This paper describes the new primary standard for the ac-dc current transfer at Inmetro, based on... more This paper describes the new primary standard for the ac-dc current transfer at Inmetro, based on PMJTCs and the new shunts manufactured by Fluke for rated currents from 10 mA up to 20 A. The build-up of the ac-dc current scale is described together with the uncertainty budgets which result in final uncertainties at 5 A of 6 μA/A to 12 μA/A in the frequency range from 10 Hz to 100 kHz. These are small compared to international standards.
A primary standard of ac current at low frequency is derived from the standard of dc current by a... more A primary standard of ac current at low frequency is derived from the standard of dc current by ac-dc transfer instrument. A set of 15 thermal current converters(TCCs) have been constructed as the primary current standards from 5 mA to 20 A at the frequency range of 10 Hz to 100 kHz. It is evaluated that the uncertainties for the maintenance and dissemination of ac current standard are less than 52 ppm up to 20 mA and 20 kHz, 60 ppm up to 100 mA and 20 kHz, and rising to 200 ppm at higher currents and frequencies.
A new AC-DC voltage transfer system has been established at UME. The standards consist of a group... more A new AC-DC voltage transfer system has been established at UME. The standards consist of a group of planar multijunction thermal converters (PMJTC), whose basic level (1 V to 3 V) is calibrated in PTB. A new software developed at UME is used for step-up and down procedures in order to establish voltages from 2 mV to 1000 V in the frequency range from 10 Hz to 1 MHz.
IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188), 2000
Proceedings of 20th Biennial Conference on Precision Electromagnetic Measurements, 2000
The improved design of the fast reversed DC source allows the measurement of thermoelectric effec... more The improved design of the fast reversed DC source allows the measurement of thermoelectric effects in thermal converters of all designs and serves as a basic tool to control reference standards for ac-dc transfer. Residual effects in thermal converters are measured which are explained by nonuniformities in the heater material
Proceedings of Conference on Precision Electromagnetic Measurements Digest, 2000
A fast-reversed-dc current source has been developed for the purpose of evaluating the ac-dc tran... more A fast-reversed-dc current source has been developed for the purpose of evaluating the ac-dc transfer differences due to thermoelectric effect of thermal converters. By use of a novel switching scheme, the measurement error due to the increase of the reversing frequency was reduced to less than 1 ppm up to 10 kHz
This paper describes the new primary standard for the ac-dc current transfer at Inmetro, based on... more This paper describes the new primary standard for the ac-dc current transfer at Inmetro, based on PMJTCs and the new shunts manufactured by Fluke for rated currents from 10 mA up to 20 A. The build-up of the ac-dc current scale is described together with the uncertainty budgets which result in final uncertainties at 5 A of 6 μA/A to 12 μA/A in the frequency range from 10 Hz to 100 kHz. These are small compared to international standards.
A primary standard of ac current at low frequency is derived from the standard of dc current by a... more A primary standard of ac current at low frequency is derived from the standard of dc current by ac-dc transfer instrument. A set of 15 thermal current converters(TCCs) have been constructed as the primary current standards from 5 mA to 20 A at the frequency range of 10 Hz to 100 kHz. It is evaluated that the uncertainties for the maintenance and dissemination of ac current standard are less than 52 ppm up to 20 mA and 20 kHz, 60 ppm up to 100 mA and 20 kHz, and rising to 200 ppm at higher currents and frequencies.
A new AC-DC voltage transfer system has been established at UME. The standards consist of a group... more A new AC-DC voltage transfer system has been established at UME. The standards consist of a group of planar multijunction thermal converters (PMJTC), whose basic level (1 V to 3 V) is calibrated in PTB. A new software developed at UME is used for step-up and down procedures in order to establish voltages from 2 mV to 1000 V in the frequency range from 10 Hz to 1 MHz.
IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188), 2000
Proceedings of 20th Biennial Conference on Precision Electromagnetic Measurements, 2000
The improved design of the fast reversed DC source allows the measurement of thermoelectric effec... more The improved design of the fast reversed DC source allows the measurement of thermoelectric effects in thermal converters of all designs and serves as a basic tool to control reference standards for ac-dc transfer. Residual effects in thermal converters are measured which are explained by nonuniformities in the heater material
Proceedings of Conference on Precision Electromagnetic Measurements Digest, 2000
A fast-reversed-dc current source has been developed for the purpose of evaluating the ac-dc tran... more A fast-reversed-dc current source has been developed for the purpose of evaluating the ac-dc transfer differences due to thermoelectric effect of thermal converters. By use of a novel switching scheme, the measurement error due to the increase of the reversing frequency was reduced to less than 1 ppm up to 10 kHz
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Papers by Manfred Klonz