Keys, typically labeled, and located on the front panel of an instrument. The key labels identify the function the key activities. Numeric keys and step keys are two examples of front- panel keys.
full span
A mode of operation in which the analyzer scans the entire frequency band of an analyzer.
function
The action or purpose which a specific item is intended to perform or serve. The analyzer contains functions that can be executed via
gain compression
The signal level at the input mixer of an analyzer where the displayed amplitude of the signal is a specific number of dB too low due just to mixer saturation. The signal level is generally specified for 1 dB or 0.5 dB compression and is usually between
gated measurement
See time-gate.
hard copy
Information or data printed onto paper as opposed to its being stored on disk or in the instrument’s memory.
harmonic distortion
Undesired frequency components added to signals as a result of nonlinear behavior of the device (for example, a mixer or an amplifier) through which signals pass. These unwanted components are harmonically related to the original signal.
harmonic mixing
The utilization of local oscillator harmonics generated in a mixer to extend the tuning range of an analyzer beyond the range achievable using just the local oscillator fundamental. The mathematical algorithm is:
F I N = FLO + FIF
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