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DC Power Supply
GPD-2303S/3303S/4303S




Service MANUAL
GW INSTEK PART NO.




ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information which is protected by copyright. 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 Corporation.

The information in this manual was correct at the time of printing. However, Good Will continues to
improve its products and therefore reserves the right to change the specifications, equipment, and
maintenance procedures at any time without notice.

Windows is a registered trademark of Microsoft Corporation in the United States and other countries.


Good Will Instrument Co., Ltd.
No.7-1, Jhongsing Road., Tucheng Dist., New Taipei City 236, Taiwan .
Table of Contents



Table of Contents
Safety Instructions ..............................................6

How to Use This Manual ......................................9
Service Operation List ................................................................ 9
Summary of Chapters .............................................................. 10


GPD-x303S Series Overview .............................. 12
Front Panel ............................................................................. 13
Rear Panel .............................................................................. 13
Operation Theory .................................................................... 14
CV/CC Crossover Characteristics .............................................. 15
Specifications ......................................................................... 16
Options .................................................................................... 17



Preparing For Service Operations ....................... 18
Package Contents .................................................................... 18
Setting Up the Power Supply .................................................... 19
Powering up the power supply ................................................. 19
Connecting the load cables ...................................................... 19
Turning on the output .............................................................. 20
List of Equipments .................................................................. 21


Calibration ....................................................... 23
Preparing for Calibration ......................................................... 23
Calibration Log ....................................................................... 25
GPD-x303S(CH1/CH2) ............................................................. 25
GPD-4303S(CH3/CH4) ............................................................. 25
Calibrating CH1/2 Output Voltage/Current ............................... 27
Calibrating CH3/4 Output voltage/Current(4303S) .................... 33


Verification ...................................................... 37
Preparing for Verification ......................................................... 38
Verification Log ....................................................................... 39
Verifying High Voltage Insulation ............................................. 42
Verifying Output Voltage Accuracy ........................................... 43


3
GPD-3303 Series Service Manual

Verifying Output Current Accuracy ........................................... 46
Verifying CH3 Overload (3303S) ............................................... 48
Verifying Voltage Load Regulation ............................................ 49
Verifying Voltage Line Regulation ............................................. 54
Verifying Current Load Regulation ............................................ 55
Verifying Ripple Voltage .......................................................... 58


Updating the Firmware ...................................... 62
Preparing for Firmware Update ................................................. 62
Installing the USB Driver to the PC............................................ 63
Installing the bootloader software to the PC ............................ 64
Updating the Firmware ............................................................. 67



Replacing the Fuse ........................................... 69
Replacing the Primary Fuse ...................................................... 69
Replacing the Secondary Fuses ................................................. 70


Disassembling the Power Supply ........................ 72
Outer Casing & Supporting Bar ................................................. 72
Front Panel ............................................................................. 74
Power Supply PCB .................................................................... 76


GPD-x303S PCB & Circuit Diagram ..................... 77
Overview ................................................................................ 78
GPD-x303S Control PCB ........................................................... 79
GPD-x303S control PCB layout top side layout......................... 79
GPD-x303S control PCB layout bottom side layout .................. 80
GPD-x303S control PCB circuit diagram 1/4 ............................ 81
GPD-x303S control PCB circuit diagram 2/4 ............................ 82
GPD-x303S control PCB circuit diagram 3/4 ............................ 83
GPD-x303S control PCB circuit diagram 4/4 ............................ 84
GPD-x303S Display PCB ........................................................... 85
GPD-x303S display PCB Top side layout .................................. 85
GPD-x303S display PCB circuit diagram ................................... 86
GPD-x303S Power Supply PCB .................................................. 87
GPD-x303S power supply PCB layout (CH1/CH2/CH3) ............. 87
GPD-x303S power supply PCB circuit diagram
(CH1/CH2/CH3/CH4) ............................................................... 88
GPD-x303S Power Switch PCB, CH4 Power PCB, AC Selector PCB, USB
Interface PCB .......................................................................... 89

