EKO MP-11 User manual

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
Pg. 1
1. Index
1. Index 1
2. Important User Information 2
2-1. Contact Information 2
2-2. Warranty and Liability 2
2-3. About Instruction Manual 3
2-4. Environment 3
2-5. CE Declaration 4
3. Safety Information 5
3-1. WARNING/CAUTION 5
3-2. HIGH VOLTAGE WARNING 6
4. Introduction 7
4-1. Main Functions 8
4-2. Package Contents 10
5. Getting Started 12
5-1. Parts Name and Descriptions 12
5-2. System Configuration 16
5-3. Setting 17
6. MP-11 Applications 20
6-1. Case-by-Case Applications for MP-11 20
7. I-V Curve shape and possible cause 34
7-1. I-V curve shape and possible cause 34
8. MP-11 Operation 36
8-1. MP-11 Key Operation 36
8-2. Starting MP-11 37
8-3. Main Menu & Monitoring Screen 38
8-4. Setting Menu 40
8-5. Measuring 46
8-6. Data Display Menu 47
9. Software 51
9-1. Software Installation and Uninstallation 51
9-2. USB Driver Installation 56
9-3. Software Operations 60
9-4. Save Data Format 77
10.Maintenance & Troubleshooting 80
10-1. Maintenance 80
10-2. Error & Warning Messages 81
10-3. Troubleshooting 85
11.Specification 87
11-1. Specification 87
11-2. Software 91
11-3. Option 93
11-4. Dimensions 94

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
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2. Important User Information
Thank you for using EKO Products
Make sure to read this instruction manual thoroughly and to understand the contents before starting to operate the
instrument. Keep this manual at safe and handy place for whenever it is needed.
For any questions, please contact us at one of the EKO offices given below:
2-1. Contact Information
EKO INSTRUMENTS CO., LTD.
Asia, Oceania Region
www.eko.co.jp
[email protected]
EKO INSTRUMETNS Co., Ltd.
1-21-8 Hatagaya, Shibuya-ku
Tokyo, 151-0072 Japan
Tel: [phone]
Fax: [phone]
Europe, Middle East, Africa, South America Region
www.eko-eu.com
[email protected]
EKO INSTRUMENTS Europe B.V.
Lulofsstraat 55, Unit 32,
2521 AL, Den Haag, The Netherlands
Tel: [phone]
Fax: [phone]
North America Region
www.eko-usa.com
[email protected]
EKO INSTRUMENTS USA Inc.
95 South Market Street, Suite 300
San Jose, CA 95113 USA
Tel: [phone]
Fax: [phone]
2-2. Warranty and Liability
For warranty terms and conditions, contact EKO or your distributor for further details.
EKO guarantees that the product delivered to customer has been verified, checked and tested to ensure that
the product meets the appropriate specifications. The product warranty is valid only if the product has been
installed and used according to the directives provided in this instruction manual.
In case of any manufacturing defect, the product will be repaired or replaced under warranty. However, the
warranty does not apply if:
Any modification or repair was done by any person or organization other than EKO service
personnel.
The damage or defect is caused by not respecting the instructions of use as given on the product the
instruction manual.

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2-3. About Instruction Manual
Copy Rights Reserved by EKO INSTRUMENTS CO., LTD. Making copies of whole or parts of this
document without permission from EKO is prohibited.
This manual was issued: 2016/09/26
Version Number: 7
2-4. Environment
1. WEEE Directive 2002/96/EC
(Waste Electrical and Electronic Equipment)
This product is not subjected to WEEE Directive 2002/96/EC however it should not be mixed with general
household waste. For proper treatment, recovery and recycling, please take this product(s) to designated
collection points.
Disposing of this product correctly will help save valuable resources and prevent any potential negative
effects on human health and the environment, which could otherwise arise from inappropriate waste
handling.
2. RoHS Directive 2002/95/EC
EKO Instruments has completed a comprehensive evaluation of its product range to ensure compliance with
RoHS Directive 2002/95/EC regarding maximum concentration values for substances. As a result all products
are manufactured using raw materials that do not contain any of the restricted substances referred to in the
RoHS Directive 2002/95/EC at concentration levels in excess of those permitted under the RoHS Directive
2002/95/EC, or up to levels allowed in excess of these concentrations by the Annex to the RoHS Directive
2002/95/EC.

