To provide a ground resistance meter that suppresses the influence of noise under a measuring environment, is not affected by the temperature during measurement, and accurately and stably measures ground resistance.
A measurement signal of a frequency corresponding to the clock from a microcomputer 11 is sent to ground electrode E-current auxiliary electrode C. Measurement current I acquired via an output current detecting circuit 15 and a differential arithmetic apparatus 14 is converted into a digital value by an A/D converter 15 for current measurement, and is supplied to a microcomputer 11. Potential difference between a potential auxiliary electrode P and a ground electrode E is converted into a digital value by an A/D converter 17 for voltage measurement. The measurement voltage signal is decomposed into signal intensities for respective frequencies by fast Fourier transformation processing function of a DSP 18, measurement voltage V selected from the frequency of the injected measurement signal is supplied to the microcomputer 11. The ground resistance Rx is determined by the microcomputer 11 and is displayed on an LCD indicator 11a.
YAMAJI TAKAYORI
KO RIKIUN
RYU SHINKA
| JPH08146058A | 1996-06-07 | |||
| JP2006133097A | 2006-05-25 | |||
| JPH03209177A | 1991-09-12 | |||
| JPH08285903A | 1996-11-01 | |||
| JPH095370A | 1997-01-10 |
Shinichi Fukuda
Takemichi Fukuda
Kyosuke Kato