4
Table of Contents


Parts List ......................................................... 90
Outer Casing ........................................................................... 91
Internal Structures .................................................................. 93
Front Panel ............................................................................. 94
PCB Mount Parts: GPD-2303S ................................................... 95
PCB Mount Parts: GPD-3303S ................................................. 100
PCB Mount Parts: GPD-4303S ................................................. 107


Appendix ....................................................... 114
Declaration of Conformity ...................................................... 114
Index ................................................................................... 115




5
GPD-3303 Series Service Manual




SAFETY INSTRUCTIONS
This chapter contains important safety instructions that you
should follow when operating the instrument and when
keeping it in storage. Read the following before operating
this instrument to ensure your safety and to keep the
instrument in best condition.
Safety Symbols
These safety symbols may appear in this manual or on the instrument.

Warning: Identifies conditions or practices that could
WARNING result in injury or loss of life.

Caution: Identifies conditions or practices that could
CAUTION result in damage to the instrument or to other objects.

DANGER High Voltage


Attention: Refer to the Manual


Protective Conductor Terminal


Earth (ground) Terminal


Safety Guidelines

General guidelines Do not place any heavy object on the GPD-x303S series.
Avoid severe impacts or rough handling that leads to
CAUTION damaging the GPD-x303S series.
Do not discharge static electricity to the GPD-x303S
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-x303S series unless you are
qualified as service personnel.

(Continues to the next page)


6
Safety Instructions{



(Note) EN 61010-1:2001 specifies the measurement categories and their
requirements as follows. This instrument falls under category II.
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.

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

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.
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.

Cleaning the Disconnect the power cord before cleaning.
instrument
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.

Operating Location: Indoor, no direct sunlight, dust free, almost
environment non-conductive pollution (note below)
Relative Humidity: < 80%
Altitude: < 2000m
Temperature: 0C to 40C
(Note) EN 61010-1:2001 specifies the pollution degrees and their requirements as
follows. This instrument falls under degree 2.
Pollution is defined as "addition of foreign matter, solid, liquid, or gaseous
(ionized gases), that may produce a reduction in 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 can be expected.
Pollution degree 3: Conductive pollution occurs, or dry, non-conductive pollution
occurs which becomes conductive due to the expected condensation. In such
conditions, while the equipment is normally protected against exposure to direct
sunlight, precipitation, and strong draughts, neither temperature nor humidity is
controlled.



7
GPD-3303 Series Service Manual


Storage Location: Indoor
environment
Relative Humidity: < 70%
Temperature: -10C to 70C

Power cord for the United Kingdom
When using the instrument 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 mains leads may not correspond with the colour markings 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 or coloured Green or 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 0.75mm2 should be protected by a 3A 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.




8
How to Use This Manual{




HOW TO USE THIS
MANUAL
If you are not sure what type of service operation you
should choose, read the Service Operation List section and
find the chapter which suits your needs. The Summary of
Each Chapter section gives you an overview of this service
manual's contents.
To find a place in the manual which deals with a specific
keyword, refer to the Index chapter at the end of this service
manual.


Service Operation List
See the following list, decide which operation you might need, and jump to the
introduced chapter.

I want to... Go to... Page

Verify the The Verification chapter. We recommend you Page37
specifications to verify all listed items at once.

Calibrate the The Calibration chapter. To ensure accuracy, Page23
power supply calibrate all listed items at once. We also
recommend you to verify the specifications
afterward.

Update the The Firmware Update chapter. Page62
firmware

Replace the fuse The Fuse Replacement chapter. Page69

Examine the The PCB & Circuit Diagrams chapter. Page77
circuits

Order a part The Parts List chapter. Look up the parts list Page90
and find the part name, part number, and
quantity. For PCB mounted parts, look into
the PCB & Circuit Diagrams chapter too.



9
GPD-3303 Series Service Manual




Summary of Chapters
This document consists of the following chapters.

Safety Instructions Describes the important safety instructions that should be
(page6) followed before, during, and after operating the power
supply.

