1523, 1524 Reference Thermometer
Preparation for Reference Thermometer Calibration
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7.7.2 As Found Data Procedure
As Found data is used to determine if the readings and measurements taken since the
last calibration are within specication. The data is also used to determine the amount
of “drift” (how much the accuracies have changed over time) that the instrument has
undergone.
7.7.2.1 As Found Calibration Parameters
Recording the as found calibration parameters allows the user to compare the current
parameters to the parameters set during the last calibration.
7.7.2.2 As Found Data
The data taken at this step allows the user to compare the results to the previous
calibration.
7.7.3 Alignment Procedure
The alignment procedure aligns each of the reference thermometer’s ranges to a set of
known reference voltage and resistance standards. Reference points and their adjust-
ment values are reset.
7.7.3.1 Alignment Test Data
Once the reference points have been set and their adjustment points reset to zero, data
at each calibration point is taken for each of the voltage and resistance ranges.
7.7.3.2 Calculate New Adjustment Values
The alignment test data is used to calculate new Adjust (ADJ) values for each range
based on the errors of certain cal points.
7.7.4 As Left Data
Data at each calibration point is taken for each of the voltage and resistance ranges
and compared to the accuracy specications. The standard deviation of the readings is
calculated to ensure that it meets the specication.
7.8 Preparation for Reference Thermometer Calibration
7.8.1 Serial Communication
Enable the serial port of the UUT by pressing the SETUP key. Press NEXT to high-
light Select Instrument then press ENTER. Press NEXT until the parameter Serial Port
is shown. Toggle the up / down keys to select On and press ENTER. Press SETUP or
HOME to return to the main screen.
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