Calibration spheres

Kongsberg Maritime can supply a variety of copper and tungsten calibration spheres dedicated for different operational frequencies. Each sphere diameter is selected for minimum temperature dependence.

Frequencies (kHz)	Copper	Part number
18	63 mm	SRT-073512
38	60 mm	SRT-073514
70	32.1 mm	SRT-073517
120	23 mm	SRT-088098
200	13.7 mm	SRT-073519

Frequencies (kHz)	Tungsten carbide	Part number
38	38.1 mm	337897
70	38.1 mm	337897
120	38.1 mm	337897
200	38.1 mm	337897
333	22 mm	337511
-	25 mm	364507
Each tungsten carbide sphere must have a cobalt binder.

Note

Each calibration sphere must be handled with care to avoid any damage to its surface. When not in use, store the sphere in a household soap solution. All suspension lines must be as thin and clean as possible. Limit knots to a minimum, and keep them small. Even knots have strong echoes!