| 摘要 |
<p>An improvement to the transducer activated resistivity meter, particularly a salinometer, described in FR 1,559,052, comprising a wheatstone bridge instrument operating on a very low voltage to hold down the current in the transducer and the standard resistance of the bridge, so that an amplifier is necessary between the bridge and a thermionic indicator valve; the amplifier now uses a pentode in which the control grid is held at an absolutely constant negative potential, regardless of current variations on the pentode. plate and screen grid. The continuous measurement of salt concn in brine is effected with greater accuracy.</p> |
