Fluke 1523 - 7 Calibration of Your Reference Thermometer Readout; General; Introduction; Terminology

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Calibration of Your Reference Thermometer Readout
Calibration Equipment
7 Calibration of Your Reference Thermometer Readout
7.1 General
NOTE: For assistance with the process or any questions regarding the calibration of
the Reference Thermometer, contact an Authorized Service Center. (See Section 1.8,
Authorized Service Centers on page 5.)
This procedure is to be considered a general guideline. Each laboratory should write
their own procedure based on their equipment and their quality program. Each proce-
dure should be accompanied by an uncertainty analysis also based on the laboratory’s
equipment and environment.
The 1523/24 Reference Thermometers are calibrated with a traceable calibration at
the factory. This calibration is supported by good practices including an extensive
uncertainty budget.
7.2 Introduction
The reference resistors and voltage source must have low enough uncertainties to
t within your uncertainty budget. These uncertainties consist of a number of items
including temperature coefcients and long term drift. There are other uncertainties to
consider as well.
7.3 Terminology
NOTE: The Unit Under Test is referred to as the (UUT).
7.4 Fundamentals
It is assumed that the user is familiar with the 1523/24 Reference Thermometer User’s
Guide and Technical Guide.
The user shall be familiar with 4 wire and 2 wire resistance connections.
The user shall be familiar with the voltage source.
7.5 Environmental Test Conditions
Temperature range: 23°C ± 4°C
Ambient relative humidity: below 60%
7.6 Calibration Equipment
The tables below describe the equipment needed to perform a 1523/24 reference ther-
mometer calibration. The specications for the reference resistors and voltage source
are minimum requirements to meet a test uncertainty ratio (TUR) of 4 to 1.
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