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DC Power Supply
GPD-3303 Series
USER MANUAL
GW INSTEK PART NO.
ISO-9001 CERTIFIED MANUFACTURER
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.
Good Will Instrument Co., Ltd.
No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan.
TABLE OF CONTENTS
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Table of Contents
GPD-3303 Series User Manual
Error Messages ....................................27H38
Command List......................................28H39
Command Details ................................ 29H40
SAFETY INSTRUCTIONS .................................................. 5
OVERVIEW....................................................................... 9
Introduction........................................... 9
Series Lineup / Main Features ............. 11
Principle of Operation.......................... 12
Front Panel Overview........................... 14
Rear Panel Overview ............................ 17
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 ........19H32
FAQ................................................................................30H45
APPENDIX......................................................................31H46
Fuse Replacement................................ 32H46
Specifications ......................................33H47
Declaration of Conformity.................... 34H49
INDEX ............................................................................35H50
SAVE/RECALL SETUP ..................................................... 20H34
Save Setup ...........................................21H34
Recall Setup......................................... 22H35
REMOTE CONTROL....................................................... 23H36
Remote Control Setup.......................... 24H36
Remote Connection Step...................... 25H37
Command Syntax ................................. 26H38
3
4
SAFETY INSTRUCTIONS
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GPD-3303 Series User Manual
SAFETY INSTRUCTIONS
This chapter contains important safety instructions
that you must follow when operating the GPD3303 series and when keeping it in storage. Read
the following before any operation to insure your
safety and to keep the best condition for the GPD3303 series.
Safety Symbols
These safety symbols may appear in this manual or on the GPD-3303
series.
WARNING
CAUTION
Warning: Identifies conditions or practices that
could result in injury or loss of life.
Caution: Identifies conditions or practices that
could result in damage to the GPD-3303 series or
to other properties.
DANGER High Voltage
Attention Refer to the Manual
Protective Conductor Terminal
Safety Guidelines
General
Guidelines
CAUTION
Power Supply
WARNING
• 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.
• Do not discharge static electricity to the GPD-
3303 series.
• Do not block or obstruct the cooling fan vent
opening.
• Do not perform measurement at circuits directly
connected to Mains (see note below).
• Do not disassemble the GPD-3303 series unless
you are qualified as service personnel.
(Measurement categories) EN 61010-1:2001 specifies the
measurement categories and their requirements as follows. The
GPD-3303 series falls under category I.
• Measurement category IV is for measurement performed at the
source of low-voltage installation.
• Measurement category III is for measurement performed in the
building installation.
• Measurement category II is for measurement performed on the
circuits directly connected to the low voltage installation.
• Measurement category I is for measurements performed on
circuits not directly connected to Mains.
• AC Input voltage: 100V/120V/220V/230V
±10%, 50/60Hz
• Connect the protective grounding conductor of
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
SAFETY INSTRUCTIONS
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GPD-3303 Series User Manual
Cleaning the
GPD-3303 series
Operation
Environment
• To ensure fire protection, replace the fuse only
with the specified type and rating.
• Disconnect the power cord before fuse
replacement.
• Make sure the cause of fuse blowout is fixed
before fuse replacement.
• Disconnect the power cord before cleaning.
• Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid.
• Do not use chemicals or cleaners containing
harsh products such as benzene, toluene, xylene,
and acetone.
• Location: Indoor, no direct sunlight, dust free,
almost non-conductive pollution (note below)
• Relative Humidity: < 80%
• Altitude: < 2000m
• Temperature: 0°C to 40°C
(Pollution Degree) EN 61010-1:2001 specifies the pollution degrees
and their requirements as follows. The GPD-3303 series falls under
degree 2.
Pollution refers to “addition of foreign matter, solid, liquid, or
gaseous (ionized gases), that may produce a reduction of dielectric
strength or surface resistivity”.
• Pollution degree 1: No pollution or only dry, non-conductive
pollution occurs. The pollution has no influence.
• Pollution degree 2: Normally only non-conductive pollution
occurs. Occasionally, however, a temporary conductivity caused
by condensation must be expected.
• Pollution degree 3: Conductive pollution occurs, or dry, non-
conductive pollution occurs which becomes conductive due to
condensation which is expected. In such conditions, equipment
is normally protected against exposure to direct sunlight,
precipitation, and full wind pressure, but neither temperature
nor humidity is controlled.
Storage
environment
• Location: Indoor
• Relative Humidity: < 70%
• Temperature: −10°C to 70°C
Power cord for the United Kingdom
When using the GPD-3303 series in the United Kingdom, make sure
the power cord meets the following safety instructions.
