Glossary of Terms C-2 Glossary
Site Master User Guide PN: 10580-00252 Rev. K C-11
LRM : Line Reflect Match (LRM) method of calibration developed by Anritsu.
In LRM, one of the lines of the LRL method is replaced with a match (or
load). For basic LRM, the match is assumed to be perfect, and thus
represents a line of infinite length. For cases where the load is well
understood, improvement in accuracy can be achieved by using ALRM
and incorporating the load model. So in some sense, this cal relates back
to the concept of the defined standards. Because only one line is
involved, this calibration can work down to DC and up to very high
frequencies (practically limited by the match
knowledge/characterization). Some variations allow one to trade one of
the match measurements for a pair of additional reflect measurements
(a second reflect standard is needed). Because of the requirement (in
this case) that the reflect standards be distinct, the calibration may
become band limited.
LST : Line Sweep tools (LST) is PC-based post-processing software that
efficiently manipulates line sweep and PIM traces for reporting
purposes.
MHz : Megahertz (MHz) - One MHz is equal to one†million†Hertz, and is a
measurement of frequency.
NF : Noise Figure (NF) is a measure of degradation of the signal-to-noise
ratio (SNR) that is caused by components in a radio frequency (RF)
device. The noise factor (F) of a system is defined as the signal-to-noise
ratio of the input power of the system divided by the signal-to-noise
ratio of the output power of that system. F (the noise figure) is defined
as the decibel value of the noise factor. NF = 10log (F) where log uses
the base 10, or common log. This formula is valid only then the input
termination is at standard noise temperature.
OBW : Occupied Bandwidth (OBW) is a measure of the bandwidth containing
99% of the total integrated power of the transmitted spectrum, centered
on the assigned channel frequency. Interference to other channels or to
other systems can occur if OBW is too large.
OSL : OSL or Open Short Load calibration method for coaxial line types.
Calibrations standards with known reflection coefficients are used to
calculate the correction factors. Refer to Calibration. Compare this with
SSL or Offset Short 1, Offset Short 2, Load calibration method for
waveguide line types.
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