R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
A.3 Glossary
A-10
Figure A-2 Bandwidth Switching Uncertainty
Frequency Response
This term represents amplitude characteristics (frequency characteristics) for a given frequency. In the spec-
trum analyzer, frequency response means the frequency characteristics (flatness) of the input attenuator and
mixer for the input frequency, and is given in ±
∆
dB.
Gain Compression
If the input signal is greater than a certain value, the correct value is not displayed on the screen, and the input
signal appears as if it were compressed. This phenomenon is called gain compression, and it reflects an error
in the linearity of the input signal range. Normally, the gain compression for a spectrum analyzer is specified
as the input signal level that produces a 1 dB error from a perfect linear response.
IF Gain Uncertainty
The uppermost scale on the screen is the reference used to read the absolute level of an input signal on the
spectrum analyzer. The level set for this uppermost scale is referred to as the reference level.
The reference level is set using the REF LEVEL key and displayed in dBm or dB
µ
. The absolute accuracy
of this display is determined by the IF gain uncertainty assuming the input attenuator is at a constant level.
Figure A-3 IF Gain Uncertainty
Maximum Input Level
This is the maximum level allowed for the input circuit of the spectrum analyzer. The level can be modified
by the input attenuator.
1dB
Switching error
