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DC Power Supply
GPD-3303 Series




USER MANUAL
GW INSTEK PART NO.




This manual contains proprietary information, which is protected by
copyrights. All rights are reserved. No part of this manual may be
photocopied, reproduced or translated to another language without
prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves the
rights to change specification, equipment, and maintenance
procedures at any time without notice.

ISO-9001 CERTIFIED MANUFACTURER
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan.
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TABLE OF CONTENTS GPD-3303 Series User Manual

Error Messages .................................... 3 8 27H




Table of Contents Command List...................................... 3 9
Command Details ................................ 4 0
28H




29H




SAFETY INSTRUCTIONS .................................................. 5 FAQ ................................................................................ 4 5
30H




OVERVIEW....................................................................... 9 APPENDIX ...................................................................... 4 6 31H




Introduction........................................... 9 Fuse Replacement ................................ 4 6 32H




Series Lineup / Main Features ............. 11 Specifications ...................................... 4 7 3H




Principle of Operation.......................... 12 Declaration of Conformity .................... 4 9 34H




Front Panel Overview ........................... 14
Rear Panel Overview ............................ 17 INDEX ............................................................................ 5 035H




CV/CC Crossover Characteristics ......... 18

SETUP ........................................................................... 19
Power Up ............................................. 19
Load Cable Connection ........................ 20
Output On/Off..................................... 21
Beep On/Off ........................................ 21
Front Panel Lock .................................. 22

OPERATION .................................................................. 23
CH1/CH2 Independent Mode .............. 23
CH3 Independent Mode ....................... 25
CH1/CH2 Tracking Series Mode........... 27
CH1/CH2 Tracking Parallel Mode ........ 3 2 19H




SAVE/RECALL SETUP ..................................................... 3 4 20H




Save Setup ........................................... 3 4 21H




Recall Setup ......................................... 3 5 2H




REMOTE CONTROL ....................................................... 3 6 23H




Remote Control Setup .......................... 3 6 24H




Remote Connection Step...................... 3 7 25H




Command Syntax ................................. 3 8 26H




3 4
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SAFETY INSTRUCTIONS GPD-3303 Series User Manual



Safety Guidelines


SAFETY INSTRUCTIONS General
Guidelines

CAUTION




Do not place any heavy object on the GPD-3303
series.
Avoid severe impacts or rough handling that
leads to damaging the GPD-3303 series.
This chapter contains important safety instructions
that you must follow when operating the GPD- Do not discharge static electricity to the GPD-
3303 series and when keeping it in storage. Read 3303 series.
the following before any operation to insure your Do not block or obstruct the cooling fan vent
safety and to keep the best condition for the GPD- opening.
3303 series.
Do not perform measurement at circuits directly
connected to Mains (see note below).
Safety Symbols Do not disassemble the GPD-3303 series unless
These safety symbols may appear in this manual or on the GPD-3303 you are qualified as service personnel.
series. (Measurement categories) EN 61010-1:2001 specifies the
measurement categories and their requirements as follows. The
GPD-3303 series falls under category I.
Warning: Identifies conditions or practices that Measurement category IV is for measurement performed at the
WARNING could result in injury or loss of life. source of low-voltage installation.
Measurement category III is for measurement performed in the
Caution: Identifies conditions or practices that building installation.
CAUTION could result in damage to the GPD-3303 series or Measurement category II is for measurement performed on the
to other properties. circuits directly connected to the low voltage installation.
Measurement category I is for measurements performed on
DANGER High Voltage circuits not directly connected to Mains.

Power Supply AC Input voltage: 100V/120V/220V/230V
Attention Refer to the Manual 10%, 50/60Hz
WARNING Connect the protective grounding conductor of
Protective Conductor Terminal the AC power cord to an earth ground, to avoid
electrical shock.

Earth (ground) Terminal Fuse Fuse type: 100V/120V: T6.3A/250V,
220V/230V: T3.15A/250V
WARNING Make sure the correct type of fuse is installed
before power up.


