Tektronix PWS2185 Use and care manual

xx
PWS2185, PWS2323, PWS2326, and PWS2721
Linear DC Power Supplies
Specifications and Performance Verification
ZZZ
Technical Reference
*P077048200*
077-0482-00

PWS2185, PWS2323, PWS2326, and PWS2721
Linear DC Power Supplies
Specifications and Performance Verification
ZZZ
Technical Reference
xx
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
before performing service.
www.tektronix.com
077-0482-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
or suppliers, and are protected by national copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supersedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14150 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
Worldwide, visit www.tektronix.com to find contacts in your area.

Table of Contents
General Safety Summary ......................................................................................... iii
Specifications ....................................................................................................... 1
Performance Verification .......................................................................................... 5
Test Record ..................................................................................................... 6
Performance Verification Procedures....................................................................... 12
PWS2000 Series Specifications and Performance Verification i

Table of Contents
List of Tables
Table 1: Specifications............................................................................................. 1
Table 2: Mains power characteristics ............................................................................ 3
Table 3: Mechanical characteristics .............................................................................. 3
Table 4: Environment performance............................................................................... 4
Table 5: Keypad special operations .............................................................................. 4
Table 6: DC voltage accuracy..................................................................................... 7
Table 7: DC voltage readback accuracy ......................................................................... 8
Table 8: DC voltage line regulation .............................................................................. 8
Table 9: DC voltage load regulation.............................................................................. 9
Table 10: DC current accuracy.................................................................................... 9
Table 11: DC current readback accuracy ....................................................................... 10
Table 12: Voltage noise at 20 MHz.............................................................................. 11
Table 13: Current noise at 20 MHz.............................................................................. 11
Table 14: Test equipment......................................................................................... 12
ii PWS2000 Series Specifications and Performance Verification

General Safety Summary
General SafetySummary
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.
To Avoid Fire or Personal
Injury
Use proper power cord. Use only the power cord specified for this product and
certified for the country of use.
Use proper voltage setting. Before applying power, ensure that the line selector
is in the proper position for the source being used.
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.
Observe all terminal ratings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Power disconnect. The power switch disconnects the product from the power
source. See instructions for the location. Do not block the power switch; it must
remain accessible to the user at all times.
Do not operate without covers. Do not operate this product with covers or panels
removed.
Do not operate with suspected failures. If you suspect that there is damage to this
product, have it inspected by qualified service personnel.
Avoid exposed circuitry. Do not touch exposed connections and components when
power is present.
Use proper fuse. Use only the fuse type and rating specified for this product.
Do not operate in wet/damp conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Provide proper ventilation. Refer to the manual's installation instructions for details
on installing the product so it has proper ventilation.
PWS2000 Series Specifications and Performance Verification iii

General Safety Summary
TermsinThisManual 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.
Symbols and Terms on the
Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the marking.
WARN ING indicates an injury hazard not immediately accessible as you
read the marking.
CAUTION indicates a hazard to property including the product.
The following symbol(s) may appear on the product:
iv PWS2000 Series Specifications and Performance Verification

Specifications
This section contains specifications for the PWS2000 series instruments. All
specifications are guaranteed unless noted as "typical." Typical specifications are
provided for your convenience but are not guaranteed. Specifications that are
marked with the symbol are checked in Performance Verification.
Table 1: Specifications
Parameter PWS2185 PWS2323 PWS2326 PWS2721
Constant voltage
operation, nominal
The unit may be set to a constant voltage over a range of currents
Voltage range
This is the range
over which the
output voltage is
adjustable
0to18V 0to32V 0to32V 0to72V
Voltage resolution,
nominal
10 mV
Voltage setting
accuracy
At 25 °C ±5 °C
±(0.05% of settling + 10 mV)
Current limit,
nominal
Defined by the constant current setting. The changeover is automatic.
Voltage
temperature
coefficient, typical
±(0.02% + 5 mV) per °C outside the 25 °C ±5 °C standard range
Constant current
operation, nominal
The unit may be set to a constant current over a range of voltages
Current range
This is the range
over which the
output current is
adjustable
0Ato5A 0Ato3A 0Ato6A 0Ato1.5A
Current resolution,
nominal
10 mA
Current setting
accuracy
At 25 °C ±5 °C
±(0.2% + 10 mA)
Defined by the constant voltage setting. The changeover is automatic.
Voltage limit,
nominal 0to 18 V 0to 32 V 0to 32 V 0to 72 V
Current
temperature
coefficient, typical
±(0.1% + 5 mA) per °C outside the 25 °C ±5 °C standard range
Meter, nominal Internal measurement capability. Voltage and current are measured internally.
PWS2000 Series Specifications and Performance Verification 1

