KG High Speed Electronic Load Series User manual

ELS-304
High SPEED
Elec tr onic Load
OPERATION MANUAL
Engineering Company
SERIES

Copyrights
According to relevant laws, all the copyright of this 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.
Trademarks
MicrosoftWindows, MicrosoftExcel,ActiveX, VisualBasic, and VisualC++ are
trademarks of its respective suppliers.

ELS-304
For your safety use of this Product I
For your safe use of this Product
This section describes the Handling Instructions when you use this Product in safety.
You are requested to understand and follow these instructions without fail.
It is not our responsibility for any accidents caused by the ignorance of the instructions or
improper handling or operation. .
Disassembly 
There are some portions inside where high Voltage may
present and which is dangerous to human. Please do NOT
remove the cover or panel of this Product.
Surroundings 
For the safety, do not use this product where explosive or
corrosive gas can be detected.
If you use this Product in the strong electromagnetic field,
because of the characteristics of this product, the noise induced
on the input cable may be also regarded as the signal and
measured to affect the measurement result. Do not use in such
surroundings.
Please do not palace this product where it will be subject to direct
sunlight or high temperature.
Please follow the instruction to use this product in the
temperature range between 23℃±5℃and the temperature of 
70% or less.
When any condensation is present, please do not use this product
until completely dried.
Please do not use this product in a dirty, duty, stuffy, slanting, or
vibrating locations. This product has a forced air-cooling
functions, so do not block the inlet and outlet by an obstacle and
keep the enough space around this product for the air-cooling.

ELS-304
IIFor your safety use of this product
Input Power 
DonotinputtheVolt.otherthanspecifiedforthisproduct.
(The input rated for this product is AC100V-240V 50/60Hz)
And Do not used the AC Power Cable that is attached to this
product.(Rated of the attached Power Cable in Japan is
AC100V）Use the proper cable that meets the Volt. and shapes in
t theareaorcountry.
Fuse
The fuse located in the AC inlet can be changed .
Use the proper Fuse with the same shape, rated, and the
characteristics. (The rated of this fuse is 250V/3.15A.)
Operator
It is suggested that the operator of this product should have
proper Engineering background in Electronics and understand
the descriptions in this manual before start using. If an operator
doesn’t have such background, the operator has to operate this
product under the supervision of the person who has such
background in Electronics.
Connections 
When you connect or disconnect this product with the other
GPIB instrument GPIB, please make sure that the power of
all the relevant instrument are turned off in advance.

ELS-304
For your safety use of this Product III
Move
Before you move this product, turn off the power , and remove all
the cables from this product.
When you move this product , attach this manual to the product,
and use the dedicated or more robust packing material.
Maintenance
Before you do maintenance or check this product, make sure
than the Power Plug is detached.
To keep the safety of this product, periodical maintenance and
check would be suggested.
We would also suggest the periodical calibration to keep the
performance of this product
Overload
Do not use the connector of this product for any purpose that is
not described in this manual.
Do not apply Volt. that exceeds the specifications.
Repair / Adjustment
TheAdjustment and Calibration can be done by Keisoku Giken.
Contacts or our distributor.

ELS-304
IVFor your safety use of this product
WARNING
CAUTION
Supplement
NOTE
Safety Symbols used in this Manual
To used this Product correctly and safely, the following symbols are used in this Manual and
this Product. Please review the following to understand the meaning of each symbol and us this
Product with cake about the safety.
This is a symbol label used both in this manual and on this 
Product, informing the portion or contents that you should
recognize as “Warning”, “Dangerous”, or “Caution”.
When you find this Label affixed on this Product, please refer
to the relevant portion in this manual to check the meaning.
Wrong or improper Operation may cause a considerable
disability including the death and heavy injury. Please
understand the description in this manual and follow the
relevant procedure and instructions.
WrongorimproperOperationmaydamagethisProductor
other connected Products and may cause a mild disability.
Please understand the description in this manual and follow
therelevantprocedureandinstructions.
This symbol shows the prohibited Matter.
This is Supplement for the Operations.
This is the Operating Suggestion about the Product
Performance.

