GW Instek GPP-2323 User manual

Programmable DC Power Supply
GPP-1326/GPP-2323/GPP-3323/GPP-4323
User Manual
ISO-9001 CERTIFIED MANUFACTURER

Copyright Statement
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 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 Dist., New Taipei City 236, Taiwan.

Table of Contents
3
Table of Contents
SAFETY INSTRUCTIONS .................................................. 6
Safety Symbols...........................................................6
Safety Guidelines ....................................................... 7
Power cord for the United Kingdom ......................... 10
OVERVIEW .................................................................... 11
Introduction............................................................. 12
Key Features ............................................................ 15
Front Panel .............................................................. 17
Rear Panel................................................................ 24
Constant Voltage/Constant Current Crossover
Characteristics ......................................................... 26
GETTING STARTED........................................................ 27
Start Up ................................................................... 28
Load Connection ...................................................... 29
Turning the Output On/Off ...................................... 31
BASIC OPERATION ........................................................ 32
Display Change ........................................................ 33
Source Function ....................................................... 36
Independent Output Mode ..................................... 41
Tracking Series and Tracking Parallel Modes......... 43
Load Function .......................................................... 46
Sequence Function ................................................... 50
Set Sequence Output............................................... 51
Set Group Parameter............................................... 53
Construct Templet................................................... 55
Menu Tree................................................................ 58
Save and Recall ........................................................ 60

GPP Series User Manual
4
Delay Function ......................................................... 63
Set Delay Output ..................................................... 63
Set Group Parameter............................................... 66
Menu Tree................................................................ 68
Save and Recall ........................................................ 71
Monitor Function ..................................................... 73
Set Monitor.............................................................. 74
Recorder Function.................................................... 76
Set Recorder............................................................. 77
Enternal I/O Control ................................................ 80
Key Function Description ........................................ 82
FILE OPERATION ........................................................... 84
Save/Recall .............................................................. 85
Restore Factory Default Settings .............................. 88
SYSTEM SETTINGS ........................................................ 89
System Information ................................................. 90
System Settings ....................................................... 91
Firmware Upgrading ................................................ 93
Description of Using Flash Drive ............................. 94
REMOTE CONTROL ....................................................... 96
Connection Usage .................................................... 98
RS-232 ...................................................................... 99
USB .......................................................................... 100
GPIB ......................................................................... 102
LAN .......................................................................... 103
Command Syntax ................................................... 109
Command List ....................................................... 113
Measurement Instructions...................................... 113
Display Functions .................................................... 113

Table of Contents
5
Output Commands ................................................. 113
Source and Load Commands.................................. 114
Status Commands ................................................... 119
System Commands ................................................. 120
System Related Commands .................................... 121
IEEE488.2 Common Commands ............................ 121
Command Details .................................................. 123
Measurement Commands ...................................... 123
Display Commands ................................................. 125
Output Commands ................................................. 127
Source and Load Commands............................... 131
Status Commands ................................................... 174
System Commands ................................................. 180
System Related Commands .................................... 189
SCPI Status Registers SCPI .................................... 190
Event Registers ........................................................ 192
Enable Registers ...................................................... 192
Status Byte Register................................................. 192
Standard Event Register .......................................... 194
Status Byte Register Commands............................. 195
Standard Event Register Commands ...................... 196
Other Status Register Commands .......................... 198
Errors..................................................................... 199
Error Message.......................................................... 199
Command Errors ..................................................... 199
APPENDIX ....................................................................203
Replacing the Fuse ................................................. 203
Specifications ........................................................ 204
Optional Accessories ............................................. 207
Declaration of Conformity ...................................... 208

GPP Series User Manual
6
SAFETY INSTRUCTIONS
This chapter contains important safety
instructions that you must follow during
operation and storage. Read the following before
any operation to insure your safety and to keep
the instrument in the best possible condition.
Safety Symbols
These symbols may appear in the manual or on the instrument.
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 GPP or to other
properties.
DANGER High Voltage
Attention Refer to the Manual
Protective Conductor Terminal
Earth (ground) Terminal
Do not dispose electronic equipment as
unsorted municipal waste. Please use a
separate collection facility or contact the
supplier from which this instrument was
purchased.

