User's Guide
Model 382260
80W 3-in-1 Switching DC Power Supply
Introduction
Congratulations on your purchase of the Extech 80W 3-in-1 Switching DC Power Supply.
The Model 382260 has three output ranges that perform like 3 power supplies in one. It
can be used for many applications including bench testing, field service, hobby and
telecommunication equipment use. This power supply is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service.
Safety
This manual contains important safety and operation instructions for correct use of the
power supply. Read through the manual and pay special attention to the markings and
labels of this unit and equipment to be connected.
Pay special attention to these two types of notices used in this manual
WARNING : Failure to observe this warning may cause injury to persons and
CAUTION : Failure to observe this warning may result in damage to equipment and
WARNING :
damage to power supply or connected equipment.
Improper functioning of the power supply.
1. Do not use this power supply near water.
2. Do not operate or touch this power supply with wet hands.
3. Do not open the casing of the power supply when it is connected to ac
mains.
4. Refer all servicing to qualified service personnel only.
5. Before replacing the AC fuse find out and clear up the cause first.
6. Replace the AC fuse with the same type and rating as the original fuse.
CAUTION :
1. Use a grounded 3 pin AC source .
2. This unit is for indoor use only .
3. Do not operate or place this unit in a humid, dusty, in direct sunlight
locat i o n or n ea r any heat source.
4. Before plugging into local AC mains, check with the rating label at the back
of the unit.
5. Do not block any ventilation openings of the unit.
6. This unit must be used within the specified rating, regular excessi ve
continuous loading may cause damage to the power supply.
7. The gauge size of input power cable must be at least 0.75mmsq and the
total length of power cable must not exceed 3m.
8. Input Fuse Recommended: T3AL250V (3A Time-Lag)
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Power Supply Description
1. Power On/Off switch
2. Output terminals
3. UVL adjustment screw
4. Current adjustment
5. Voltage adjustment
6. Upper Voltage Limit button
7. Preview button
8. Range selector
9. Output On/Off button
10. UVL indicator
11. Constant Voltage indicator
12. Constant Current indicator
13. Overvoltage or Temperature alarm
14. Slave indicator
15. LED Voltage Display
16. LED Current Display
17. Master/Slave switch
18. Master/Slave control terminals
19. Remote Sensing terminals
20. Rear Output terminals
21. AC power socket
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Stand Alone Operation
1. Set the Master/Slave switch located on the back of the unit to the Master position.
2. Without any load attached, use the POWER button to switch on the power supply and
the LED indicator will light. There should not be any reading on the voltmeter and
ammeter.
3. Press the Output On/Off button and its green LED will light up, the voltmeter will
display the previously set output voltage. Use the voltage control knob to adjust the
voltage to the desired level.
4. Use the Output On/Off button to turn off the output. Note: The output will automatically
shut off when one of the other voltage/current range selection buttons is pushed. This
is to prevent damage to a connected load if the voltage/current values are set too high.
5. Press and Hold the Preview button to display the previously set voltage and current
limiting values. With this button held down, you can set the current limiting value
without connecting to a load or shorting the output terminals. Note: The Output button
must be in the Off position.
Setting the Upper Voltage Limit (UVL) Value
The Upper Voltage Limit Value is an added protection for voltage sensitive loads. When
the output voltage exceeds the set UVL, the output terminal will automatically shut off and
the ALM LED will light. Note: Only one UVL value can be set for all three ranges.
1. Press the UVL/Voltage and insert a small screwdriver into the UVL adjustment
screw.
2. Turn clockwise to increase the voltage limit and counter-clockwise to decrease the
UVL value.
Remote Sensing Operation
When the output current is high or the load connection is long, there is a voltage drop
across the connecting cable. This results in a difference between the voltage at the output
terminal and load point. By making an extra connection using the Remote Sensing
Terminal to the load point, the reading at the output terminal and load point is the same.
Caution: Observe correct polarity and never short the Remote Sensing terminal
1. Connect the load to the power supply.
2. Connect the load to the Remote Sensing Terminal.
Note: Always disconnect the Remote Sensing terminal connections first.
