated  
DANGER  
High Voltage  
Protective Ground  
(Earth) Terminal  
ATTENTION  
Refer to  
Manual  
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  
v
 
General Safety Summary  
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vi  
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):  
1
3
2
Figure 1: Line Voltage Selectors, Power Input, and Fuse Locations  
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 the supply conductors or  
RMS  
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  
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2
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.  
1
2
3 4 5 6  
7
8
9
10  
11 12  
13 14  
15  
16 17 18 19 20 21 22  
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.  
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.  
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4
Getting Started  
3. AMPS Indicator. Lights when AMPS is selected with the  
AMPS/VOLTS switch for the left variable power supply.  
4. VOLTS Indicator. Lights when VOLTS is selected with  
AMPS/VOLTS switch for the left variable power supply.  
5. AMPS Indicator. Lights when AMPS is selected with the  
AMPS/VOLTS switch for the right variable power supply.  
6. VOLTS Indicator. Lights when VOLTS is selected with  
AMPS/VOLTS switch for the right variable power supply.  
7. AMPS/VOLTS Switch. This switch selects whether the LED  
display for the right 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.  
8. LED Display. Lights when the instrument is turned on. The  
numbers indicate the voltage or current produced by the right  
variable power supply.  
9. POWER Button. Turns on the instrument when pressed. When  
pressed again, it turns off the instrument.  
10. CURRENT Knob. Use this control to set the output current for  
the right, variable power supply. If the instrument is in a tracking  
mode, the left power supply is the slave and the CURRENT  
knob has no effect.  
11. C.C. Indicator. If this is lighted, the left variable power supply is  
producing a constant current. See Figure 3 on page 10 for an  
illustration of the constant voltage/constant current cross-  
over point.  
12. C.V. Indicator. If this is lighted, the left variable power supply is  
producing a constant voltage. See Figure 3 on page 10 for an  
illustration of the constant voltage/constant current cross-  
over point.  
PS280 & PS283 User Manual  
5
 
Getting Started  
13. Output Terminals. These terminals for the left, variable power  
supply allow you to plug in the test leads as follows:  
H
The red terminal on the right is the positive polarity output  
terminal. It is indicated by a + sign above it.  
H The black terminal on the left is the negative polarity output  
terminal. It is indicated by a – sign above it.  
H The green terminal in the middle is the earth and chassis  
ground.  
14. VOLTAGE Knob. Allows you to set the output voltage for the  
left variable power supply. If the instrument is in a tracking  
mode, the left power supply is the slave and the VOLTAGE knob  
has no effect.  
15. TRACKING Buttons. These buttons select the test mode of the  
instrument. The PS280 or PS283 features two tracking modes:  
series and parallel. If both push-button switches are disengaged  
(out), the two variable power supplies operate independently. If  
the left switch is pushed in, the instrument operates in series  
mode. If both switches are pushed in, the instrument operates in  
parallel mode.  
In series mode, the master power supply controls the voltage for  
both power supplies, which can then range from 0 to 60 V. Refer  
to Series on page 20 for further details.  
In parallel mode, the master power supply controls both the  
voltage and the current for both power supplies. The current can  
then range from 0 to 4 A (0 to 2 A for the PS283). Refer to  
Parallel on page 22 for further details.  
16. CURRENT Knob. Use this control to set the output current for  
the right, variable power supply. If the instrument is in a tracking  
mode, the right power supply is the master and the CURRENT  
knob affects both variable power supplies.  
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6
Getting Started  
17. Output Terminals. These terminals for the right, variable power  
supply allow you to plug in the test leads as follows:  
H
The red terminal on the right is the positive polarity output  
terminal. It is indicated by a plus (+) sign above it.  
H The black terminal on the left is the negative polarity output  
terminal. It is indicated by a minus (–) sign above it.  
H The green terminal in the middle is the earth and chassis  
ground.  
18. C.C. Indicator. If this is lighted, the power supply is producing a  
constant current. See Figure 3 on page 10 for an illustration of the  
constant voltage/constant current crossover point.  
19. C.V. Indicator. If this is lighted, the power supply is producing a  
constant voltage. See Figure 3 on page 10 for an illustration of  
the constant voltage/constant current crossover point.  
20. VOLTAGE Knob. Allows you to set the output voltage for the  
right variable power supply. If the instrument is in a tracking  
mode, the right power supply is the master and the VOLTAGE  
knob affects both variable power supplies.  
21. Output Terminals. These terminals for the 5 V FIXED power  
supply allow you to plug in the test leads as follows:  
H The red terminal on the right is the positive polarity output  
terminal.  
H The black terminal on the left is the negative polarity output  
terminal.  
22. The overload indicator lights when the current on the 5 V FIXED  
power supply becomes too large.  
PS280 & PS283 User Manual  
7
 