SAFETY INSTRUCTIONS
7
Safety Guidelines
General
Guideline
CAUTION
Do not place any heavy object on the unit.
Avoid severe impact or rough handling that
leads to damaging the unit.
Do not discharge static electricity to the unit.
Do not block the cooling fan opening.
Do not perform measurements on circuits that
are directly connected to mains power.
Do not disassemble the GPP unless you are
qualified.
(Measurement categories) EN 61010-1:2010
specifies the measurement categories and their
requirements as follows. The GPP 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.
Power Supply
WARNING
AC Input voltage range:
100V/120V/220V/230V ±10%
Frequency: 50Hz/60Hz
To avoid electrical shock connect the protective
grounding conductor of the AC power cord to
an earth ground.

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8
Fuse
WARNING
Fuse type: 100V/120V：T6.3A/250V，
220V/230V：T3.15A/250V
To prevent fire, replace the fuse only with the
specified type and rating.
Disconnect the power cord before replacing the
fuse.
Make sure the cause of fuse blowout is fixed
before replacing the fuse.
Cleaning the
power supply
Disconnect the power cord before cleaning the
oscilloscope.
Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid
into the oscilloscope.
Do not use chemicals containing harsh products
such as benzene, toluene, xylene, and acetone.
Operation
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

SAFETY INSTRUCTIONS
9
(Pollution Degree) EN 61010-1:2010 specifies
pollution degrees and their requirements as
follows. The GPP 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

GPP Series User Manual
10
Power cord for the United Kingdom
When using the power supply 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 coloured 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 either the letter E, the earth symbol
or coloured Green/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, a cable
of 0.75mm2should be protected by a 3A or 5A fuse. Larger
conductors would normally require 13A types, depending on the
connection method used.
Any exposed wiring from a cable, plug or connection that is
engaged in a live socket is extremely hazardous. If a cable or plug is
deemed hazardous, turn off the mains power and remove the cable,
any fuses and fuse assemblies. All hazardous wiring must be
immediately destroyed and replaced in accordance to the above
standard.

OVERVIEW
11
OVERVIEW
This chapter contains a brief introduction to GPP
series including the main features and an
overview of the front and rear panel. Use the
Getting Started chapter on page 27 to start up
instructions and how to setup the appropriate
operation environment.
Key Features ............................................................ 15
Front Panel .............................................................. 17
Rear Panel................................................................ 24
Constant Voltage/Constant Current Crossover
Characteristics ......................................................... 26

GPP Series User Manual
12
Introduction
Overview
The GPP series regulated DC power supply
series are light weight, adjustable,
multifunctional work stations. The GPP-1326
has a 1 independent adjustable voltage outputs
with sense.The GPP-2323 has a 2 independent
adjustable voltage outputs. The GPP-3323 three
independent outputs: two with adjustable
voltage levels and one with fixed level
selectable from 1.8V, 2.5V, 3.3V and 5V. The
GPP-4323 has four independent voltage
outputs that are all fully adjustable.
The GPP 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.
Independent /
Tracking Series /
Tracking Parallel
The three output modes of GPP 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 500V.
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.

OVERVIEW
13
Load Mode
The GPP series models have additional Load
function on both CH1 & CH2 with 3 modes:
CV (Constanct Voltage), CC (Constant Current)
and CR (Constant Resistance), all of which can
be selected through the function keys on the
front panel. Voltage, current and resistance can
be well regulated in each mode, respectively.
Constant Voltage/
Constant Current
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 page 26.
Automatic
tracking mode
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.

GPP Series User Manual
14
Display Change
Function
The GPP series provides up to 7 display types,
each of which can be well selected via setting.
For details, see page 32.
Output Waveform
Function
Under Source mode of the GPP series, user can
customize a certain V/I sequential waveform
output. Under Load mode, it is programmable
for dynamic load (below 1Hz). For details, see
page 50.
Remote Control
To meet the various needs of customers, the
GPP is designed for USB, GPIB and LAN
remote control. For details, see page 96.
Additional
Function
Control signal of external switch is reserved for
user. For details, see page 80.

