GW Instek GPD-3303 Series - Front Panel Overview

OVERVIEW
13
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
14
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)