Specifications
Table 1: Specifications (cont.)
Parameter PWS2185 PWS2323 PWS2326 PWS2721
Current readback
resolution, nominal
10 mA
Current
readback accuracy
At 25 °C ±5 °C
±(0.1% of reading + 15 mA)
Current readback
temperature
coefficient, typical
±(0.1% + 15 mA) per °C outside the 25 °C ±5 °C standard range
Voltage
readback accuracy
At 25 °C ±5 °C
±(0.05% of reading +
15 mV)
±(0.05% of reading +
15 mV) when VSET <
20 V
±(0.05% of reading +
120 mV) when VSET ≥
20 V
±(0.05% of reading +
15 mV) when VSET <
20 V
±(0.05% of reading +
120 mV) when VSET ≥
20 V
±(0.05% of reading +
15 mV) when VSET <
20 V
±(0.05% of reading +
120 mV) when VSET ≥
20 V
Voltage readback
resolution, nominal
10 mV 10 mV when VSET <
20 V
100 mV when VSET ≥
20 V
10 mV when VSET <
20 V
100 mV when VSET ≥
20 V
10 mV when VSET <
20 V
100 mV when VSET ≥
20 V
Voltage readback
temperature
coefficient, typical
±(0.02% of reading + 15 mV) per °C outside the 25 °C ±5 °C standard range
Maximum input
VArms,typical
350 VA 350 VA 700 VA 350 VA
Line regulation
– voltage
Change over the full rated input voltage: ±(0.1% + 5 mV)
Line regulation –
current, typical
Change over the full rated input voltage: ±(0.1% + 2 mA)
Load regulation
– voltage
Change from 0 to 100%
FS; ±(0.02% + 5 mV)
Change from 0 to 100%
FS; ±(0.02% + 5 mV)
Change from 0 to 100%
FS; ±(0.04% + 6 mV)
Change from 0 to 100%
FS; ±(0.02% + 4 mV)
Load regulation –
current, typical
Change from 10 to 90% FS; ±(0.1% + 2 mA)
Voltage ripple,
20 MHz bandwidth
<2mV
rms and 20 mVp-p
<1.5mV
rms and 12 mVp-p,typical
Voltage ripple,
7 MHz bandwidth
<1mV
rms and 3 mVp-p
Current ripple,
20 MHz bandwidth
<5mA
rms
Isolation voltage The product can operate properly with up to 100 VDC + pk AC between the Earth Ground terminal and any
other terminal with AC limited to 3 Vp-p maximum and 60 Hz maximum.
Setup memory,
nominal
20 setup locations
Software voltage
limit
The maximum settable voltage (MAX VOLT) menu entry, when set below the hardware maximum voltage limit,
disallows adjusting the instrument to voltages more than the MAX VOLT limit.
2 PWS2000 Series Specifications and Performance Verification

