GW instek GPD-2303S, GPD-3303S, GPD-4303S service Manual

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

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

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

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

GPD-3303 Series Service Manual

WARNING

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

CAUTION

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

DANGER High Voltage

Attention: Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

General guidelines

CAUTION

 Do not place any heavy object on the GPD-x303S series.

 Avoid severe impacts or rough handling that leads to

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.

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.

Safety Guidelines

(Continues to the next page)

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

WARNING

 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.

Fuse

WARNING

 Fuse type: 100V/120V: T6.3A/250V, 220V/230V:

T3.15A/250V

 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 instrument

 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.

Operating environment

 Location: Indoor, no direct sunlight, dust free, almost

non-conductive pollution (note below)

 Relative Humidity: < 80%

 Altitude: < 2000m

 Temperature: 0°C to 40°C

(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.

GPD-3303 Series Service Manual

Storage environment

 Location: Indoor

 Relative Humidity: < 70%

 Temperature: −10°C to 70°C

Green/ Yellow:

Earth

Blue:

Neutral

Brown:

Live (Phase)

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:

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.

How to Use This Manual{

I want to…

Go to…

Page

Verify the specifications

The Verification chapter. We recommend you to verify all listed items at once.

Page37

Calibrate the power supply

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

Page23

Update the firmware

The Firmware Update chapter.

Page62

Replace the fuse

The Fuse Replacement chapter.

Page69

Examine the circuits

The PCB & Circuit Diagrams chapter.

Page77

Order a part

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

Page90

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.

GPD-3303 Series Service Manual

Safety Instructions (page6)

Describes the important safety instructions that should be followed before, during, and after operating the power supply.

How to Use This Manual (page9)

Provides the summary of each chapter in this service manual and shows where to read for various service operations.

 List of service operations

 Summary of chapters

GPD-x303S series Overview (page12)

Helps service engineers become familiar with the power supply. Panel overview and specifications contain all 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 (page18)

Describes how to set up the power supply to prepare for various service operations. Also lists all the required tools.

 Package contents

 Setting up the power supply

 List of equipments for various service operations

Calibration (page23)

Describes how to calibrate the power supply using its automatic calibration function.

GPD-2303S/3303S/4303S:

 CH1 output voltage

 CH2 output voltage

 CH1 output current

 CH2 output current

GPD-4303S:

 CH3 output voltage

 CH4 output voltage

 CH3 output current

 CH4 output current

Summary of Chapters

This document consists of the following chapters.

How to Use This Manual{

Verification (page37)

Describes how to verify the power supply’s major functionalities, covering the following items:

 High voltage insulation

 Output current accuracy

 Voltage load regulation

 Current load regulation

 Output voltage accuracy

 CH3 overload

 Voltage line regulation

 Voltage ripple verification

Firmware upgrade (page62)

Describes how to upgrade the firmware.

Fuse replacement (page69)

Describes how to replace the fuses.

 Main fuse (stored in the power cord socket)

 Sub fuses (mounted on the power supply PCB)

Disassembly (page72)

Shows how to remove major modules from the power supply.

 Outer casing and supporting bar

 Front panel

 Power supply PCB

GPD-x303S PCB & Circuit diagrams (page77)

Shows the PCB layout diagrams and circuit diagrams.

 Control PCB

 Display PCB

 Power supply PCB

 AC selector PCB

 Power switch PCB

 USB interface PCB

 CH4 Power PCB(for 4303S)

Parts List (page90)

Shows the diagrams and replacement parts list for the mechanical components used in the power supply.

 Outer casing

 Front panel

 Internal structures

 GPD-x303S PCB parts

Appendix (page114)

 Declaration of conformity

 Index

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

GPD-x303S Series Overview{

COARSE/FINE

FINE

COARSE/FINE

FINE

BEEP

UNLOCK

: Long Push

RECALL /

MEMORY

SAVE

VOLTAGE

Push

CURRENT

LOCK

CH1/3

CH2/4

OUTPUT

/INDEP

PARA

/INDEP

SER

DC Power Supply

CH4 CH1

GPD-4303S

CH2 CH3

C.V. C.C. PAR. C.V. C.C.