Getting Started  
Turning On the Instrument  
After you have ensured that the PS280 or PS283 is set up for the  
proper line voltage and has the proper fuse (refer to Preparing the  
Power Supply for Use on page 2), you are ready to turn it on.  
CAUTION. To avoid damaging the PS280 or PS283, do not use it  
when the ambient air temperature exceeds 40° C. Also, allow  
adequate space at the rear of the instrument to permit the heat sink  
to radiate heat.  
1. Ensure that the POWER button is disengaged (out) and that the  
instrument is turned off.  
2. Plug the power cord into an appropriate power source.  
3. Turn both VOLTAGE knobs counterclockwise to the minimum  
setting.  
4. Press the POWER button. The LED displays light up.  
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8
Reference  
This section tells how to set the PS280 or PS283 current limit. It also  
explains the constant voltage/constant current crossover characteris-  
tic of the instrument. Finally, the section includes procedures for  
using the instrument in both independent and tracking modes and  
provides examples of a variety of applications.  
Constant Voltage/Constant Current Crossover  
The PS280 or PS283 DC Power Supply features a constant  
voltage/constant current automatic crossover. This feature permits  
continuous operation in the transition from constant-voltage mode to  
constant-current mode as the load changes. The intersection of the  
constant-current and constant-voltage modes is called the crossover  
point. Figure 3 on page 10 shows the relationship between the load  
and the crossover point.  
For example, if the load is such that the power supply is operating in  
constant-voltage mode, the PS280 or PS283 provides a regulated  
output voltage. The output voltage remains constant as the load  
increases until the preset current limit is reached. Then the crossover  
occurs. At that point, the output current becomes constant and the  
output voltage drops in proportion to further load increases.  
Crossover is indicated by the front panel red C.C. and green C.V.  
indicator lights. If the C.V. indicator is lighted, the instrument is  
operating in constant-voltage mode. If the C.C. indicator is lighted,  
the instrument is operating in constant-current mode.  
Crossover from the constant-current mode to the constant-voltage  
mode also occurs automatically in response to a decrease in load. For  
example, suppose you are charging a 12 V battery. Initially, the open  
circuit voltage of the power supply is preset for 13.8 V. A low battery  
places a heavy load on the power supply, and it operates in  
constant-current mode. You adjust the instrument to charge the  
battery at the rate of 1 A. As the battery becomes charged and its  
voltage approaches 13.8 V, the load decreases to the point where the  
battery no longer demands the full 1 A charging rate. The PS280 or  
PS283 then crosses over to constant-voltage mode.  
PS280 & PS283 User Manual  
9
 
Reference  
V
O
Constant Current  
Range  
Maximum  
Crossover Point  
Output  
Voltage  
Constant  
Voltage  
Range  
I
O
Maximum  
Output Current  
Figure 3: Constant Voltage/Constant Current Crossover  
Setting the Current Limit  
Before you begin using the PS280 or PS283 to power a device, you  
should set its current limit lower than the maximum safe current for  
the device to be powered.  
CAUTION. In order to avoid damaging your device with a current  
overload, set the current limit on the PS280 or PS283 before you  
connect it to your device.  
1. Determine the maximum safe current for the device to be  
powered.  
2. With the test lead, temporarily short the positive and the negative  
output terminals of the power supply together.  
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10  
Reference  
3. Rotate the VOLTAGE knob away from zero sufficiently to light  
the C.C. indicator.  
4. Set the meter selection switch to AMPS so that the LED display  
shows the current.  
5. Adjust the CURRENT knob for the desired current limit.  
6. Read the value shown on the LED display. This is your preset  
current limit. Do not increase the current control setting.  
7. Remove the short between the positive and negative output  
terminals.  
You are now ready to power your device.  
Test Modes  
The two variable power supplies on your PS280 or PS283 can be  
operated independently of each other, or the slave supply can track  
the master supply. Below are instructions for operating the  
instrument in independent modes, followed by instructions for  
operating the instrument in series or parallel tracking modes.  
Independent Modes  
In independent mode, any one output of each power supply can be  
connected to any one terminal of another supply or to ground. The  
variable supplies are independently controlled by the front panel  
VOLTAGE and CURRENT control knobs.  
There are three independent modes in which you can operate the  
PS280 or PS283: floating, ground-referenced, and stacked.  
In floating mode, the power supply is not referenced with respect to  
ground.  
In ground-referenced mode, one of the output terminals is grounded,  
providing a fixed reference point for your measurement.  
PS280 & PS283 User Manual  
11  
 
