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scale factor
The per-division calibration of the vertical axis of the display.
scan (frequency span) linearity
The measured accuracy of the horizontal axis of the analyzer display.
When two horizontal points are set with analyzer controls, then
measured, the linearity is the calculated error between the two points
compared with the analyzer settings.
selectivity
See bandwidth selectivity.
sensitivity
The level of the smallest sinusoid that can be observed on an analyzer,
usually under optimized conditions of minimum resolution bandwidth, 0
dB
input attenuation, and minimum video bandwidth. Hewlett-Packard
deEnes sensitivity as the displayed average noise level. A sinusoid at that
level appears to be about 2
dB
above the noise.
serial prefix
Serial numbers that identify an instrument begin with a five-character
prefix. The prefix in this case represents the version of firmware
that particular instrument was shipped with. For HP 70000 Modular
Measurement Systems, file numbers saved by the user in memory are
preceded with letters that define the
file
type. Refer to the HP 70000
system operation manual for detailed information.
shape factor
Refer to bandwidth selectivity.
signal resolution
The ability of the analyzer to resolve two separate input signals. Closely
spaced signals are more difficult to resolve than signals spaced far apart.
Refer also to resolution bandwidth and shape factor.
signal identification
A routine that identifies whether or not a particular Fourier transform
response on the analyzer’s display is at the correct frequency. The
displayed signal may be aliased by the FFT calculation because of
inadequate sample rate. The signal identiEcation routine indicates if the
signal is being displayed at the wrong frequency.
Glossary-23