How to Use This Provides the summary of each chapter in this service
Manual (page9) manual and shows where to read for various service
operations.
List of service operations
Summary of chapters

GPD-x303S series Helps service engineers become familiar with the power
Overview supply. Panel overview and specifications contain all
(page12) performance data and functionalities. Operation theory
shows how the power supply is internally structured.
Front and Rear panel
Operation theory
CV/CC crossover characteristics
Specifications

Preparation Describes how to set up the power supply to prepare for
(page18) various service operations. Also lists all the required tools.
Package contents
Setting up the power supply
List of equipments for various service operations

Calibration Describes how to calibrate the power supply using its
(page23) automatic calibration function.

GPD-2303S/3303S/4303S:

CH1 output voltage CH1 output current
CH2 output voltage CH2 output current

GPD-4303S:

CH3 output voltage CH3 output current
CH4 output voltage CH4 output current




10
How to Use This Manual{


Verification Describes how to verify the power supply's major
(page37) functionalities, covering the following items:

High voltage insulation Output voltage accuracy
Output current accuracy CH3 overload
Voltage load regulation Voltage line regulation
Current load regulation Voltage ripple verification

Firmware upgrade Describes how to upgrade the firmware.
(page62)

Fuse replacement Describes how to replace the fuses.
(page69)
Main fuse (stored in the power cord socket)
Sub fuses (mounted on the power supply PCB)

Disassembly Shows how to remove major modules from the power
(page72) supply.

Outer casing and supporting bar
Front panel
Power supply PCB

GPD-x303S PCB & Shows the PCB layout diagrams and circuit diagrams.
Circuit diagrams
(page77) Control PCB Power switch PCB

Display PCB USB interface PCB
Power supply PCB CH4 Power PCB(for 4303S)
AC selector PCB

Parts List Shows the diagrams and replacement parts list for the
(page90) mechanical components used in the power supply.

Outer casing Internal structures
Front panel GPD-x303S PCB parts

Appendix Declaration of conformity
(page114)
Index




11
GPD-3303 Series Service Manual




GPD-X303S SERIES
OVERVIEW
The Overview chapter helps you become familiar with the
power supply. The front and rear panel diagrams introduce
how the panel items are called. The operation theory
describes the power supply's internal structure, and how
the signals are processed. The specifications section lists
technical details of the power supply series.


Front Panel ............................................................................. 13
Rear Panel .............................................................................. 13
Operation Theory .................................................................... 14
CV/CC Crossover Characteristics .............................................. 15
Specifications ......................................................................... 16
Options .................................................................................... 17




12
GPD-x303S Series Overview{




Front Panel
VoltMeter AmpMeter Memory key CH1(3) CH2(4)/Beep key

GPD-4303S DC Power Supply VOLTAGE
MEMORY Push
CH4 CH2 CH1 CH3 RECALL / SAVE
COARSE/FINE


1 CH1/3 FINE




V V 2 CH2/4
Voltage Knobs y
BEEP

PARA
3 /INDEP CURRENT
Push
COARSE/FINE
Parallel key
SER
4
A A
/INDEP FINE
Series key
LOCK OUTPUT Current
UNLOCK
Knobs
Output key
: Long Push

Lock key
0 5V , 1A 0 30V , 3A 0 30V , 3A 0 5V , 3A
SLAVE MASTER 5 10V , 1A


C.V. C.C. C.V. C.C. PAR. C.V. C.C. C.V. C.C.
POWER
CH4 CH2 GND CH1 CH3




SERIES OUTPUT COM +
PARA OUTPUT +




Power SW CH4 Output CH2 Output GND Terminal CH2 Output CH4 Output

CH4 CV/CC CH2 CV/CC/PAR CH1 CV/CC CH3 CV/CC
Indicator Indicator Indicator Indicator


Rear Panel
Power Cord /
USB Connector Cooling Fan Fuse Socket AC Selector




13
GPD-3303 Series Service Manual



Operation Theory
Overview The power supply consists of the following modules.
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 below block diagram shows the circuit arrangement.
The single phase input power is connected to the
transformer through the input circuit. Details of each part
are described after the block diagram.
For more details regarding the circuits, see page77



Block diagram AC Input Relay
Reference Auxiliary
(Example for CH2) Voltage Rectifier Control
Source & Filter Transformer




Current Main
Comparat "OR" Gate Amplifier
Rectifier
Compar
& Filter
ator


O/P
Voltage Voltage Series Instant
Amplifier Comparator Regulator Over Load
Protection




Auxiliary Rectifier The auxiliary rectifiers 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.



