EXTECH 382276 User Guide
User's Guide
Model 382275 and 382276
Single Output Laboratory Grade
Switching DC Power Supply
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Introduction
Congratulations on your purchase of the Extech 382275 (110V) or 382276 (220V) Single
Output Laboratory Grade DC Power Supply.
The dual action (coarse/fine tune) rotary encoder allows for quick and precise voltage and
current level adjustments. Setting, changing, and checking the current limit level can be
performed easily without sparking the output poles.
The remote control feature allows the user to remotely perform the following tasks:
Output power ON/OFF
Voltage and Current Level Adjustments
The three user-presets facilitate quick access to frequently used voltage and current
settings. This power supply is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service.
Safety
WARNING
• Do not use this power supply near water.
• Do not operate or touch this power supply with wet hands.
• Do not open the casing of the power supply when it is connected to AC power.
• Refer all servicing to qualified service personnel only.
• Before replacing the fuse, identify and fix any problems.
• Replace the fuse with a fuse of the specified type and rating.
CAUTION
• Use a grounded 3 pin AC source.
• This unit is intended for indoor use only.
• Do not operate or place this unit in direct sunlight or in a humid location
• Avoid environments where dust or dirt can enter the power supply casing.
• Do not place the power supply near a heat source.
• Before plugging into local AC mains, check the rating label at the back of the unit
for 110V or 220V operation. The model 382275 can be powered by 110V only. The
model 382276 can be powered by 220V only.
• Do not block the ventilation openings of the unit.
• This unit must be used within the specified rating; excessive continuous loading
may cause damage to the power supply.
• The gauge size of the input power cable must be at least 3 “(0.75mm) and the total
length of power cable must not exceed 118” (3m)
382275/6 V4.1 11/10
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Power Supply Description
1. Power Switch ON/OFF
2. Voltage Display
3. Current Display
4. Constant Voltage Indicator LED
5. Rear Control Indicator LED (Switches ON when in Preset, Remote Control or Set
Mode)
6. Output Voltage Control Knob (Controls both the main and auxiliary output voltage)
7. Output Current Control Knob (Controls both the main and auxiliary output current)
8. Positive Auxiliary Output Terminal (Max. 5 Amps)
9. Negative Auxiliary Output Terminal (Max. 5 Amps)
10. Constant Current Indicator LED
382275/6 V4.1 11/10
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Rear Panel Description
1. Main Output (20 Amps Max.)
2. P1, P2 and P3 Recall Switch
3. Cooling Fan for Ventilation
4. AC input Plug and Fuse
5. Remote Control Connector
6. Mode Switch
382275/6 V4.1 11/10
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