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
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2-5. CE Declaration
DECLARATION OF CONFORMITY
We: EKO INSTRUMENTS CO., LTD
1-21-8 Hatagaya Shibuya-ku,
Tokyo 151-0072 JAPAN
Declare under our sole responsibility that the product:
Product Name: I-V Curve Checker
Model No.: MP-11
To which this declaration relates is in conformity with the following harmonized
standards of other normative documents:
Harmonized standards:
EN 61326-1:2006 Class A (Emission)
EN 61326-1:2006 (Immunity)
EN 61000-4-2 EN 61000-4-3
EN 61000-4-4 EN 61000-4-5
EN 61000-4-6 EN 61000-4-8
EN 61000-4-11
Following the provisions of the directive:
EMC-directive : 2004/108/EC
Low Voltage Directive : 2006/95/EC
Date: May 28, 2014
Position of Authorized Signatory: Deputy General Manager of Quality Assurance Dept.
Name of Authorized Signatory: Shuji Yoshida
Signature of Authorized Signatory:

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
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3. Safety Information
EKO Products are designed and manufactured with consideration for safety; however, please make
sure to read and understand this instruction manual thoroughly to be able to operate the instrument
safely in the correct manner.
WARNING
CAUTION
Attention to user; pay attention to the instructions given on the
instruction manual with this sign.
HIGH
VOLTAGE
WARNING
High voltage is used; pay special attention to instructions given on
this instruction manual with this sign to prevent electric leakage
and/or electric shocks.
3-1. WARNING/CAUTION
1. Handling
DO NOT use MP-11 for other than its original purpose.
DO NOT disassemble, modify or touch inside of MP-11.
Check the main supply voltage corresponding to the voltage requirements of the MP-11 power
adapter.
Use ONLY the AC/DC adapter, which is assigned to the MP-11. Using other types of power
adapters will cause potential risk for damage. EKO will NOT take responsibilities in case of
damage or accidents occurrence with use of cables other than attached to MP-11. Data taken with
other cables will NOT be assured.
Make sure that the connection terminals and cables used for connecting PV
modules/strings/arrays satisfy their rating capacity
Connect probes securely so that they will not easily come off from the terminals.
DO NOT connect to PV strings/arrays, which exceed the rated maximum voltage 1000V, current
30A, and power 18kW.
To avoid the risk of damage, switch ON the MP-11 power first, before connecting the PV
module/array to be measured, and disconnect the PV module/array before turning OFF the MP-11.
Disconnect power conditioner or inverter, before connecting MP-11 to PV module/string/array.
Switch ON MP-11 before connecting to PV module/string/array
Disconnect PV module/string/array before Switch Off MP-11
If you notice any smoke or odor from MP-11, turn OFF the power immediately.

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2. Operating Environment
DO NOT expose the MP-11 to strong mechanical vibrations and/or impact, high humidity and water,
dust, extreme temperature differences, and near objects that generate strong magnetic and/or
electric fields to prevent possible damage to the MP-11 or potential risk to the operator.
When using MP-11 at the outdoor field, make sure to connect the grounding wire to the grounding
terminal.
MP-11 can’t be used in rainy weather. DO NOT use when it may rain.
Do not expose the main unit to excessive heat sources (long term exposure to sun light), as the
electronics might become overheated and will switch off.
3-2. HIGH VOLTAGE WARNING
1. Power Supply
When using MP-11 on outdoor field, always use/wear isolating safety items (conductive rubber
gloves, boots, etc.) for protection from electric shocks during operation.
Be aware of any potential risks for electric shock. When connecting electric cables to and
disconnecting from the PV module/array, wear high-voltage rubber insulating gloves and boots as
hazardous voltages may cause electric shock.
When connecting to and disconnecting from the PV module/array, always check for any risks for
electric shock by testing the connecting area with tester, etc. before connecting or disconnecting.
Do not touch the terminal block and power source plugs with wet hands. This may cause electric
shocks and/or electric leakages.
For safety reasons the PV power system and MP-11 should be operated by authorized electric
engineers only.
Disconnect power conditioner or inverter before measurements.
Always switch On MP-11 before connecting to PV module/ string/array
Securely connect proves to PV module/string/array before measurements.
Always disconnect PV module/string/array before switching Off MP-11.

