Test set for measuring magnetic properties of magnetic amplifier cores by sinusoidal current excitation

Claim 2

A test set for measuring magnetic properties of magnetic amplifier cores, comprising, means for receiving a magnetic amplifier core for test, including a primary winding for applying a sinusoidal drive signal to produce a magnetic field in said core, and a secondary winding for sensing an output signal indicative of the magnetic flux produced in said core in response to said drive signal, and means for producing a repetitive constant current sinusoidal drive signal coupled to said primary winding for providing said applied sinusoidal drive signal, wherein the improvement comprises, means for causing said sinusoidal drive signal to be repeated at a low duty cycle rate of not more than one full sine wave in one hundred sine waves.

Claim 3

A test set according to claim 1 comprising means for varying the frequency of said drive signal over a range between 400 Hz and 30 Kilohertz.

Claim 4

A test set according to claim 2, wherein the primary winding has not more than the equivalent of two turns and the secondary winding has not more than the equivalent of two turns.

Claim 5

A test set according to claim 1 comprising means for varying the frequency of said drive signal.

Claim 6

A test set according to claim 4, wherein said duty cycle is not more than one-half sine wave in one hundred sine waves.

Claim 7

A test set according to claim 1, comprising means for providing a reading of the drive signal in units of magnetomotive force.

Claim 8

A test set according to claim 6, comprising means for providing a reading of said output signal in units of magnetic flux.

Claim 9

A test set according to claim 7, further comprising, display means coupled to said means for producing said drive signal and to said secondary winding for providing display of a hysteresis loop for said core in response to said drive signal and said output signal.

Claim 10

A test unit according to claim 1, comprising means for providing a reading of said output signal in units of magnetic flux.

Claim 11

A test set according to claim 1 wherein the core receiving means comprises, a table for receiving said test core, and including portions of the primary and secondary windings, with portions of both of the windings rigidly extending upward from the table, a cover including portions of the primary and secondary windings with portions of both of the windings rigidly extending downward from the cover in positions to mate with corresponding portions of the respective windings extending upward from the table, and guide rods coupling the cover with the table, the cover being movable on the rods for enabling the corresponding extending portions of the primary and secondary windings to be mated together to complete the primary and secondary windings when the cover is moved toward the table, and for enabling the corresponding extending portions of the primary and secondary windings to be separated so that said test core can be placed within the windings when the cover is moved away from the table.

Claim 12

A test set according to claim 10, wherein the primary winding has not more than the equivalent of two turns and the secondary winding has not more than the equivalent of two turns.

Claim 13

A test set according to claim 11, comprising means for varying the frequency of said drive signal over a range between 400 and 30 kilohertz.

Claim 14

A test set according to claim 1, wherein the primary winding has not more than the equivalent of two turns and the secondary winding has not more than the equivalent of two turns.