NOTE: This lead/appliance must only be wired by competent persons
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT: The wires in this lead are coloured in accordance with the
following code:
Green/ Yellow: Earth
Blue: Neutral
Brown: Live (Phase)
As the colours of the wires in main leads may not correspond with the colours
marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth
terminal marked with the letter E or by the earth symbol
Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is
marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked
with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact the
supplier.
This cable/appliance should be protected by a suitably rated and approved HBC
mains fuse: refer to the rating information on the equipment and/or user
instructions for details. As a guide, cable of 0.75mm
or 5A fuse. Larger conductors would normally require 13A types, depending on
the connection method used.
Any moulded mains connector that requires removal /replacement must be
destroyed by removal of any fuse & fuse carrier and disposed of immediately, as
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.
or coloured Green or
2
should be protected by a 3A
7
8
OVERVIEW
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GPD-3303 Series User Manual
OVERVIEW
This chapter describes the GPD-3303 series in a
nutshell, including its main features and front /
rear panel introduction. After going through the
overview, follow the Setup chapter (page19) to
properly pow
Introduction
Overview
Independent /
Trac ki ng S er ie s /
Tracking Parallel
GPD-3303, the regulated DC power supply series,
are light weight, adjustable, multifunctional work
stations. They have three independent outputs:
two with adjustable voltage level and one with
fixed level selectable from 2.5V, 3.3V and 5V. The
GPD-3303 series can be used for logic circuits
where various output voltage or current are
needed, and for tracking mode definition systems
where plus and minus voltages with insignificant
error are required.
The three output modes of GPD-3303 series,
independent, tracking series, and tracking parallel,
can be selected through pressing the TRACKING
key on the front panel. In the independent mode,
the output voltage and current of each channel are
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.
er up and set operation environment.
Constant Voltage/
Constant Current
matic
Auto
tracking mode
Dynamic load
Except for CH3, each output channel is completely
transistorized and well-regulated, and works in
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
CC source. When in the CV mode (independent or
tracking mode), output current (overload or short
circuit) can be controlled via the front panel. When
in the CC mode (independent mode only), the
maximum (ceiling) output voltage can be
controlled via the front panel. The power supply
will automatically cross over from CV to CC
operation when the output current reaches the
target value. The power supply will automatically
cross over from CC to CV when the output voltage
reaches the target value. For more details about
CV/CC mode operation, see page18.
The front panel display (CH1, CH2) shows the
output voltage or current. When operating in the
tracking mode, the power supply will
automatically connect to the auto- tracking mode.
When used in audio production lines, the power
supply will provide a continuous or dynamic load
connector. When the connectors are connected to
the position “ON”, a stable DC current power will
be provided for audio power amplifiers.
9
10
OVERVIEW
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GPD-3303 Series User Manual
Series Lineup / Main Features
Series Lineup
Model V Meter A Meter USB Tracking Error
GPD-3303D 3 digit 3 digit Yes
GPD-3303S 5 digit 4 digit Yes
Main Features
Performance
Operation
• Low noise: Cooling fan controlled by Heatsink
temperature
• Compact size, light weight
• Constant Voltage / Constant Current operation
• Tracking Series / Tracking parallel operation
• Output On/Off control
• 3 outputs: 30V/3A x 2, 2.5V/3.3V/5V/3A x 1
• Digital panel control
• 4 sets of panel setup save/recall
≤ 0.5% + 50mV of Master
≤ 0.5% + 10mV of Master
Principle of Operation
Overview
Block diagram
The power supply consists of the following.
• AC input circuit
• Transformer
• Bias power supply including rectifier, filter,
pre-regulator and reference voltage source
• Main regulator circuit including the main
rectifier and filter, series regulator, current
comparator, voltage comparator, reference
voltage amplifier, remote device and relay
control circuit
The block diagram below shows the circuit
arrangement. The single phase input power is
connected to the transformer through the input
circuit. Details of each part are described in the
next page.
• Coarse and fine Voltage/Current control
• Software calibration
• Buzzer output
• Key lock function
Protection
Interface
• Overload protection
• Reverse polarity protection
• USB for remote control
11
12
OVERVIEW
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GPD-3303 Series User Manual
Rectifier
Main Rectifier
Current Limiter
Overload
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.
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 serieswound regulator, which is finally delivered to the
output terminal.
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.
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.
Front Panel Overview
Display
Vol tMeter
GPD-3303S (5 digits)
Displays CH1 or CH2 output voltage.