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4. Introduction
The robust portable battery operated MP-11 I-V Checker enables the operator to perform accurate I-V performance
measurements and inspection of PV modules or arrays on site. For direct control of the measurement functions
and analyzing measurement results, the Main Unit has a key-pad and Graphical LCD display. The MP-11 offers an
all in one measurement solution to make PV module testing very easy, hence all required accessories like the
radiation sensor, temperature sensors, cables and PC software for control and extended data analysis are
included.
The MP-11 I-V Checker is capable to measure I-V curves based on the parameters (Vpm, Ipm, Pmax, Voc, Isc, FF,
Tmod, ηeff) of any PV module types and arrays, also called strings. It is highly suitable during PV module
installation, for making routine checks for inspection of energy yield, tracing module performance and potential
defects and general maintenance checks. The MP-11 can be used for almost any Module type as long as the
output fits in the range (10 –1000V / 100mA - 30A / 10W - 18 kW).
*) See Applicable PV module/Array in 11. Specification
The MP-11 measuring principle is based on the capacitive electronic load method, which makes it a compact
measurement device with a wide measuring range (Voltage, Current and Power). With traditional I-V curve tracers,
sensors had to be at the place where the PV module is situated, which consequently requires long cables between
the PV module and I-V curve tracer. By using the remote Sensor unit installed near the PV module accurate
measurements can be performed and data can be stored on board. The MP-11 is unique due to the integrated
removable Sensor Unit. The Sensor Unit contains an integrated high precision pyranometer, which is based on a Si
Photodiode and data logger to store the measured data of the internal or external sensor and 2 temperature
sensors. It is used to measure the solar irradiance in simultaneously with the PV module, PV module back surface
temperature and ambient temperature. The input terminals for external sensors are available on the Sensor Unit to
connect any EKO pyranometer type, such as MS-802 (ISO Secondary standard), MS-402/MS-410 (ISO First
Class), MS-602 (ISO Second Class), ML-01 (Silicon type) or reference cell as sometimes required by directive or
spectral match with the modules installed. With the built in data logger, the measurement data can be recorded for
maximum of one day. After the test, the data can be easily transferred from the Sensor Unit to the Main Unit by
connecting it through the sensor unit cable.
The Main Unit is capable of measuring, displaying and analyzing data, all functions that can be accessed through
the front panel keypad. Up to 300 I-V curves can be stored on board, which is mostly sufficient for one day. On top
of that extensive data analysis and data storage, data format conversion to a (.CSV) file format can be done using
the PC with the MP-11 control software. The I-V curve measurement data displayed on the Main Unit are
automatically converted into STC values, known as Standard Test Conditions (STC) values complying to the IEC
60891 and JIS C8914/8919/8940 Standard. This way measurement values converted to STC values can be better
quantitatively compared when the data are obtained during different environmental or atmospheric conditions
(Global radiation, Temperature) or inter compared between different types of modules.
For the ease of use, most common physical constants like Alpha, Beta, Kappa and Rs are pre-set and can be
selected to make the STC conversion. For more specific module types those parameters and other module
settings can be customized and stored as a personal file.

