Tektronix WCA200A, User Manual

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Glossary
Glossary- 2
WCA230A & WCA280A User Manual
Carrier-to-Noise Ratio (C/N)
The ratio of carrier signal power to average noise power in a given band-
width surrounding the carrier; usually expressed in decibels.
Center Frequency
That frequency which corresponds to the center of a frequency span,
expressed in hertz.
Clear (Erase)
Presets memory to a prescribed state, usually that denoting zero.
Controls
User-accessible mechanisms to modify setup parameters.
dBm
A unit of expressed power level in decibels referenced to 1 milliwatt.
dBmV
A unit to express voltage levels in decibels referenced to 1 millivolt.
dB
m
V
A unit to express voltage levels in decibels referenced to 1 microvolt.
Decibel (dB)
Ten times the logarithm of the ratio of one electrical power to another.
Depth of Modulation
The difference between the maximum and the minimum of the RF envelope
amplitude expressed as a percentage of the maximum RF envelope level.
Display Law
The mathematical law that defines the input-output function of the instru-
ment. The following cases apply:
Linear
A display in which the scale divisions are a linear function of the input
signal voltage.
Square Law (Power)
A display in which the scale divisions are a linear function of the input
signal power.
Logarithmic
A display in which the scale divisions are a logarithmic function of the input
signal voltage.
Display Line
A horizontal or vertical line on a waveform display, used as a reference for
visual (or automatic) comparison with a given level, time, or frequency.