FCC 73.1215 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 73.1215 Specifications for indicating instruments.
The following requirements and specifications shall apply to indicating
instruments used by broadcast stations:
(a) Linear scale instruments:
(1) Length of scale shall not be less than 2.3 inches (5.8 cm).
(2) Accuracy shall be at least 2 percent of the full scale reading.
(3) The maximum rating of the meter shall be such that it does not read off
scale during modulation or normal operation.
(4) Scale shall have at least 40 divisions.
(5) Full scale reading shall not be greater than five times the minimum
normal indication.
(b) Instruments having square-law scales:
(1) Meet the requirements of paragraphs (a) (1), (2), and (3) of this
section for linear scale instruments.
(2) Full scale reading shall not be greater than three times the minimum
normal indication.
(3) No scale division above one-third full scale reading shall be greater
than one-thirtieth of the full scale reading. (Example: An ammeter meeting
requirement (1) having full scale reading of 6 amperes is acceptable for
reading currents from 2 to 6 amperes, provided no scale division between 2
and 6 amperes is greater than one-thirtieth of 6 amperes, 0.2 ampere.)
(c) Instruments having logarithmic scales:
(1) Meet the requirements of paragraphs (a) (1), (2), and (3) of this
section for linear scale instruments.
(2) Full scale reading shall not be greater than five times the minimum
normal indication.
(3) No scale division above one-fifth full scale reading (in watts) shall be
greater than one-thirtieth of the full scale reading. (Example: A wattmeter
meeting requirement (3) having full scale reading of 1,500 watts is
acceptable for reading power from 300 to 1,500 watts, provided no scale
division between 300 and 1,500 watts is greater than one-thirtieth of 1,500
watts or 50 watts.)
(d) Instruments having expanded scales:
(1) Shall meet the requirements of paragraphs (a) (1), (2), and (3) of this
section for linear scale instruments.
(2) Full scale reading shall not be greater than five times the minimum
normal indication.
(3) No scale division above one-fifth full scale reading shall be greater
than one-fiftieth of the full scale reading. (Example: An ammeter meeting
the requirement (1) is acceptable for indicating current from 1 to 5
amperes, provided no division between 1 and 5 amperes is greater than
one-fiftieth of 5 amperes, 0.1 ampere.)
(e) Digital meters, printers, or other numerical readout devices may be used
in addition to or in lieu of indicating instruments meeting the
specifications of paragraphs (a), (b), (c), and (d) of this section. The
readout of the device must include at least three digits and must indicate
the value of the parameter being read to an accuracy of 2%. The multiplier,
if any, to be applied to the reading of each parameter must be indicated at
the operating position.
(f) No instrument which has been broken or appears to be damaged or
defective, or the accuracy of which is questionable shall be used, until it
has been checked, and if necessary repaired and recalibrated by the
manufacturer or qualified instrument repair service. Repaired instruments
shall not be used unless a certificate of calibration has been provided
showing that the instrument conforms to the manufacturer's specifications
for accuracy.
[ 41 FR 36818 , Sept. 1, 1976; 41 FR 43152 , Sept. 30, 1976, as amended at 51 FR 2707 , Jan. 21, 1986]
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