| 摘要 |
PCT No. PCT/GB89/00230 Sec. 371 Date Dec. 22, 1989 Sec. 102(e) Date Dec. 22, 1989 PCT Filed Mar. 8, 1989 PCT Pub. No. WO89/08838 PCT Pub. Date Sep. 21, 1989.Apparatus for measuring the electrical impedance of low conductivity samples, and particularly microbial suspensions, has a coil surrounding a tubular sample container. A capacitive pick-up on the sample wall provides an input to a variable gain amplifier driving the coil. The resident frequency of the circuit is measured to provide an indication of sample conductivity. |