5 6
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SAFETY INSTRUCTIONS GPD-3303 Series User Manual

To ensure fire protection, replace the fuse only Storage Location: Indoor
with the specified type and rating. environment
Relative Humidity: < 70%
Disconnect the power cord before fuse
Temperature: -10C to 70C
replacement.
Make sure the cause of fuse blowout is fixed
before fuse replacement. Power cord for the United Kingdom
When using the GPD-3303 series in the United Kingdom, make sure
Cleaning the Disconnect the power cord before cleaning. the power cord meets the following safety instructions.
GPD-3303 series
Use a soft cloth dampened in a solution of mild
NOTE: This lead/appliance must only be wired by competent persons
detergent and water. Do not spray any liquid.
Do not use chemicals or cleaners containing WARNING: THIS APPLIANCE MUST BE EARTHED
harsh products such as benzene, toluene, xylene, IMPORTANT: The wires in this lead are coloured in accordance with the
and acetone. following code:
Green/ Yellow: Earth
Operation Location: Indoor, no direct sunlight, dust free,
Blue: Neutral
Environment almost non-conductive pollution (note below)
Brown: Live (Phase)
Relative Humidity: < 80%
As the colours of the wires in main leads may not correspond with the colours
Altitude: < 2000m marking identified in your plug/appliance, proceed as follows:

Temperature: 0C to 40C The wire which is coloured Green & Yellow must be connected to the Earth
terminal marked with the letter E or by the earth symbol or coloured Green or
(Pollution Degree) EN 61010-1:2001 specifies the pollution degrees
and their requirements as follows. The GPD-3303 series falls under
Green & Yellow.
degree 2. The wire which is coloured Blue must be connected to the terminal which is
Pollution refers to "addition of foreign matter, solid, liquid, or marked with the letter N or coloured Blue or Black.
gaseous (ionized gases), that may produce a reduction of dielectric The wire which is coloured Brown must be connected to the terminal marked
strength or surface resistivity".
with the letter L or P or coloured Brown or Red.
Pollution degree 1: No pollution or only dry, non-conductive
If in doubt, consult the instructions provided with the equipment or contact the
pollution occurs. The pollution has no influence.
supplier.
Pollution degree 2: Normally only non-conductive pollution
occurs. Occasionally, however, a temporary conductivity caused This cable/appliance should be protected by a suitably rated and approved HBC
by condensation must be expected. mains fuse: refer to the rating information on the equipment and/or user
instructions for details. As a guide, cable of 0.75mm2 should be protected by a 3A
Pollution degree 3: Conductive pollution occurs, or dry, non- or 5A fuse. Larger conductors would normally require 13A types, depending on
conductive pollution occurs which becomes conductive due to
the connection method used.
condensation which is expected. In such conditions, equipment
is normally protected against exposure to direct sunlight, Any moulded mains connector that requires removal /replacement must be
precipitation, and full wind pressure, but neither temperature destroyed by removal of any fuse & fuse carrier and disposed of immediately, as
nor humidity is controlled. a plug with bared wires is hazardous if a engaged in live socket. Any re-wiring
must be carried out in accordance with the information detailed on this label.



7 8
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OVERVIEW GPD-3303 Series User Manual


Constant Voltage/ Except for CH3, each output channel is completely
Constant Current transistorized and well-regulated, and works in



