Extech 382275, 382276 User Manual
User Manual
Model 382275 (120V)
382276 (230V)
Single Output Laboratory Grade
Switching DC Power Supply
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Introduction
Congratulations on your purchase of the Extech 382275 (120V) or 382276 (230V) 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 with electric motors or for charging purposes on
electroplating equipment or similar devices. Return EMF and voltage transients generated
by electric motors can damage this power supply. This power supply was designed for use
on electronic equipment only and not intended for use on electrical equipment of any
kind.
• 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 120V or 230V
operation. The model 382275 can be powered by 120V only. The model 382276 can be powered by
230V 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)
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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
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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
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Mode Descriptions
Mode Selection
The power supply has four (4) modes of operation: NORMAL, PRESET, SET and REMOTE
CONTROL mode. Slide the Mode Selection Switch to the desired Mode. The power supply
defaults to the NORMAL Mode.
Normal Mode
Normal Mode is the factory preset mode. The power supply’s output voltage and current are
controlled by the dual action volume knobs. Push the knobs to toggle the coarse and fine
tuning; notice the subtle changes in brightness of the related LED. Adjust the knob to the
desired value first with the Coarse adjustment and then with the Fine tune adjustment. Turn
the Current knob gently in any direction to check the preset current level. The display will
resume its normal brightness after a few seconds to confirm the adjustment.
Preset Mode
In the PRESET mode, the Rear Control Light is switched ON to indicate that the panel voltage
and current controls are de-activated.
There are three preset outputs, P1, P2 and P3, selectable via the Recall Switch, located on the
rear of the power supply.
The preset values are factory set per the following table.
Presets
Output Voltage
Output Current
P1
5V
Maximum
P2
13.8V
Maximum
P3
25V
Maximum
Set Mode
In the SET mode, the Voltage and the Current values for the three presets (P1, P2, and P3) can
be programmed.
1. Set the Mode Switch located on the rear of the power supply to the “SET” position.
2. Select a preset using the Recall Switch (set to the P1, P2 or P3 position).
3. Use the front panel Voltage Control Knob to set the desired voltage value.
4. Use the front panel Current Control Knob to set the desired current value.
5. Repeat this procedure for the remaining presets if desired.
6. Move the Recall Switch from the SET to the PRESET position to store changes.
Note:
Presets reside in non-volatile memory meaning that the voltage and current settings for
each preset are retained even when the power supply is switched OFF.
Caution: Check the output voltage of the preset in use before connecting to the Load. To check a
preset value, move the Mode Switch to the PRESET position and then move the Recall Switch to
the P1, P2 or P3 position. The Voltage and Current settings for the corresponding preset will
display.
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