ASTM D1807 Test Methods for Refractive Index and Specific Optical Dispersion
ASTM D1807 Standard Test Methods for Refractive Index and Specific Optical Dispersion of Electrical Insulating Liquids
5. Apparatus
5.1 Refractometer - The refractometer to be used in the routine method shall have an index range of approximately 1.33 to 1.5 and be readable to ±0.0002 units. The refractometer used in the referee method is described in Test Method D1218.
5.2 Light Source - A suitable incandescent illuminator shall be used as a light source for determinations made by the routine method; suitable light sources for the referee method are described in Test Method D1218.
5.3 Thermostat - A thermostat capable of supplying water to the jacketed prisms of the refractometer shall be capable of maintaining a temperature constant to within ±0.1°C.