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More specific information about the measurement system set up, operating the MP-11, PC software and technical
specifications are written in the each chapter or section of this manual.
4-1. Main Functions
1. Portable
MP-11 housing was designed with “portable” all-in one concept in mind, emphasizing the user-friendliness
and safety at the operation site. The instrument housing is made of electrically insulated resin for safety
purposes. The portable single case I-V tracer offers a space to accommodate the Sensor Unit, cables, and
connectors.
2. Measurements Up To Maximum of 18kW
MP-11 can measure the performance characteristics of PV strings
and arrays up to 18kW. But also single low power modules can be
measured accurately.
3. Sensor Unit
It is designed to provide maximum flexibility for any measurement
situation. The Sensor Unit with built-in data logger can work
independently from the Main Unit without cable connection; it can be
setup and adjusted to the same tilted angle and direction as the
subjected PV module. Since the Sensor Unit has a built-in data logger,
it can be separated from the Main Unit regardless the distance
between MP-11 main unit and best location to perform the radiation
and module temperature measurements. The Solar irradiance can be
measured either with the small pyranometer integrated with the Sensor Unit or through an external radiation
sensor connected to the terminal blocks on the back-side. 2 temperature channels are available to measure
the Modules backside temperature and ambient temperature with T-type Thermocouple
When used remotely, the time stamped irradiance and temperature data can be easily downloaded to the
Main unit when connecting the sensor unit. When the Sensor Unit and the Main Unit are permanently
connected, it is possible to display real time measurement.
4. STC Conversion Compliance to IEC 60891 Standard
MP-11 is capable to perform the STC conversion for crystalline PV modules complying to the IEC 60891 (and
the JIS C8914/8919/8940) by using measured irradiance and module temperature. Therefore, if the module
parameters (Alpha, Beta, Kappa, Rs, module size) for one PV module are set, it automatically calculates the
operating performance as measured under standard test conditions (@ 1000 W/m2/ 25ºC) for the total array.
(Note: MP-11 doesn’t have spectrum conversion function toAM1.5.)
Figure 4-1.
Separate Main Unit & Sensor Unit

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5. Auto Measurement
For extensive analysis of the module or sting performance, MP-11 has an auto measurement function to
perform consecutive measurements during the day. The full data set can be displayed as,
Solar irradiance vs. Maximum output power (Pm)
Solar irradiance vs. Open Circuit Voltage (Voc)
Solar irradiance vs. Short Circuit Current (Isc)
6. Quick Sweep Time Measurement
The Solar irradiance and the power consequently generated by the PV module can change within a fraction
of a second. If the sweep time takes too long, the change in the solar irradiance will not be properly taken into
account during the I-V measurement and final STC conversion. The change of solar irradiance has a large
impact with respect to the I-V curve measured by the IV checker with longer sweep time. The MP-11 perfectly
measures the PV module performance.
7. Characteristics Graph Display
LCD on the Main Unit is capable of displaying the following characteristics graphs. It is useful for diagnosing
defects of PV devices.
di/dV-V characteristics which is the I-V characteristics differentiated in first order
Scalable I-V curve graph (x2, x4 to x8) for allowing to check even a slight distortion on the I-V curve
8. Measurement data
The Main Unit is capable of measuring, displaying, analyzing and storing measurement data; all functions that
can be accessed through the front panel key pad. Up to 300 I-V curves can be stored on board, which is
mostly sufficient for one day.
9. Easy report creation
Measurement report file in Excel format, which includes I-V curve result, can be easily created by PC
software after downloading measured data from MP-11. The report format can be customized by the user.
10. Protection Features
When the internal temperature exceeds 50℃, the CPU stops until the temperature becomes less than 45℃
so that measurements cannot be taken.

