Tektronix Video Gaming Accessories CPS250 User Manual

User Manual  
CPS250  
Triple Output Power Supply  
070-6740-03  
 
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1
2
4
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Independent Mode Applications . . . . . . . . . . . . . . . . . . . . . . . .  
Tracking Mode Applications . . . . . . . . . . . . . . . . . . . . . . . . . . .  
7
7
13  
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17  
Appendix B: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Preparing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
19  
19  
19  
20  
Appendix C: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .  
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
23  
23  
23  
CPS250 User Manual  
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Table of Contents  
List of Figures  
Figure 1: Line Voltage Selectors, Power Input, and  
Fuse Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 2: Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 3: Independent Floating Application . . . . . . . . . . . . . . .  
Figure 4: Independent Ground-Referenced Applications (A) . .  
Figure 5: Independent Ground-Referenced Applications (B) . .  
Figure 6: Connecting the Two 0–20 V Supplies in Series  
to Produce 0 to +40 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 7: Connections to Provide Fixed +5 V and 0 to –40 V .  
Figure 8: Independent Ground-Referenced Applications  
(negative output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 9: Independent Ground-Referenced Applications  
(positive output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 10: Series-Tracking Applications . . . . . . . . . . . . . . . . . .  
Figure 11: Parallel-Tracking Applications . . . . . . . . . . . . . . . . .  
2
4
8
10  
10  
11  
12  
12  
13  
14  
15  
CPS250 User Manual  
ii  
 
General Safety Summary  
Review the following safety precautions to avoid injury and prevent  
damage to this product or any products connected to it.  
Only qualified personnel should perform service procedures.  
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.  
CPS250 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 Power Source  
Do not operate this product from a power source that applies more  
than the voltage specified.  
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.  
CPS250 User Manual  
iv  
 
General Safety Summary  
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.  
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  
CPS250 User Manual  
v
 
General Safety Summary  
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.  
CPS250 User Manual  
vi  
 
Getting Started  
The Tektronix CPS250 Triple Output Power Supply is a multifunc-  
tion bench or portable instrument. The fixed 5 volt output is  
available for use in transistor-transistor-logic (TTL) applications.  
Two 0 V to 20 volt, 500 mA, variable outputs meet the needs of most  
semiconductor test or experimental applications. Two or three of the  
output voltages may be externally wired to produce voltages  
different than the standard front panel voltages.  
The Tektronix CPS250 Triple Output Power Supply has a locking,  
multiposition handle that folds under the instrument to allow  
stacking with other instruments of the same series. The power supply  
is delivered with a set of test leads, a 115 V power cord, an installed  
fuse for 115 V operation, and this manual.  
CPS250 User Manual  
1
 
Getting Started  
Preparing the Power Supply for Use  
Check the following items prior to operating the CPS250 Triple  
Output Power Supply for the first time (see Figure 1 for locations of  
items 1 through 3):  
1
2
3
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 17.  
WARNING. To prevent electrical shock, unplug the power cord and  
disconnect the test leads from the circujit before checking or  
replacing the fuse.  
CPS250 User Manual  
2
 
Getting Started  
2. Check that the correct line fuse is installed. The line fuse  
provides protection if the equipment malfunctions or an overload  
occurs. Refer to Appendix C: Replaceable Parts on page 23 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 23 for power cord part numbers.  
NOTE. The center connector blade is connected to the green GND  
binding post on the front panel.  
4. Check the V and mA meters for mechanical zero. Adjustment  
may be corrected with the mechanical zero adjust disk located  
below the center of each meter. (Refer to Figure 2, item 4.)  
CAUTION. To prevent power supply damage, observe the mA meter  
and OVERLOAD indicators frequently during operation. The red  
areas of the meter scales indicate values in excess of equipment  
specifications.  
T o prevent damage to the circuit(s) powered by the CPS250 Triple  
Output Power Supply, check the polarity of the circuit(s) before  
connecting them to the power supply.  
CPS250 User Manual  
3
 
