Ametek Land Landcal P80P, Руководство пользователя, Страница: 7 / 24

Page 1
User Guide Landcal P80P
Calibration Source
1 Landcal Blackbody Source Type P80P
1.1 Introduction
The LANDCAL blackbody source type P80P is a variable temperature, portable
black body radiation source designed for use at temperatures up to 80°C
(175°F).
The source is a primary standard black body for the high precision calibration
of radiation thermometers over the range -10 to 80°C (15 to 175°F). When
the set point temperature is reached, the output from the thermometer under
test is compared with the temperature of the source as measured by an
optional Platinum resistance thermometer whose calibration is traceable to
National Standards.
When used in conjunction with the Platinum resistance thermometer which
is supplied complete with a UKAS (United Kingdom Accreditation Service)
calibration certificate, high precision is obtained. Alternatively the source can
be used in three other ways.
1) If traceability to National Standards is required to a larger value of
uncertainty a UKAS certificate of calibration for the source can be
supplied. The relationship between the indicated temperature on the
controller and the radiance temperature as measured by a secondary
standard radiation thermometer is reported.
2) The temperature of the source can be measured by using a radiation
thermometer of traceable calibration. This method of calibration can
be described as calibration by comparison with a standard radiation
thermometer. This method of calibration usually results in the most
accurate as errors due to temperature gradients and non-black body
conditions are eliminated.
3) If traceability to National Standards is not required, the source can be
used without any certification. From previous work the temperature,
as shown on the controller indication, has been found to agree with the
radiance temperature to within ±4K (±8°F).
The source provides a wide angle target which makes it ideal for use with
both fixed installation and portable, hand-held thermometers.
To make the lining up of LAND fixed installation radiation thermometers
simpler, an optical bench assembly is offered as an optional extra. When the
source is stood on the optional transportation case, the bench to mid target
dimension equals that of the optical bench assembly.