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Master/Slave Operation
Two or more Model 382260 Power Supplies can be connected in parallel to increase
output current to the sum of the connected supplies. In this mode of operation, the Master
power supply will control all of the voltage and current settings of the Slave units.
1. Set all of the power supplies to the same upper voltage limit (UVL) and
voltage/current range.
2. Set the voltage and current limit of all of the slaves to maximum values.
3. Switch off all of the power supplies.
4. Set the Master/Slave switch to the Slave position on all of the Slave units.
5. Connect the power supplies together using the Master/Slave control circuit on the
back of the power supplies. Note: For proper performance all connecting cables
and output cables should be the same gauge and length.
6. Using either the output terminals on the front or back of the units, connect the
output cables in parallel to the load.
7. Switch on the Master unit first and set to the desired voltage.
8. Switch on the slave units and the Slave Indicator LED will light to confirm correct
connection.
9. All output voltages and currents are now controlled by the Master unit.
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Specifications
Display Dual 4-digit LED
Display Accuracy ±(1% + 2 counts)
Voltage Output, DC 0 to 16.4V 0 to 27.6V 0 to 36.8
Current Output, DC 0 to 5.1A 0 to 3.1A 0 to 2.3A
Ripple and Noise <30mVp-p
Line Regulation < 4mV/<10mA
Load Regulation < 20mV/<10mA
Efficiency >75%
Power Factor >0.9
Operating %RH 10 to 80% RH
Altitude 2000m
Installation Category CAT 2
Pollution degree 2
Power 90 to 264VAC (47 to 63Hz)
Supply voltage fluctuation ± 10% of stated operating voltage
Dimensions 13 x 5 x 2" (330 x 127 x 53.5mm) (WxHxD)
Weight 4.2lbs. (1.9 kg)
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
382260 V1.0 6/07 6
Trouble Shooting
PROBLEM INDICATIONS POSSIBLE CAUSES
Power supply not
working
No DC output power Voltage meter zero
Voltage meter reading
grossly inaccurate
Ampere meter reading
grossly inaccurate
The activated
(auto- cross over )
c ur r e n t limiting value
is different from the
preset cc value
Panel display, LED
Indicators not on
indication.
ALM (13) Alarm led on
CC (12) led on
Actual output voltage is
grossly different from
the meter read out
In CV mode , the actual
current measured is
grossly different from
the Amp meter reading
All indicators and
display are normal ,
on l y C C mode has the
problem
A. AC power input not
connected
B. AC input fuse
blown
A. Output on off button
not on .
B. UVL (10 )
protection triggered
C. OTP protection
triggered
D. Output short circuit
A. Volt meter shows
not the output
voltage.
B. Possible
misalignment in
voltmeter
calibration
Possible misalignment
in calibration .
For stand alone unit,
Master & Slave
Switch (17) in wrong
position (Slave). Wrong
setting or connection in
Master & Slave or
s e t u p procedure.
SUGGESTED
SOLUTIONS
A. Check AC power
connection,
B. Contact factory
A.
Check output LED
(9) is on or not,
push (9) to on
B. Check UVL set
voltage by pushing
(6), re-set UVL to
applicable limit.
C. Check vent holes at
top and bottom is
clear, ambient
temperature too
high
D. Check and undo
short circuit of
output connection.
A. Check the LED
indicator of UVL on
the top right hand
side of the Volt
meter, if it lights up
then the volt
met er only shows
the set UVL value.
Push (6) to go
back to output
voltage.
B. Contact factory
Contact factory
Check the Master &
Slave switch (17)
correct position. Use
stand alone mode to
check power supply
separately without any
connection to slave
units. Follow the
procedure car efully and
make s u r e there is only
one Master unit.
.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
382260 V1.0 6/07 7
All rights reserved including the right of reproduction in whole or in part in any form.
Technical Support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Copyright © 2007 Extech Instruments Corporation
Support line (781) 890-7440
382260 V1.0 6/07 8
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