14
GPD-x303S Series Overview{


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 Q101, Q102, which then calibrates the output
voltage.

Overload When the unit is overloaded, Q107 activates to control the
current magnitude of Q101, to limit the output current. The
relay control circuit controls the power dissipation in the
series-wound regulated circuit.



CV/CC Crossover Characteristics
Background The GPD-x303S series automatically switches 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-x303S 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-x303S 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-x303S series goes
back to the Constant Voltage mode.

Diagram
Vout


Vmax
Constant
Voltage



Constant
Current

Iout
Imax



15
GPD-3303 Series Service Manual




Specifications
The following specifications apply when the power supply is powered on for at
least 30 minutes within +20C to +30C.
Output Ratings CH1/CH2 Indep. 0 to 30V / 0 to 3A
CH1/CH2 Series 0 to 60V / 0 to 3A
CH1/CH2 Parallel 0 to 30V / 0 to 6A
CH3 2.5V/3.3V/5.0V 0 ~ 3A(3303S)
0~5V,0~3A / 5.001~10V,0~1A(4303S)
CH4 0~5V,0~1A
Voltage Line 0.01% + 3mV
Regulation Load 0.01% + 3mV (rating current 3A)
0.02% + 5mV (rating current > 3A)
Ripple & Noise 1mVrms (5Hz ~ 1MHz)
Recovery Time 100s (50% load change, min load 0.5A)
Temp Coefficient 300ppm/C
Current Line 0.2% + 3mA
Regulation Load 0.2% + 3mA
Ripple & Noise 3mArms
Tracking Tracking Error 0.1% + 10mV of Master (0 to 30V)
Operation (No Load, with load add load regulation
100mV)
Parallel Regulation Line: 0.01% + 3mV
Load: 0.01% + 3mV (rating current 3A)
Load: 0.02% + 5mV (rating current > 3A)
Series Regulation Line: 0.01% + 5mV, Load: 100mV
Meter Resolution Voltage: 1mV (0 to 30V)
Current: 1mA (0 to 3A)
A Meter 3.2A full scale, 4 digits 0.4" LED display
V Meter 32V full scale, 5 digits 0.4" LED display
Program Accuracy (0.03% of reading + 10mV)
(0.3% of reading + 10mA)
Readback Accuracy (0.03% of reading + 10mV)
(0.3% of reading + 10mA)
CH3 of 3303S Output Voltage 2.5V/3.3V/5.0V 5%
Output Current 3A
Line Regulation 3mV
Load Regulation 5mV
Ripple & Noise 1mVrms (5Hz ~ 1MHz)
Insulation Chassis and Terminal 20M or above (DC 500V)
Chassis and Ground 30M or above (DC 500V)
Operating Indoor use, Altitude: 2000m
Environment Ambient temperature 0 ~ 40C
Relative humidity 80%
Storage Ambient temperature 10 ~ 70C
Environment Relative humidity 70%
Power Source AC 100V/120V/220V/230V10%, 50/60Hz
Accessories User manual x1
Test lead GTL-104A x 2
GTL-105A x 1(3303S); x 2(4303S)
(Europe) Test lead GTL-204 x 2
GTL-203 x 1 (3303S), x2(4303S)
Dimensions 210 (W) x 130 (H) x 265 (D) mm, Approx. 7kg



16
GPD-x303S Series Overview{


Options
USB cable GTL-246 USB 2.0, Type A-B




17
GPD-3303 Series Service Manual




PREPARING FOR SERVICE
OPERATIONS
The Preparation chapter describes the What (package
contents, required equipments) and How (setting up the
power supply) to prepare for various service operations.

Package Contents .................................................................... 18
Setting Up the Power Supply .................................................... 19
Powering up the power supply ................................................. 19
Connecting the load cables ...................................................... 19
Turning on the output .............................................................. 20
List of Equipments .................................................................. 21


Package Contents
The list below shows the components included in the purchased power supply.