GPD-3303D (3 digits)
13
AmpMeter
GPD-3303S (4 digits)
14
Displays CH1 or CH2 output current.
GPD-3303D (3 digits)
OVERVIEW
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GPD-3303 Series User Manual
Control Panel
Memory Keys
CH1/CH2/Beep
ys
Ke
Parallel/Se
ries
Keys
Lock Key
Output Key
Saves or recalls panel settings. Four
settings, 1 ~ 4, are available. For
save/recall details, see page34.
Selects the output channel for level
adjustment. For level setting details,
see page23. Pressing and holding
CH2 key enab
les beep sound. For
details, see page21.
Activates Tracking Parallel operation
or Tracking Series operation, For
details, see page27.
Locks or unlocks the front panel
settings. For details, see page
42H22.
Turns the output on or off.
Te rm in al s
Default Terminals
GND Terminal
CH1 Output
CH1 CV/CC
Indicator
CH2 Output
European Terminals
Accepts a grounding wire.
Outputs CH1 voltage and current.
Indicates CH1 Constant Voltage or
Constant Current state.
Outputs CH2 voltage and current.
Vol t a g e K nobs
Adjusts the output voltage level for
CH1 or CH2. Pressing the knob
switches coarse and fine level setting.
Current Knobs
Adjusts the output current level for
CH1 or CH2. Pressing the knob
switches coarse and fine level setting.
Power Switch
Turns On
or Off the main power.
For power up sequence, see page
43H19.
15
CH2
CV/CC/PAR
Indicator
CH3 Output
CH3 Overload
Indicator
CH3 Voltage
Selector
16
Indicates CH2 Constant Voltage,
Constant Current, or Tracking
Parallel operation mode.
Outputs CH3 voltage and current.
Indicates when CH3 output current is
overloaded.
Selects CH3 output voltage: 2.5V,
3.3V, or 5V.
OVERVIEW
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GPD-3303 Series User Manual
Rear Panel Overview
USB Connector AC SelectorCooling Fan
USB Connector
Power Cord /
Fuse Socket
Accepts a USB slave connector for
command-based remote control
(page36).
CV/CC Crossover Characteristics
Background
CV mode
CC mode
Diagram
The GPD-3303 series automatically switches
between constant voltage mode (CV) and constant
current mode (CC), according to load condition.
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.
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
series goes back to the Constant Voltage mode.
Vout
Power Co
Fuse Socket
rd /
The power cord socket accepts the
AC mains: 115V/230V, 50/60Hz.
For power up details, see page19.
The
fuse holder contains the AC
main fuse. For fuse replacement
details, see page46.
AC Sele
ctor
Selects AC voltage: 100V/ 120V/
220V/ 230V.
17
18
Vmax
Constant
Voltage
Constant
Current
Imax
Iout
SETUP
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GPD-3303 Series User Manual
SETUP
This chapter describes how to properly power up
and configure the GPD-3303 series before
operation.
Power Up
Select AC voltage
Connect AC
power cord
Before powering up the power
supply, select the AC input
voltage from the rear panel.
Connect the AC power cord to
the rear panel socket.
Load Cable Connection
GTL-104
GTL-105
GTL-203, 204
1. Turn the terminal
counterclockwise and loosen
the screw.
2. Insert the cable terminal.
3. Turn the terminal clockwise
and tighten the screw.
Insert the plug into the socket.
Insert the plug into the terminal.
Power On
Power Off
Press the Power switch to turn
on the power. The display shows
the initialization screen with the
model name, followed by the
last recalled settings.
Press the Power switch again to
turn off the power.
Wire type
Wire size (AWG) Maximum current (A)
20 2.5
16 6
19
12 16
20
When using load cables other than the attached,
make sure they have enough current capacity for
minimizing cable loss and load line impedance.
Voltage drop across a wire should not excess 0.5V.
The following list is the wire current rating at
450A/cm
18 4
14 10
2
.
SETUP
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GPD-3303 Series User Manual
Output On/Off
Panel operation
Automatic output
off
Pressing the Output key turns
on all CH 1/2/3 outputs.
The key LED also turns on. Pressing the Output
key again turns the output and the key LED off.
Any of the following actions during output on
automatically turns it off. They might involve
sudden and harmful change in the output level.
• 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.
Panel operation
Press the LOCK key to lock
the front panel key
operation. The key LED
turns on. To unlock, press the LOCK key for 2
seconds. The key LED also turns off.
Note
The OUTPUT key is not
affected by the lock
operation.
Front Panel Lock
List of beep
The following operations beep when the beep
setting is on.
