Extech 382290 Operating Manual

User's Guide

Model 382290
900W Switching Mode DC Power Supply

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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