ELS-304
Preface1
Preface
Index of this Manual
This Manual describes the following contents.
Chapter 1.Outline
The Outline and the Functions of this Product is described.
Chapter 2. Connections
The Connections and the Cautions when you connect are described.
Chapter 3. Name and Function of Each Part
The names and the functions of the Terminal Blocks and the Keys on the front Panel
are described.
Chapter 4. Operations
The names and the functions in Operation Panel, the I/O setting, and the
ConfigurationSettingisdescribed

Chapter 5. Operations for Load Modes
The Operations in each Load mode are described.
Chapter 6. Operations for Meas. Modes
The Operations in each Measurement mode are described.
Chapter 7. Alarms
The Protection Functions and the Alarm of this Product are described.
Chapter 8. Programming Mode
GPIB and UBS Commands are described
Chapter 9. Specifications
Electrical, Mechanical, and General Specifications of this Product are described.
Chapter 10.Maintenance / Calibration
The Maintenance, Check, and Calibration of this Product are described.

ELS-304
2Preface
Check Items when you unpack
When you unpack this Product, please check if there are any heavy damage on the
package during the Transportation and if there is any missing attachments.
If there are any missing attachments, please contact dealer or us promptly.
The attachments of this Product are as follows.
* Operation Manual（Ｍ-2099-02）*Input Power Cable (3P, 1.5m)

* CD-ROM *Cover for remote sense Terminal Block
(including the USB Driver) (This parts is attached to this Product.)
*Screws for load input terminal
（Two (2) pairs）

ELS-304
Preface3
CAUTION
CAUTION
Cautions when you move this Product
When you move this Product, take the grip to carry this Product.
・ When you move this Product, please turn off the Power of this Product
in advance.
・ When you transport this Product, use the same and dedicated Package
when you receive this Product. If you don’t have such package, use the
equivalent or better Package in any case.
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INDEX1
INDEX
For your safe use of this Product Ⅰ
Safety Symbols Ⅳ
Preface------------------------------------ 1
Index of this Manual------ 1
Check Items when you unpack------- 2
Cautions when you move--------------- 3
1.Outline---------------------------------------------------------------------------------- 1-1
1.1Outline 1-1
1.2 Features 1-1
1.3 Applications 1-1
1.4Options 1-2
2.Connections ---------------------------------------------------------------------------- 2-1
2.1 Power Cable 2-1
2.2 Load Terminal 2-2
2.3 CURRNET MONITER 2-5
2.4 TRIG OUT 2-7


3. Name and Function of Each Part ----------------------------------------------------- 3-1
3.1 Front Panel 3-1
3.2 Rear Panel 3-3
3.3SidePanel 3-4
4. Operations---------------------------------------------------------------------------- 4-1
4.1 Operation Panel 4-1
4.2 MenuSelection 4-2
4.3I/OSetting 4-3
4.4 Memory Functions 4-4

5. Operations for Load modes ----------------------------------------------------- 5-1
5.1 LoadMode 5-1
5.2 Load Settings 5-2
5.3 Response Time 5-4
5.4 Curr. Limit Setting 5-4
5.5 Constant Curr. (CC) Mode5-5
5.6 Constant Resistor (CR) Mode5-6
5.7 Constant Volt. (CV) Mode 5-7
5.8 Constant Power (CP) Mode 5-9
5.9 External Control (EXT) Mode 5-10
5.10 Short (SHORT) Mode 5-11
5.11 Dynamic (DYNAMIC) Mode 5-12

INDEX2
6.Operations for Meas. modes ---------------------------------------------------------- 6-1
6.1 Meas. Value Display 6-1
6.2 Sampling Rate 6-2
6.3 Volt. / Curr. Ranges 6-2
7.Alarms -------------------------------------------------------------------------------- 7-1
7.1 Over Current Limit 7-1
7.2 Over Voltage Alarm 7-1
7.3 Overheat Alarm 7-2
7.4 Reverse Connection Alarm 7-3
7.5 Over Power Alarm 7-4
7.6 Release an Alarm 7-4

8.Programming Mode ------------------------------------------------------------------- 8-1
8.1 GP-IB Interface 8-1
8.2 Meas. Commands 8-2
8.3 Load Setting Commands 8-3
8.4 System Commands 8-3
8.5 Multi Line Messages 8-4
8.6 Status Registers 8-4
8.7 GPIB Sample Program 8-5
8.8 USB Interface 8-8
8.9 ActiveX Controller Function References 8-14
8.10Usage of Active X from Excel8-16
8.11USB Sample Program 8-17