OVERVIEW
constant voltage (CV) or constant current (CC)
mode. Even at the maximum output current, a
fully rated, continuously adjustable output voltage
is provided. For a big load, the power supply can
be used as a CV source; while for a small load, a
This chapter describes the GPD-3303 series in a CC source. When in the CV mode (independent or
nutshell, including its main features and front / tracking mode), output current (overload or short
rear panel introduction. After going through the circuit) can be controlled via the front panel. When
overview, follow the Setup chapter (page19) to in the CC mode (independent mode only), the
properly power up and set operation environment. maximum (ceiling) output voltage can be
controlled via the front panel. The power supply
Introduction will automatically cross over from CV to CC
operation when the output current reaches the
Overview GPD-3303, the regulated DC power supply series, target value. The power supply will automatically
are light weight, adjustable, multifunctional work cross over from CC to CV when the output voltage
stations. They have three independent outputs: reaches the target value. For more details about
two with adjustable voltage level and one with CV/CC mode operation, see page18.
fixed level selectable from 2.5V, 3.3V and 5V. The
GPD-3303 series can be used for logic circuits Automatic The front panel display (CH1, CH2) shows the
where various output voltage or current are tracking mode output voltage or current. When operating in the
needed, and for tracking mode definition systems tracking mode, the power supply will
where plus and minus voltages with insignificant automatically connect to the auto- tracking mode.
error are required.
Independent / The three output modes of GPD-3303 series, Dynamic load When used in audio production lines, the power
Tracking Series / independent, tracking series, and tracking parallel, supply will provide a continuous or dynamic load
Tracking Parallel can be selected through pressing the TRACKING connector. When the connectors are connected to
key on the front panel. In the independent mode, the position "ON", a stable DC current power will
the output voltage and current of each channel are be provided for audio power amplifiers.
controlled separately. The isolation degree, from
output terminal to chassis or from output terminal
to output terminal, is 300V. In the tracking modes,
both the CH1 and CH2 outputs are automatically
connected in series or parallel; no need to connect
output leads. In the series mode, the output
voltage is doubled; in the parallel mode, the
output current is doubled.


9 10
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OVERVIEW GPD-3303 Series User Manual


Series Lineup / Main Features Principle of Operation
Overview The power supply consists of the following.
Series Lineup AC input circuit
Model V Meter A Meter USB Tracking Error Transformer
GPD-3303D 3 digit 3 digit Yes 0.5% + 50mV of Master Bias power supply including rectifier, filter,
pre-regulator and reference voltage source
GPD-3303S 5 digit 4 digit Yes 0.5% + 10mV of Master
Main regulator circuit including the main
rectifier and filter, series regulator, current
Main Features comparator, voltage comparator, reference
voltage amplifier, remote device and relay
Performance Low noise: Cooling fan controlled by Heatsink control circuit
temperature
The block diagram below shows the circuit
Compact size, light weight arrangement. The single phase input power is
Operation Constant Voltage / Constant Current operation connected to the transformer through the input
circuit. Details of each part are described in the
Tracking Series / Tracking parallel operation
next page.
Output On/Off control
Block diagram
3 outputs: 30V/3A x 2, 2.5V/3.3V/5V/3A x 1
Digital panel control
4 sets of panel setup save/recall
Coarse and fine Voltage/Current control
Software calibration
Buzzer output
Key lock function
Protection Overload protection
Reverse polarity protection
Interface USB for remote control




11 12
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OVERVIEW GPD-3303 Series User Manual


Rectifier The auxiliary rectifiers D1011~ D1014 provide bias
voltage filtered by the capacitors C102 and C103,
Front Panel Overview
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
Display
control the current magnitude of Q104, to limit the
output current. The relay control circuit controls
VoltMeter Displays CH1 or CH2 output voltage.
the power dissipation in the series-wound
regulated circuit. GPD-3303S (5 digits) GPD-3303D (3 digits)




AmpMeter Displays CH1 or CH2 output current.
GPD-3303S (4 digits) GPD-3303D (3 digits)




13 14
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OVERVIEW GPD-3303 Series User Manual



Control Panel Terminals

Memory Keys Saves or recalls panel settings. Four Default Terminals European Terminals
settings, 1 ~ 4, are available. For
save/recall details, see page34.




CH1/CH2/Beep Selects the output channel for level
Keys adjustment. For level setting details, GND Terminal Accepts a grounding wire.
see page23. Pressing and holding
CH2 key enables beep sound. For
details, see page21.
CH1 Output Outputs CH1 voltage and current.
Parallel/Series Activates Tracking Parallel operation
Keys or Tracking Series operation, For
details, see page27.
CH1 CV/CC Indicates CH1 Constant Voltage or
Lock Key Locks or unlocks the front panel Indicator Constant Current state.
settings. For details, see page22.
42H




CH2 Output Outputs CH2 voltage and current.
Output Key Turns the output on or off.