• Power on
• INDEP – SER – PARA
mode switching
• Setup save/recall
• Voltage/current knob
fine/coarse switching
• Output on/off
• Panel lock/unlock
• CH1/CH2 output
level knob switching
• Voltage/current level
reaching minimum
(zero) level
21
22
OPERATION
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OPERATION
CH1/CH2 Independent Mode
Background /
Connection
CH1 and CH2 outputs work independent of each
other.
GPD-3303 Series User Manual
Note: this diagram shows non-European terminals.
3. Set the CH1 output voltage
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 mode, press the knob to
turn the FINE LED on.
• Coarse: 0.1V or 0.1A @ rotation click
• Fine: the smallest digit @ rotation click
(For CH1)
(Fine control)
Output rating
Panel operation
0 ~ 30V/0~3A for each channel
1. Make sure the PARA/
INDEP and SER/INDEP
keys are turned off (the key
LEDs are off).
2. Connect the load to the front panel terminals,
CH1 +/−, CH2 +/−.
23
24
4. Repeat the above settings for the CH2.
5. To turn on the output, press
the output key. The key
LED turns on and the CH1 /
CH2 indicator shows the
output mode, CV or CC.
(CH1)
(CH2)
OPERATION
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GPD-3303 Series User Manual
CH3 Independent Mode
Background /
Connection
Output rating
The CH3 rating is 2.5V/3.3V/5V, 3A fixed. It
works independently from CH1 and CH2,
regardless of their modes.
2.5V/3.3V/5V, 3A fixed
CV → CC
3. To turn on the output, press
the output key. The key
LED turns on.
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.
No Tracking
Series/Parallel
Panel operation
CH3 does not have tracking series/parallel mode.
Also, CH3 output is not affected by CH1 and CH2
modes.
1. Connect the load to the front
panel CH3 +/− terminal.
(the diagram shows nonEuropean terminals)
2. Select the output voltage,
2.5V/3.3V/5V using the
CH3 voltage selector key.
25
26
OPERATION
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GPD-3303 Series User Manual
CH1/CH2 Tracking Series Mode
Background
Tracking series without common terminal
Connection
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.
2. Connect the load to the front panel terminals,
CH1+ & CH2− (Single supply).
Note: this diagram shows non-European terminals.
3. Press the CH2 key (LED
turns on) and then use the
Current knob to set the CH2
output current to the
maximum level (3.0A).
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
Output rating
0 ~ 60V/0 ~ 3A
1. Press the SER/INDEP key
to activate the tracking
series mode. The key LED
turns on.
27
4. Press the CH1 key (LED
turns on) and then use the
Voltage and Current knob
to set the output voltage
and current level.
5. To turn on the output, press
the output key. The key LED
turns on.
6. Refer to the CH1 (Master) meter and indicator
for the output setting level and CV/CC status.
28
OPERATION
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GPD-3303 Series User Manual
Voltage level
Double the reading on the CH1
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
Maximum position=3.0A).
Tracking series with common terminal
Connection
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
common line connection.
Note: this diagram shows non-European terminals.
3. Press the CH1 key (LED turns
on) and use the Voltage knob
to set the master & slave
(master & slave)
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
Output rating
0~30V/0~3A for CH1 ~ COM
0~–30V/0~3A for CH2 ~ COM
4. Use the Current knob to set
the master output current.
29
30
5. To turn on the output (and
LED), press the output key.
OPERATION
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GPD-3303 Series User Manual
Master (CH1)
Master (CH1)
6. For the master (CH1) output level and CV/CC
status, refer to the CH1 meter and indicator.
CH1 meter reading shows the
voltage level
current level
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
indicator.
output voltage. In the above case,
20.0V.
CH1 meter reading shows the
output current. In the above case,
2.000A.
CH1/CH2 Tracking Parallel Mode
Background /
Connection
Output rating
Tracking parallel operation doubles the current
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.
0 ~ 30V/0 ~ 6A
1. Press the PARA/INDEP key
to activate the tracking
parallel mode. The key LED
turns on.
Slave (CH2)
voltage level
Slave (CH2)
current level
The CH2 meter reading shows
the output voltage. In the above
case, 20.0V.
The CH2 meter reading shows
the output current. In the above
case, 3.000A.
31
32
2. Connect the load to the CH1 +/− terminals.
Note: this diagram shows non-European terminals.
OPERATION
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GPD-3303 Series User Manual
3. To turn on the output, press
the output key. The key
LED turns on.
4. The CH2 indicator turns
red, indicating tracking
parallel (PARA) mode.
