A test plate and a comparator make up the device. The test plate is compared to a black plate. Heat losses from both plates will be the same, with the exception of radiation losses, when all physical parameters, including dimensions and temperatures, are comparable. Therefore, the difference in input will be caused by the emissive. Both plates are housed in a panel enclosure with a perplex front and have inputs from different dimmerstats so that their temperatures can be maintained at the same level. As a result, emissivity can be determined at many different temperatures.

SPECIFICATIONS

• Test plate and Black plates — 160mm. Dia. Aluminum plates, mounted in Panel with mica heater inside.
• Instrumental panel consisting of-

a)Voltmeter and ammeter for input measurement to both heaters through a selector switch.

b)Separate dimmers for both the plates.

c)Multichannel digital temperature indicator.

 A technical manual accompanies the unit.

SERVICES REQUIRED:

• Space area of 1.5m x 1 m. at working height.
• 230v, 15A, AC supply with earthing connection