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4-2. Package Contents
Check the package contents first; if any missing item or damage is noticed, please contact EKO immediately.
Table 4-1 Package Contents
Standard Items
Qty.
Remarks
Item
No.
MP-11 Main Unit
1
Main Unit contains the following items:
Sensor Unit
1
PV Probe & Alligator Clips
2
1.5m: Red (+), Black (-)
1
Earth Cable
1
2
Sensor unit Cable
1
3m; Main Unit –Sensor Unit Communication
3
USB Cable
1
2m; Main Unit –PC Communication
4
T-type Thermocouple
2
3m
5
Battery Receptacle Box
1
8pcs AA
6
Fixing Plate for Battery
Receptacle Box
1
7
Shoulder Strap
1
12
AC Adapter
1
AC100-240; 12V1.0A
9
Accessory Carrying Pouch
1
8
Ni-mH Battery Charger
2
Set of 4pcs AA size Low Self-Discharge Ni-mH rechargeable
batteries (Panasonic eneloop)
(Japan: Standard attached, other area: Optinal)
10
006P 9V Battery
1
For sensor unit power supply (Japan only)
11
Inspection Report
1
Instruction Manual
1
CD-ROM
1
Includes Instruction Manual, Measurement Software, Device Driver
Note) Item No. shows the number of each item in Figure 4-2.
Note) Accessories are subject to change to similar product without notice.

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Figure 4-2. Accessories Included in the MP-11
Package
5. Thermocouple
(2ea)
1. PV Probe,
Alligator Clips
2. Earth Cable
3．Sensor Unit Cable
4. USB Cable
6. Battery Receptacle Box
7. Fixing Plate for
Battery Receptacle Box
9. AC adaptor
8. Accessory
Carrying Pouch
10. Ni-mH Battery Charger
11. 006P 9V Battery
12. Shoulder Strap

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5. Getting Started
5-1. Parts Name and Descriptions
Each part name and its main functions are described below.
1. Main Unit
Figure 5-1. Main Unit Parts Name and Functions
Main Unit Front
Main Unit Rear Panel
5. Keyboard
Opened Main Unit
1. Main Unit Cover
4. LCD Display
3. Rear Panel
2. Cushion Pad for
Sensor Unit Dome
11. USB Port
6. Modular Jack
8. Power Supply
Jack
7. PV Connector
9. Earth Terminal
10. Storage Space
13. Case Handle
14. Strap Hooks
12. Latch

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Table 5-1. Parts Name and Function -- Main Unit
Parts Name
Details
1
Main Unit Cover
All components, such as the sensor unit and the cables, can be stored inside
the main unit.
The cover can be removed by sliding the lid to the right side as it is opened.
2
Cushion Pad for Sensor
Unit Dome
Hold and protects the sensor unit dome inside the main unit.
3
Rear Panel
The connections for PV jacks (+/-), module jack, DC jack for the Battery
Receptacle Box are on the rear panel.
4
LDC Display
Displays the operation menu and measurement results.
5
Key Board
Operations, such entering parameters and starting measurements, are done
from this key board.
6
Modular Jacks
Used for the communication between the main unit and the sensor unit.
7
PV connector
There plus (+) and minus (-) jacks.
8
Power Supply Jack
Connect either AC adaptor or Battery Receptacle Box.
9
Earth Terminal
Connect ground for safety.
10
Storage Space
Sensor unit and the cables are stored in this space.
11
USB Port
Used for downloading/uploading the data to and from the PC.
12
Latch
Push this latch button to and lift the cover to open the Main unit cover.
13
Case Handle
Insert your fingers here for carrying the main unit.
14
Strap Hooks
Shoulder straps are attached to these hooks.

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2. Sensor Unit
Table 5-2. Parts Name and Function –Sensor Unit
Parts Name
Details
1
Angle Capturer
Detachable from the sensor unit by snap on. Using this part to setup the
sensor unit in the same slope angle as the subjected PV panel for solar
radiation measurements. See [5-3. Setting] for more details.
2
Dome & Screen
3
Spirit Level
Used for level adjustment for the angle capturer and sensor unit.
4
Integrated Pyranometer
Measures solar irradiance.
5
Power Switch
Switch ON/OFF for the Sensor Unit
6
Power LED
When the power is turned on, the LED lamp light and blinks every 1sec.
When the LED blinks fast, it indicates low battery condition.
7
Angle Adjustment Screws
Loosen this screw to make angle adjustment for the sensor unit. Tighten the
screw once the angle position is determined.
8
Modular Jack
Used for the communication between the main unit and sensor unit.
9
Battery Box
For 006P
10
Pyranometers Switch
Select either integrated pyranometer on sensor unit or the external
pyranometer. Integrated pyranometer IN, external pyranometer EXT
11
Sensor Terminal Block
Reference cell, external pyranometer, temperature sensor (thermopile)1,
temperature sensor (thermopile)2 can be connected.
12
Base Plate
Detachable Angle Capturer
⑩
10. Pyranometer Switch
Figure 5-2. Sensor Unit Parts Name and Function
Front Side
6. LED
1. Angle Capturer
2. Dome & Screen
3. Spirit Level
4. Integrated Pyranometer
5. Power Switch
7. Angle Adjusting
Screw
11. Sensor Terminal
9. Battery Box
8. Modular Jack
12. Base Plate
Rear Side