5. Press the CH1 key (LED
turns on) and then use the
Voltage and Current knob
to set the output voltage
and current. The CH2
output control is disabled.
By default, the Voltage and
Current knob work in the
coarse mode. To activate the
fine mode, press the knob to
turn the FINE LED on.
6. For the output level and CV/CC status, refer to
the CH1 meter and indicator.
(Fine control)
SAVE/RECALL SETUP
Save Setup
Background
Contents
The front panel settings can be stored into one of
the four internal memories.
The following list shows the setup contents.
• Independent / tracking series / tracking parallel
mode
• CH1/CH2 knob selection
• Fine/coarse editing mode
• Output voltage/current level
The following settings are always saved as “off”.
• Output on/off
• Front panel lock/unlock
Voltage level
Current level
The CH1 meter reading shows
the output voltage. In the above
case, 20.0V.
Double the amount of CH1
current meter reading. In the
above case, 2.0A x 2 = 4.0A.
33
Panel operation
Note
34
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
key LED turns on. When the
panel settings are modified, the
LED turns off.
When a setting is stored, the output automatically
turns off.
SAVE/RECALL SETUP
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GPD-3303 Series User Manual
Recall Setup
Background
Contents
Panel operation
The front panel settings can be recalled from one of
the four internal memories.
The following list shows the setup contents.
• Independent / tracking series / tracking parallel
mode
• CH1/CH2 knob selection
• Fine/coarse editing mode
• Output voltage/current level
The following settings are always recalled as “off”.
• Output on/off
• Front panel lock/unlock
Press one of the 1~4 Memory
keys, for example memory 1.
The panel settings saved in
memory 1 are recalled. The key
LED turns on. When the panel
settings are modified, the LED
turns off.
REMOTE CONTROL
Remote Control Setup
Background
Interface
COM setting
The GPD-3303D and GPD-3303S are capable of
being remotely controlled via the USB connection.
USB slave port, rear panel
Set up the COM port inside the PC according to
the following list.
• Baud rate: 9600
• Parity bit: None
• Data bit: 8
• Stop bit: 1
• Data flow control: None
Note
When a setting is recalled, the output
automatically turns off.
35
Functionality
check
36
Run this query command via the terminal
application such as MTTTY (Multi-threaded TTY).
*IDN?
This should return the identification information:
Manufacturer, model name, serial number,
firmware version.
GW INSTEK, GPD-3303x, SN: xxxxxxxx, Vx.xx
REMOTE CONTROL
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GPD-3303 Series User Manual
Remote Connection Step
Entering the
remote control
mode
Leaving the
remote control
mode
1. Connect the USB cable to the slave port.
2. The connection will be automatically
established, and the front panel shows
“USB…YES” message.
3. The power supply also automatically enters the
lock state (the Lock key will become activated).
1. Disconnect the USB cable from the rear.
2. The display shows “USB…NO” message.
Command format
Output channel
Parameter Type Description Example
<Boolean>
<NR1>
<NR2>
Note
1 (CH1) or 2 (CH2)
boolean logic 0 (off), 1 (on)
integers 0, 1, 2, 3
decimal numbers
Commands are not case-sensitive.
1: command header
2: output channel
3: separator
4: parameter
0.1, 3.14, 8.5
Error Messages
Command Syntax
The following error messages might appear when the GPS-3303D or
3303S cannot accept the command.
Message contents Descriptions
Program mnemonic
too long
The command length must be 15 characters
or less.
3. Unlock the power supply by keep pressing the
Lock key until it turns off.
4. The power supply goes back to the local
operation mode.
Invalid character
37
Missing parameter
Data out of range
Command not allowed
Undefined header
38
Invalid characters, such as symbols, are
entered. Example: VOUT#
The parameter is missing from the command.
Example: VSET: (should have a number)
The entered value exceeds the specification.
Example: VSET:33 (should be ≤ 32V)
The entered command is not allowed in the
circumstance. Example: trying to set CH2
output while in the tracking mode.
The entered command does not exist, or the
syntax is wrong.
REMOTE CONTROL
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Command List
• Detailed descriptions of each command start from the next page.
• The “HELP” command shows all the below commands and their
meanings, except for the HELP command itself.
ISET<X>:<NR2>
ISET<X>?
Sets the output current.
Returns the output current setting.
GPD-3303 Series User Manual
Command Details
ISET<X>:<NR2>
Description
Panel operation
Sets the output current.
See page23
VSET<X>:<NR2>
VSET<X>?
IOUT<X>?
VOUT<X>?