9.Specifications----------------------------------------------------------------------------- 9-1
9.1General 9-1
9.2 Meas. Section 9-1
9.3 Load Section 9-2
9.4 Output Section 9-3
9.5 OutlineView 9-3

10.Maintenance/Calibration -------------------------------------------------------------- 10-1
10.1 Cleaning 10-1
10.2 Fuse Exchange 10-1
10.3 Input Power Code 10-2
10.4 Calibration 10-2
10.5 Storage 10-2

ELS-304

ELS-304
Product outline1-1
1. Outline
1.1Outline
This product, ELS-304, has realized as fast as 200A/usec fast load response speed, slew
rate that any other products have never realized so far due to our unique new type of load
circuit. Ideal noiseless rising and falling waveforms that could not be achieved by any
prior art such as simple semiconductor switches have been realized in this ELS-304.
ELS-304 is a new generation high performance electronic load that can be used in
applications where very high-speed load response is necessary such as in evaluation of
characteristics of VRM/POL types of DC-DC converters.
1.2Features
・ Easy to connect, because the Load Terminal is located on the Front Panel.
・ Very fast load response up to 200Ａ/μs.(5V or more should be presented at the load
terminal)
・ Stable frequency response within 3dB up to 500KHz. (Ext. Control+ AC offset Volt)
・ No min. operating volt. Any volt difference drives the operation of this product.
・ Worldwide power input. (100V-240V50/60Hz)
・ Various load modes like CC, CR, CV, CP, Dynamic, Ext. control, Short are supported.
・ 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 of Over Volt., Over Power, Reverse Connection, and Over
Heat..
・ By internal Curr. Limit function, “ CV+Climit (Curr. Limit)” operation is supported.
・ Five (5) digits Current. And Voltage, measurement.
・ Up to 6 Meas./Setup Conditions Memory Function.
・ 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.
In fast load response of 200Ａ/μS, there are several cautions about the connection method
and load volt. To be noted.
For more information, Refer to →“ 2 Connections ”
Supplement

ELS-304
1-2Product outline
1.3Applications
There are some applications by using this Product including the following.
・ Test Low Volt. Power Supply for Micro Processor
・ Large-Current Fast Pulse Load Testing
・ Replace a Load Switch
・ Capacitor Evaluation Test
・ Evaluate a current sensor
・ Current. Sensor Evaluation Test
・ Relay Evaluation Test
・ Electronic double-layer Capacitor Evaluation Test
・ Fuel Cells I-V Characteristic Test
・ Fuel Cells I-V Characteristic Test
・ Power Semiconductor Evaluation Test
1.4Options
The following options are provide. Select them for your application.
Low inductance cable
LL-050（100A 50cm）
Ripple Noise converter
RC-02A (Factory option)
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.
Supplement

ELS-304
Connections2-1
2.Connections
This chapter describes some instructions about the connections to pull the full potential of this
product.
2.1Power Cable
For a customer in Japan, we attach a AC Power Cable for 1φAC100V with 3-prongplug.
Please be careful when you connect the cable because you may get an electric shock.
・ The Rated of the attached AC Power Cable with 3-prong plug is AC125V. If you
need to use a cable for more than AC125V, please prepare the proper AC
Cable.(This applies to a customer in Japan)
・ Before you connect or disconnect the AC Power Cable, the Power Switch of this
product should be OFF.
・ Connect the Power Plug to the 3P outlet including the GND terminal.
WARNING
WARNING

ELS-304
2-2Connections
2.2Load Terminal
(1) Remote Sense Cable
Never fail to connect a Remote Sense Cable that should be shielded or twisted. If the
Remote Sense cable is NOT used, Volt Meas. at the Load Terminal and Data in each
Load Modes (CR, CV, CP) using the Volt, Reference may have errors.
・ Before you connect this cable, turn off the power of the Target Device.
・ This product have the protection resistor to protect against the reverse
connection at the Load Terminals.
Because of this, the Volt. Meas. value may be lower due to the Volt. Drop of the
resistor. There is no such resistor at he Remote Sense Terminals.
TARGETDEVICE
+
-
SG
(1)
(2)
(3)
WARNING
NOTE