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3. Battery Receptacle Box
The Battery Receptacle Box can be
opened by sliding the front side panel in
the direction as shown on the left for
inserting and replacing batteries.
Replace the batteries with 8 AA size
nickel-metal hydride (Ni-mH) batteries.
Turn ON the switch when the battery is
used for operation.
Ni-H type batteries cannot be
recharged with this unit; use the
charger attached to this instrument.
※Do not use new batteries, old
batteries and different types of
batteries mixed together.
※Do not leave batteries inside the
battery receptacle box when the
MP-11 will not be used for a while.
Battery receptacle box can be stored
inside the Main Unit storing space.
Tilt the battery receptacle box to insert it
inside the storage space then fix it with
battery receptacle box fixing plate in
place using screws.
Figure 5-3. Battery Receptacle Box
Battery Receptacle Box Opened
Front Side
Slide This Way
Output Plug
Switch
Figure 5-4. Battery Receptacle Box in Storage Space

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5-2. System Configuration
EKO has achieved composing a product with wide range of PV module/array capacity from 10W to 18kW and
high measurement accuracy. MP-11 is capable for taking measurements with maximum rating voltage of
1000V and maximum rating current of 30A in the maximum power range of 18kW.
The system configuration is shown as below:
Figure 5-5. System Configuration
Disconnect Power Control
Unit or Inverter from PV
module/array electrically
before measurement.
WARNING
Reference Cell
External
Pyranometer
PV Module/Array
Back side temperature
Ambient
Temperature
PV Module
PV Array
Connection Box, Inverter
Sensor Unit
Main Unit
USB
RS485
Battery Box
AC Adaptor
PC

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5-3. Setting
HAZARDOUS VOLTAGE
ELECTRIC HAZARD
FOR INSTALLATION AND CONNECTION OF MP-11, ALWAYS FOLLOW BELOW INSTRUCTIONS:
※To avoid hazardous electric shocks, wear protective wears (such as insulating rubber gloves and boots).
※Do not connect to PV array which ratings are more than 30A, 1000V and 18kW ratings.
※To avoid any trouble with the use of MP-11, always turn ON the MP-11 firs then connect with PV
module/array, and disconnect with PV module/array before turning OFF the MP-11.
※Make sure to completely disconnect the PV module/array, which is subjected for measurement, from
power conditioner before measurements.
※Do not leave the MP-11 in direct sunlight for a long period of time. When the internal temperature
exceeds more than 50℃, measurements cannot be taken. Once the internal temperature decreases
below 45℃, MP-11 becomes operable by pressing the power button again.
1. Main Unit Connection
1) Power Connection
Connect either Battery Receptacle Box output plug or
AC Adaptor to the Power Supply Connector on the rear
panel.
2) PV Probe Connection
Plug in the Red PV Probe (+) on the PLUS terminal and
Black PV Probe (-) on the MINUS terminal on the inside
back face.
Connect the gator grips, on the end the PV Probes, to
the PV module/array terminal block. Make sure the
PLUS and MINUS when connecting them.
3) Sensor Unit Connection
Connect the Main Unit and the Sensor Unit with modular
cable.
4) PC Connection
To connect the MP-11 to PC, plug the USB cable connector
in the USB terminal on the rear panel.
5) Earth Connection
For safety, make sure to connect the earth terminal to
ground. Adjust one end of the earth cable as needed.
Figure 5-6. Rear Panel
Figure 5-7. Rear Panel Connections