TRACK<NR1>
BEEP<BOOLEAN>
OUT<BOOLEAN>
STATUS?
*IDN?
RCL<NR1>
SAV<NR1>
HELP?
ERR?
Sets the output voltage.
Returns the output voltage setting.
Returns the actual output current.
Returns the actual output voltage.
Selects the operation mode.
Turn on or off the beep.
Turn on or off the output.
Returns the GPS-3303D or GPS-3303S status.
Returns the GPS-3303D or GPD-3303S
identification.
Recalls a panel setting.
Saves the panel setting.
Shows the command list.
Returns the instrument error messages.
Response time
Example ISET1:2.234
Minimum 70ms
ISET1:2.23
Sets the CH1 output current to
2.234A (for GPD-3303S)
Sets the CH1 output current to
2.23A (for GPD-3303D)
ISET<X>?
Description
Panel operation
Response time
Example ISET1?
Returns the output current setting.
See page23
Minimum 80ms
Returns the CH1 output current setting
VSET<X>:<NR2>
Description
Panel operation
Response time
Example VSET1:20.345
Sets the output voltage.
See page23
Minimum 70ms
Sets the CH1 voltage to 20.345V
VSET1:20.3
(for GPD-3303S)
Sets the CH1 voltage to 20.3V
(for GPD-3303D)
39
40
REMOTE CONTROL
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GPD-3303 Series User Manual
VSET<X>?
Description
Response time
Example VSET1?
Returns the output voltage setting.
Minimum 80ms
IOUT<X>?
Description
Response time
Example IOUT1?
Returns the actual output current.
Minimum 80ms
VOUT<X>?
Description
Panel operation
Response time
Example VOUT1?
Returns the actual output voltage.
See page23
Minimum 80ms
TRACK<NR1>
Description
Panel operation
NR1
Response time
Selects the operation mode: independent, tracking
series, or tracking parallel.
See page27
0: Independent
1: Tracking series
2: Tracking parallel
Minimum 70ms
Returns the CH1 voltage setting
Returns the CH1 output current
Returns the CH1 output voltage
Description
Panel operation
Response time
Example BEEP1
Turns the beep on or off.
See page21
Minimum 70ms
Turns on the beep
OUT<Boolean>
BEEP<Boolean>
Description
Panel operation
Response time
Example OUT1
Turns on or off the output.
See page21
Minimum 70ms
Turns on the output
STATUS?
Description
Response time
Contents
Returns the GPD-3303D or GPD-3303S status.
Minimum 400ms
8 bits in the following format
Bit Item Description
0 CH1 0=CC mode, 1=CV mode
1 CH2 0=CC mode, 1=CV mode
2, 3 Tracking 01=Independent, 11=Tracking series,
10=Tracking parallel
4 Beep 0=Off, 1=On
5 N/A N/A
6 Output 0=Off, 1=On
7 N/A N/A
Example TRACK0
Selects the independent mode
41
42
REMOTE CONTROL
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*IDN?
Description
Response time
Contents
Returns the GPD-3303D or GPD-3303S
identification.
Minimum 300ms
GW INSTEK,GPD-3303x,SN: xxxxxxxx, Vx.xx
(Manufacturer, model name, serial number,
firmware version)
RCL<NR1>
Description
Panel operation
NR1
Response time
Example RCL1
Recalls a panel setting.
See page35
1 – 4: Memory 1 to 4
Minimum 70ms
SAV<NR1>
Description
Panel operation
Stores the panel setting.
See page34
Recalls the panel setting stored
in memory 1
GPD-3303 Series User Manual
Contents
ISET<x>:<NR2> Sets the value of current.
VSET<x>:<NR2> Sets the value of voltage. x:1=CH1,2=CH2.
ISET<x>? Return the value of current.
VSET<x>? Return the value of voltage.
IOUT<x>? Returns actual output current，
VOUT<x>? Returns actual output voltage.
TRACK<NR1> Sets the output of the power supply working on
independent or tracking mode. NR1:0=INDEP,1=SER,2=PARA;
BEEP<Boolean> Sets the BEEP state on or off.
OUT<Boolean> Sets the output state on or off.
STATUS? Returns the power supply state.
bit0:(CH1)0=CC,1=CV;bit1:(CH2)0=CC,1=CV;bit23=(TRACK)01=INDEP,1
1=SER,10=PARA;bit4:(BEEP)0=OFF,1=ON;bit6:(OUT)0=OFF,1=ON;
*IDN? Returns instrument identification.
RCL<NR0> Recall the setting data from the memory which previous
saved.
SAV<NR0> Saves the setting data to memory.