Specifications
Table 2: Mains power characteristics
Parameter PWS2185 PWS2323 PWS2326 PWS2721
Voltage Two ranges. Bottom-panel switch selectable.
110 V: 110 VAC to 120 VAC
220 V: 220 VAC to 240 VAC
Frequency 50/60 Hz
Fuse rating,
nominal
110 VAC setting: 5 A
TH 250 V
220 VAC setting: 2.5 A
TH 250 V
110 VAC setting: 5 A
TH 250 V
220 VAC setting: 2.5 A
TH 250 V
110 VAC setting: 6.3 A
TH 250 V
220 VAC setting: 3.15 A
TH 250 V
110 VAC setting: 5 A
TH 250 V
220 VAC setting: 2.5 A
TH 250 V
Table 3: Mechanical characteristics
Parameter PWS2185 PWS2323 PWS2326 PWS2721
Weight, nominal
Includes boots, and
handles
15.8 lbs
(7.1 kg)
15.8 lbs
(7.1 kg)
16.0 lbs
(7.3 kg)
15.7 lbs
(7.1 kg)
Dimensions,
nominal
With boots and handle:
Height: 105 mm (4.15 in)
Width: 242 mm (9.52 in)
Depth: 384 mm (15.12 in)
Without boots and handle:
Height: 91 mm (3.57 in)
Width: 217 mm (8.55 in)
Depth: 362 mm (14.24 in)
Cooling method,
nominal
Fan
Required cooling
clearance
Rear of instrument must be separated by at least 5 cm (2 in) from any airflow restriction.
Rear of instrument must be separated by at least 5 cm (2 in) from any airflow restrictions to assure adequate
cooling.
Bottom of instrument must have 1 cm (0.4 in) from any airflow restrictions. The protective boot maintains
the proper bottom clearance.
For rackmount configuration, follow the clearance requirements provided with the rackmount installation
instructions.
Construction
materials, nominal
Chassis – Aluminum
Front Panel Plastics – PC/ABS blend
PWS2000 Series Specifications and Performance Verification 3

Specifications
Table 4: Environment performance
Parameter All models
Temperature Operating: +0 °C to +40 °C
Nonoperating: -20 °C to 70 °C
Humidity Operating:
5% to 95% relative humidity (% RH) at up to 40 °C, noncondensing
Nonoperating:
5% to 95% relative humidity (RH) at up to +40 °C,
5% to 60% RH above +40 °C up to +70 C, noncondensing
Altitude Operating: 100% capability up to 2,000 meters.
Nonoperating: Up to 4,000 meters
Table 5: Keypad special operations
Operation Key press
Display the internal temperature of the instrument. Enter + Esc + .
Perform a factory reset. All setups are erased. Enter + Esc + 2
4 PWS2000 Series Specifications and Performance Verification

Performance Verification
This section contains performance verification procedures for the specifications
marked with the symbol. Additional test equipment is required to complete the
verification procedures. (See Table 14 on page 12.)
These procedures cover the PW2185, PWS2323, PWS2326, and
PWS2721 models. Ignore checks that do not apply to the specific model you
are testing.
Print the test record on the following pages, and use it to record the performance
test results for your power supply.
NOTE. Completion of the performance verification procedure does not update the
stored time and date of the latest successful adjustment. The date and time are
updated only when the factory adjustment procedures are successfully completed.
The performance verification procedures verify the performance of your
instrument. They do not adjust your instrument. If your instrument fails any of
the performance verification tests, you should contact Tektronix service.
WARNING. Observe all safety precautions listed in this manual before using
this product and any associated instrumentation. Although some instruments
and accessories are used with nonhazardous voltages, there are situations
where hazardous conditions may be present. This product is intended for use by
qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Before using the product, carefully
read and follow all installation, operation, and maintenance information. Refer
to this manual for complete product specifications. Before performing any
maintenance, disconnect the line cord and all test cables. Operators of this
instrument must be protected from electric shock at all times. The responsible
body must make sure that operators are prevented access and/or insulated from
every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to
protect themselves from the risk of electric shock. If the circuit can operate at or
above 1000 volts, no conductive part of the circuit may be exposed.
WARNING. Do not loosen any screw on this product. There are no user
serviceable components inside.
CAUTION. Use properly rated load wires. All load wires must be heavy enough not
to overheat when carrying the maximum short-circuit output current of the power
supply. If there is more than one load, then any pair of load wires must be capable
of safely carrying the full-rated short-circuit output current of the power supply.
PWS2000 Series Specifications and Performance Verification 5

