Automatic Determination Of The
Thin-Film Multijunction Thermal Voltage
Converter Parameters
Author(s)
R. S. M. Ali
Abstract
The Thin Film Multijunction Thermal Converter (TFMJTC) has become the
most sensitive and precise transfer standard for the accurate measurement of the
ac quantities. Therefore, its parameters are determined at the National Institute of
Standards (NIS), Egypt, to obtain its best operating conditions. These parameters
are short-term stability, settling time, dc response time, n-factor, input/output dc
curve and frequency response. All these parameters are determined automatically
by using LabVIEW programs. From the results, it is found that the TFMJTC
stabilizes at time 50 sec. At this time it has accepted short-term drifting error,
29 ppm, which can be considered its settling time. It is also shown that the 5 sec.
is the response time of the TFMJTC. It is also shown that the practical response
of the TFMJTC is according to the square-law at the test voltage from 40% to
100% of the rated voltage and the ac voltage is converted to the output dc
voltage in a true square-law response with negligible deviation from the
theoretical results. It can therefore be used successfully in these test voltages.
The TFMJTC has lower uncertainty in calibrating the ac signals.
Keywords: AC-DC transfer standard, Thin Film Multijunction Thermal
Converter, AC voltage calibration.
Keywords
AC-DC transfer standard, Thin Film Multijunction Thermal
Converter, AC voltage calibration.
Related Book
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