Patents Assigned to Sencore, Inc.
  • Method and apparatus for aligning traps in a television receiver
    Patent number: 4562469
    Abstract: A video carrier, which is amplitude modulated with a fixed video pattern signal, and sync and blanking signals, is combined with an amplitude modulated I.F. trap frequency signal and supplied to the input of the I.F. stages of a television receiver to cause the video pattern to be displayed on the screen of the receiver, which pattern will exhibit interference until the I.F. trap corresponding to the applied I.F. frequency is set precisely at the applied I.F. frequency.
    Type: Grant
    Filed: July 11, 1983
    Date of Patent: December 31, 1985
    Assignee: Sencore, Inc.
    Inventor: Timothy J. Graham
  • Input protection circuit for electronic instrument
    Patent number: 4473857
    Abstract: A protection circuit for an electronic AC/DC instrument employs an input resistor connected across the DC input terminals of the instrument in series with the inner terminal of a coaxial cable connected to a resistance input probe, the inner cable being connected to the AC input terminals by means of a capacitor.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: September 25, 1984
    Assignee: Sencore, Inc.
    Inventor: Robert A. Winter
  • Method and apparatus for measuring leakage to ground
    Patent number: 4352058
    Abstract: Leakage current to ground from accessible locations on single phase electrical equipment is measured by powering the equipment through an isolation transformer and measuring the current flowing between the two power input terminals of the equipment under test via accessible locations on the equipment.
    Type: Grant
    Filed: February 1, 1980
    Date of Patent: September 28, 1982
    Assignee: Sencore, Inc.
    Inventor: Marlin D. Westra
  • Ohm meter with automatic lead resistance compensation
    Patent number: 4323972
    Abstract: An ohmmeter includes a memory section, which stores the resistance value of the associated leads, and a function section, which algebraically subtracts the said value from subsequent resistance measurements, so that the actual resistance of the circuit under test is displayed.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: April 6, 1982
    Assignee: Sencore, Inc.
    Inventor: Robert A. Winter
  • Inductance meter
    Patent number: 4258315
    Abstract: A direct reading inductance meter applies linearly increasing ramp current pulses to a coil under test and compares the voltage developed across the coil during occurrence of the pulses with the voltage developed across the coil while a steady state current is applied to the coil thereby to provide an output voltage having a value directly related to the inductance of the coil.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: March 24, 1981
    Assignee: Sencore, Inc.
    Inventor: Marlin D. Westra
  • Method and instrument for measuring the sensitivity of a radio receiver
    Patent number: 4160211
    Abstract: An RF carrier applied to the antenna input of a radio receiver under test is sequentially modulated with an audio signal to provide sequentially at the audio output of the receiver a signal plus noise signal and a noise signal, which audio output signals are compared to provide a ratio voltage which is displayed to permit adjustment of the level of the RF carrier to set said ratio at a predetermined value.
    Type: Grant
    Filed: September 8, 1977
    Date of Patent: July 3, 1979
    Assignee: Sencore, Inc.
    Inventor: Glen R. Wittrock
  • Channel frequency analyser
    Patent number: 4128808
    Abstract: The percentage deviation of citizen band transmitter channel frequencies from the standard channel frequencies is determined by counting the difference between the number of cycles in the transmitted and standard frequencies during a period of 0.37 second, the number counted being mathematically related to the percentage deviation by the same factor for all channel frequencies.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: December 5, 1978
    Assignee: Sencore, Inc.
    Inventor: Marlin D. Westra
  • Circuit for detecting ghosts in TV antenna systems
    Patent number: 4096529
    Abstract: The presence of ghosts or other similar interference in a television signal is detected and indicated by comparing the peak voltage levels of the horizontal blanking pulses on opposite sides of the horizontal synchronizing pulses in the television signal.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: June 20, 1978
    Assignee: Sencore, Inc.
    Inventors: Robert E. Baum, Robert A. Winter
  • Display circuit for battery powered digital meter
    Patent number: 3990008
    Abstract: A digital meter incorporates a circuit which senses the input voltage and automatically energizes a digital readout device only if the input voltage is greater than a predetermined absolute value.
    Type: Grant
    Filed: March 12, 1975
    Date of Patent: November 2, 1976
    Assignee: Sencore, Inc.
    Inventor: Marlin D. Westra
  • Method and apparatus for testing television yokes and flyback windings
    Patent number: 3990002
    Abstract: A plurality of capacitors are successively connected across a coil while a train of driving pulses is applied thereto to cause the coil to ring after each driving pulse, and the number of cycles which occur in the ringing signal between two voltage levels thereof are counted to indicate if the coil is defective.
    Type: Grant
    Filed: May 7, 1975
    Date of Patent: November 2, 1976
    Assignee: Sencore, Inc.
    Inventor: Robert E. Baum