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ISM-50-R-V01 measurement device for light reflection as per DIN-5036 T3

Light reflectance measurement in 8/d geometry

The ISM-50-R-V01 integrating sphere light meter is used for measurement of light reflectance, the degree of the scattered reflectance and calculation of the regular reflectance proportion. Sample illumination is done from an 8° angle. The regular or scattered reflected light from the sample is captured by the integrated sphere. This 8/d geometry corresponds to the specifications in DIN 5036 section 3. the light source is set to a 2856 K color temperature (standard illuminant type A). The high-quality silicon photodiode of the photometric detector is carefully matched onto the V(λ) responsivity function through a multi-layer spectral correction filter.

Integrating sphere with a 50cm diameter

Integrating spheres with a large diameter such as the ISM-50-R offer a wide detection angle for scattered reflected light. The measurement ports are additionally designed with knife-edges. The sphere is coated with Gigahertz-Optik‘s self-manufactured diffusely reflective coating made of barium sulfate. The multi-layered coating ensures magnificent levels of diffuse reflection over the entire usable spectral range.

Correction of self-absorption effects by the samples

The integrating sphere has two measurement ports onto which samples and reflection standards can be interchangeably placed. Self-absorption effects by the samples and calibration standards can thereby be compensated. The sample holders are attached onto the socket in the sphere and enable measurement of extensive samples.

ED-ISM-100-VL control electronics

The light source is operated with constant current through a 16-bit DA-converter and hence ensures light stability. The ramp function of the power adapter minimizes stress on the lamps while switching on/off. The photometric detector light meter of the integrating sphere allows for measurement routines for the calibration, substitution correction, measurement of both the entire and regular reflectance as well as calculation of the scattered reflectance proportion.

Diffuse reflection standards

Gigahertz-Optik offers its self-manufactured diffuse reflection standards with traceable calibrations.

The quick-change holder on the 8° port enables fast exchange of plugs and light traps
Sample holder with height-adjustable sample support for attachment of calibration standards
Measurement range

0.5% to 100% with 0.01% measurement value resolution

dynamic range

200 (dark signal measurement 0.5% with -8° and a very low scattering mirror at the measurement port

typical Measurement uncertainty

± 0.5% incl. the uncertainty of the calibration standards


± 0.1*[1-log10rg]%; rg = regular/hemispherical


± 0.6% (k=2), diffuse reflection (ODM98)

Integrating sphere

500mm diameter with barium sulfate coating (ODP97)

Measurement port

50mm diameter with knife-edge

Self absorption correction port

50mm diameter with knife-edge. 90° position for the measurement port

Sample holder

With pull springs. Shadowing of the measurement port from ambient light. Attachment of the calibration standard

Detector port

-8° port:25mm diameter. 8° alignment to the measurement port. Slide&Fix holder for fast exchange of port plugs (reflectance measurement) and light traps with 10mm aperture (scattered transmission measurement)

Detector port

+8° port: 50mm diameter. 8° alignment to the measurement port


Photometric detector head with 1cm² light-sensitive surface

f1' (spectral mismatch)

f1’ uncertainty <6% (DIN 5052 T7 class B)

Measurement signal

approx. 20.3nA with BN-R98-D2 reflection standard. 8° port with port plug

Light Source

Radiation bundle with -8° direct alignment to the center of the measurement port and alignment of the reflection rays –8° port

temperature range

2856K +/-20K (Standard illuminant A)

Light Source

LH-100-UV, 100W/12V quartz halogen lamp


Cooling of the lamp holder through active air circulation using a fan


Laboratory cables with banana plugs

Light Guide

Approximate 18mm diameter on the sample and approx. 9mm on the –8° port

warm up time

Approximate 10min


Similar to the X1-RM optometer. ISM-50-R-V01 Firmware.

Calibration, substitution correction, measurement of the transmission degree, measurement of the scattered light proportion, calculation of the directed light proportion, display in %
Remote control of the lamp power supply unit


LCD graphic display 97x32 pixel
Active size 14.3mm x 35.8mm
LED backlight can be switched on/off
Text display 4 rows, 14 characters per row

Operation buttons on the front control panel


temperature range

Operation: 5 to 40°C
Storage: -10 to 50° C

Lamp power supply

Similar design to the LPS-100-RM.

Output power

100W / 0 - 10A / max. 13.5V



temperature range



+-1mA over 8 hours, 60 min after switch on in a constant environment


RS232 / RS485: 19200 Bd, 8D, 1S, N

temperature range

Operation: 10 - 30°C (with free air circulation)
Storage: 5 - 50°C

Power Supply

120 to 230 VAC, 50 to 60Hz


3/4 19” broad bench-top housing similar to the BTH-19-3-4

Type Description File-Type Download
Datasheet ISMP-50-R-V01 PDF
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15298127 ISMP-50-R-V01

Light meter with integrating sphere measurement device and control electronics.

15298062 BN-R98-D2C-PP

Diffuse reflection standard with calibration certificate

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