POWER

CH3

0 30V , 3A 0 30V , 3A

CH2 GND CH1

SLAVE MASTER

SERIES

OUTPUT COM

OUTPUT

PARA

CH4

C.C.C.V.C.C.C.V.

0 5V , 1A 0 5V , 3A

5 10V , 1A

+ +

USB Connector AC SelectorCooling Fan

Power Cord / Fuse Socket

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

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

Voltage Knobs y

Parallel key

Series key

Lock key

Output key

Current

Front Panel

Rear Panel

GPD-3303 Series Service Manual

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

(Example for CH2)

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.

Reference

Voltage Source

Auxiliary

Rectifier & Filter

AC Input

Transformer

Relay

Control

Current Comparat

“OR” Gate

Amplifier

Main

Rectifier Compar

& Filter

Voltage

Series

Instant

Protection

O/P

Amplifier Comparator Regulator Over Load

Operation Theory

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.

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

Vmax

Imax

Constant

Voltage

Constant

Current

Vout

Iout

CV/CC Crossover Characteristics

GPD-3303 Series Service Manual

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 Regulation

Line

≤ 0.01% + 3mV

Load

≤ 0.01% + 3mV (rating current ≤ 3A) ≤ 0.02% + 5mV (rating current > 3A)

Ripple & Noise

≤ 1mVrms (5Hz ~ 1MHz)

Recovery Time

≤ 100µs (50% load change, min load 0.5A)

Temp Coefficient

≤ 300ppm/°C

Current Regulation

Line

≤ 0.2% + 3mA

Load

≤ 0.2% + 3mA

Ripple & Noise

≤ 3mArms

Tracking Operation

Tracking Error

≤ 0.1% + 10mV of Master (0 to 30V)

(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

Line Regulation

≤ 3mV

Load Regulation

≤ 5mV

Ripple & Noise

≤ 1mVrms (5Hz ~ 1MHz)

Insulation

Chassis and Terminal

20MΩ or above (DC 500V)

Chassis and Ground

30MΩ or above (DC 500V)

Operating Environment

Indoor use, Altitude: ≤ 2000m Ambient temperature 0 ~ 40°C Relative humidity ≤ 80%

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-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

Specifications

The following specifications apply when the power supply is powered on for at least 30 minutes within +20°C to +30°C.

Options

USB cable

GTL-246

USB 2.0, Type A-B

GPD-x303S Series Overview{

GPD-3303 Series Service Manual

Main unit

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

Cables (non-European model)

 GTL-104A x 2 (screw clip – alligator clip, maximum 10A)

 GTL-105A x 1 (3303S), x2(4303S) (banana plug – alligator

clip, maximum 3A)

 Power cord x 1

Cables (European model)

 GTL-201 x 1 (ground lead)

 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)

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.

Preparing For Service Operations{

1. Selecting the AC voltage

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

2. Connecting the AC power cord

Connect the AC power cord to the rear panel socket.

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)



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.

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

Connecting the load cables

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)

2.5

18 4

16 6

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 off

Any of the following actions automatically turns the output 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

Turning on the output

Preparing For Service Operations{

Item

Requirements

Used in

Digital multimeter

 DCV accuracy: ± (0.005%+0.0006)

 DCA accuracy: ± (0.1%)

 Recommended model: Agilent-34401

All verification items except for insulation

Calibration

Multimeter – power supply cable

 DCV: ≥ 100V

 DCA: ≥ 10A

DC electronic load

 DCV: 3 – 60V

 DCA: 6mA – 60A

 Power: 1 – 300W

 Recommended model: PEL-300

Load regulation, line regulation, ripple voltage verification

Electronic load – power supply cable

 DCV: ≥ 100V

 DCA: ≥ 10A

AC millivolt meter

 DCV: 0.3mV – 60V

 Frequency: 10Hz – 1MHz

 Recommended model: GVT-417B

Ripple voltage verification

Millivolt meter – power supply cable

 DCV: ≥ 100V

 DCA: ≥ 10A

Hi-pot tester

 DC power: 0.1 – 5kV

 AC power: 0.1 – 5kV

 Insulation resistance: 1 – 50MΩ

 Recommended model: GPI-735A

Insulation verification

Hi-pot tester – power supply cable

 Standard accessory attached to the

hi-pot tester

PC software

 Terminal application for GPIB

commands

Firmware upgrade

 Windows2000 or XP based PC

Firmware upgrade

List of Equipments

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

GPD-3303 Series Service Manual

USB cable

 TypeA (host, PC) – TypeB (slave,

power supply)

