Abstract: A magnetic field measuring apparatus for measuring a to-be-measured magnetic field includes a magnetic impedance element with an impedance change rate that changes depending on the to-be-measured magnetic field, a drive signal providing section and a measurement range setting section. The drive signal providing section provides a drive signal to the magnetic impedance element. A measurement range setting section sets a measurement range in which the to-be-measured magnetic field can be measured. A relationship between the to-be-measured magnetic field and the impedance change rate is arranged to change depending on a frequency of the drive signal. The measurement range setting section is arranged to set the measurement range by setting the frequency.

Abstract: A controller (4) for controlling a printer engine (7) used to print data on a medium determines an identification number based on received data, and prints the identification number together with print data based on the received data on the medium. Simultaneously, the controller (4) stores therein the identification number and the print data in an HD (6). With the construction, the identification number printed on the medium is inputted in the next and later printing operations. The controller (4) searches the HD (6) to retrieve and print the print data. Therefore, a copy of a quality as high as that of the original document can be produced.

Abstract: A controller (4) for controlling a printer engine (7) used to print data on a medium determines an identification number based on received data, and prints the identification number together with print data based on the received data on the medium. Simultaneously, the controller (4) stores therein the identification number and the print data in an HD (6). With the construction, the identification number printed on the medium is inputted in the next and later printing operations. The controller (4) searches the HD (6) to retrieve and print the print data. Therefore, a copy of a quality as high as that of the original document can be produced.