To reduce local magnetic disturbances, place the magnetometer in a box well separated from the power supply and pen recorder (the motor of the recorder could produce some nasty feedback).
It is a good idea to use your pen recorder while making tests.
The analog output can be used with data acquisition systems or pen recorders
. Suited for use in the field, the thermometer is dustproof, splash-proof and battery powered.
They are suited for mobile phones, digital cameras, FM radios, MP3, PDAs, an electronic dictionary and pen recorders
. They are available in diameters of 10 mm, 13 mm and 15 mm.
The two options for chart recording are thermal array printers and pen recorders. Putting out charts on a thermal array printer has a number of advantages: annotation can be flexible and automatic, grids can be scaled to engineering units and printed at the same time as the waveforms, and the number and widths of channels can be selected at run time.
"Doctors much prefer pen recorders," says Gould's Porter.