§  2.1505   Test instrumentation and equipment.

   (a) Receiver (field intensity meter). A calibrated field intensity
   meter (FIM) with a frequency range of 30 to 1000 MHz is required for
   measuring radiated emission levels. This instrument should be capable
   of making peak measurements with a bandwidth of 100 kHz.

   (b) Spectrum analyzer. Spectral measurements are to be made with a
   spectrum analyzer with a minimum resolution bandwidth no greater than
   10 Hz. The video filter, if used, should have a bandwidth wide enough
   so as to not affect peak readings. A linear video output is desirable
   for performing measurements of modulation characteristics.

   (c) Storage oscilloscope. Measurements of modulation characteristics
   are to be made using a calibrated storage oscilloscope. This instrument
   is to be DC coupled and capable of manually triggered single sweeps.

   (d) Frequency counter. A frequency counter with an accuracy of at least
   5 parts per million is required for measuring the carrier frequency.

   (e) Signal generator. A calibrated signal generator with an output of
   at least 75 mW at 121.5 and 243 MHz is required for generating a
   reference signal for site calibration.

   (f) Antenna. Radiated emissions are to be measured with calibrated,
   tuned, half-wave dipole antennas covering the frequency range of 30 to
   1000 MHz.

   (g) Temperature chamber. Tests which call for subjecting the EPIRB to
   temperature levels other than the ambient temperature are to be
   performed in a temperature test chamber which can be adjusted to stable
   temperatures from −20 to +55 °C. This chamber is to be of sufficient
   size to accommodate the EPIRB under test.

   (h) Vibration table. A vibration table capable of vibrating the EPIRB
   with a sinusoidal motion is required. The table must be capable of
   varying the frequency of vibration either linearly or logarithmically
   over a range of 4 to 33 Hz with maximum peak amplitudes of up to 2.5
   mm.

   (i) Salt fog chamber. A chamber capable of producing salt fog at a
   temperature of 35 °C for 48 hours is required. This chamber is to be of
   sufficient size to accommodate the EPIRB under test.

   (j) Drop test facility. A facility which will permit dropping an EPIRB
   from a height of 20 m into water is required. The water must be deep
   enough so that the EPIRB will not touch bottom when dropped.

Environmental and Operational Test Procedures