This standard provides performance requirements for analog,
sampled-data, and digital implementations of bandpass filters that
comprise a filter set or spectrum analyzer. The extent of the
passband region of a filter's relative attenuation characteristic
is a constant percentage of the midband frequency for all filters
of a given bandwidth. An instrument complying with the requirements
of this standard may contain any number of bandpass filters
covering any desired frequency range. Methods for testing the
performance of filters are given in an informative annex.
Performance requirements are provided for three filter classes
designated class 0, class 1, and class 2. Allowed tolerance limits
increase as the class number increases.
Bandpass filters conforming with the performance requirements of
this standard may be part of various measurement systems or may be
an integral component of a specific instrument and shall operate in
real time. Performance requirements apply to any method that is
selected by the manufacturer to implement the design of the
Instruments conforming with the requirements of this standard
are capable of provi ding frequencyband- filtered spectral
information for a wide variety of signals, for example,
time-varying, intermittent, and steady; broadband and discrete
frequency; and long and short durations. For applications involving
transient signals, different realizations of filters meeting the
requirements of this standard may give different results.