Firmware upgrade

Calibration{

Note

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

Calibration item

GPD-2303S/3303S/4303S:

 CH1 output voltage

 CH2 output voltage

 CH1 output current

 CH2 output current

 PARA output current

GPD-4303S:

 CH3 output voltage

 CH4 output voltage

 CH3 output current

 CH4 output current

When to calibrate the power supply

 When using the power supply in a new environment

 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, 45~47°C, RH 65%

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

GPD-3303 Series Service Manual

Calibration environment

 Location: Indoor, no direct sunlight, dust free

 Relative Humidity: < 80%

 Temperature: +20°C~+30°C

 Warm-up time: ≥ 30 minutes

Calibration equipments

 Digital multimeter

 Digital multimeter – power supply cable

For detailed requirements for the equipments, see page21.

Calibration{

Model

GPD-2303S

GPD-3303S

GPD-4303S

Serial number

____________________

Date

Year___________

Month__________

Date___________

Verified by

Name____________________________

Company/Contact_________________________

Environment

Temperature______°C

Humidity______%

Range

DMM reading

Acceptance range

Pass/Fail

30V

_____________V

±0.3mV

Pass

Fail

_____________V

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

30V

_____________V

±0.3mV

Pass

Fail

_____________V

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

3.0A

____________A

±0.5mA

Pass

Fail

____________A

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

3.0A

____________A

±0.5mA

Pass

Fail

____________A

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

10V

_____________V

±0.3mV

Pass

Fail

_____________V

Pass

Fail

Calibration Log

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

GPD-x303S(CH1/CH2)

CH1 output voltage

CH2 output voltage

CH1 output current

CH2 output current

GPD-4303S(CH3/CH4)

CH3 output voltage

CH4 output voltage

Range

DMM reading

Acceptance range

Pass/Fail

_____________V

±0.3mV

Pass

Fail

_____________V

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

3.0A

____________A

±0.5mA

Pass

Fail

____________A

Pass

Fail

Range

DMM reading

Acceptance range

Pass/Fail

1.0A

____________A

±0.5mA

Pass

Fail

____________A

Pass

Fail

CH3 output current

CH4 output current

GPD-3303 Series Service Manual

Calibration{

Accepted range

GPD-x303S

±0.3mV, ±0.5mA

Equipment

 Multimeter

 Multimeter – Power supply cable

Connection

Digital Multimeter

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.



CH1



CH2



/INDEP

PARA



/INDEP

SER



LOCK



OUTPUT



Entering the calibration mode

1. Press the power supply’s front panel keys and knobs in

the following order. (MEMORY) 1 key → PARA/INDEP key → CH2 key → CURRENT knob → (MEMORY) 4 key → OUTPUT key → VOLTAGE knob

Calibrating CH1/2 Output Voltage/Current

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：

Exit Burn in mode

The default value is 00.000 (you can check the last default 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：

Calibrating CH1 output voltage (0V)

CH4 CH2 CH1 CH3

1. Read the voltage value of CH1 with the DMM (Unit is

V). Record the 3 digits after the decimal point.

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：

Calibrating CH1 output voltage (30V)

CH4 CH2 CH1 CH3

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.



/INDEP

SER



OUTPUT



CH1



LOCK



Switching to CH2 output voltage calibration

Connect the multimeter cable to the CH2 output terminals.

Connection

Digital Multimeter

CH2

GPD-3303 Series Service Manual

CA04：

Calibrating CH2 output voltage (0V)

CH4 CH2 CH1 CH3

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：

Calibrating CH2 output voltage (30V)

CH4 CH2 CH1 CH3

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 output current calibration

Connect the multimeter cable to the CH1 output terminals.

Connection

Digital Multimeter

CH1

CA06：

Calibrating CH1 output current (0A)

CH4 CH2 CH1 CH3

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

A).Record 3 digits after decimal point. For example

0.265A.

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