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2. Sensor Unit Setup
1) Time Synchronization between the Sensor Unit and Main Unit
a. Turn on the Main Unit power
b. Adjust the Main Unit time as necessary
c. Connect the Main Unit and Sensor Unit with modular cable.
d. Turn on the Sensor Unit power. The LED lamp beside the power supply switch starts to blink.
The Sensor Unit time is synchronized with the Main Unit automatically.
※Once the time synchronization is completed, do not turn off the Sensor Unit power. If
the Sensor Unit power is turned off, the internal clock setting will be cleared.
When error message appears, check for Sensor Unit power switch or modular cable connection; make
sure the Sensor Unit is not turned to OFF.
For more details on error message, see [8-2. Starting MP-11] and [9-2. Error & Warning Messages]
2) Measurement With/Without Modular Cable
Select either to take measurement with or without the modular cable connection.
Taking measurements without modular cable connection:
The data saved in the Sensor Unit need to be downloaded to the Main Unit after the measurements.
※When using MP-11 without modular cable, make sure to insert batteries in Sensor Unit.
※When using Sensor Unit with batteries, LED lamp blinks every 1sec; when LED lamp
starts to blink every 0.5sec, it means the battery is low. Please replace the batteries.
※If the battery power is low, Sensor Unit may restart when modular cable is
connected/disconnected or Main Power is powered ON/OFF. There is no effect to the
data saving and data loading functions; however, the batteries need to be replaced.
Taking measurements with the modular cable connection:
The measurement data from the Sensor Unit can be
monitored on the Main Unit in real time, and no need to be
downloaded after the measurement.
3) Sensor Unit Setting using Angle Capturer
a. Set the Pyranometer Switch on the back side of the Sensor
Unit to “INT”(integrated small pyranometer).
b. Remove the Angle Capturer from the Sensor Unit.
c. Place the Angle Capturer on the subjected PV
d. Panel surface then adjust the level using the integrated spirit
level.
e. Confirm the shades of marker positions, which are marked on
the Angle Capturer dome, on the screen scale (see the image
“a”on the right); keep the record of this position by writing
down or taking a picture.
f. Place Sensor Unit near the PV panel where it does not get
shaded and set the Angle Capturer back on Sun Sensor Unit.
g. Adjust the Sun Sensor direction and angles using the
adjusting screws on the sides of the Sun Sensor unit, so that
the shades of the dome markers are in the same position as
in the earlier step (see image “b”on the right); once the
position is determined, tighten the side adjusting screws.
Figure 5-8. Sensor Unit Installation
Place Angle Capturer on the Sensor Unit
and adjust the position so the shade mark
is in the same position as recorded.
b.
a.
Confirm & record the position of the shade.

EKO INSTRUMENTS CO., LTD. I-V Curve Checker MP-11 Instruction Manual Ver.7
Pg. 19
h. Remove the Angle Capturer during the measurements so that radiation measurements would not
be affected by dome reflections and shades.
i. Finally, turn ON the Sensor Unit power and setup the parameter and take measurements
according to the procedure described in the [8. MP-11 Operation].
4) Using External Pyranometer, Reference Cell, and
Temperature Sensor
a. Set the switch on the back of Sensor Unit to [EXT]
side.
b. Connect each cable for external pyranometer,
reference cell, to their terminal block to the terminal
block on the back of Sensor Unit.
c. At last, turn ON the Sensor Unit power. Follow
[8-4. Setting Menu] to setup the parameter setting
then take measurements.
※Before taking measurements, make sure to enter the sensitivity value for the pyranometer or reference
cell in the parameter setting step on the Main Unit. (See [8-4. Setting Menu] for parameter setting
details.)
※Do not place the Sensor Unit where high temperature radiation heat; the Sensor Unit may stop
operation due to decrease in battery voltage by extreme temperature increase inside the unit.
Figure 5-9. Pyranometer Setting
INT ◀PYR ▶EXT
Switch to [EXT] for external sensors