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Spectroradiometers

EKO Instruments compact all-weather MS-series spectroradiometers are unique in many ways and share the following features.

  •  Made for permanent outdoor usage
  • Low temperature dependency of the detector
  • Temperature controlled spectrometer
  • Fully controllable by PC or data logger
  • High quality calibration, NIST traceable

 WISER_Max

Since their introduction, they were widely used as reference instruments for outdoors spectral irradiance measurements in the fields of Photovoltaic and Meteorological research. In 2001 the MS-700/701 was successfully introduced and adopted by researchers. Since then, the MS series expanded, with sophisticated instruments like MS-711 and MS-712 or MS-713 which cover a wide spectral range for VIS-NIR-IR applications. The MS-series now covers a spectral range from 300nm up to 2550 nm. All spectroradiometers benefit from an advanced spectrometer which is temperature controlled at a fixed temperature to maximise performance in a wide operating temperature range. During the years we proved that long term stability was one of the success factors of the MS-series spectroradiometers.

The spectroradiometers MS-700N/711/712/713 are supplied with a separate power control unit with RS-232/422 serial communication interface. Those can be fully controlled by a PC, where the operating software offers advanced functionalities for data retrieval and data storage. It is also possible to create a customized software and to get the same control functionalities by using the operating commands.

Models

Product Model Description
MS-700N Spectroradiometer

MS-700N Spectroradiometer

The new generation grating spectroradiometer MS-700N is designed to provide the most accurate solar …
MS-711 Spectroradiometer

MS-711 Spectroradiometer

The new generation grating spectroradiometer MS-711 is designed to provide the most accurate solar …
WISER (MS-711|MS-712) Spectroradiometer

WISER (MS-711|MS-712) Spectroradiometer

For solar spectral research, we believe only one measurement concept can be the best. The combination …

WISER (MS-711|MS-713) Spectroradiometer

WISER (MS-711|MS-713) Spectroradiometer

Made for Solar research activities which require spectral information measured in a very broad spectral …

MS-720 Spectroradiometer

MS-720 Spectroradiometer

MS-720 portable spectroradiometer is designed to measure the spectral irradiance in the range from …

LS-100 Spectroradiometer

LS-100 Spectroradiometer

The LS-100 grating spectroradiometer is specially designed for measuring the spectral irradiance of …

Specifications

Specifications (Typical)

MS-700N

MS-711

MS-712

MS-713

Wavelength range (nm) 350 - 1050 300 - 1100 nm 900 - 1700 900 - 2550
Detector Array (pixels) 2048 2048 512 -
Spectral resolution (Data file) 1 / 10  nm 1 / 7 nm  1 / 7 nm 20 nm
Spectral resolution (measurement) < 10 nm < 7 nm < 7 nm < 20 nm
Wavelength accuracy < 0,3 nm  < 0,2 nm < 0,2 nm  < 2 nm 
Response time (Exposure time) 10ms - 5sec  10ms - 5sec  10ms - 5sec   1ms - 40msec
Non-linearity (at 1000W/m²) - -  - -
Directional response  < 7% < 5%  < 7% < 3%

Temp. response (-10ºC to 40°C)

 < 2%

< 2%

 ± 5 %

< 2 %

Control Temperature 25 ºC 25 ºC   25 ºC/5 ºC -20 ºC
Operating temperature range (°C) -10 to +50 - 10 to +50 - 10 to +40   - 30 to +50
Cable length 10 m 10m  10 m 10 m
Dome material Quartz Quartz BK7 Quartz
Software Applicable to MS-Windows 95/98 SPDac-for measurement, SPMan-for data analysis Automatic calculation of spectral match accuracy (IEC904-9)
Unit of output W/m²µm
Power supply External Control and power supply

Specifications (Typical)

MS-720

LS-100

Wavelength range (nm) 350 - 1050 350 - 1050
Detector Array (pixels) 256 256
Spectral resolution (Data file) 1 / 10  nm 1 / 10  nm
Spectral resolution (measurement) 10 nm 10 nm
Wavelength accuracy < 0,3 nm < 0,3 nm
Response time (Exposure time) - 10ms - 5sec 
Non-linearity (at 1000W/m²)  -
Directional response  -  -

Temp. response (-10ºC to 40°C)

± 5 %

± 1 %

Control Temperature  N/A N/A 
Operating temperature range (°C)  -10 to +40 -10 to +40 
Cable length  N/A N/A 

Applications

Spectral global horizontal irradiance (VIS + NIR)

Spectral global horizontal irradiance (VIS + NIR)

MS-700 is the all weather grating spectroradiometer suitable for continuous outdoor usage can be applied in different research applications. The spectral sensitive range from ...

Spectral global horizontal irradiance (UV)

Spectral global horizontal irradiance (UV)

MS-701 is the all weather grating spectroradiometer for the continuous outdoor use. The spectral range of MS-701 is 300-400nm, which cover the UV(Ultraviolet) range, and the attached ...

Spectral irradiance portable solutions

Spectral irradiance portable solutions

Reflection and transmission measurements on materials, vegetation, water or atmosphere give valuable information about biological, physical and chemical processes. Processes driven ...

Measure spectral irradiance of sun simulator

Measure spectral irradiance of sun simulator

Sun simulators are available in different classes indicating the performance characteristics by the combination of three letters (A,B or C) (according to IEC 60904, JIS 8912 and ASTM ...

Spectral DNI Measurements

Spectral DNI Measurements

Spectral DNI measurements can be obatined from the MS-700 DNI which provides 10 nm data in the range 350 nm - 1050 nm. Since the solar spectrum will substantially vary as a function ...

Calibration & Traceability

The MS-spectroradiometer is calibrated against a NIST traceable tungsten-halogen OL-FEL standard lamp at a distance of 50 cm. The standard lamp has a known spectrum and the absolute irradiance is calibrated at several wavelengths. By measuring the spectroradiometer's detector response as a function of the irradiance at corresponding wavelengths, the sensitivity of each photo diode array pixel is converted into absolute units (W/m2/µm).

 

In order to use optimal output characteristics of the detector, the calibration function is determined by averaging 10 single measurements, measured separately for 3 different wavelength intervals each with a fixed exposure time. . Finally the calibration function is uploaded to the spectroradiometer firmware for automatic conversion of measured count into absolute units.

 

Pyranometer measures the total solar irradiance according to the integration of the spectral irradiance curve.


I=∫I(λ)dλ (W·m-2

Spectroradiometer measures the solar irradiance of each wavelength

.
I(λ) (W·m-2·µ·m-1)

 

The combined uncertainty of the calibration function for each wavelength interval is based on individual uncertainties contributed by the standard lamp, calibration set-up and spectroradiometer performance properties. The individual parameters are provided on each calibration certificate and can be used to validate the measurement data.

Frequently Asked Questions

Soiling effect versus measured irradiance

Soiling effect versus measured irradiance

What is the effect of soling versus the measured irradiance? Measuring solar radiation with pyranometers, pyrheliometers or spectroradiometer, soiling has will have an effect ...

Re-calibration interval of solar sensors

Re-calibration interval of solar sensors

The sensitivity of the solar sensor will slightly deviate with time when it is exposed to solar radiation. Therefore it is advised to re-calibrate the sensor every two years. For calibration ...