APPARATUS

The apparatus  consists of  a test  plate  and a  comparator. A  black  plate  is  used  as a

comparator for test plate. When all the physical, dimensions and the temperatures are

equal, heat losses from both plates will also be the same, except radiation losses. Hence

the input difference will be due to difference in emissive. Both the plates are kept in a panel

enclose  with perplex front  and are given  inputs  through  separate dimmerstats  so that

temperatures of both can be kept equal. Thus emissivity can determine over a wide range

of temperatures.

SPECIFICATIONS:

1.  Test plate & Black plates -160mm. Dia. AL plates, mounted with mica heater inside.

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

3.  Separate dimmers for both the plates.

4.   Multichannel digital temperature indicator.