KEISOKU GIKEN LOAD EDGE Series User manual

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Load Station Series
Quality Assurance Provision
This product passed our close product inspection. When it did not satisfy an early purpose,
specifications by trouble after the delivery in a year, we repair it gratis in the case of the
responsibility in our production. Please report to agency or us. We repair it in our factory. About
measurement precision, I guarantee it for six months after the delivery. But I will repair it
undermentioned for payment.
1. In the case of trouble / the damage that occurred by the handling against usage mentioned in
the manual of this product and instructions.
2. When you remodeled it without our approval
3. In the case of trouble / the damage that occurred because the handling was not reasonable
such as the bad transportation by the visitor, a fall at the time of the movement, a shock.
4. In the case of trouble / the damage by the natural accidents such as a fire / an earthquake /
the flood.
5. In the case of trouble / the damage that occurred by the abnormal input voltage.
6. When we dispatched an engineer.
*This warranty is valid only in Japan.
Copyrights
According to relevant laws, all the copyright of these manual contents belongs to KG(Keisoku
Giken Co., Ltd.). Any copy from this manual is prohibited without prior written permission by
KG.
Read this manual before start using this product
Please read this manual carefully before using this product.
This manual should be kept in a place accessible easily.
Please attach this manual to this product when you relocate them.
This manual is written based on the functions of this product when shipped from KG.
The specifications are subject to change without any notice.
Adaptation of Harmonic Control Rules
This product is for business porpose, so harmonic control rules do not include this one.
Trademarks
Microsoft Windows, Microsoft Excel, ActiveX, Visual Basic, and Visual C++ are trademarks of its
respective suppliers.

Load Edge Series
Safe Usage 3
For safety operation
This is an instruction for safety operation.
Please read the manual and follow all safety notes.
Please understand that we are not responsible for any accidents caused by wrong operation or
usage not following the safety note or cautions.
Prohibition of breakup
Never remove the cover or a panel since high voltage portion
exists inside that might cause injury to the body of operator.
Setting environment
For security reasons, do not use this product in the
environment where explosive and corrosive gasses exist.
Never use this product in where strong electric - magnetic
field because the heavy electric-magnetic field influences to
the unit.
Place this product on a flat surface and under no direct
sunshine. Also avoid to place where high humidity is
expected.
The operating environment condition of this product is
(Temperature : 23℃±5℃/ The humidity : Less than
70%RH).
Do not use this product when condensed dew. Don‟t use this
unit until it becomes completely dry.
Do not use this unit at dusty place or on a slope or place
where has much vibration.
Keep good distance from this unit to a wall.
Do not block air outlet of this product to have good air
circulation for cooling.

Load Edge Series
4Safe Usage
input power
Use at rated voltage only. (Input rating : AC 100 V～240 V
50/60 Hz )
In addition, use the power supply cable attached to this product.
(attached cable rating : AC 125 V)
When used abroad, use a power cable suitable for the shape and
rating for the power supply.
fuse
A replacement fuse is contained in the AC inlet.
Use the same shape and rating fuse only when necessary
(250V/3.15A)
operator
This product can be operated by only someone who is enogh
capable to understand this manual and after understanding all
contents of this manual.
An operator does not have enough knowledge must be
supervised by capable person.
Connections
In the case of connection or disconnection of GPIB unit, cut off
the power supplies of each product first.

Load Edge Series
Safe Usage 5
Transportation
Turn off all power switches and remove all wirings before
moving.
Always move the product with the instruction manual.
Use original packing materials when moving or for
transportation.
Use equivalent packing materials if original packing materials
are not available.
Maintenance and Inspection
Unplug the AC cable to prevent electrical shock before any
maintenance or inspection work.
It is suggested to periodical maintenance and inspection for
safety operation.
It is also suggested to calibrate periodically.
Over loading
Never use connectors or input terminals of this product other
than specified use.
Never apply voltage out of specification.
Repair and Adjustment
Please contact with us or your dealer for repair or adjustment.

