Automated thermal voltage converter intercomparisons

Kinard, J.R.; Williams, E. S.; Lipe, Thomas E.

doi:10.1109/proc.1986.13412

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…1, SWI is a set of mercury-wetted relays to switch input voltages in sequence and SW2 is a set of pneumatically operated low-thermal switches to measure TVC output EMF. As in some other laboratories [3] …”

Section: A Comparatormentioning

confidence: 57%

AC-DC difference measurements on thermal voltage converters at NRC

Matsumura

Clark

1987

IEEE Trans. Instrum. Meas.

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Section: A Comparatormentioning

confidence: 57%

AC-DC difference measurements on thermal voltage converters at NRC

Matsumura

Clark

1987

IEEE Trans. Instrum. Meas.

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“…The values of the n-factor test of the new design are firstly measured at different current ranges by changing in the output e.m.f, ΔE, when the dc nominal input current is varied by ±0.5%. Where the relation between the input current of the source and its output e.m.f is expressed as [17]:…”

Section: Calibration and Uncertainty Evaluation Resultsmentioning

confidence: 99%

“…It is found that the values of the n-factor test of our new design were from 1.8 to 1.9 at the different current ranges. And the ac-dc differences (δm) for the new TCC from 1 A to 5 A at different frequencies from 55 Hz to 5 kHz are also determined from the following [17], [25]:…”

Section: Calibration and Uncertainty Evaluation Resultsmentioning

confidence: 99%

“…It also provides fast switching between ac and dc signals to keep constant thermal conditions. Furthermore, the switching between ac and dc currents is done at constant regular time intervals [16], [17]. Main idea of the proposed design is using single junction thermal converters to obtain the required output current without shunt resistor.…”

Section: Construction Of the New Automated Multirange Tccmentioning

confidence: 99%

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Establishment of new automated multi range thermal current converter

Abdelmonaem

Ali

Shatla

2023

IJPEDS

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<p>A new automated multirange thermal current converter (TCC) has been designed and implemented at the National Institute of Standards (NIS), Egypt. Five single junction thermal current converters (SJTCCs) have been connected in parallel on PCB with an LCD, keypad and a microcontroller to control a five fast switching relays. This TCC has been designed to cover the ac current ranges from 500 mA to 5 A at frequencies from 40 Hz up to 100 kHz. The construction of the new automated TCC has been presented to solve some problems of using shunt resistance at high currents. Furthermore, a new automatic calibration system has been established to calibrate the established TCC against another standard TCC. This software program has been specially designed using MATLAB program to overcome the problems of manual calibration and measurement. The expanded uncertainties are estimated for all ranges at different frequencies and also, the ac-dc differences. The performance of the new automated TCC is also evaluated by comparing its accuracy by measuring ac currents at different frequencies with the performance of a traditional TCC.</p>

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“…This kind of sensor is called thermal-elements [1]. When the difference between V ac and V dc is small, the proportional difference can be computed from eqn (1) [2]:…”

Section: Introductionmentioning

confidence: 99%

Automatic determination of the Thin-Film Multijunction Thermal Voltage Converter parameters

Ali¹

2014

WIT Transactions on Ecology and the Environment

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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.

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Automated thermal voltage converter intercomparisons

Cited by 5 publications

References 5 publications

AC-DC difference measurements on thermal voltage converters at NRC

AC-DC difference measurements on thermal voltage converters at NRC

Establishment of new automated multi range thermal current converter

Automatic determination of the Thin-Film Multijunction Thermal Voltage Converter parameters

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