Reference  
In stacked mode, you connect the negative output terminal of one  
variable power supply to the positive output terminal of the other.  
The stacked configuration allows you to test a circuit requiring  
between 30 and 60 V. A stacked configuration can be either floating  
or ground-referenced.  
Floating. In the independently floating mode, each variable power  
supply provides from 0 to 30 V at 0 to 2 A (0 to 1 A for the PS283).  
Figure 4 shows each of the three power supplies connected to a  
separate load.  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 3  
0 to 30 V  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
Load 2  
Load 1  
0 to 30 V  
5 V  
0 to 3 A  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
Figure 4: Independent Floating Application  
The tracking switches are disengaged for independent operation. The  
left voltage and current control knobs control the outputs for the  
slave variable power supply, and the right knobs do the same for the  
master power supply. All outputs are electrically independent.  
To test a circuit in the independently floating mode, follow these  
steps:  
1. Press the POWER button to apply power to the PS280 or PS283.  
2. Rotate the VOLTAGE knob to zero.  
3. Determine the polarity of your device.  
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12  
Reference  
4. Plug one of the test leads into the positive output terminal.  
5. Plug the other test lead into the negative output terminal.  
6. Press POWER to turn off the PS280 or PS283.  
7. Clip the positive test lead to the positive pole of your device.  
8. Clip the negative test lead to the negative pole of your device.  
9. Press POWER to turn on the PS280 or PS283.  
10. Push the AMPS/VOLTS selection switch so that the LED display  
shows either voltage or current, as you want.  
11. Rotate the VOLTAGE knob as desired.  
12. If you are using a preset current limit (see page 10), do not touch  
the CURRENT knobs. Otherwise, rotate the CURRENT knob as  
desired.  
Ground-Referenced. In the independently ground-referenced mode,  
each variable power supply provides from 0 to 30 V referenced with  
respect to ground at 0 to 2 A (0 to 1 A for the PS283). Any one of a  
pair of output terminals, either the positive or the negative, can be  
connected to ground. The FIXED 5 V power supply can also be  
ground-referenced.  
WARNING. In order to avoid grounding the power line, which can  
cause electrical shock, explosion, or fire, isolate the device being  
powered from the line voltage power source when using any  
ground-referenced output configuration from the PS280 or PS283.  
Figure 5 shows an example of a circuit with the FIXED 5 V terminal  
referenced to ground and both the master and slave variable power  
supplies referenced to –5 V.  
PS280 & PS283 User Manual  
13  
 
Reference  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 3  
Load 2  
Load 1  
–5 TO +25 V  
–5 TO +25 V  
–5 V  
3 A  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
Figure 5: Independent Common Ground-Referenced Application  
In this configuration, each of the variable power supplies can be  
varied from –5 V to +25 V (+30 V overall). The GND post becomes  
the relative negative terminal for both variable outputs. Because the  
variable power supplies are referenced to –5 V, the LED display,  
when set to display volts, shows a value that is five volts lower than  
the actual output.  
For example, the LED display indicates:  
H 0 V when the output is –5 V  
H 5 V when the output is 0 V  
H 30 V when the output is 25 V  
Negative 5 V is available between GND and the negative terminal of  
the FIXED 5 V power supply.  
To test a circuit in the independently ground-referenced mode,  
follow these steps:  
1. Turn the POWER off to the PS280 or PS283.  
2. Connect the outputs as shown in Figure 5.  
3. Set both variable supply VOLTAGE controls to the minimum  
setting.  
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14  
Reference  
4. Set both variable supply CURRENT controls to midrange.  
5. Set the AMPS/VOLTS switches for both power supplies to  
display volts.  
6. Turn on the POWER to the PS280 or PS283. The display should  
read 0 V for both variable power supplies. An external meter  
connected across the load or load terminals should read –5 V.  
7. Turn the POWER off to the PS280 or PS283 again.  
8. Connect the device or devices to be tested.  
9. Turn on the POWER to the PS280 or PS283 again. Adjust the  
voltages as needed.  
Figure 6 shows the PS280 or PS283 connected to produce separate  
outputs of +5 V from the FIXED power supply, 0 to +30 V from the  
slave variable power supply, and 0 to –30 V from the master variable  
power supply. In this configuration, the red output terminal of the  
master variable power supply is the negative reference terminal  
because it is directly connected to the ground terminal.  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 3  
Load 2  
Load 1  
5 V  
0 to 3 A  
0 to +30 V  
0 to –30 V  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
Figure 6: Independent Ground-Referenced Split Application  
PS280 & PS283 User Manual  
15  
 