Load Edge Series
6Safe Usage
Safety symbols
For safety operation, the following symbols are used in this manual.
Read and understand the meanings of each symbol for safety operation.
This symbol means Warning, Danger or Notice.
Refer to this manual of appropriate page when such symbol
was found on the product.
This symbol means severe human damage if not operated
this product properly.
Strictly follow the instruction in this manual.
This symbol means slight human damage when this product
is not used properly.
Follow the instruction of this manual properly.
This label means prohibited action.
This symbol shows the footnotes such as operational
procedure.
This symbol means that it is related to the performance of the
unit.
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Load Edge Series
Preface 7
Preface
General
Applicable models.
ELZ-175 30V-67.5A-175W
Framework of this manual
This manual consists of the following chapters.
Ch. 1: Product outline
Outline and features of this product are presented.
Ch. 2: Connections
Connections and their cautions are presented.
Ch. 3: Names and functions
Names and functions of for example, terminal and switch on the front panel are
presented.
Ch.4: Operations
Names and functions of operation panel, I/O setting, and memory functions are
presented.
Ch.5: Operations for Load modes
Operations in each load mode are presented.
Ch.6: Operations for meas. mode
Operations in each meas. mode are presented.
Ch.7: Alarm
Protection functions and alarms are presented.
Ch.8: Remote control
Commands of GPIB and USB are presented.
Ch.9: Parallel operation
Ch.10: Specifications
Electronic, mechanical, and general specifications are presented.
Ch.11: Maintenance and Calibration
Maintenance and calibration are presented.

Load Edge Series
8Preface
Check when you unpack
After you unpack, please check if the product suffers any damages and all the
accessories are duly provided.
Should you find any damages and missing accessories, please contact dealer you
purchased from or KG directly.
In the package of this product includes the following accessories.
□Operation manual（Ｍ-2163-02）□Input power cord（3P / ２m）
□3P-2Pplug □Remote sensing cover
(Attached to this product)
□CD-ROM □Screws for load input terminal
(USB Driver, etc.) （Two (2) pairs）
□Booster connection cable

Load Edge Series
Preface 9
Cautions when you transfer
When you carry this product, grasp the handle on the top surface shown below.
・Powers OFF this product before you carry this product.
・When you ship this product, use the original packaging materials that you
received from KG.
・If the package is not available, use an package that must have the same
protection capability of protecting this product against damages during
transportation
You must hold this handle when carrying it.
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Load Edge Series
10 TABLE OF CONTENTS
TABLE OF CONTENTS
For safety operation...........................................................................................................................3
Safety symbols...................................................................................................................................6
Preface...............................................................................................................................................7
General...........................................................................................................................................7
Framework of this manual.............................................................................................................7
Check when you unpack.................................................................................................................8
Cautions when you transfer ...........................................................................................................9
TABLE OF CONTENTS..................................................................................................................10
Chapter 1 Product Outline .............................................................................................................14
1.1 Outline .................................................................................................................................14
1.2 Features...............................................................................................................................14
1.3 Applications .........................................................................................................................15
1.4 Options.................................................................................................................................15
1.5 Extreme Power Technique（Patent pending）.................................................................16
Chapter 2 Connections ....................................................................................................................18
2.1 Power cable ..........................................................................................................................18
2.2 Cable Connections................................................................................................................19
2.3 To achieve fast load response ...............................................................................................23
2.4 CURRENT MONITOR.........................................................................................................25
2.5 TRIG OUT............................................................................................................................27
Chapter 3 Names and Functions.......................................................................................................28
3.1Front panel ..........................................................................................................................28
3.1.1 Display...........................................................................................................................29
3.2 Rear Panel ...........................................................................................................................31
3.3 Side panel.............................................................................................................................32
Chapter 4 Operations ......................................................................................................................33
4.1 Operation panel ...................................................................................................................33
4.2 Menu selection .....................................................................................................................34
4.3 LOAD CONTROL ................................................................................................................35