ELS-304
Connections2-3
(2) Load Cable
As shown in the Fig2-2-1, please use hexagon nuts and hexagon head bolts when you
connect load cables. Also please use load cables adapted for necessary current
capacity and wire the load cables as short as possible. In addition, twist the load
cables if the cable length is long and/or if possible.
Fig.2-2-1How to fix load cables to the load terminals of this product.
Load curr. Io（A）Size of the Wiring
Io≦10A 16AWG or more
10≦Io≦30A 12AWGor more
30≦Io≦60A 8AWG or more
60≦Io≦100A 7AWGor more
100≦Io≦120A 6AWG or more
Table 2-2-1Suggest Size of the Wiring for the Load Curr required

* Negative effect by inductance
Back electro motive force caused by both inductance of load cable and internal
inductance of this product would influence rising time. Needless to say, current could not
be sunk if the voltage drop caused by the back electro motive force exceeds volt between
load terminals, because there is no volt. Potential difference left.
This product is designed to minimize the internal inductance but is not zero, so it is
necessary that some level of voltage potential difference need to be presented between
the load terminals. For example, 2V needs to be presented between the load terminals to
set and realize 50A/usec slew rate. Again, Voltage drop is caused by the inductance of
load cables, it is suggested that the inductance caused by load cables should be minimize
as much as possible.
Volt between the Load
Terminals（V）Setting slew rate:α
5V≦Vin 200A/μs = α(Typ)
4V≦Vin 150A/μs = α(Typ)
3V≦Vin 100A/μs = α(Typ)
2V≦Vin 50A/μs = α(Typ)
Table2-2-2Correlation between the Volt at the Load Terminal and the typical Max. Slew Rate.
・ The Inductance of the option Cable (LL-050) is 80nH (Typ), almost one fifth of
general cable (equivalent to the 7AWG).
NOTE
FLANGE-NUTS(M8 Ni- plating)
Screw With Spring Washer
Flat Washer
(M8
×
20 W-Semusu Ni-plating)

ELS-304
2-4Connections
WARNING
WARNING
・ In case of reverse connection, this product alarms due to internal short condition.
But this product may be damaged if the current caused by the short exceeds
max. rated curr. (120A).
・ When you connect to a target device, never fail to power OFF the target device.
・ Do NOT apply any Volt other than the range (0-30V) any voltage outside this
range would damage this product.
(3) Ext. Control Cable
As for the cable between this product and use a shielded , twisted , or coaxial cable.
Both DC and AC can be inputted, but when you input AC, add the offset Volt. so that
the Volt should not be less than 0V always. The input of product should be in the
range between 0 and 10V, and DC and 500KHz (3dB).
・ Do NOT apply any Volt other than the range (0-10V) Any voltage outside this
range would damage this product.

ELS-304
Connections2-5
2.3CURRENT MONITER
This CURRENT MONITER can be used when you observe a current waveform by an
oscilloscope.
・ The CURRENT MONITER of this unit is NOT isolated. Please be careful when
you connect to an oscilloscope. Improper connections would cause damage.
・ Monitor output volt. : 10V/120A, Output impedance : 50Ω(typ.)
・ An equivalent circuit in terms of the current monitor of this product is shown.
NOTE
NOTE
+
-
X1
+
-
T2
T1
gate
Souce
Drain LO AD +
X2
MOSFET_Nch
Shunt R
R1
Power Suppl
y
5V
LO AD -
Ref_V
R2
+
-
X3+
-
T2
T1
R3
R4
R5
R6
I Monitor

ELS-304
2-6Connections
・Connection to an oscilloscope.
When you connect this product to an oscilloscope, please be careful about the polarities
of the probes of the oscilloscope to connect as shown in the Fig. 2-3-1.
Fig.2-3-1(Correct) Connections to an oscilloscope
・ If you should connect in reverse connection as shown in Fig. 2-3-1,large current
would flow through the probe and the internal of the oscilloscope causing a damage.
Fig.2-3-2(Wrong) Connections to an oscilloscope
NOTE
WARNING
ELS-304 Oscilloscope
Probe Ch1
Ch2
+
-
CUURNT MONITER
Load
Circuit
Moniter
Circuit
Load
Terminal
ELS-304
Current route
Ch1
Ch2
+
-
CUURNT MONITER
Load
Circuit
Moniter
Circuit
Probe
Load
Terminal
Oscilloscope