Getting Started  
Front Panel  
Figure 2 shows the front-panel controls, connectors, and indicators  
with brief descriptions of the items following the figure.  
3
4
5
4
6
7
2
1
8
9
15  
14  
13  
12 11  
10  
Figure 2: Front Panel  
1. POWER Button. Push top of switch to the ON position to turn  
power supply on. Push bottom of switch to the OFF position to  
turn equipment off.  
2. POWER ON Indicator. When lighted, LED indicates a power-on  
condition.  
3. Voltage Meter. This meter indicates the voltage level of A or B  
output, depending on the position of the A/B meter switch. The  
meter may be mechanically set for zero with the slotted  
mechanical zero adjust disk below the center of the meter.  
4. Mechanical Meter Adjustment. These slotted, plastic disks allow  
mechanical zero adjustment of the V and mA meters. Always  
rotate the adjustment in a clockwise direction for optimum  
results.  
5. A/B Meter Switch. This switch connects the V and mA meters to  
the A or B output circuit.  
CPS250 User Manual  
4
 
Getting Started  
6. Milliampere Current Meter. This meter indicates the current level  
of A or B output, depending on the position of the A/B meter  
switch. The meter may be mechanically set for zero with the  
slotted mechanical zero adjust disk below the center of the meter.  
7. A/B Output Switch. Switches A and B outputs from  
INDEPENDENT to TRACKING PARALLEL or TRACKING  
SERIES operation. When the switch is in the TRACKING  
position, A VOLTAGE and A CURRENT controls set the level of  
both A and B outputs. B VOLTAGE and B CURRENT controls  
are inoperative when the A/B OUTPUTS switch is set to the  
TRACKING position.  
8. B Voltage Control. Rotate to set voltage at B output terminals  
when A/B OUTPUTS switch is in the INDEPENDENT position.  
This control is inoperative when A/B OUTPUTS switch is in the  
TRACKING position.  
9. B CURRENT Control. Rotate to set current level available at B  
output when A/B OUTPUTS switch is in INDEPENDENT  
position. Control is inoperative when A/B OUTPUTS switch is in  
the TRACKING position.  
10. A CURRENT Control. Rotate to set current level available at A  
output when A/B OUTPUTS switch is in the INDEPENDENT  
position.  
11. A VOLTAGE Control. Rotate to set voltage at A output terminals  
when A/B OUTPUTS switch is in the INDEPENDENT position.  
12. A Output. Positive (red) and negative (black) output for  
independent 0 to 20 VDC, 0.5 A maximum. LED lights when  
OVERLOAD current limit is reached or exceeded.  
13. B Output. Positive (red) and negative (black) output for  
independent 0 to 20 VDC, 0.5 A maximum. LED lights when  
OVERLOAD current limit is reached or exceeded.  
14. 5 V 2 A Output. Positive (red) and negative (black) output for  
fixed 5 volts DC, 2 A maximum. LED lights when OVERLOAD  
current limit is reached or exceeded.  
15. Chassis Ground Connector. The green binding post is connected  
through the power cord to the power receptacle ground.  
CPS250 User Manual  
5
 
Getting Started  
CPS250 User Manual  
6
 
Reference  
This section of the manual includes examples of how to use the  
CPS250 Triple Output Power Supply. The number of possible  
applications is extensive, so only a few examples are given.  
CAUTION. Heat buildup may occur on the rear-panel heat sink during  
operation. To prevent equipment damage, ensure that the power  
supply has adequate air space for heat dissipation. Do not place  
hands or other objects on the heat sink during or after extended  
operation.  
Independent Mode Applications  
When in INDEPENDENT mode, any one output of each supply may  
be connected to any one terminal of another supply or to ground.  
Variable supplies are independently controlled by front panel voltage  
and current controls. Ground reference is recommended for safety.  
There are two types of independent mode operation:  
H Series Operation. A and B supplies (outputs) can be set to give  
0 V to 40 V output with the A/B OUTPUTS switch.  
H Parallel Operation. A and B supplies (outputs) may be set to  
parallel operation with the A/B OUTPUTS switch. A and B  
supplies may be operated in parallel to increase current. Refer to  
Parallel Tracking on page 14.  
Independent Floating  
Figure 3 on page 8 shows each of the three power supply outputs  
connected to separate loads. In this example the A/B OUTPUTS  
switch is set to INDEPENDENT. The green coded A VOLTAGE and  
A CURRENT controls set the level of output A. The brown coded  
controls set the level for output B. The three outputs are electrically  
independent. The V and mA meters read A or B output values  
(selected with the A/B meter switch).  
CPS250 User Manual  
7
 
