Temperature variations are another major issue with Hall instruments. An on-chip temperature measurement, combined with built-in correction tables obtained during the NMR calibration, guarantees accurate readings throughout the operational temperature range. And for AC field measurements, there is no need to worry about the effects of eddy currents, since the sensor chips are mounted on a ceramic wafer and plastic stem.
Standardized USB interface
Last but not least, with its standard USB interface, the Magnetic Endoscope can be connected either directly to a PC, or to a Personal Digital Assistant (PDA) for handheld use. With the comprehensive LabVIEW libraries included in the package, this opens up some interesting data processing possibilities… "But for those allergic to computer programming, we also offer a turnkey application so that the instrument can be used out-of-the-box", says Philip Keller reassuringly.
Another advantage of the USB interface: it greatly simplifies field mapping problems (see our article in e-letter 1). "A standard USB hub turns a handful of Magnetic Endoscopes into a high-speed probe array!" enthuses Philip Keller. ”By vastly reducing the complexity and cost of the mechanical fixture, such a solution allows rapid field mapping in applications where this was previously unimaginable.”
Hall technology: how it works
Download THM1176 (Very Preliminary) Data Sheet