OVERVIEW
15
Key Features
Features
Multiple Outputs:
GPP-1326：32V/6A x 1
GPP-2323：32V/3A x 2 (CH1/CH2)
GPP-3323：32V/3A x 2 (CH1/CH2)
1.8V/2.5V/3.3V/5V/5A x 1 (CH3)
USB Port Output：3A
GPP-4323：32V/3A x 2 (CH1/CH2)
5V/1A x 1 (CH3)，15V/1A x 1 (CH4)
Constant voltage and constant current operation
(CV/CC).
Low noise, thermostatically controlled fan.
Compact, lightweight, standard rack mount
comformity 3U, half Rack.
4.3 inch TFT display.

GPP Series User Manual
16
Operation
Digital panel control.
Output on/off control (ON/OFF), and each
channel can be controlled separately.
Digital voltage and current settings. (Key &
Encode)
10 groups of save/recall settings and 2 groups of
power-on settings.
10 groups of save/recall Sequence.
10 groups of save/recall Delay.
10 groups of save/recall Record.
CH1/CH2 workable in Load Mode
7 types display modes available with 5 contents
and 2 waveforms respectively
Input/Output terminal (Control I/O)
Alarm buzzer (BEEP).
Key lock function (LOCK).
Multiple remote control interfaces (standard:
RS232, USB; optional: GPIB, LAN)
Protection
Features
Overvoltage and overcurrent protection (OVP/
OCP)
Overtemperature protection (OTP).
Polarity Reverse Protection
Overload Protection (OPP in Load mode)
Interface
Remote Control RS-232 (standard)
USB remote control. (standard)
Control I/O (standard)
LAN remote control (optional)
GPIB & LAN remote control (optional)

OVERVIEW
17
Front Panel
LCD Number
pad Scroll wheel/ Arrow keys Function keys
USB host
Front panel
output terminals
Power button
*The panel above is the example of GPP-4323. For other models,
refer to page 23.
Display
Display
Interface
(Take GPP-4323 model as example)

GPP Series User Manual
18
Channel
distribution
Channel number and distribution vary by
models with different colors identifications:
CH1: Yellow CH2: Blue CH3: Pink CH4：
Green CH1 is master and CH2 becomes yellow
under tracking series and tracking parallel
modes.
Single channel
display
Channel/
Status
Power
display
V/I
setting
Voltage
display
Current
display
OVP/OCP
setting area
Channel no.
Color of channel remains the origanl when
not in the state of setting.
Color of channel blinks between the original and
orange when being set.
Channel status
Display active channel state
Power supply: CH1/CH2/CH3/CH4: green
or red
Load Mode: CH1/CH2: orange
Voltmeter
Indicators
Displays the output voltage with up to 6 digits
of resolution. The default units are Volts (V).

OVERVIEW
19
CH1：
CH2：
CH3：(GPP-4323)
(GPP-3323)
CH4：
Ammeter
Indicator
Displays the output current with up to 5 digits
of resolution. The default units are ampere (A).
CH1:
CH2：
CH3：(GPP-4323)
CH4：
Setting Display
Displays the voltage and current settings.
CH1/CH2/CH3/CH4:
CH3(GPP-3323) displays setting of voltage only
Display OVP/OCP settings
CH1/CH2/CH3/CH4:
The CH3 OVP of GPP-3323 is a fixed value
(approx. 5.5V), non-configurable and with only
on or off switch available for user. OCP is
available only for USB output port (approx.
3.1A)

GPP Series User Manual
20
Status
Indicator
Display the set function/remote control interface
: The active channel under setting status
: The status of OTP protection mode
: The status of USB flash drive connected
: USB remotely disconnected
: USB remotely connected
: The status of control I/O connected
Others: when operating in the series/parallel
tracking mode, the corresponding SER/PAR icons
appear on the display.
when Sequence/Delay/Monitor/Recorder is
activated, the corresponding SEQ/DLY/MON/
REC icons appear on the display.
Function Keys
Power Button
Turns the power on or off.
On:
Off:
Channel select
buttons
Each channel has its own
button and promptly
switchable among CH1-CH4
setting.
Output buttons
Individual
output
The ON/OFF button is
operational individually by
each channel. The Output key
will light up when the output is
on.
ON:
Output all
All ON: