Extech Instruments 382260 User manual

User's Guide
Model 382260
80W 3-in-1 Switching DC Power Supply

382260-EN V1.5 7/12
2
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 damage to
power supply or connected equipment.
CAUTION : Failure to observe this warning may result in damage to equipment and
Improper functioning of the power supply.
WARNING :
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 location or near 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 excessive 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)

382260-EN V1.5 7/12
3
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. Review 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

382260-EN V1.5 7/12
4
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 Review 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.
Note: Front and rear output terminals are connected together internally.
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 cables. This results in a difference between the voltage at the output terminals and load
point. By connecting the Remote Sense Terminals to the load point, the reading at the output
display and load point will be the same.
Caution: Observe correct polarity and never short the Remote Sensing terminals together.
1. Connect power supply Output terminals to the Load.
(Use the front Output terminals to source higher current)
2. Connect the Remote Sensing Terminals to the Load.
(Push in on the Orange tabs to open the wire clamp inside the connector)
Connect RS+ to + Positive connection at the Load.
Connect RS- to -Negative connection at the Load.
Note: Always disconnect the Remote Sense terminal connections first before the Load connections.

382260-EN V1.5 7/12
5
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.

382260-EN V1.5 7/12
6
Specifications
Display Dual 4-digit LED
Display Accuracy ±(1% + 15 counts)
Voltage Output, DC 0.0 to 16.40V, 0.10 to 27.60V, 0.10 to 36.80
Current Output, DC 0.100 to 5.100A, 0.100 to 3.100A, 0.1 to 2.00A
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) (DxHxW)
Weight 4.2lbs. (1.9 kg)

382260-EN V1.5 7/12
7
Trouble Shooting
PROBLEM INDICATIONS POSSIBLE CAUSES
SUGGESTED
SOLUTIONS
Power supply not
working
Panel display, LED
Indicators not on
A. AC power input not
connected
B. AC input fuse
blown
A. Check AC power
connection,
B. Contact factory
No DC output power Voltage meter zero
indication.
ALM (13) Alarm led on
CC (12) led on
A. Output on off button
not on .
B. UVL (10 )
protection triggered
C. OTP protection
triggered
D. Output short circuit
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.
Voltage meter reading
grossly inaccurate
Actual output voltage is
grossly different from
the meter read out
A. Volt meter shows
not the output
voltage.
B. Possible
misalignment in
voltmeter
calibration
A. Check the LED
indicator of UVL on
the top right hand
side of the Volt
meter, if it lights up
then the volt
meter only shows
the set UVL value.
Push (6) to go
back to output
voltage.
B . Contact factory
Ampere meter reading
grossly inaccurate
In CV mode , the actual
current measured is
grossly different from
the Amp meter reading
Possible misalignment
in calibration .
Contact factory
The activated
(auto- cross over )
curre n t limiting value
is different from the
preset cc value
All indicators and
display are normal ,
onl y CC mode has the
problem
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.
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 carefully and
make sure there is only
one Master unit.
Copyright ©2012 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
www.extech.com