This study examines the parasitic capacitance of the coaxial cable type RG-58/U by using the fixed 10 nF capacitor and the precision LCR meter with the test current 10, 30, 50, and 77 μA at frequencies from 100 Hz to 1 kHz, which belong the AC measurement range of quantum regime such as AC Quantum Hall resistance (QHR) as a reference impedance standard. The experiment is to measure the fixed capacitor with the coaxial cable with cable correction and without cable correction mode of the LCR meter. The parasitic capacitance can be obtained by calculating the capacitance difference between the case of cable correction and without cable correction and compared with the cable specification. The measurement results found that when the biased current increased, the capacitance at a frequency of 100 Hz in both cases increased while the capacitance values at 1 kHz frequency were stable. The capacitance value without cable correction case is higher values than the capacitance value from cable correction case. Comparing the capacitance difference value from both cases with the coaxial cable specification found the capacitance difference values at a frequency of 100 Hz is less than 374.04 pF, from the cable specification. The work can be used for the estimation of the capacitance compensation of the cable.

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Investigation of the Internal Parasitic Capacitance Cable in Low AC Measurement

  • Thamonwan Natteetong,
  • Jutarat Tanarom,
  • Ploybussara Gomasang

摘要

This study examines the parasitic capacitance of the coaxial cable type RG-58/U by using the fixed 10 nF capacitor and the precision LCR meter with the test current 10, 30, 50, and 77 μA at frequencies from 100 Hz to 1 kHz, which belong the AC measurement range of quantum regime such as AC Quantum Hall resistance (QHR) as a reference impedance standard. The experiment is to measure the fixed capacitor with the coaxial cable with cable correction and without cable correction mode of the LCR meter. The parasitic capacitance can be obtained by calculating the capacitance difference between the case of cable correction and without cable correction and compared with the cable specification. The measurement results found that when the biased current increased, the capacitance at a frequency of 100 Hz in both cases increased while the capacitance values at 1 kHz frequency were stable. The capacitance value without cable correction case is higher values than the capacitance value from cable correction case. Comparing the capacitance difference value from both cases with the coaxial cable specification found the capacitance difference values at a frequency of 100 Hz is less than 374.04 pF, from the cable specification. The work can be used for the estimation of the capacitance compensation of the cable.