摘要:
PROBLEM TO BE SOLVED: To measure DC bias-capacitance characteristics by shortening the inspection time necessary per capacitor without need for a dedicated inspecting instrument. SOLUTION: A measuring apparatus 1 includes: an element connection 4, a limiting resistor 3, a DC bias source 2, a current measuring instrument 5, and an arithmetic part 6. The element connection 4 is connected with a ceramic capacitor 50. The limiting resistor 3 is a known resistance and connected to the ceramic capacitor 50 in series. The DC bias source 2 applies a known DC voltage to a serial circuit 7 composed of the limiting resistor 3 and the ceramic capacitor 50. A current measuring instrument 5 measures a current instantaneous value of the serial circuit 7. The arithmetic part 6 acquires a current instantaneous value at known time intervals, derives a capacitance instantaneous value of the ceramic capacitor 50 based on the current instantaneous value as well as a voltage instantaneous value applied to the ceramic capacitor 50 based on a DC voltage, a resistance value and the current instantaneous value, and determines a capacitance value of an element to be measured corresponding to the DC voltage value from the voltage instantaneous value and the capacitance instantaneous value. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a contact part measuring device for coaxial connector which can precisely measure electric properties only of a contact part between a pair of inner conductor terminals for constituting a pair of coaxial connectors. SOLUTION: One-end parts of a pair of measurement inner conductors 21, 22 are provided in the same shapes as the end parts at contact part sides of a pair of inner conductor terminals as products. A measurement tube part 3 includes: a tubular dielectric 31 into which the pair of measurement inner conductors 21, 22 in a contact state with the one-end parts in contact with each other are inserted; and a tubular outer conductor 32 covering the dielectric 31. A first coaxial connector part 4 and a second coaxial connector part 5 are provided at both end sides of the measurement tube part 3, and electrically connected to the other-end parts of the pair of measurement inner conductors 21, 22. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a frequency variable right angle phase bridge capable of calibrating a standard capacitor at a calibration frequency of 1.592 kHz with AC quantum hole effect resistance (acQHR) as a reference. SOLUTION: The frequency variable right angle phase bridge is constituted so that voltage dividing ratios ρ 1 , ρ 2 , ρ 3 , and ρ 4 of a frequency variable right angle phase bridge circuit are independently adjusted to satisfy a condition of balance represented by an expression 14. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring dielectric constants capable of accurately measuring a dielectric constant of a dielectric at wide frequencies. SOLUTION: A measurement sample 1 includes both of a dielectric sample 11 and a conductor plate 12 arranged in principal surfaces 13 and 14 of the dielectric sample 11. The measurement sample 1 has the function as a filter. The conductor plate 12 makes it possible to change a frequency at which a dielectric constant takes a minimum value. A spectrum analyzer 4 scans the frequency of planar waves irradiated from a transmitting antenna 2 to the measurement sample 1. A receiving antenna 3 and the spectrum analyzer 4 measure the field strength of planar waves transmitted through the measurement sample 1. A computer 5 uses parameters inputted to the computer 5 and measurement results of the spectrum analyzer 4 to compute a dielectric constant of the dielectric sample 11 by numerical computations according to an FDTD method. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To simply measure the dielectric constant of a liquid in a simple manner, and to improve the measurement accuracy. SOLUTION: An apparatus for measuring the dielectric constant of a liquid includes a storage space 11, where the liquid is inserted into a conductive container 1, and the container serves as the first electrode. The opening 11a of the storage space 11 is sealed with a lid 2, having a core wire 25 serving as the second electrode that protrudes. During the measurement, a measurement system is calibrated by an open-type, short-circuited and loaded calibration lids 41, 42 and 43 in a shape which is similar to that of the lid 2. In addition, a fringe capacitance regarded as a measurement error is measured, in advance, by means of the calibration lid 41, and the accuracy in measuring the dielectric constant is improved by subtracting the error due to the fringe capacitance from the actual measurement result. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a ground capacitance measuring method of a 6.6 kV non-grounded system for generating a secondary side three-phase unbalance voltage in an open delta connection of a grounded transformer by a simple facility dispensing with heat countermeasure, and measuring a ground capacitance of the 6.6 kV non-grounded system based on the secondary side three-phase unbalance voltage. SOLUTION: This method has a secondary side voltage generation measuring step S1. The secondary side voltage generation measuring step S1 is a step for generating the secondary side three-phase unbalance voltage V 02 in the open delta connection 52 on the secondary side, by changing at least a one-phase winding turn ratio of the grounded transformer 5 connected to buses 3a, 3b, 3c of the 6.6 kV non-grounded system 1. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a parasitic component measuring device and a parasitic component measuring method capable of improving test accuracy of a high-frequency device or a high-frequency IC, and suppressing complication of an inspection system. SOLUTION: A capacity value of a variable virtual capacitance is adjusted so that a Smith chart of a circuit to be measured formed by connecting to a transmission line, an inductor to be measured having a known inductance value agrees with a Smith chart of a virtual equivalent circuit including a same-value virtual inductor having the same inductance value as the inductor to be measured, and the variable virtual capacitance connected to the same-value virtual inductor, capable of adjusting a capacity value. The capacity value of the variable virtual capacitance when the Smith chart of the circuit to be measured agrees with the Smith chart of the virtual equivalent circuit is calculated as a capacity value of a parasitic capacitance of the transmission line, to thereby measure the parasitic capacitance of the transmission line. COPYRIGHT: (C)2011,JPO&INPIT