Cassette Replacement  (330-2001)    Specifications     Faxback Doc. # 15323
Mike

This standard describes the requirements for a dynamic microphone type,
handheld, for use in tape recorder.

ELECTRICAL REQUIREMENTS

Impedance:.........................................500 Ohms +/- 30% at 1KHz
Directivity:...............................................Omni-Directional
Sensitivity:..........................-78 +/- 3dB at 1KHz (odB=1V/microbar)
Frequency Response:.............................................100Hz-10KHz

MECHANICAL REQUIREMENTS

Durability of Switch:..................Normal after 10,000 cycles operation
Cord Strain Relief:......................Normal after supplied 5kg force at
                                         both end of mic or plug for 1 sec.
Drop Test:.......................Normal after free fall from 1 meter height
                                     to concrete floor each one for 5 times
Vibration Test:...................Normal after vibrations, 12Hz to 55Hz for
                                  1 minute full amplitude 2mm for 1.5 hours
                                                            at three axises
Temperature Cycle Test:...............After exposure at -10 degrees C for 1
                                       hour, at 25 degrees C for 1 hour, at
                                         55 degrees C for 1 hour, 2 cycles,
                                     frequency response, sensitivity should
                                                  be within specifications.
Humidity Test:....................After exposure at 40 degrees C and 90-95%
                               RH relative humidity for 48 hours, frequency
                                     response, sensitivity should be within
                                                             specifications
                                    (The measurement should be done after 2
                                     hours of conditioning at 25 degrees C)
Operating Temperature:........................-10 degrees C to 55 degrees C


(ALL-05/18/95)