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The BTS256-LED light meter

In its standalone mode, the compact BTS256-LED meter is designed for the convenient measurement of luminous flux, spectrum, color, and color rendering index of single LEDs. A key feature is the conical measurement port at the entry of the internal integrating sphere which enables the measurement of onboard LEDs. The bayonet connector used to attach the conical adapter makes it possible to combine the BTS256-LED with other accessory components. Gigahertz-Optik offers different accessories as part of the BTS256-LED Plus Concept which greatly extends the measurement capabilities of the BTS256-LED.


Enhancement of the BTS256-LED using the ISD-21-V01 integrating sphere

The ISD-21-V01 integrating sphere makes it possible to measure the luminous flux, spectrum, color, and color rendering index of single LEDs with diameters of up to 10 mm (BTS256-LED without additional integrating sphere) as well as of LED matrices and LED spot lamps with diameters of up to 63.5 mm. The integrating sphere is equipped with an auxiliary lamp for self-absorption correction. The BTS256-LED can still be used for single, onboard LEDs. A bayonet adapter enables connection of the device onto the ISD-21-V01 integrating sphere.


Calibration

One essential quality feature of photometric devices is their precise and traceable calibration. The ISD-21-V01 with the BTS256-LED is calibrated by Gigahertz-Optik’s calibration laboratory that is accredited by DAkkS (D-K-15047-01-00) for the spectral responsivity and spectral irradiance according to ISO/IEC 17025. Calibration of the luminous flux is done using a BN-LHSF-2P-20 calibration lamp that has 2pi radiation characteristics in the sphere. Every device is delivered with its respective calibration certificate.

BTS256-LED spectroradiometer with integrating sphere for LED spot lamps with diameters of up to 63.5 mm

1) BTS256-LED 2) 50mm integrating spherel 3) Precision bayonet mount 4) BiTec sensor with Si photodiode, CMOS diode array spectrometer and shutter 5) Microprocessor 6) USB interface 7) ISD-21 integrating sphere 8) Bayonet mount 9) Baffle 10) Auxiliry lamp 11) Measurement port

BTS256-LED for measurement of the luminous flux, spectrum, color, and color rendering index of single LEDs

The S-BTS256 user software for the luminous flux with integrated and external sphere.

Full screen display of the luminous spectrum

CIE 1976 chromaticity diagram with binning fields

Substitution correction menu

General
Short description

Spectroradiometer for efficient measurement of the luminous flux, spectrum, color, and Color rendering index of LED spot lamps with diameters of up to 63.5 mm

Main features

Integrating sphere with a 21 cm diameter and 63.5 mm measurement port. Spectroradiometer can be used without the integrating sphere – for measurement of single LEDs.

Range of measurement

0.3 lm to 35000 lm, 380 nm to 750 nm

Typical applications

Inspection of incoming products (single LEDs), LED spot lamps with a diameter of up to 63.5 mm, quality assurance in production processes, design

Calibration

Factory calibration. Traceable to international standards

Product
General

This device is based on the BTS256-LED, please find detailed specification there.

Calibration uncertainty

Luminous flux calibration +/-8%

Input optics - ISD-21-V01

Integrating sphere with barium sulfate coating. Measurement port with 63.5mm diameter. Port reducer with 50.8mm diameter and knife-edges. 12V/20W Halogen auxiliary lamp. Table stand.

Spectral Detector
Measurement Range and Measurement Time

BTS256-LED: max. 1000 lm ≤ 5ms (white light)

BTS256-LED: min. 10 mlm ≤ 30s (white light)

 

BTS256-LED with ISD-21-V01: max. 35000 lm ≤ 5ms (white light)

BTS256-LED with ISD-21-V01: min. 350 mlm ≤ 30s (white light)

Integral Detector
Max. measurable luminous flux

BTS256-LED Tester typ. 70000lm
BTS256-LED Tester with ISD-21 typ. 2000klm

Noise equivalent luminous flux

BTS256-LED Tester typ. 0.05mlm
BTS256-LED Tester with ISD-21 typ. 2mlm

Type Description File-Type Download
Datasheet ISD-21-BTS256-LED PDF
Dimensions BTS256-LED Tester + ISD-21-V01 PDF
Produktname Product Image Description Show product
S-SDK-BTS256 Software Development Kit for BTS256 variants.
Article-Nr Modell Description Request / Compare
Product
15297933 ISD-21-V01

Integrating sphere with 63.5 mm port, Detector port for the BTS256-LED. Baffle for shadowing of the measurement port. Auxiliary lamp, table stand

15297817 BTS256-LED

Measurement device, BTS256-LED-CA10 cone adapter, USB cable, hard-top casing, operation manual, S-BTS256 software, calibration certificate.

Calibration
15300227 K-BTS256-LED-U-I

Calibration of the BTS256-LED with external integrating sphere

Re-calibration
15300226 K-BTS256-LED-I

Recalibration of the BTS256-LED Tester. Only possible with the 10mm cone adapter

15300227 K-BTS256-LED-U-I

Calibration of the BTS256-LED with external integrating sphere

Software
15298218 S-SDK-BTS256

Software Development Kit for the implementation of the BTS256 or variants into custom made software

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