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OVERVIEW

Rectifier

The auxiliary rectifiers D1011~ D1014 provide bias

voltage filtered by the capacitors C102 and C103,

for the pre-regulators U101 and U102. They

provide a regulated voltage for other modules.

Main Rectifier

The main rectifier is a full wave bridge rectifier. It

provides the power after the rectifier is filtered by

the capacitor C101, and then regulated via a series-

wound regulator, which is finally delivered to the

output terminal.

Current Limiter

U104 acts as a current limiter. When the current is

over predetermined rating, U104 is activated and

decreases the current. U208 provides a reference

voltage. U206 is the inverter amplifier. U103 is a

comparator amplifier which compares reference

voltage and feedback voltage, and then delivers to

Q103, Q104, which then calibrates the output

voltage.

Overload

When the unit is overloaded, Q107 activates to

control the current magnitude of Q104, to limit the

output current. The relay control circuit controls

the power dissipation in the series-wound

regulated circuit.

GPD-3303 Series User Manual

Front Panel Overview

Display

VoltMeter

Displays CH1 or CH2 output voltage.

GPD-3303S (5 digits)

GPD-3303D (3 digits)

AmpMeter

Displays CH1 or CH2 output current.

GPD-3303S (4 digits)

GPD-3303D (3 digits)

GW Instek GPD-3303 Series User Manual

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