Load Edge Series
TABLE OF CONTENTS 11
4.4 I/O setting ............................................................................................................................38
4.5 Memory function ..................................................................................................................39
4.6 BIAS Unit.............................................................................................................................40
4.7 Current Monitor Range........................................................................................................42
Chapter 5 Operations for Load modes ............................................................................................43
5.1 Select Load mode..................................................................................................................44
5.2 Load setting .........................................................................................................................45
5.3 Response Rate......................................................................................................................47
5.4 Current limit setting ............................................................................................................48
5.5 CC mode...............................................................................................................................49
5.6 CR mode...............................................................................................................................50
5.7 CV mode...............................................................................................................................51
5.7.1 CV+Climit......................................................................................................................52
5.8 CP mode ...............................................................................................................................53
5.9 Load Control Changing by a value of voltage.......................................................................54
5.10 EXT mode...........................................................................................................................56
5.11 SHORT mode......................................................................................................................57
5.12 Dynamic Load mode (DYNAMIC) ......................................................................................58
5.13 Dynamic (Sequence) mode operation .................................................................................66
Chapter 6 Operations for meas. mode ............................................................................................71
6.1 Measurement value display .................................................................................................71
6.2 Sampling rate.......................................................................................................................72
6.3 Voltage / Current ranges ......................................................................................................72
Chapter 7 Alarms .............................................................................................................................75
7.1 Over current limit ................................................................................................................75
7.2 Over voltage alarm...............................................................................................................76
7.3 Overheat alarm ....................................................................................................................77
7.4 Reverse connection alarm ....................................................................................................78
7.5 Stop an alarm.......................................................................................................................79
7.6 Instant power limited status................................................................................................79
7.7 Release the power limited status .........................................................................................80

Load Edge Series
12 TABLE OF CONTENTS
Chapter 8 Remote control ...............................................................................................................81
8.1 GP-IB interface ....................................................................................................................81
8.2 Meas. commands..................................................................................................................82
8.3 Load setting commands .......................................................................................................83
8.4 System command .................................................................................................................84
8.5 Multi line message...............................................................................................................84
8.6 Status registers....................................................................................................................84
8.7 GPIB sample program .........................................................................................................85
8.8 USB interface.......................................................................................................................88
8.9 ActiveX controller function references .................................................................................94
8.10 ActiveX control from Excel.................................................................................................96
8.11 USB sample program .......................................................................................................97
chapter 9 Parallel operation ........................................................................................................98
9.1 Parallel operation...............................................................................................................98
9.1.1 Connection for Parallel operation..................................................................................98
9.1.2 Connection procedure in parallel operation.................................................................101
9.1.3 Master / Slave setting procedure .................................................................................101
9.1.4 Confirmation of connected units..................................................................................105
9.1.5 ALARM in parallel operation ......................................................................................105
9.1.6 Slew rate at parallel operation ....................................................................................106
9.1.7 Reset Parallel operation ..............................................................................................107
9.2 Multi-Channel Synchronized operation .............................................................................108
9.2.1 Connection for Multi-channel Synchronized operation ...............................................109
9.2.2 Connection procedure for multi-channel synchronized operation................................ 111
9.2.3 Multi-Channel Synchronization setting ...................................................................... 111
9.2.4 Confirm connection...................................................................................................... 115
9.2.5 Alarm in Multi-channel Synchronized operation......................................................... 115
9.2.6 Reset Multi-channel Synchronized operation.............................................................. 116
Chapter 10 Specifications.......................................................................................................... 117
10.1 General............................................................................................................................. 117
10.2 Measurement section .......................................................................................................117

