Goto Section: 73.1213 | 73.1216 | Table of Contents
FCC 73.1215
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 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]
Goto Section: 73.1213 | 73.1216
Goto Year: 2010 |
2012
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