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User's Guide
Model 382290
900W Switching Mode DC Power Supply
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Introduction
Congratulations on your purchase of the Extech 900W Switching Mode DC Power Supply.
The Model 382290 can be used for many applications including bench testing, field
service, hobby and telecommunication equipment use. Remote control functionality allows
you to turn the power on/off and adjust the output voltage and current without turning the
dials. This power supply is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service.
Power Supply Description
1. Voltage & Current LED display
2. Voltage adjustment
3. Current adjustment
4. Power On/Off switch
5. Output terminals
6. Remote Sensing Terminal
7. Voltage Remote Control On/Off switch
8. Current Remote Control On/Off switch
9. Remote Control Terminal
10. Cooling fan
11. AC input
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Operation
Standard Operation without Remote Control or Remote Sensing
1. If you do not use the remote control feature, insure that both voltage and current
remote control On/Off switches are in the OFF position.
2. Connect the unit under test to the power supply.
3. Use the POWER button to turn the unit ON or OFF. When the unit is powered up, the
LED indicator will light green.
4. Use the Current and Voltage adjustment knobs for setting variable Current and Voltage
output signals respectively.
5. The LED display will indicate actual current and voltage outputs.
Operation with Remote Sensing
CAUTION: Observe correct polarity and never short the Remote Sensing Terminal
1. Connect the unit under test to the power supply.
2. Connect the unit under test to the Remote Sensing Terminal using 22AWG wire or
greater.
3. Use the POWER button to turn the unit ON or OFF. When the unit is powered up,
the LED indicator will light green.
4. Use the Current and Voltage adjustment knobs for setting variable Current and
Voltage output signals respectively.
5. The LED display will indicate actual current and voltage outputs.
Note: Always disconnect the Remote Sensing Terminal connections first.
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Remote Control Operation
Note: You can use the voltage and current remote control at the same time or separately.
Voltage and Current can be controlled by either a 0 to 5V external voltage source or a 5kΩ
variable resistor.
WARNING: The voltage and current remote control must NOT share a common ground.
Connector Plug Assembly for Voltage Remote Control
Set up the provided remote connector plug:
1. Unscrew (counter-clockwise) the black housing to separate
and expose the connection terminals
2. Solder 3 wires (22AWG) to terminals 1, 2 and 3
3. Reassemble the housing
4. Insure that the unit under test is disconnected and the power
supply is off
5. Plug the remote connector plug into the remote control
terminal on the back of the power supply
6. Secure the plug by locking the connector ring
Voltage Remote Control using a Voltage Source
A variable voltage source of 0 to 5V is fed into the remote terminal to
adjust the output level
WARNING: If the input is higher than 5V, the Over Voltage Protection will be triggered
1. Ensure that the load is disconnected and the power supply is off
2. Connect the wire from terminal 2 to the positive (+) side of the external voltage
source
3. Connect the wire from terminal 3 to the negative (-) side of the external voltage
source. Note: the wire from terminal 1 is not used in this method.
4. Turn the Voltage Remote Control On/Off switch to the On position
5. Switch the power supply on
6. Vary the external input voltage from 0 to 5V to check and verify the full output
voltage range of the power supply
7. Switch off the power supply
Voltage Remote Control using a 5kΩ variable resistor
1. Ensure that the load is disconnected and the power supply is off
2. Connect the wires from terminals 1, 2 and 3 as shown in the drawing
3. Turn the Voltage Remote Control On/Off switch to the On position
4. Switch the power supply on
5. Adjust the 5kΩ variable resistor to check and verify the full output voltage range of
the power supply
6. Switch off the power supply
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Connector Plug Assembly for Current Remote Control
Set up the provided remote connector plug:
1. Remove the screw from the black housing on the connector plug
2. Rotate the black housing to separate and expose the connection terminals
3. Solder 3 wires (22AWG) to terminals 4, 5 and 6
4. Reassemble the housing and secure with the screw
5. Ensure that the unit under test is disconnected and the power supply is off
6. Plug the remote connector plug into the remote control terminal on the back of the
power supply
7. Secure the plug by locking the connector ring
Current Remote Control using a Voltage Source
A variable voltage source of 0 to 2.5V is fed into the remote terminal to adjust the output
level
WARNING: If the input is higher than 2.5V, it may damage the power supply
1. Make sure that the load is disconnected and the power supply is off
2. Connect the wire from terminal 5 to the positive (+) side of the external voltage
source
3. Connect the wire from terminal 6 to the negative (-) side of the external voltage
source. Note: the wire from terminal 4 is not used in this method.
4. Turn the Voltage Remote Control On/Off switch to the On position
5. Switch the power supply on
6. Vary the external input voltage from 0 to 2.5V to check and verify the full output
current range of the power supply
7. Switch off the power supply
Voltage Remote Control using a 5kΩ variable resistor
1. Make sure that the load is disconnected and the power supply is off
2. Connect the wires from terminals 4, 5 and 6 as shown in the drawing
3. Turn the Voltage Remote Control On/Off switch to the On position
4. Switch the power supply on
5. Adjust the 5kΩ variable resistor to check and verify the full output current range of
the power supply
6. Switch off the power supply
Output On/Off Remote Control
Terminals 7 and 8 are used to remotely control the Output On/Off
1. An Open between terminals 7 and 8 enables the output (default)
2. Short terminals 7 and 8 to disable the output
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Specifications
Display Dual LED
Display Accuracy ±(1% +1d)
Voltage Output, DC 1 to 30.0 Volts
Current Output, DC 1 to 30.0 Amps
Ripple and Noise ±50mVp-p
Line Regulation < 0.05% + 3mV/< 0.1% + 5mA
Load Regulation < 0.1% + 5mV/< 0.2% + 5mA
Efficiency >82%
Dynamic Power Factor Correction >0.97 at optimal load
Power 110/220VAC (50/60Hz)
Dimensions 8.6 x 4.3 x 14.1" (220 x 110 x 360mm) (WxHxD)
Weight 12.8lbs. (5.8 kg)
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Support line (781) 890-7440
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 Guide, Software updates, and other
Up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to b e 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.
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.
Copyright © 2007 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
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