Calibrator Exciter; Model: C31

Title

Calibrator Exciter; Model: C31

Subject

Geophysics; Soil Science; Geo-Mechanics

Description

Physical Description

The two Calibration Exciters are mounted to a sturdy cement wall by 4 steel screws at each corner of the base. The base is comprised of a non-magnetic metal alloy that has a square plate flush against the wall and two perpendicular plates which the driver coil sits between. The field coil casing is made from the same non-magnetic material and contains loops of copper coil which are partially exposed on the front side by 4 holes in the casing. The field coil is connected to the driver coil by a magnesium rod. The two coils are held in place by a large, non-magnetic, metal alloy, vertical clamp that that is positioned against the front side of the driver coil and the rear side of the field coil. The field coil has a receptacle with four pin holes: two for AC current, and 2 for DC current. The driver coil is connected to a steel connector, which must be at least 3” long which then connects to the desired test equipment or vibration table. The current is measured in the coils by a connected ammeter.

Functional Description

The main use of the Calibration Excitor is to calibrate vibration pickups, and displacement of acceleration by directly attaching to the vibration table and applying a frequency. The field coil is supplied a DC voltage which creates a steady magnetic field around it. The driver coil is within the magnetic field, and the driver coil is supplied an AC current with adjustable frequency and amplitude. The frequency created by the driver coil is used for calibration and to generate force to be applied to the vibration table and testing equipment and used to find the resonant frequency of the tested

Date

1946

Format

physical object

Language

English

Identifier

UNITED STATES PROPERTY | U.S. 2322 | UNIVERSITY OF FLORIDA
PROPERTY OF | UNIVERSITY OF MICHIGAN | 541815

Coverage

USA

Physical Dimensions

Width of Field Coil casing: 7cm
Diameter of Field Coil casing: 26cm
Diameter of Driver Coil casing: 14cm

Materials

Metal alloy(non-magnetic), copper coil, steel, magnesium

Maker

The MB Manufacturing Company Inc., New Haven, CT

Inscriptions

UNITED STATES PROPERTY | U.S. 2322 | UNIVERSITY OF FLORIDA
PROPERTY OF | UNIVERSITY OF MICHIGAN | 541815
No 1 c-31 (marked on the left one)
No 2 c-31 (marked on the right one)
MB | VIBRATION TEST | EQUIPMENT | MODEL C31 | TYPE
SER. 333 | MB ELECTRONICS | A DIVISION OF TECTRON ELECTRONICS, INC. | NEW HAVEN, CONN. | PAT. APPLIED FOR

History of the Object

Originally from the University of Florida, the sold to the University of Michigan and then sold to Michigan Tech. Told by Stan Vitton.

Location

Dillman Bldg, Room B10 sub-basement

Bibliography

See also Vintage MB Manufacturing Company Inc. Vibration Computer 1954 Slide Rule USA [eBay]

Social Bookmarking

Collection

Citation

“Calibrator Exciter; Model: C31,” Michigan Tech Inventory of Historic Scientific Instruments, accessed April 13, 2021, https://ihsi.omeka.net/items/show/198.