Reference  
To test a circuit in a independent ground-referenced split application  
mode, follow these steps:  
1. Turn the POWER off to the PS280 or PS283.  
2. Connect the outputs as shown in Figure 6.  
3. Set both variable supply VOLTAGE controls to the minimum  
setting.  
4. Set both variable supply CURRENT controls to midrange.  
5. Turn on the POWER to the PS280 or PS283.  
6. Set the desired voltages for both variable power supplies.  
7. Turn the POWER off to the PS280 or PS283 again.  
8. Connect the device or devices to be tested.  
9. Turn on the POWER to the PS280 or PS283 again. If necessary,  
readjust the voltages.  
Figure 7 shows the configuration for three ground-referenced  
negative power supplies.  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 2  
Load 1  
–5 V  
Load 3  
0 to –30 V  
0 to –30 V  
Figure 7: Three Ground-Referenced Negative Power Supplies  
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16  
Reference  
Figure 8 shows the configuration for three ground-referenced  
positive power supplies.  
SLAVE  
MASTER  
GND  
5V FIXED 3A  
-
GND  
+
-
+
Load 3  
Load 2  
Load 1  
5 V  
0 to 3 A  
0 to 30 V  
0 to 30 V  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
0 to 2 A (PS280)  
0 to 1 A (PS283)  
Figure 8: Three Ground-Referenced Positive Power Supplies  
Stacked. In the independently stacked mode, the variable power  
supplies are connected and provide from 0 to 60 V at 0 to 2 A (0 to  
1 A for the PS283).  
Figure 9 on page 18 shows the PS280 or PS283 connected in a  
stacked manner to produce a variable output of 0 to +60 V  
ground-referenced. The FIXED power supply produces –5 V,  
ground-referenced. In this configuration, the red output terminal of  
the master variable power supply is the negative reference terminal  
because it is directly connected to the ground terminal.  
PS280 & PS283 User Manual  
17  
 
Reference  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 2  
Load 1  
–5 V  
0 to +60 V  
Figure 9: Independent Positive Stacked Application  
To test a circuit in the independently stacked mode, follow these  
steps:  
1. Turn the POWER off to the PS280 or PS283.  
2. Connect the outputs as shown in Figure 9.  
3. Set both variable supply VOLTAGE controls to the minimum  
setting.  
4. Set both variable supply CURRENT controls to midrange.  
5. Turn on the POWER to the PS280 or PS283.  
6. Set the desired voltage. Observe the LED display; the total output  
is the sum of both voltage readings.  
7. Turn the POWER off to the PS280 or PS283 again.  
8. Connect the device or devices to be tested.  
9. Turn on the POWER to the PS280 or PS283 again. If necessary,  
readjust the voltages.  
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Reference  
Figure 10 shows a stacked application in which you have a 0 to  
–60 V output from the variable power supplies and a +5 V output  
from the FIXED power supply.  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 2  
Load 1  
+5 V  
0 to –60 V  
Figure 10: Independent Negative Stacked Application  
PS280 & PS283 User Manual  
19  
 
