HEITRONICS has been producing high quality cavity blackbodies for the last 40 years.  Current blackbodies offered by HEITRONICS are outlined in the table below.

Within the marketplace, there are two ‘styles’ of Infrared Radiation Sources, which are also sometimes referred to as Infrared CalibratorsBlackbody Calibrators or Blackbody Radiators.

SW11 Blackbody Calibration Source


HEITRONICS utilizes a cavity in the construction of its blackbodies, which is common practice for producing high emissivity.  HEITRONICS blackbodies produce emissivity between 0.99 and 0.9994 per the respective model.


Other blackbodies in the marketplace may utilize a flat plate which will typically have an emissivity between 0.95 to 0.96.  Sources of this kind are correctly referred to as a ‘plate radiation source’ due to their relatively low emissivity and, as such, are not truly a ‘blackbody’.  The errors that can be induced by such a low emissivity when performing low-end temperature calibrations is a topic that should be carefully considered by consulting with the provider of such sources,  if the subject is not specifically addressed in the documentation supplied with the plate radiation source.


HEITRONICS and Wintronics personnel are available to discuss the technical merits of applying a HEITRONICS Transfer Radiation Thermometer for use with such plate radiation sources.





Compared to the relatively small cavity diameters offered by HEITRONICS and other cavity blackbody producers in the market, plate radiation sources are commonly the source of choice when calibrating relatively low-cost single spot measuring pyrometers, such as the popular handheld infrared thermometer with 8 … 14 microns ( or similar ) spectral range. A primary reason that these instruments are low in cost is influenced by the low cost optics used in the design, which produces low optical resolution. With the low optical resolution, the FOV becomes too large for acquiring the energy emitted from a Ø1 inch cavity, for example. A very popular and high quality plate radiation source has a Ø6 inch radiator.  Large area plate radiation sources are also commonly used for thermal image camera performance testing.


HEITRONICS cavity blackbodies are available to be operated between -20 … 1000 °C. The high quality construction of HEITRONICS cavity blackbodies is evidenced by the continued operation of these blackbodies, made over 30 years ago, by the Wintronics calibration laboratory.


Blackbodies offered by HEITRONICS are commonly used to calibrate pyrometers, infrared thermometers and radiometric thermal imaging cameras.

Technical Data

Type SW10C SW11B SW20 SW15
Temperature Range 50 to 400°C

350 to 1000°C

30 to 95 (150)°C 100°C
- Aperture
- Depth
40 mm
120 mm 
20 mm
37 mm 
Emissivity >= 0,99




Real temperature control external thermocouple
or Pt100
external thermocouple 
or Pt100
external thermocouple 
or Pt100
external thermocouple 
or Pt100
Uniformity of
cavity temperature

< 1oC

< 1oC

< 0.2°C

< 1°C

built-in Pt100 built-in NiCrNi
s. Thermostat   PTC
Dimensions 189 m
L320 mm
180 mm
L 320 mm

H 260 mm

45 mm
H 95 mm

Weight radiator 8.2 kg 7.5 kg

ca. 3.5 kg

0.35 kg

Weight stand 2.15 kg 2.15 kg






Regulators for electronic control of radiators

Model SR10C SR11B SW20 Thermostat
Temperature Range 0-400°C


-50 to +150°C
Input Pt100 NiCrNi TC  
Voltage 115 ±10% VAC

115 ±10% VAC

115 VAC

Regulation Type PID PID PID
Adjustable Accuracy




Dimensions 235 x 145 x 360 mm 330 x 145 x 360 mm  
Weight 4 kg 10.5 kg

2.4 kg

Calibration brochure:


Wintronics Calibration provides the highest level of measurement service available today to ensure the exacting quality you demand from your measurement equipment.




Field Engineer Calibration:

Wintronics' Field Service Engineer Calibration Program manages all your service engineers' calibration needs - from equipment scheduling and tracking to shipping and calibration - and provides quality reports and certificates of calibration.