NR0:1=Memory1,2=Memory2,3=Memory3,4=Memory4;
ERR? Returns instrument error messages.
NR1
Response time
Example SAV1
1 – 4: Memory 1 to 4
Minimum 70ms
Stores the panel setting in
memory 1
HELP?
Description
Response time
Shows the command list.
Minimum 1000ms
43
ERR?
Description
Response time
Contents
44
Checks the error status of the instrument and
returns the last error message.
Minimum 70ms
See page38 for the list of error messages.
FAQ
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GPD-3303 Series User Manual
FAQ
Q1. I pressed the panel lock key but the output still turns on/off.
A1. The output key is not affected by the panel lock key operation,
for ensuring safety.
Q2. The CH3 overload indicator turned on – is this an error?
A2. No, it simply means that the CH3 output current reached the
maximum 3.0A and the operation mode turned from CV (constant
voltage) to CC (constant current). You can continue using the power
supply, although reducing the output load is recommended.
Q3. The specifications does not match the real accuracies.
A3. Make sure that the power supply is powered on for at least 30
minutes, within +20°C – +30°C.
Q4. The internal memory is not recording the panel setting correctly –
the output should be on.
A4. The output is always stored or recalled as “off” to ensure safety.
APPENDIX
23BFuse Replacement
Steps
1. Take off the power cord and remove the fuse
socket using a minus driver.
2. Replace the fuse in the holder.
For more information, contact your local dealer or GWInstek at
www.gwinstek.com.tw
/ marketing@goodwill.com.tw.
45
Rating
46
• 100V/120V:T6.3A/250V
• 220V/230V:T3.15A/250V
APPENDIX
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GPD-3303 Series User Manual
24BSpecifications
The specifications apply when the GPD-3303 series are powered on
for at least 30 minutes under +20°C – +30°C.
Output Ratings CH1/CH2
0 ~ 30V / 0 ~ 3A
Independent
CH1/CH2
0 ~ 60V / 0 ~ 3A
Series
CH1/CH2
0 ~ 30V / 0 ~ 6A
Parallel
CH3 2.5V/3.3V/5.0V, 3A
Vol tage
Regulation
Line
Load
≤ 0.01% + 3mV
≤ 0.01% + 3mV (rating current ≤ 3A)
≤ 0.02% + 5mV (rating current > 3A)
Recovery Time
Ripple & Noise
≤ 1mVrms (5Hz ~ 1MHz)
≤ 100μs (50% load change, minimum
load 0.5A)
Temperature
≤ 300ppm/°C
Coefficient
Current
Line
≤ 0.2% + 3mA
Regulation
Load
Ripple & Noise
CH3 Specification
Regulation
≤ 0.2% + 3mA
≤ 3mArms
Line ≤ 5mV
Load ≤ 15mV
Ripple & Noise
Tr ac kin g
Tracking Error ≤ 0.5%+10mV of Master (GPD-3303S)
Operation
Parallel
Regulation
≤ 2mVrms
≤ 0.5%+50mV of Master (GPD-3303D)
Line: ≤ 0.01% + 3mV
Load: ≤ 0.01% + 3mV
(rating current ≤ 3A)
Load: ≤ 0.02% + 5mV
(rating current > 3A)
Meter Resolution
Series
Regulation
Line: ≤ 0.01% + 5mV
Load: ≤ 300mV
GPD-3303D Voltage: 100mV
Current: 10mA
GPD-3303S Voltage: 1mV
Current: 1mA
A Meter GPD-3303D 3.2A full scale, 3 digits 0.5" LED
display
GPD-3303S 3.2A full scale, 4 digits 0.4" LED
display
V Meter GPD-3303D 32V full scale, 3 digits 0.5" LED display
GPD-3303S 32V full scale, 5 digits 0.4" LED display
Program
Accuracy
GPD-3303D ± (0.5% of reading + 2digits)
± (0.5% of reading + 2digits)
GPD-3303S ± (0.03% of reading + 10mV)
± (0.3% of reading + 10mA)
Readback
Accuracy
GPD-3303D ± (0.5% of reading + 2digits)
± (0.5% of reading + 2digits)
GPD-3303S ± (0.03% of reading + 10mV)
± (0.3% of reading + 10mA)
Insulation Chassis and
20MΩ or above (DC 500V)
Te rm in al
Chassis and
30MΩ or above (DC 500V)
AC cord
Operation
Environment
Indoor use, Altitude: ≤ 2000m
Ambient temperature 0 ~ 40°C
Relative humidity ≤ 80%
Installation category: II, Pollution degree: 2
Storage
Environment
Ambient temperature –10 ~ 70°C
Relative humidity ≤ 70%
Power Source AC 100V/120V/220V/230V±10%, 50/60Hz
Accessories User manual x1
Test lead GTL-104 x 2, GTL-105 x 1
(Europe) Test lead GTL-203 x 1, GTL-204 x 2
Dimensions 210 (W) x 130 (H) x 265 (D) mm
Weight Approx. 7kg
48BOptions
USB cable GTL-246 USB 2.0, A-B type
47
48
APPENDIX
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GPD-3303 Series User Manual
25BDeclaration of Conformity
We
GOOD WILL INSTRUMENT CO., LTD.
