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HMR3000-D00-485 Datasheet(PDF) 5 Page - Honeywell Solid State Electronics Center |
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HMR3000-D00-485 Datasheet(HTML) 5 Page - Honeywell Solid State Electronics Center |
5 / 7 page HMR3000 www.honeywell.com 5 APPLICATIONS PRECAUTIONS Several precautions should be observed when using magnetic compasses in general: The presence of ferrous materials, such as nickel, iron, steel, and cobalt near the magnetometer will create disturbances in the earth’s magnetic field that will distort the X, Y, and Z field measurements. Perming effects on the HMR3000 circuit board need to be taken into account. If the HMR3000 is exposed to fields greater than 10 gauss, then it is recommended that the enclosure/circuit boards be degaussed for highest sensitivity and resolution. A possible result of perming is a high zero-field output indication that exceeds specification limits. Degaussing wands are readily available from local electronics tool suppliers and are inexpensive. Severe field offset values could result if not degaussed. NON-FERROUS MATERIALS Materials that do not affect surrounding magnetic fields are: copper, brass, gold, aluminum, some stainless steels, silver, tin, silicon, and most non-metals. HANDLING PRECAUTIONS The HMR3000 Digital Compass Module measures fields within 1 gauss in magnitude. Computer floppy disks (diskettes) store data with field strengths of approximately 10 gauss. This means that the HMR3000 is many times more sensitive than common floppy disks. Please treat the compass with at least the same caution as your diskettes by avoiding motors, CRT video monitors, and magnets. Even though the loss of performance is recoverable, these magnetic sources will interfere with measurements. The fluidic tilt sensor works best when kept near level, and in calm to moderate vibration conditions. If turned upside down or violently jarred, not all the fluid will immediately return to the bottom of the tilt sensor’s glass ampoule. Accurate tilt and tilt compensated headings may be unavailable for a minute or two to allow for the fluid to transit to the bottom of the ampoule. PCB DIMENSIONS AND PINOUT |
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