Performance Verification
Test Record
Model Serial Procedure performed by Date
Test Passed Failed
Self Test
DC voltage accuracy
DC voltage readback accuracy
DC voltage load regulation
DC voltage line regulation
DC current accuracy
DC current readback accuracy
Voltage ripple at 7 MHz
Voltage ripple at 20 MHz
Current ripple at 20 MHz
6 PWS2000 Series Specifications and Performance Verification

Performance Verification
Table 6: DC voltage accuracy
Instrument DUT voltage Test current Min Measured Max
0% Test Voltage
PWS2185 0 V 2.5 A -0.0100 V __________ 0.0100 V
PWS2323 0 V 1.5 A -0.0100 V __________ 0.0100 V
PWS2326 0 V 3 A -0.0100 V __________ 0.0100 V
PWS2721 0 V 0.75 A -0.0100 V __________ 0.0100 V
25% Test Voltage
PWS2185 4.5 V 2.5 A 4.48775 V __________ 4.51225 V
PWS2323 8 V 1.5 A 7.98600 V __________ 8.01400 V
PWS2326 8 V 3 A 7.98600 V __________ 8.01400 V
PWS272118 V 0.75 A 17.98100 V __________ 18.01900 V
50% Test Voltage
PWS2185 9 V 2.5 A 8.9855 V __________ 9.0145 V
PWS2323 16 V 1.5 A 15.9820 V __________ 16.0180 V
PWS2326 16 V 3 A 15.9820 V __________ 16.0180 V
PWS2721 36 V 0.75 A 35.9720 V __________ 36.0280 V
75% Test Voltage
PWS2185 13.5 V 2.5 A 13.483250 V __________ 13.516750 V
PWS2323 24 V 1.5 A 23.978000 V __________ 24.022000 V
PWS2326 24 V 3 A 23.978000 V __________ 24.022000 V
PWS2721 54 V 0.75 A 53.963000 V __________ 54.037000 V
100% Test Voltage
PWS2185 18 V 2.5 A 17.9810 V __________ 18.0190 V
PWS2323 32 V 1.5 A 31.9740 V __________ 32.0260 V
PWS2326 32 V 3 A 31.9740 V __________ 32.0260 V
PWS2721 72 V 0.75 A 71.9540 V __________ 72.0460 V
PWS2000 Series Specifications and Performance Verification 7

Performance Verification
Table 7: DC voltage readback accuracy
Instrument DUT voltage Test current
Measured
voltage
Voltage
readout
Absolute
difference
Maximum
difference
0% Test Voltage
PWS2185 0V 2.5A ________ ________ ________ 0.01500 V
PWS2323 0V 1.5A ________ ________ ________ 0.01500 V
PWS2326 0V 3A ________ ________ ________ 0.01500 V
PWS2721 0 V 0.75 A ________ ________ ________ 0.01500 V
25% Test Voltage
PWS2185 4.5 V 2.5 A ________ ________ ________ 0.01725 V
PWS2323 8V 1.5A ________________________0.01900 V
PWS2326 8V 3A ________________________0.01900 V
PWS2721 18 V 0.75 A ________ ________ ________ 0.02400V
50% Test Voltage
PWS2185 9V 2.5A ________ ________ ________ 0.01950 V
PWS2323 16 V 1.5 A ________ ________ ________ 0.02300 V
PWS2326 16 V 3 A ________ ________ ________ 0.02300 V
PWS2721 36 V 0.75A ________ ________ ________ 0.13800 V
75% Test Voltage
PWS2185 13.5 V 2.5A ________ ________ ________ 0.02175 V
PWS2323 24 V1.5A ________ ________ ________ 0.13200 V
PWS2326 24V 3A________ ________ ________ 0.13200 V
PWS2721 54V 0.75 A ________ ________ ________ 0.14700 V
100% Test Voltage
PWS2185 18 V 2.5 A ________ ________ ________ 0.02400 V
PWS2323 32 V 1.5 A ________ ________ ________ 0.13600 V
PWS2326 32 V 3 A ________ ________ ________ 0.13600 V
PWS2721 72 V 0.75 A ________ ________ ________ 0.15600 V
Table 8: DC voltage line regulation
Instrument Min line Max line Nom line Nom – Min Max – Nom Largest Max value
PWS2185 __________ __________ __________ __________ __________ __________ 0.0230 V
PWS2323 __________ __________ __________ __________ __________ __________ 0.0370 V
PWS2326 __________ __________ __________ __________ __________ __________ 0.0370 V
PWS2721 __________ __________ __________ __________ __________ __________ 0.0770 V
8 PWS2000 Series Specifications and Performance Verification