Voltage Knobs Adjusts the output voltage level for CH2 Indicates CH2 Constant Voltage,
CH1 or CH2. Pressing the knob CV/CC/PAR Constant Current, or Tracking
switches coarse and fine level setting. Indicator Parallel operation mode.

CH3 Output Outputs CH3 voltage and current.
Current Knobs Adjusts the output current level for
CH1 or CH2. Pressing the knob
switches coarse and fine level setting.
CH3 Overload Indicates when CH3 output current is
Indicator overloaded.
Power Switch Turns On or Off the main power.
For power up sequence, see page19.
CH3 Voltage Selects CH3 output voltage: 2.5V,
43H




Selector 3.3V, or 5V.

15 16
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OVERVIEW GPD-3303 Series User Manual


Rear Panel Overview CV/CC Crossover Characteristics
Power Cord /
Background The GPD-3303 series automatically switches
USB Connector Cooling Fan Fuse Socket AC Selector between constant voltage mode (CV) and constant
current mode (CC), according to load condition.

CV mode When the current level is smaller than the output
setting, the GPD-3303 series operates in Constant
Voltage mode. The indicator on the front panel
turns green (C.V.) The Voltage level is kept at the
setting and the Current level fluctuates according
to the load condition until it reaches the output
current setting.

CC mode When the current level reaches the output setting,
the GPD-3303 series starts operating in Constant
Current mode. The indicator on the front panel
turns red (C.C.) The Current level is kept at the
setting but the Voltage level becomes lower than
the setting, in order to suppress the output power
level from overload. When the current level
becomes lower than the setting, the GPD-3303
USB Connector Accepts a USB slave connector for series goes back to the Constant Voltage mode.
command-based remote control
(page36). Diagram Vout

Power Cord / The power cord socket accepts the
Vmax
Fuse Socket AC mains: 115V/230V, 50/60Hz.
For power up details, see page19. Constant
Voltage
The fuse holder contains the AC
main fuse. For fuse replacement
details, see page46. Constant
Current
AC Selector Selects AC voltage: 100V/ 120V/
220V/ 230V. Iout
Imax




17 18
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SETUP GPD-3303 Series User Manual


Load Cable Connection

SETUP GTL-104 1. Turn the terminal
counterclockwise and loosen
the screw.

This chapter describes how to properly power up 2. Insert the cable terminal.
and configure the GPD-3303 series before
operation. 3. Turn the terminal clockwise
and tighten the screw.
Power Up
Select AC voltage Before powering up the power
GTL-105 Insert the plug into the socket.
supply, select the AC input
voltage from the rear panel.



Connect AC Connect the AC power cord to GTL-203, 204 Insert the plug into the terminal.
power cord the rear panel socket.




Power On Press the Power switch to turn Wire type When using load cables other than the attached,
on the power. The display shows make sure they have enough current capacity for
the initialization screen with the minimizing cable loss and load line impedance.
model name, followed by the Voltage drop across a wire should not excess 0.5V.
last recalled settings. The following list is the wire current rating at
450A/cm2.
Wire size (AWG) Maximum current (A)
20 2.5
18 4
16 6
Power Off Press the Power switch again to
turn off the power. 14 10
12 16

19 20
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SETUP GPD-3303 Series User Manual


Output On/Off Front Panel Lock
Panel operation Pressing the Output key turns Panel operation Press the LOCK key to lock
on all CH 1/2/3 outputs. the front panel key
The key LED also turns on. Pressing the Output operation. The key LED
key again turns the output and the key LED off. turns on. To unlock, press the LOCK key for 2
seconds. The key LED also turns off.
Automatic output Any of the following actions during output on
off automatically turns it off. They might involve Note The OUTPUT key is not
sudden and harmful change in the output level. affected by the lock
operation.
Change the operation mode between
independent / tracking series / tracking parallel
Recalling other setups from the memory
Storing the setup into the memory


Beep On/Off
Panel operation By default, the beep sound is
enabled. To turn off the beep,
press the CH2 key for 2 seconds.
A beep comes out and the beep setting will be
turned off. To enable the beep, press the CH2 key
again for 2 seconds.