(1) No.7-1, Jhongsing Rd., Tucheng City, Taipei County, Taiwan
(2) No. 69, Lu San Road, Suzhou City (Xin Qu), Jiangsu Sheng, China
declare, that the below mentioned product
Type of Product: Power Supply
Model Number: GPD-3303D/GPD-3303S
are herewith confirmed to comply with the requirements set out in the
Council Directive on the Approximation of the Law of Member States
relating to Electromagnetic Compatibility (2004/108/EC, 89/336/EEC,
92/31/EEC, 93/68/EEC) and Low Voltage Directive (73/23/EEC,
93/68/EEC).
For the evaluation regarding the Electromagnetic Compatibility and
Low Voltage Directive, the following standards were applied:
◎ EMC
EN 61326-1: 2006 Electrical equipment for measurement, control and
laboratory use –– EMC requirements
Conducted Emission
Radiated Emission
EN 55011: 1998 + A1:1999 +
A2:2002
Current Harmonics
EN 61000-3-2: 2000 + A2:2005
Voltage Fluctuations
EN 61000-3-3: 1995 + A1:2001
------------------------- Conducted Susceptibility
------------------------- Power Frequency Magnetic Field
------------------------- Voltage Dip/ Interruption
◎ Safety
Low Voltage Equipment Directive 73/23/EEC, 93/68/EEC
Safety Requirements
IEC/EN 61010-1: 2001
ClassA
Electrostatic Discharge
EN 61000-4-2: 1995 + A1:1998 +
A2:2001
Radiated Immunity
EN 61000-4-3: 2002 + A1:2002
Electrical Fast Transients
EN 61000-4-4: 2004
Surge Immunity
EN 61000-4-5: 1995 + A1:2001
EN 61000-4-6: 1996 + A1:2001
EN 61000-4-8: 1993 + A1:2001
EN 61000-4-11: 2004
INDEX
automatic out off ..................21
banana plug...........................20
beep setting
contents..............................21
manual ...............................21
remote control...................42
caution symbol .......................5
cleaning the instrument.........7
COM setting, remote control
............................................36
command list ........................39
recalling the list.................43
common terminal, tracking
series...................................27
cooling fan.............................17
safety instruction ................6
CV/CC
CH1/CH2 indicator .........24
CH3 indicator....................26
operation theory .........10, 18
EN61010
declaration of conformity 49
measurement category ......6
pollution degree .................7
EN61326-1 .............................49
environment
operation..............................7
specification ......................48
storage..................................8
error messages, remote
control..........................38, 44
front panel
lock (manual).................... 22
overview ........................... 14
fuse
rating ................................. 46
replacing ........................... 46
safety instruction ............... 6
GPD series
block diagram................... 12
dynamic load.................... 10
lineup................................. 11
list of features ................... 11
operation theory............... 12
technology overview......... 9
ground symbol....................... 5
identification information... 43
load connection.................... 20
operation mode
independent...................... 23
remote control .................. 41
specifications .................... 47
tracking parallel ............... 32
tracking series................... 27
output current setting
manual............................... 24
remote control .................. 40
output on/off
FAQ ................................... 45
manual............................... 21
remote................................ 42
output voltage setting
manual............................... 24
remote control .................. 40
49
50
INDEX
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overload indicator ................26
power supply
safety instruction ................6
setup...................................19
socket overview ................17
specification.......................48
protective ground symbol.....5
rear panel overview .............17
recall settings
manual ...............................35
remote ................................43
remote control
command syntax ..............38
connection test ..................36
error messages ..................38
interface............................. 36
save settings
manual............................... 34
remote................................ 43
service operation
about disassembly ............. 6
contact ............................... 45
status, instrument ................ 42
tracking mode
operation theory................. 9
UK power cord....................... 8
USB interface ........................36
warning symbol ..................... 5
wire, load ..............................20
51
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