Reference  
To configure the power supply for independent floating, do the  
following:  
1. With the CPS250 Triple Output Power Supply on and the outputs  
disconnected from loads, set the A and B VOLTAGE controls to  
the values needed (read on the V meter). Set the A and B  
CURRENT controls to midrange.  
2. Turn POWER to OFF, and connect the load(s).  
3. Turn POWER to ON, and readjust voltages if necessary.  
Load 1  
5 V  
Zero to 2 A  
Load 2  
Zero to 20 V  
Zero to 0.5 A  
Load 3  
Zero to 20 V  
Zero to 0.5 A  
Figure 3: Independent Floating Application  
Independent Ground-Referenced  
CAUTION. To prevent damage to the equipment when using any  
ground-referenced output configuration from the CPS250, the circuit  
or equipment being powered must be isolated from the CPS250s line  
voltage power source.  
Any one of each pair of output terminals, positive (+) or negative (–),  
may be connected to ground in any combination. Table 1 shows  
many of the possible voltage combinations using the chassis ground  
as a reference.  
CPS250 User Manual  
8
 
Reference  
CAUTION. To prevent electric shock, do not elevate any power supply  
output terminals with any external voltage source or power supply.  
Table 1: Independent Ground-Referenced Voltage Combinations  
5-Volt Supply  
+5 V, fixed  
+5 V, fixed  
+5 V, fixed  
+5 V, fixed  
–5 V, fixed  
–5 V, fixed  
–5 V, fixed  
–5 V, fixed  
A-Supply  
0 to +20 V  
0 to +20 V  
0 to –20 V  
0 to –20 V  
0 to +20 V  
0 to +20 V  
0 to –20 V  
0 to –20 V  
B-Supply  
0 to +20 V  
0 to –20 V  
0 to +20 V  
0 to –20 V  
0 to +20 V  
0 to –20 V  
0 to +20 V  
0 to –20 V  
Figure 4 on page 10 shows an example of a circuit with the +5 volt  
terminal referenced to ground and both the A and B supplies  
referenced to –5 V. In this configuration, each of the positive-going  
20 V supplies can be varied from –5 V to +15 V (+20 V overall). The  
GND post becomes the negative terminal for the A and B outputs.  
The V meter will indicate 0 V when the output is –5 V, 5 V when the  
output is zero, and 20 V when the output is 15 V. Negative 5 V is  
taken between GND and the black (–) post of the 5 V, 2 A output. To  
set up this configuration, proceed as follows:  
1. Turn the CPS250 POWER to OFF. Connect the outputs as  
shown in Figure 4 on page 10.  
2. Set the A and B VOLTAGE controls to MIN and the A and B  
CURRENT controls to midrange.  
3. Turn POWER to ON. The V meter should read 0 V in both the A  
and B position. An external meter connected across the load or  
load terminals should read –5 V.  
4. Turn POWER to OFF, and connect the load(s).  
5. Turn POWER to ON, and readjust voltages if necessary.  
CPS250 User Manual  
9
 
Reference  
Load 1  
–5 V  
2 A  
Load 2  
–5 to +15 V  
Zero to 0.5 A  
Load 3  
–5 to +15 V  
Zero to 0.5 A  
Figure 4: Independent Ground-Referenced Applications (A)  
Figure 5 shows the power supply connected to produce separate  
outputs of +5 V, 0 V to +20 V from the B supply, and 0 V to –20 V  
from the A supply. In this configuration the red terminal of output A  
is the relative negative terminal because it is connected directly to  
GND. To seu up this configuration, proceed as follows:  
Load 1  
+5 V  
Zero to 2 A  
Load 2  
Zero to +20 V  
Zero to 0.5 A  
Load 3  
Zero to –20 V  
Zero to 0.5 A  
Figure 5: Independent Ground-Referenced Applications (B)  
1. Turn the CPS250 POWER to OFF. Connect the outputs as  
shown in Figure 5.  
CPS250 User Manual  
10  
 