Main unit GPD-2303S, GPD-3303S, or GPD-4303S

Cables GTL-104A x 2 (screw clip alligator clip, maximum 10A)
(non-European
GTL-105A x 1 (3303S), x2(4303S) (banana plug alligator
model)
clip, maximum 3A)
Power cord x 1

Cables (European GTL-201 x 1 (ground lead)
model)
GTL-203 x 1 (3303S), x2(4303S) (test lead, maximum 3A)
GTL-204 x 2 (test lead, maximum 10A)
Power cord x 1

Manual User manual x 1

PC interface The following items are not included in the package but are
additionally required when using the GPD-x303S's PC
interface functionalities.
USB cable x 1, Type A (host, PC) Type B (slave, power
supply)


18
Preparing For Service Operations{




Setting Up the Power Supply
Follow these instructions to properly set up the power supply. Refer to the user
manual for more details regarding other operations.

Powering up the power supply
1. Selecting the Before powering up the power
AC voltage supply, select the AC input voltage
from the rear panel.



2. Connecting Connect the AC power cord to the
the AC rear panel socket.
power cord



3. Powering up 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. To turn off the power, press
the Power switch again.
(for example:4303S)








Connecting the load cables
GTL-104A 1. Turn the terminal counterclockwise
and loosen the screw.
2. Insert the cable terminal.



3. Turn the terminal clockwise and
tighten the screw.




19
GPD-3303 Series Service Manual


GTL-105A Insert the plug into the socket.




GTL-201, 203, 204 Insert the plug into the terminal.




Wire type 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/cm2.

Wire size (AWG) Maximum current (A)

20 2.5

18 4

16 6

14 10

12 16


Turning on the output
Panel operation Pressing the Output key turns on all
outputs.

The key LED also turns on. Pressing the Output key again
turns off the output and the key LED.

Automatic output Any of the following actions automatically turns the output
off off, since they might suddenly change the output level in
harmful ways.

Change the operation mode between independent /
tracking series / tracking parallel
Recalling other setups from the memory
Storing the setup into the memory
Setting up the power supply is completed




20
Preparing For Service Operations{




List of Equipments
Here is the list of all equipments used in the service operations.

Item Requirements Used in

Digital multimeter DCV accuracy: (0.005%+0.0006) All verification
items except for
DCA accuracy: (0.1%)
insulation
Recommended model: Agilent-34401
Calibration

Multimeter power DCV: 100V
supply cable
DCA: 10A

DC electronic load DCV: 3 60V Load regulation,
line regulation,
DCA: 6mA 60A
ripple voltage
Power: 1 300W verification
Recommended model: PEL-300

Electronic load DCV: 100V
power supply cable
DCA: 10A

AC millivolt meter DCV: 0.3mV 60V Ripple voltage
verification
Frequency: 10Hz 1MHz
Recommended model: GVT-417B

Millivolt meter DCV: 100V
power supply cable
DCA: 10A

Hi-pot tester DC power: 0.1 5kV Insulation
verification
AC power: 0.1 5kV
Insulation resistance: 1 50M
Recommended model: GPI-735A

Hi-pot tester Standard accessory attached to the
power supply cable hi-pot tester

PC software Terminal application for GPIB Firmware upgrade
commands

PC Windows2000 or XP based PC Firmware upgrade




21
GPD-3303 Series Service Manual


USB cable TypeA (host, PC) TypeB (slave, Firmware upgrade
power supply)




22
Calibration{




CALIBRATION
The Calibration chapter describes how to calibrate the
power supply using its automatic calibration feature. We
recommend you to verify the specifications (page37) after
completing the calibrations.

Preparing for Calibration ......................................................... 23
Calibration Log ....................................................................... 25
GPD-x303S(CH1/CH2) ............................................................. 25
GPD-4303S(CH3/CH4) ............................................................. 25
Calibrating CH1/2 Output Voltage/Current ............................... 27
Calibrating CH3/4 Output voltage/Current(4303S) .................... 33


Preparing for Calibration
In order to ensure performance accuracy, we recommend
Note you to calibrate all items listed in this chapter at once.