Performance Verification
Table 9: DC voltage load regulation
Instrument Min load Ref load Max load Ref – Min Max – Ref
(Max–Ref)
/ 0.98 Largest
Max
value
PWS2185 ________ ________ ________ ________ ________ ________ ________ 0.00860 V
PWS2323 ________ ________ ________ ________ ________ ________ ________ 0.01140 V
PWS2326 ________ ________ ________ ________ ________ ________ ________ 0.01880 V
PWS2721 ________ ________ ________ ________ ________ ________ ________ 0.01840 V
Table 10: DC current accuracy
Instrument Test voltage DUT current Min Measured current Max
0% Test Current
PWS2185 9 V 0.0 A -0.01000 A __________ 0.01000 A
PWS2323 16 V 0.0 A -0.01000 A __________ 0.01000 A
PWS2326 16 V 0.0 A -0.01000 A __________ 0.01000 A
PWS2721 36 V 0.0 A -0.01000 A __________ 0.01000 A
25% Test Current
PWS2185 9 V 1.25 A 1.23750 A __________ 1.26250 A
PWS2323 16 V 0.75 A 0.73850 A __________ 0.76150 A
PWS2326 16 V 1.5 A 1.48700 A __________ 1.51300 A
PWS2721 36 V 0.375 A 0.36425 A __________ 0.38575 A
50% Test Current
PWS2185 9 V 2.5 A 2.48500 A __________ 2.51500 A
PWS2323 16 V 1.5 A 1.48700 A __________ 1.51300 A
PWS2326 16 V 3 A 2.98400 A __________ 3.01600 A
PWS2721 36 V 0.75 A 0.73850 A __________ 0.76150 A
75% Test Current
PWS2185 9 V 3.75 A 3.73250 A __________ 3.76750 A
PWS2323 16 V 2.25 A 2.23550 A __________ 2.26450 A
PWS2326 16 V 4.5 A 4.48100 A __________ 4.51900 A
PWS2721 36 V 1.125 A 1.11275 A __________ 1.13725 A
100% Test Current
PWS2185 9 V 5 A 4.98000 A __________ 5.02000 A
PWS2323 16 V 3 A 2.98400 A __________ 3.01600 A
PWS2326 16 V 6 A 5.97800 A __________ 1.51300 A
PWS2721 32 V 1.5 A 1.48700 A __________ 6.02200 A
PWS2000 Series Specifications and Performance Verification 9