Reference  
2. Set the A and B VOLTAGE controls to MIN and the A and B  
CURRENT controls to midrange.  
3. Turn POWER to ON, and set the desired A and B voltages.  
4. Turn POWER to OFF, and connect the load(s).  
5. Turn POWER to ON, and readjust voltages if necessary.  
Figure 6 shows the power supply connected in series to produce a  
variable output of 0 + 40 V, ground referenced, and –5 V, ground  
referenced. The VOLTAGE and CURRENT controls are in series.  
The V meter reads only one supply at a time and the mA meter reads  
total current in either position. To read the total voltage the readings  
from the A position and B position must be added. To set up this  
configuration, proceed as follows:  
Load 1  
–5 V  
Load 2  
Zero to +40 V  
Figure 6: Connecting the Two 0–20 V Supplies in Series to Product 0 to +40 V  
1. Turn POWER to OFF, and connect the outputs as shown in  
Figure 6.  
2. Set the A and B VOLTAGE controls to MIN and the A and B  
CURRENT controls to midrange.  
3. Turn POWER to ON, and observe the V meter in the A and B  
positions to set the desired voltage. Remember, the total output is  
the sum of the two readings.  
4. Turn tPOWER to OFF, and connect the loads.  
CPS250 User Manual  
11  
 
Reference  
5. Turn POWER to ON, and readjust voltages if necessary.  
Zero to –40 V and fixed +5 V outputs are shown in Figure 7. Follow  
the procedures outlined above to operate this configuration.  
Load 1  
+5 V  
Load 2  
Zero to –40 V  
Figure 7: Connections to Provide Fixed +5 V and 0 to –40 V  
Figure 8 shows the configuration for three, ground referenced,  
negative supplies.  
Load 1  
–5 V  
Load 2  
Zero to –20 V  
Load 3  
Zero to –20 V  
Figure 8: Independent Ground-Referenced Applications (negative output)  
CPS250 User Manual  
12  
 
Reference  
Figure 9 shows the connections for three ground referenced, positive  
supplies.  
Load 1  
+5 V  
Load 2  
Zero to +20 V  
Load 3  
Zero to +20 V  
Figure 9: Independent Ground-Referenced Applications (positive output)  
Tracking Mode Applications  
Series Tracking  
When the A/B OUTPUTS selector is set to SERIES TRACKING, the  
–output of the A variable supply is connected internally to the  
+output of the B variable supply. When set to the SERIES TRACK-  
ING mode, the output may be floating or ground referenced.  
However, only one terminal of the two variable supplies may be  
grounded. These options are shown in Figure 10 on page 14. The  
output voltage and current are controlled by the A VOLTAGE and  
A CURRENT controls. For convenience, set the B VOLTAGE and  
B CURRENT controls fully clockwise to avoid the B supply shutting  
down.  
The 5 V fixed supply may be independently grounded or allowed to  
float.  
CPS250 User Manual  
13  
 
Reference  
Internal connection  
Load 1  
Zero to +40 V  
Load 1  
Zero to –40 V  
Internal  
connection  
Figure 10: Series-Tracking Applications  
Parallel Tracking  
When the A/B OUTPUTS selector is set to PARALLEL TRACK-  
ING, the + outputs of the A and B variable supplies are connected  
and the – outputs of the A and B variable supplies are connected.  
The resulting combination is a single supply capable of providing  
0 V to 20 V and up to 1.2 A. Control is provided by the A VOLTAGE  
and A CURRENT controls. The B VOLTAGE and B CURRENT  
controls should be set fully clockwise. The parallel output may be  
floating or ground referenced, but only one terminal (+ or –) may be  
at ground reference. Those options are shown in Figure 11.  
The 5 V fixed supply may be independently grounded or allowed to  
float.  
CPS250 User Manual  
14  
 
Reference  
Internal  
connections  
Load 1  
Zero to +20 V  
1.0 A  
Internal  
connections  
Load 1  
Zero to –20 V  
1.0 A  
Figure 11: Parallel-Tracking Applications  
CPS250 User Manual  
15  
 
Reference  
CPS250 User Manual  
16  
 
Appendix A: Specifications  
The following tables list the physical, environmental, operational,  
and electrical characteristics of the CPS250 Triple Output Power  
Supply:  
Table 2: 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 A 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:  
HD401S1  
Safety requirements for electronic measuring apparatus  
Table 3: Physical Characteristics  
Width  
Height  
Depth  
Weight  
240 mm (9.46 in)  
100 mm (3.94 in)  
230 mm (9.0 in)  
5.1 kg (11.2 lb)  
CPS250 User Manual  
17  
 