Load Edge Series
TABLE OF CONTENTS 13
10.3 Load section......................................................................................................................118
10.4 Output section..................................................................................................................119
10.5 Outline view.....................................................................................................................120
10.6 Operating area .................................................................................................................121
Chapter 11 Maintenance.................................................................................................................122
11.1 Cleaning ...........................................................................................................................122
11.2 Fuse..................................................................................................................................122
11.3 Input power cable.............................................................................................................124
11.4 Calibration .......................................................................................................................124
11.5 Storage .............................................................................................................................124

Load Edge Series
14 Product Outline
Chapter 1 Product Outline
1.1 Outline
This product, ELZ-175, is a high-performance electronic load that can work in lower
voltage range and with fast load response due to internal new load circuits that KEISOKU
GIKEN developed. In addition, KEISOKU GIKEN‟s new “Extreme Power”technique
employed in this electronic load expands its applications because the “Extreme
Power ”technology allows peak load power operations that exceeds rated in short-term (*1)
and consecutive load power operations larger than rated power in middle-term (*1).
(*1: there are some limits upon such operations)
According to bias supply that is installed in ELZ-175, new various applications of this
electronic load include testing fuel cells, solar batteries in addition to testing conventional
switching power supplies.
1.2 Features
・Easily connectable design because load terminal is located on the front panel.
・Very fast load response up to 25Ａ/μs.(5V or more should be presented at the load
terminal)
・Larger power than rated can be set for a short-term operation by “Extreme Power”
technique. (up to 2000W)
・Stable frequency response within 3dB up to 300 kHz. (Ext. Control: AC+ offset Volt)
・There is no minimum voltage requirement thus ELZ-175 can operate from 0V.
・World-wide power input.(100V-240V 50/60Hz)
・Various load modes like CC, CR, CV, CP, Dynamic, ext. control and SHORT mode
・In the dynamic load mode, single and auto modes are supported.
・As the interface, both USB and GPIB are supported as the standard.
By simply connecting to your PC via a USB cable, you can control this product to
measure automatically.
Via GP-IB, you can easily integrate this product to your existent system.
・Abundant alarm functions including over voltage over power, reverse connection,
overheat.
・By internal function for current limitation, “CV+Climit(current limitation)”operation
is supported.
・By internal memory function, you can up to six (6) measurements and setting
conditions can be memorized.
・Ripple Noise digital measurement function (factory option)
Ripple noise can be measured by way of our unique method capable of measuring in
digital eradicating human reading error in using an analog.
For your setting fast load response, there are several cautions about the connection method
and load voltage and load current to be noted.
For more information, Refer to "Chapter 2 Connections"
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Load Edge Series
Product Outline 15
1.3 Applications
The following shows examples of the applications with this product.
・Test for low voltage power supplies for a micro processor.
・Large current fast pulse load test.
・Evaluate solar batteries
・Replace a load switch
・Evaluate the characteristics of battery‟s charge/discharge behavior
・Evaluate a capacitor
・Evaluate a current sensor
・Evaluate a relay
・Evaluate electronic double-layer capacitor.
・Evaluate the I-V characteristics of a fuel cell
・Measure AC impedance of a fuel cell
・Evaluate power semiconductor etc.
1.4 Options
The following options are provided.
Low inductance cable
Model
Length
Voltage
resistance
Ampacity
DC
resistance
Inductance
LL-050
50cm
500V
100A
1mΩ
80nH
LL-100
100cm
500V
60A
2mΩ
100nH
LL-200
200cm
500V
40A
4mΩ
130nH
** Values shown here are typical values
Ripple Noise converter
RC-02A (Factory option)
The LL-05, LL-100 and LL-200 are built to order. Ask us for availability.
The ripple & noise measurement module is a factory option only.
Please order when ordering electronic load.
The ripple noise converter is a factory option and you cannot purchase this RC-02A alone
and add this option by yourself. With this option, measurement of the ripple noise can be
controlled via GPIB and USB.
Contact a dealer you purchased from or KG directly for any questions.
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Load Edge Series
16 Product Outline
1.5 Extreme Power Technique󲥵Patent pending󲥶
Principal of “Extreme Power”
In conventional electronic loads, it is impossible the instant power calculated as the
product of applied voltage and load current exceed the rated power even in a short period.
This limitation results in that it is necessary to secure an additional electronic load unit
that can work in higher power capacity. KEISOKU GIKEN‟s “Extreme Power”technique
will remove the strict limit and provide wider operating range by making the best of
improved the latest device protection technology.
In most cases, it may be only about 2 to 20 seconds that needs for maximum load current in
general tests including the load regulation test and over current test of a switching power
supply.
Even in those cases, when an average power is calculated by integrated for all the period of
the whole tests, the average power is substantially lower than rated power because in the
whole tests, there are several load conditions including max load, light load and even no
load conditions. KEISOKU GIKEN paid attention to this actual procedure of testing and
developed the “Extreme Power”technique which allows a consecutive operation with much
larger load current than rated as long as the averaged power does not predetermined limit.
In addition, even when high power operation exceeding the allowance time, the electronic
load unit has robust protection circuits to protect the unit. The operations of the
protection circuits can be monitored to check if the load operation exceeds the limit or not.
Relationship between Maximum load and Load ON time
The averaged power should be calculated according to the following formula.
Pav: Rated power
Pm: Averaged power
Pw: Peak power
a[W]: Base power
T: whole period
t: Period of Peak power
The limits of applied peak power are as follows:
< 20uS
< 20sec
Rated power
2000W
215W
175W