Calibration item GPD-2303S/3303S/4303S:
CH1 output voltage CH1 output current
CH2 output voltage CH2 output current
PARA output current

GPD-4303S:
CH3 output voltage CH3 output current
CH4 output voltage CH4 output current

When to calibrate When using the power supply in a new environment
the power supply
After replacing one of the major internal modules, such
as the front panel or power supply PCB

Pre-calibration test To make the calibration more effective, we recommend you
to run the following test beforehand.
Burn-in test: 4 hours, 45~47C, RH 65%




23
GPD-3303 Series Service Manual


Calibration Location: Indoor, no direct sunlight, dust free
environment
Relative Humidity: < 80%
Temperature: +20C~+30C
Warm-up time: 30 minutes

Calibration Digital multimeter
equipments
Digital multimeter power supply cable
For detailed requirements for the equipments, see page21.




24
Calibration{




Calibration Log
Print out these pages and record the results. Keep it with the power supply.

Model GPD-2303S GPD-3303S GPD-4303S

Serial number ____________________

Date Year___________ Month__________ Date___________

Verified by Name____________________________
Company/Contact_________________________

Environment Temperature______C Humidity______%


GPD-x303S(CH1/CH2)
CH1 output voltage
Range DMM reading Acceptance range Pass/Fail
30V _____________V Pass Fail
0.3mV
0V _____________V Pass Fail

CH2 output voltage
Range DMM reading Acceptance range Pass/Fail
30V _____________V Pass Fail
0.3mV
0V _____________V Pass Fail

CH1 output current
Range DMM reading Acceptance range Pass/Fail
3.0A ____________A Pass Fail
0.5mA
0A ____________A Pass Fail

CH2 output current
Range DMM reading Acceptance range Pass/Fail
3.0A ____________A Pass Fail
0.5mA
0A ____________A Pass Fail

GPD-4303S(CH3/CH4)
CH3 output voltage
Range DMM reading Acceptance range Pass/Fail
10V _____________V Pass Fail
0.3mV
0V _____________V Pass Fail




25
GPD-3303 Series Service Manual

CH4 output voltage
Range DMM reading Acceptance range Pass/Fail
5V _____________V Pass Fail
0.3mV
0V _____________V Pass Fail

CH3 output current
Range DMM reading Acceptance range Pass/Fail
3.0A ____________A Pass Fail
0.5mA
0A ____________A Pass Fail

CH4 output current
Range DMM reading Acceptance range Pass/Fail
1.0A ____________A Pass Fail
0.5mA
0A ____________A Pass Fail




26
Calibration{



Calibrating CH1/2 Output
Voltage/Current
Accepted range GPD-x303S 0.3mV, 0.5mA

Equipment Multimeter
Multimeter Power supply cable

Connection
Digital Multimeter V


A




CH1


Configurations Power supply: N/A

Multimeter: DC voltage mode

Keypad Controls When calibrating, the keypad keys are used as number
keys (0 to 9). The keypad keys correspond to the following
numbers.
1 1 CH1 6
2 2 CH2
7
PARA
3 3 /INDEP 8
SER
4 4 /INDEP 9
LOCK 5 OUTPUT 0

Entering the 1. Press the power supply's front panel keys and knobs in
calibration mode the following order.
(MEMORY) 1 key PARA/INDEP key CH2 key
CURRENT knob (MEMORY) 4 key OUTPUT key
VOLTAGE knob




27
GPD-3303 Series Service Manual




(Do not turn the knob; press them)

2. The display enters into the calibration mode as in the
figure below (First into Burn in mode).

CH4 CH2 CH1 CH3




CA01 The default value is 00.000 (you can check the last default
Exit Burn in mode value by turning the VOLTAGE knob).

1. Input any digit from 1~9, press the
CURRENT knob to exit Burn in mode and
automatically go to the next step; (or turn
the CURRENT knob right to go the next
step, the same as below)
Input 0 (OUTPUT key), Press the
CURRENT knob to preserve Burn in mode
and automatically go to the next step;
2. Press the VOLTAGE knob twice to exit calibration
mode (same below)
CA02 CH4 CH2 CH1 CH3
Calibrating CH1
output voltage (0V)




1. Read the voltage value of CH1 with the DMM (Unit is
V). Record the 3 digits after the decimal point.




28
Calibration{


2. Input the DMM reading. For example for 0.065V, enter
digits "6" and"5". The system will automatically save
and go to the next step. (No need to input decimal
point. The same process is shown below)




CH1 LOCK


CA03 CH4 CH2 CH1 CH3

Calibrating CH1
output voltage
(30V)




1. Read the voltage value of the CH1 on the DMM (Unit is
V). Record the 3 digits after decimal point. For example
29.065V.

2. Input the reading of the DMM. For example,
29.065V.Enter digits "2", "9", "0", "6" and "5", the the
system will automatically save and enter to the next
step.

SER
2 /INDEP OUTPUT CH1 LOCK





Switching to CH2 Connect the multimeter cable to the CH2 output terminals.
output voltage
calibration

Connection
Digital Multimeter V


A




CH2




29
GPD-3303 Series Service Manual

CA04 CH4 CH2 CH1 CH3
Calibrating CH2
output voltage (0V)




1. Read the voltage value on CH2 with the DMM (Unit is
V).

2. Input the reading of the DMM and go to the next step.
CA05 CH4 CH2 CH1 CH3
Calibrating CH2
output voltage
(30V)



1. Read the voltage value on CH2 with the DMM
(Unit is V).

2. Input the reading of the DMM and enter to next step.

Switching to CH1 Connect the multimeter cable to the CH1 output terminals.
output current
calibration

Connection
Digital Multimeter V


A




CH1


CA06 CH4 CH2 CH1 CH3
Calibrating CH1
output current (0A)




1. Read the current value on CH1 with the DMM (Unit is
A).Record 3 digits after decimal point. For example
0.265A.




30
Calibration{


2. Input the DMM reading. For example, 0.265A. Enter
digits "2", "6"and"5". The the system will
automatically save and go to the next step. (No need to
input the decimal point. The same process is shown
below)
CA07 CH4 CH2 CH1 CH3
Calibrating CH1
output current (3A)




1. Read the current value on CH1 with the DMM (Unit is
A). For example, 2.965A.

2. Input the DMM reading. Enter digits "2", "9",
"6"and"5" and go to the next step.

Switching to CH2 Connect the multimeter cable to the CH2 output terminals.
output current
calibration


Digital Multimeter V


A




CH2


CA08 CH4 CH2 CH1 CH3
Calibrating CH2
output current (0A)




1. Read the current value on CH2 with the DMM (Unit is
A).

2. Input the DMM reading and enter the next step.




31
GPD-3303 Series Service Manual

CA09 CH4 CH2 CH1 CH3
Calibrating CH2
output current (3A)




1. Read the current value on CH2 port with the DMM
(Unit is A).

2. Input the DMM reading and go to the next step.

Switching to PARA Connect the multimeter cable to the CH1 output terminals.
output current
calibration

Connection
Digital Multimeter V


A




CH1


CA10 CH4 CH2 CH1 CH3
Calibrating PARA
output current
(100mA)



1. Read the current value on CH1 with the DMM (Unit is
A).

2. Input the DMM reading and go to the next step.
CA11 CH4 CH2 CH1 CH3
Calibrating PARA
output current
(1.5A)




1. Read the current value on CH1 with the DMM (Unit is
A).

2. Input the DMM reading and go to the next step.

Calibrating the CH1, CH2 output voltage/current is completed


32
Calibration{




Calibrating CH3/4 Output
voltage/Current(4303S)
Accepted range GPD-x303S 0.3mV,0.5mA

Equipment Multimeter
Multimeter Power supply cable

Switching to CH3 Connect the multimeter cable to the CH3 output terminals.
output voltage
calibration

Connection
Digital Multimeter V


A




CH3

CA12 CH4 CH2 CH1 CH3
Calibrating CH3
output voltage (0V)




1. Read the voltage value on CH3 with the DMM (Unit is
V).

2. Input the DMM reading and go to the next step.
CA13 CH4 CH2 CH1 CH3
Calibrating CH3
output voltage
(10V)




1. Read the voltage value on CH3 with the DMM (Unit is
V).

2. Input the DMM reading and go to the next step.




33
GPD-3303 Series Service Manual


Switching to CH4 Connect the multimeter cable to the CH4 output terminals.
output voltage
calibration