Reference  
Tracking Modes  
There are two tracking modes in which you can operate the PS280 or  
PS283: series and parallel.  
Series. In series mode, the positive output terminal of the master  
variable power supply is internally connected to the negative output  
terminal of the slave power supply. This connection allows the  
PS280 or PS283 to produce 0 to 60 V at 0 to 2 A (0 to 1 A for the  
PS283).  
When you place the PS280 or PS283 in series mode, the output  
terminals are hooked together internally as shown in Figure 11.  
MASTER  
SLAVE  
Figure 11: Series Tracking Inside the PS280 or PS283  
The voltage knob for the master variable power supply controls the  
voltage for both variable power supplies. Using the master voltage  
control, the maximum slave supply voltage is automatically set to the  
same value as the master supply.  
To test a circuit in the series tracking mode, follow these steps:  
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20  
Reference  
1. Turn the POWER off to the PS280 or PS283.  
2. Connect the outputs as shown in Figure 12.  
INTERNAL  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 1  
0 to +60 V  
Figure 12: Series Tracking Application  
3. Set the PS280 or PS283 to series tracking mode by pressing the  
left TRACKING button. Make sure that the right TRACKING  
button is released (out).  
4. Set the master AMPS/VOLTS switch to the voltage metering  
position. Set the slave AMPS/VOLTS switch to the current  
metering position. This allows you to simultaneously monitor  
both current and voltage.  
NOTE. In series tracking mode, the output voltage is double the value  
displayed on the voltage metering LED display, because both  
supplies are producing the same voltage.  
5. Set the slave CURRENT knob fully clockwise.  
6. Set the current limit using the master CURRENT knob. (Refer to  
Setting the Current Limit on page 10.)  
PS280 & PS283 User Manual  
21  
 
Reference  
NOTE. In series tracking mode, the current flowing through the two  
supplies must be equal. Therefore, the maximum current limit is the  
lower of the values set by the two current control knobs.  
7. Turn on the POWER to the PS280 or PS283.  
8. Adjust the output voltage to the desired level using the master  
VOLTAGE knob.  
9. Turn the POWER off to the PS280 or PS283 again.  
10. Connect the device or devices to be tested.  
11. Turn on the POWER to the PS280 or PS283 again. Readjust the  
voltages if necessary.  
NOTE. The 5 V FIXED supply can be independently grounded or  
allowed to float.  
Parallel. In parallel tracking mode, the positive output terminals of  
both variable power supplies are internally connected, and the  
negative output terminals of both variable power supplies are  
internally connected. These connections allow the PS280 or PS283 to  
produce 0 to 30 V at 0 to 4 A (0 to 2 A for the PS283).  
When you place the PS280 or PS283 in parallel mode, the output  
terminals are hooked together internally as shown in Figure 13.  
The master power supply’s VOLTAGE and the CURRENT knobs  
control the voltage and current for both variable power supplies.  
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22  
Reference  
MASTER  
SLAVE  
Figure 13: Parallel Tracking Inside the PS280 or PS283  
To test a circuit in the parallel tracking mode, follow these steps:  
1. Turn the POWER off to the PS280 or PS283.  
2. Connect the outputs as shown in Figure 14 on page 24.  
3. Set the PS280 or PS283 to parallel tracking mode by pressing  
both tracking buttons.  
4. Set the master AMPS/VOLTS switch to the voltage metering  
position, and set the slave AMPS/VOLTS switch to the current  
metering position. This allows you to simultaneously monitor  
both current and voltage.  
NOTE. In parallel tracking mode, the output current is double the  
value displayed on the current metering LED display, because both  
supplies are producing the same amount of current.  
5. Turn on the POWER to the PS280 or PS283.  
6. Set the current limit using the master CURRENT knob. (Refer to  
Setting the Current Limit on page 10.)  
PS280 & PS283 User Manual  
23  
 