Performance Verification
Table 11: DC current readback accuracy
DVM range Test current
Measured
current Current readout
Absolute
difference
Maximum
difference
0% Test Current
PWS2185 0A ________ ________ ________ 0.015000 A
PWS2323 0A ________ ________ ________ 0.015000 A
PWS2326 0A ________ ________ ________ 0.015000 A
PWS2721 0A ________ ________ ________ 0.015000 A
25% Test Current
PWS2185 1.25 A ________ ________ ________ 0.01625 A
PWS2323 0.75 A ________________________0.01575 A
PWS2326 1.5 A ________________________0.01650 A
PWS2721 0.375 A ________ ________ ________ 0.015375 A
50% Test Current
PWS2185 2.5 A ________ ________ ________ 0.01750 A
PWS2323 1.5 A ________ ________ ________ 0.01650 A
PWS2326 3A ________ ________ ________ 0.01800 A
PWS2721 0.75A ________ ________ ________ 0.01575 A
75% Test Current
PWS2185 3.75 A ________ ________ ________ 0.01875 A
PWS2323 2.25 A ________ ________ ________ 0.01725 A
PWS2326 4.5 A ________ ________ ________ 0.01950 A
PWS2721 1.125 A ________ ________ ________ 0.016125 A
100% Test Current
PWS2185 5A ________ ________ ________ 0.020000 A
PWS2323 3A ________ ________ ________ 0.018000 A
PWS2326 6A ________ ________ ________ 0.021000 A
PWS2721 1.5 A ________ ________ ________ 0.016500 A
10 PWS2000 Series Specifications and Performance Verification

Performance Verification
Table 12: Voltage noise at 20 MHz
Instrument
Voltage test
load R 1
Measured
rms
Maximum
rms
Measured
pk - pk
Maximum
pk - pk
PWS2185 4 Ω________ 2mV ________ 20 mV
PWS2323 12 Ω________ 2mV ________ 20 mV
PWS2326 6 Ω________ 2mV ________ 20 mV
PWS2721 60 Ω________ 2mV ________ 20 mV
1Load R must be rated at 100 W minimum
Table 13: Current noise at 20 MHz
Instrument
Current test
load R 1
Measured
rms
Maximum
rms
PWS2185 1 Ω________ 5mV
PWS2323 1 Ω________ 5mV
PWS2326 1 Ω________ 5mV
PWS2721 1 Ω________ 5mV
1Load R must be rated at 100 W minimum
PWS2000 Series Specifications and Performance Verification 11

Performance Verification
Performance Verification Procedures
Performance Verification
Conditions
The following conditions must be met before performing these procedures:
1. The Device Under Test (DUT) and all test equipment must have been
operating continuously for 20 minutes in an environment that meets the
operating range specifications for temperature and humidity.
2. The procedures are intended to be used in sequence. If it is necessary to
partially test the DUT using an individual test, a 20 minute warm-up period is
required for the individual test.
3. You must connect the DUT and the test equipment to the same AC power
circuit. Connect the DUT and test instruments into a common power strip if
you are unsure of the AC power circuit distribution. Connecting the DUT and
test instruments into separate AC power circuits can result in offset voltages
between the equipment, which can invalidate this performance verification
procedure.
4. The AC Power Source for the DUT must match the Voltage Selector switch
setting located on the bottom of the DUT.
DUT voltage selector switch AC source voltage
110 115 V
220 230 V
WARNING. Some procedures use hazardous voltages. To prevent electrical shock,
always power off instruments before touching exposed circuitry. Read and follow
the precautions in the General Safety Summary.
Equipment Required These procedures use external equipment to directly check warranted
characteristics. The following table lists the required equipment.
Table 14: Test equipment
Description Minimum requirements Examples
1. Connectors Connectors for hook up wire assemblies and test
resistors, item numbers 5, 6, 9, and 10.
(Qty. 6) #10 fork lugs similar to Tyco part number
52951
(Qty, 14) Stackable, gold plated, banana plugs/jacks
similar to Pomona model 4897-0. Used for lower
current connections, and connection to the load
resistors (items 9and 10) used for noise testing.
2. AC power source Variable AC output from 90 to 265 VAC with at least
600 VA capacity
Kikusui PCR2000M
12 PWS2000 Series Specifications and Performance Verification