Connection
Digital Multimeter V


A




CH4


CA14 CH4 CH2 CH1 CH3
Calibrating CH4
output voltage (0V)




1. Read the voltage value on CH4 with the DMM (Unit is
V).

2. Input the DMM reading and go to the next step.
CA15 CH4 CH2 CH1 CH3
Calibrating CH4
output voltage (5V)




1. Read the voltage value on CH4 with the DMM (Unit is
V).

2. Input the reading on the DMM and go to the next step.

Switching to CH3 Connect the multimeter cable to the CH3 output terminals.
output current
calibration

Connection
Digital Multimeter V


A




CH3




34
Calibration{

CA016 CH4 CH2 CH1 CH3
Calibrating CH3
output current (0A)




1. Read the current value on CH3 with the DMM (Unit is
A).

2. Input the reading on the DMM and go to the next step.
CA17 CH4 CH2 CH1 CH3
Calibrating CH3
output current (3A)




1. Read the current value on CH3 with the DMM (Unit is
A).

2. Input the reading on the DMM and go to the next step.

Switching to CH4 Connect the multimeter cable to the CH4 output terminals.
output current
calibration

Connection
Digital Multimeter V


A




CH4

CA18 CH4 CH2 CH1 CH3
Calibrating CH4
output current (0A)




1. Read the current value on CH4 with the DMM (Unit is
A).

2. Input the reading on the DMM and go to the next step.



35
GPD-3303 Series Service Manual

CA19 CH4 CH2 CH1 CH3
Calibrating CH4
output current (1A)




1. Read the current value on CH4 with the DMM (Unit is
A).

2. Input the reading on the DMM and press the
VOLTAGE knob twice to exit the calibration mode.

Calibrating the CH3, CH4 output voltage/current is completed




36
Verification{




VERIFICATION
The Verification chapter describes how to make sure the
power supply is operating properly by verifying its major
functionalities. The verification is intended for a full
performance inspection before shipping the power supply
to the end user, after major component replacements, or a
firmware upgrade.

Preparing for Verification ......................................................... 38
Verification Log ....................................................................... 39
Verifying High Voltage Insulation ............................................. 42
Verifying Output Voltage Accuracy ........................................... 43
Verifying Output Current Accuracy ........................................... 46
Verifying CH3 Overload (3303S) ............................................... 48
Verifying Voltage Load Regulation ............................................ 49
Verifying Voltage Line Regulation ............................................. 54
Verifying Current Load Regulation ............................................ 55
Verifying Ripple Voltage .......................................................... 58




37
GPD-3303 Series Service Manual



Preparing for Verification
In order to ensure performance accuracy, we recommend
Note you to verify all items listed in this chapter at once.

When to verify the When using the power supply in a new environment
specification After replacing one of the major internal modules, such
as front panel or power supply PCB
After updating the firmware
When you need to make sure that the power supply is
malfunctioning or not

Pre-verification To make verification more effective, the following test is
test recommended before the verification.
Burn-in test: 4 hours, 45~47C, RH 65%

Verification Location: Indoor, no direct sunlight, dust free
Environment Relative Humidity: < 80%
Temperature: +20C~+30C
Warm-up time: 30 minutes

Verification Hi-pot tester with cable
equipments Digital multimeter with cable
Electronic load with cable
AC power supply with cable
For detailed requirements for the equipments, see page21.

When the For CH1/CH2 output voltage and current, calibrate the
power supply (page23).
verification fails...
For CH3/CH4 (4303S) output voltage and current,
calibrate the power supply (page33).
For other items, send the power supply back to the
factory for repair.




38
Verification{




Verification Log
Print out these pages and record the results. Keep it with the power supply.

Model GPD-2303S GPD-3303S GPD-4303S

Serial number ____________________

Date Year___________ Month__________ Date___________

Verified by Name____________________________

Company/Contact_________________________

Environment Temperature______C Humidity______%

Voltage insulation
Item Location Result Pass/Fail
Insulation CH1(+) GND _______ Pass Fail
resistance CH1(-) GND _______ Pass Fail
CH2(+) - GND