Reference  
INTERNAL  
SLAVE  
GND  
MASTER  
GND  
5V FIXED 3A  
-
+
-
+
Load 1  
0 to +30 V  
0 to 4 A (PS280)  
0 to 2 A (PS283)  
Figure 14: Parallel Tracking Application  
7. Adjust the output voltage to the desired level using the master  
VOLTAGE knob.  
8. Turn the POWER off to the PS280 or PS283 again.  
9. Connect the positive polarity of the device being powered to the  
positive master terminal.  
10. Connect the negative polarity of the device being powered to the  
negative master terminal.  
CAUTION. To prevent damage to the PS280 or PS283, do not attempt  
to obtain output simultaneously from both variable power supplies  
while in parallel tracking mode.  
NOTE. The 5 V FIXED supply can be independently grounded or  
allowed to float.  
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24  
Appendix A: Specifications  
Table 1: Physical Characteristics  
Dimension  
Width  
Measurement  
255 mm (10.0 in)  
145 mm (5.7 in)  
Height  
Depth  
335 mm (13.2 in)  
Weight  
11.5 kg (25.4 lb) PS280  
9.0 kg (19.9 lb) PS283  
Table 2: Environmental Characteristics  
Characteristic  
Storage  
Temperature  
–10_C to +70_C  
0_C to 40_C  
Relative Humidity  
70%  
80%  
Operating  
Table 3: Operational Characteristics  
Characteristic  
Outputs  
Measurement  
Two 0 to 30 VDC, one 5 VDC  
Voltage (5 V)  
5.0 ±0.25 VDC at 3.0 A maximum foldback current  
limited  
Voltage (0–30 V)  
0–30 constant VDC at 2.0 A constant, maximum (PS280)  
or 1.0 A constant. maximum (PS283)  
Line Regulation (5 V)  
Line Regulation (CV)  
5 mV  
0.01% +3 mV PS280  
0.01% + 5 mV PS283  
PS280 & PS283 User Manual  
25  
 
Appendix A: Specifications  
Table 3: Operational Characteristics (Cont.)  
Characteristic  
Measurement  
Line Regulation (CC)  
0.2% +3 mA  
Load Regulation (5 V)  
Load Regulation (CV)  
0.2%  
0.01% +3 mV (rating current 3 A)  
0.01% +5 mV (rating current >3 A)  
300 mV (0–60 V single series tracking supply)  
Load Regulation (CC)  
Ripple/Noise (5 V)  
Ripple/Noise (CV)  
0.2% +3 mA  
2 mV rms  
1 mV rms, 5 Hz–1 MHz  
3 mA rms  
Ripple (CC)  
Temperature Coefficient (CV)  
Recovery Time (CV)  
300 ppm/_C  
100 ms (time to recover after a 50% load change with  
0.5 A minimum)  
Tracking Error (Slave)  
Indicator  
0.5% +10 mV of the master supply  
Two 3 1/2 digit 0.5 in LED panel display meter  
Meter Indicators  
0–30 VDC ±(0.5% of reading + 2 digits)  
0–2 A ±(0.5% of reading + 2 digits)  
Insulation  
20 MW at DC 500 V  
(Chassis-to-Terminal)  
Insulation  
30 MW at DC 500 V  
(Chassis-to-AC Cord))  
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26  
Appendix A: Specifications  
Table 4: Electrical Characteristics  
Characteristic  
Measurement  
Line voltage  
90 to 110  
108 to 132  
198 to 242  
216 to 250, all VAC at 50–60 Hz  
Power consumption  
386 VA, 300 W maximum (PS280)  
265 VA, 200 W maximum (PS283)  
Table 5: Certifications and Compliances  
EC Declaration of  
Conformity – EMC  
Meets 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 55011  
Class B Radiated and Conducted Emissions  
EN 50081-1 Emissions:  
EN 60555-2 AC Power Line Harmonic Emissions  
EN 50082-1 Immunity:  
IEC 801-2  
IEC 801-3  
IEC 801-4  
IEC 801-5  
Electrostatic Discharge Immunity  
RF Electromagnetic Field Immunity  
Electrical Fast Transient/Burst Immunity  
Power Line Surge Immunity  
EC Declaration of  
Conformity – Low  
Voltage  
Compliance was demonstrated to the following specification as  
listed in the Official Journal of the European Communities:  
Low Voltage Directive 73/23/EEC, amended by 93/68/EEC.  
HD401 S1  
Safety Requirements for Electronic  
Measuring Aparatus.  
PS280 & PS283 User Manual  
27  
 
Appendix A: Specifications  
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28  
Appendix B: Maintenance  
This appendix provides information for the basic maintenance of the  
PS280 or PS283 Laboratory DC Power Supply.  
Cleaning  
To clean the Laboratory DC Power Supply, use a soft cloth  
dampened in a solution of mild detergent and water. Do not spray  
cleaner directly onto the instrument, since it may leak into the  
cabinet and cause damage.  
Do not use chemicals containing benzine, benzene, toluene, xylene,  
acetone, or similar solvents.  
Do not use abrasive cleaners on any portion of the power supply.  
Preparing for Shipment  
If the original packaging is unfit for use or not available, use the  
following packaging guidelines:  
1. Use a corrugated cardboard shipping carton having inside  
dimensions at least three inches greater than the instrument  
dimensions.  
2. Put the instrument into a plastic bag or wrap to protect it from  
dampness and loose packing material.  
3. Place the instrument into the box and firmly stabilize it with  
packing material.  
4. Seal the carton with shipping tape.  
PS280 & PS283 User Manual  
29  
 
