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INPUT ATTENUATION
To quickly see signals present in the span, press I::::'1
and 0 several times. When the sweep completes
its span, couple sweep time again with m
Note that the MEAS UNCAL message appears auto-
matically as the faster sweep time causes some distor-
tion of the spectral response.
INPUT ATTENUATION
The levels of attenuation that can be selected are 10 dB to 70 dB in 10 dB steps, or 0 dB under special conditions.
Generally, the reference level does not change with attenuator settings.
When the RF input attenuator function is coupled (AUTO), the value selected assures that the level at the input
mixer is less than - 10 dBm (the 1 dB compression point) for on-screen signals. For example, if the reference level
is + 28 dBm, the input attenuator will be set to 40 dB:
The input mixer level can be changed to assure maximum dynamic range. See EFFECTIVE MIXER LEVEL,
Chapter 11.
Greater than + 30 dBm total input power will damage the input attenuator and the
input mixer.
74 Manual Operation
I aam .Y M.
+ 28 dBm - 40 dB = - 12 dBm at the mixer.
CAUTION
C O U P L E D F U N C T I O N
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