3Space Isotrak II
The 3Space Isotrak II is an electromagnetic tracking system from Polhemus.[1]
The system is made of an SEU, a transmitter, 1 or 2 sensors, and a power adapter.
It is compatible with Windows 95/98/NT, or anything with an RS-232 port.
It was available about the same time as the Polhemus Fastrak. The Polhemus Isotrak II is a lower cost tracking system with slightly reduced performance from Fastrak. One of these receivers can be the Polhemus 3Ball, a 3D positioning/orientation input device that incorporates hand and body motion into a mouse. This optional receiver costs $800 in addition to $2,875 for the basic Isotrak II.[2]
In a study of lag and frame rates of virtual environment systems, the device lag for the Isotrak II was found to be about 45ms.[2]
The Isotrack II transmitter operates at 8013 Hz.[3]