List of beep The following operations beep when the beep
setting is on.
Power on Output on/off
INDEP SER PARA Panel lock/unlock
mode switching
CH1/CH2 output
Setup save/recall level knob switching
Voltage/current knob Voltage/current level
fine/coarse switching reaching minimum
(zero) level



21 22
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OPERATION GPD-3303 Series User Manual




OPERATION
CH1/CH2 Independent Mode Note: this diagram shows non-European terminals.

Background / CH1 and CH2 outputs work independent of each 3. Set the CH1 output voltage (For CH1)
Connection other. and current. Press the CH1
key (LED turns on) and then
use the Voltage and Current
knob.
By default, the Voltage and
Current knob work in the
coarse mode. To activate the (Fine control)
fine mode, press the knob to
turn the FINE LED on.


Coarse: 0.1V or 0.1A @ rotation click
Fine: the smallest digit @ rotation click

4. Repeat the above settings for the CH2.

5. To turn on the output, press
the output key. The key
Output rating 0 ~ 30V/0~3A for each channel LED turns on and the CH1 /
CH2 indicator shows the (CH1)
Panel operation 1. Make sure the PARA/ output mode, CV or CC.
INDEP and SER/INDEP
keys are turned off (the key (CH2)
LEDs are off).

2. Connect the load to the front panel terminals,
CH1 +/-, CH2 +/-.


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OPERATION GPD-3303 Series User Manual


3. To turn on the output, press
CH3 Independent Mode the output key. The key
Background / The CH3 rating is 2.5V/3.3V/5V, 3A fixed. It LED turns on.
Connection works independently from CH1 and CH2,
regardless of their modes. CV CC When the output Current level
exceeds 3A, the overload
indicator turns red and CH3
operation mode switches from
Constant Voltage to Constant
Current.
Note: "overload" in this case does not mean an
abnormal operation.




Output rating 2.5V/3.3V/5V, 3A fixed

No Tracking CH3 does not have tracking series/parallel mode.
Series/Parallel Also, CH3 output is not affected by CH1 and CH2
modes.

Panel operation 1. Connect the load to the front
panel CH3 +/- terminal.
(the diagram shows non-
European terminals)


2. Select the output voltage,
2.5V/3.3V/5V using the
CH3 voltage selector key.



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OPERATION GPD-3303 Series User Manual


2. Connect the load to the front panel terminals,
CH1/CH2 Tracking Series Mode CH1+ & CH2- (Single supply).
Background Tracking series operation doubles the Voltage
capacity of the GPD-3303 series by internally
connecting CH1 (Master) and CH2 (Slave) in serial
and combining the output to a single channel. CH1
(Master) controls the combined Voltage output
level.
The following describes two type of configurations
depending on the common ground usage.
Note: this diagram shows non-European terminals.
Tracking series without common terminal
3. Press the CH2 key (LED
turns on) and then use the
Connection Current knob to set the CH2
output current to the
maximum level (3.0A).
By default, the Voltage and
(Fine control)
Current knob work in the
coarse mode. To activate the
fine mode, press the knob to
turn the FINE LED on.
Coarse: 0.1V or 0.1A @ rotation click
Fine: the smallest digit @ rotation click

4. Press the CH1 key (LED
turns on) and then use the
Voltage and Current knob
to set the output voltage
and current level.
Output rating 0 ~ 60V/0 ~ 3A
5. To turn on the output, press
1. Press the SER/INDEP key the output key. The key LED
to activate the tracking turns on.
series mode. The key LED
turns on.
6. Refer to the CH1 (Master) meter and indicator
for the output setting level and CV/CC status.