Load Edge Series
Product Outline 17
Examples
When a pulse load of 1KW and 100μs width repeats in period of 500μs, the averaged
power will be
1KW ×(100μs ÷500μs ) = 200W
So it is possible to apply this load conditions for up to 20 seconds.
When a pulse load of 200W and 20s width followed by 3s or longer pause, the averaged
power will be
200W ×(20s ÷(20s + 3s) ) ≒174W
The calculated average power will be less than 175W.
So it is possible to operate consecutively.

Load Edge Series
18 Connections
Chapter 2 Connections
Necessary cautions for connections
2.1 Power cable
In domestic shipment, we attach a 3-pin AC100V AC cable.
Please be careful when you connect power cable because you may get electric shock.
・The rating of above 3-pin AC100V AC cable is AC 125V. Please use an AC cable
adapted to the input voltage
・Power OFF this product first, before you connect / disconnect an AC cable.
・Use an AC cable that has 3pin type having a GND terminal.
・When you used a 3P-2P plug, connect the guard line to a GND line.
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Load Edge Series
Connections 19
2.2 Cable Connections
Fig. 2-2-1: How to connect cables
TARGET DEVICE: e.g. Power supply to be tested, Device under test.
SG: Signal Generator (e.g. standard voltage source, oscillator)
When a BIAS supply turns on , inverse voltage of 0.66 V is generated between end
terminals of a load.
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Load Edge Series
20 Connections
(1) Remote sense cable
Be sure to connect remote sensing cables
It is necessary to connect remote sensing cables properly when in EXT sensing mode
(you can select EXTernal sensing or INTernal sensing by switching a button in rear
panel of main unit). Use such as shielded cable or twisted cables. Pay great attention on
its polarity.
If a remote sense cable is not used (opened), it would cause an error in voltage
measurement at load terminal and measurement in CR, CV, CP modes requiring
reference voltage.
・Powers OFF a TARGET DEVICE first before you connect cable to the TARGET
DEVICE. In a case of using remote-sensing cable, you must switch a selecting
button (it‟s in rear panel in main unit) to EXTernal sensing. When you don‟t use
remote-sensing cable, you have better to select INTernal sensing. If you don‟t
have a properly setting, you can‟t measure a correct value and you are also
trouble in load setting and power protection.
This product has a protection resister against a reverse connection between remote sense and
load terminals. So as for the voltage, measurement at the load terminal, measured value may
be lower than actual value due to the protection resister. There is no protection resister at the
remote sense terminals.
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