Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1976-02-13
1977-03-01
Woodiel, Donald O.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73194EM, G01F 164, G01F 2500
Patent
active
040096033
ABSTRACT:
Two embodiments of a zero speed calibrator for a known type of electro-magnetic underwater log are disclosed. In a presently preferred embodiment, switching means are provided to connect the excitation source of the log to the magnetic field-generating coil in the sensor unit during normal operation, but to disconnect the excitation source from the coil and substitute dummy loads across the excitation source and the coil, respectively, during zero calibration procedures without disturbing the voltage-sensing circuit. In another embodiment, a special cable segment is inserted in the connecting cable during zero calibration procedures. The special cable segment contains dummy loads constructed so that insertion of the special segment automatically connects the dummy loads across the source and coil, respectively, while still providing a direct connection in the voltage-sensing circuit.
REFERENCES:
patent: 3717031 (1973-02-01), Bisian
patent: 3805768 (1974-04-01), Barefoot et al.
patent: 3965738 (1976-06-01), Watanabe
Gorenstein Charles
Roehl Joseph M.
Sperry Rand Corporation
Terry Howard P.
Woodiel Donald O.
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