Appendix A: Specifications  
Table 4: Environmental Characteristics  
Storage Temperature  
–10_ C to 60_ C, 80% RH  
Operating Temperature  
10_ C to 40_ C, 75% RH  
Table 5: Operational Characteristics  
Outputs  
0 to 20 VDC (two), 5 VDC  
Voltage (5 V)  
5.0 ±0.1 VDC at 2.0 A maximum  
0–20 VDC at 0.5 A maximum  
0.1% +5 mV  
Voltage (0–20 V)  
Load Regulation (5 V)  
Load Regulation (0–20 V)  
Ripple/Noise  
0.01% +3 mV  
2 m V , 5 Hz–1 MHz  
RMS  
Tracking Error  
Indicator  
±0.2% ±20 mV  
Analog type front panel meter  
Meter Indicators  
0–25 VDC ±2.5% of full scale  
0–600 mA ±2.5% of full scale  
Table 6: Electrical Characteristics  
Line Voltage Range  
Power Consumption  
90 to 110, 108 to 132, 198 to 242, and 216 to 250 VAC at  
50–60 Hz  
175 VA, 160 W maximum  
CPS250 User Manual  
18  
 
Appendix B: Maintenance  
This appendix provides information for the basic maintenance of the  
CPS250 Triple Output Power Supply.  
Cleaning  
To clean the 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.  
CPS250 User Manual  
19  
 
Appendix B: Maintenance  
Troubleshooting  
Electronic maintenance on the CPS250 Triple Output Power Supply  
must be performed by a trained technician. However, an operator can  
perform some basic and routine maintenance. The power supply will  
give some indications of problems to aid the operator.  
Power Switch is On but Power-On LED not Lighted  
NOTE. The power indicator light is in the secondary of the 5 volt  
power supply circuit and may be inoperative even when voltages are  
present at the outputs of the supplies.  
1. Check all outputs with a voltmeter. If the variable supplies are  
working, but the 5 V supply is not, the problem is in the 5 V  
supply. Contact your nearest Tektronix service center for  
servicing.  
2. If all supplies are working and the power indicator is off, contact  
your nearest Tektronix service center for servicing.  
WARNING. To prevent electrical shock, unplug the power cord and  
disconnect the test leads from any circuit before checking or  
replacing the fuse.  
3. If none of the supplies are working, check the line fuse. If the  
fuse is open, replace it.  
4. If the line fuse is good, check the power outlet for proper voltage.  
If the outlet voltage is incorrect, call service personnel.  
WARNING. To prevent electical shock, be sure the power cord is  
disconnected at both ends before checking for continuity.  
5. If outlet voltage is correct, check power cord continuity. If the  
power cord fails the continuity check, replace the power cord.  
CPS250 User Manual  
20  
 
Appendix B: Maintenance  
POWER Light ON, but No Output from A or B Supplies with Power  
Supply connected to Circuit  
1. Disconnect the CPS250 outputs from the circuit being tested.  
Check A and B VOLTAGE and CURRENT controls.  
2. If the outputs are good, check the circuit under test for a short or  
low resistance.  
POWER Light ON, but No Output from Any Supplies with Power Supply  
Not Connected to Circuit  
Contact your nearest Tektronix service center for servicing.  
CPS250 User Manual  
21  
 
Appendix B: Maintenance  
CPS250 User Manual  
22  
 
Appendix C: Replaceable Parts  
Replaceable parts may be ordered directly from your authorized  
Tektronix dealer.  
Standard Accessories  
The following items are shipped with the CPS250 Triple Output  
Power Supply:  
Table 7: Standard Accessories  
Accessory  
Tektronix Part Number  
Fuse, 3AG, 2A, 250V, SB  
(90 – 132 V Operation)  
159–0023-00  
CPS250 User Manual  
115V Power Cord  
Lead Set  
070-6740-XX  
Refer to Table 9  
196-3384-XX  
Optional Accessories  
The following items are available as optional accessories:  
Table 8: Optional Accessories  
Accessory  
Tektronix Part Number  
Fuse, 3AG, 1A, 250V, SB  
(198 – 250 V operation)  
159-0019-00  
230V Power Cords  
Refer to Table 9  
CPS250 User Manual  
23  
 
Appendix C: Replaceable Parts  
The following power cords are available.  
Table 9: 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  
CPS250 User Manual  
24  
 

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