Appendix B: Maintenance  
Troubleshooting  
Electronic maintenance on the power supply must be performed by a  
trained technician. However, an operator can perform some basic and  
routine maintenance. Perform the following steps to isolate the fault:  
1. The power switch is on. The instrument is plugged in. Neither the  
C.C. nor the C.V. indicator is lighted.  
Check the output terminals with a voltmeter.  
a. Set the voltage control of the voltmeter to midrange.  
b. Ensure that the range and polarity settings are correct.  
c. Place the voltmeter jacks in the PS280 or PS283 output  
terminals.  
d. Determine if the terminals are producing any output.  
Are the outputs working?  
Yes  
No  
Go to step 2.  
Go to step 3.  
2. Refer to a service technician.  
WARNING. To prevent electrical shock, unplug the power cord and  
disconnect the test cables from any power source before checking or  
replacing the fuse.  
3. Check the fuse with a multimeter.  
a. Set the multimeter to the low ohms range.  
b. Apply the multimeter probes across the fuse.  
c. Determine if a continuous circuit exists.  
Is the fuse okay?  
Yes  
No  
Go to step 5.  
Go to step 4.  
4. Replace the fuse.  
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30  
Appendix B: Maintenance  
5. Verify that the line settings on the rear panel match the line  
voltage. Do they?  
Yes  
No  
Go to step 7.  
Go to step 6.  
6. Reset the line settings. Refer to Preparing the Power Supply for  
Use on page 2.  
7. Check the power cord.  
WARNING. To prevent personal injury, be sure the power cord is  
disconnected at both ends before you check it.  
Is the power cord frayed or broken?  
Yes  
No  
Go to step 8.  
Go to step 2.  
8. Replace the power cord.  
9. The power switch is on. A variable output power supply is  
connected to a circuit. The C.C. or C.V. indicator is on. Neither  
variable output power supply is producing any electrical output.  
Disconnect the instrument from the circuit. Check the output  
terminals with a voltmeter. Are the outputs working?  
Yes  
No  
Go to step 10.  
Go to step 2.  
10. Check the circuit you have been testing for a short or low  
resistance.  
PS280 & PS283 User Manual  
31  
 
Appendix B: Maintenance  
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32  
Appendix C: Replaceable Parts  
Replaceable parts may be ordered directly from your authorized  
Tektronix dealer.  
Standard Accessories  
The following items are shipped with the Laboratory DC Power  
Supply:  
Table 6: Standard Accessories  
Accessory  
Tektronix Part Number  
Fuse, 5 x 20 mm, 4 A, 250 V, SB  
(PS280: 90 – 132 V operation)  
159-0297-00  
Fuse, 5 x 20 mm, 2.5 A, 250 V, SB  
(PS283: 90 – 132 V operation)  
159-0226-00  
Test Leads  
196-3201-00  
070-8355-XX  
Refer to Table 8  
User Manual  
115 V Power Cord  
Optional Accessories  
The following items are available as optional accessories:  
Table 7: Optional Accessories  
Accessory  
Tektronix Part Number  
Fuse, 5 x 20 mm, 2 A, 250 V, SB  
(PS280: 198 – 250 V operation)  
159-0107-00  
Fuse, 5 x 20 mm, 1.25 A, 250 V, SB  
(PS283: 198 – 250 V operation)  
159-0247-00  
230 V Power Cords  
Refer to Table 8  
PS280 & PS283 User Manual  
33  
 
Appendix C: Replaceable Parts  
The following power cords are available:  
Table 8: Accessory Power Cords  
Tektronix Part  
Number  
Plug Configuration  
Normal Usage  
North America  
115 V  
161-0104-00  
Europe  
230 V  
161-0104-06  
United Kingdom  
230 V  
161-0104-07  
161-0104-05  
Australia  
230 V  
North America  
230 V  
161-0104-08  
161-0167-00  
Switzerland  
230 V  
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34  

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