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OPERATION GPD-3303 Series User Manual


1. Press the SER/INDEP key to
activate the tracking series
mode. The key LED turns on.

2. Connect the load to the front panel terminals,
CH1+ & CH2-. Use the CH1 (-) terminal as the
Voltage level Double the reading on the CH1 common line connection.
Voltage meter. In the above
case, the actual output is 20.0 x 2
= 40.0V.
Current level CH1 meter reading shows the
output Current. In the above
case, 2.000A. (CH2 Current
control must be in the
Note: this diagram shows non-European terminals.
Maximum position=3.0A).
3. Press the CH1 key (LED turns
Tracking series with common terminal on) and use the Voltage knob
to set the master & slave (master & slave)
Connection output voltage (the same level
for both channels).
By default, the Voltage and
Current knob work in the (Fine control)
coarse mode. To activate the
fine mode, press the knob to
turn the FINE LED on.

Coarse: 0.1V or 0.1A @ rotation click
Fine: the smallest digit @ rotation click

4. Use the Current knob to set
the master output current.


5. To turn on the output (and
Output rating 0~30V/0~3A for CH1 ~ COM LED), press the output key.

0~30V/0~3A for CH2 ~ COM


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OPERATION GPD-3303 Series User Manual


6. For the master (CH1) output level and CV/CC
status, refer to the CH1 meter and indicator.
CH1/CH2 Tracking Parallel Mode
Background / Tracking parallel operation doubles the current
Connection capacity of the GPD-3303 series by internally
connecting CH1 and CH2 in parallel and
combining the output to a single channel. CH1
controls the combined output.


Master (CH1) CH1 meter reading shows the
voltage level output voltage. In the above case,
20.0V.
Master (CH1) CH1 meter reading shows the
current level output current. In the above case,
2.000A.

7. Press the CH2 key (LED turns
on) and use the Current knob
to set the slave output current.



8. For the slave (CH2) output level and CV/CC
status, refer to the CH1/CH2 meter and CH2 Output rating 0 ~ 30V/0 ~ 6A
indicator.
1. Press the PARA/INDEP key
to activate the tracking
parallel mode. The key LED
turns on.

2. Connect the load to the CH1 +/- terminals.

Slave (CH2) The CH2 meter reading shows
voltage level the output voltage. In the above
case, 20.0V.
Slave (CH2) The CH2 meter reading shows
current level the output current. In the above
case, 3.000A. Note: this diagram shows non-European terminals.

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OPERATION GPD-3303 Series User Manual


3. To turn on the output, press
the output key. The key


SAVE/RECALL SETUP
LED turns on.

4. The CH2 indicator turns
red, indicating tracking
parallel (PARA) mode.

5. Press the CH1 key (LED
Save Setup
turns on) and then use the Background The front panel settings can be stored into one of
Voltage and Current knob the four internal memories.
to set the output voltage
and current. The CH2
Contents The following list shows the setup contents.
output control is disabled.
By default, the Voltage and (Fine control) Independent / tracking series / tracking parallel
Current knob work in the mode
coarse mode. To activate the CH1/CH2 knob selection
fine mode, press the knob to
turn the FINE LED on. Fine/coarse editing mode
Output voltage/current level
6. For the output level and CV/CC status, refer to
the CH1 meter and indicator. The following settings are always saved as "off".
Output on/off
Front panel lock/unlock

Panel operation Press one of the 1~4 Memory
keys for 2 seconds, for example
memory 1. The panel settings
are saved in memory 1 and the
Voltage level The CH1 meter reading shows
key LED turns on. When the
the output voltage. In the above
panel settings are modified, the
case, 20.0V.
LED turns off.
Current level Double the amount of CH1
current meter reading. In the Note When a setting is stored, the output automatically
above case, 2.0A x 2 = 4.0A. turns off.




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SAVE/RECALL SETUP GPD-3303 Series User Manual


Recall Setup
The front panel settings can be recalled from one of

REMOTE CONTROL
Background
the four internal memories.

Contents The following list shows the setup contents.
Independent / tracking series / tracking parallel
mode Remote Control Setup
CH1/CH2 knob selection Background The GPD-3303D and GPD-3303S are capable of
Fine/coarse editing mode being remotely controlled via the USB connection.
Output voltage/current level
Interface USB slav