R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
4.1 Input Saturation
4-2
To measure a continuous wave (CW), the attenuator is automatically set to an optimum value only when
the input peak value is set to a level below the reference level.
When measuring a signal with a wide modulation bandwidth (whose resolution bandwidth (RBW) is nar-
rower than the modulation bandwidth), the displayed input level becomes a value smaller than the mini-
mum level required for the measurement. If this happens, the input level must be set to an optimum value
manually.
•
How to check an optimum value
1.
To calculate a rough attenuator set value, use the formula shown below.
Input attenuator set value (dB)
≥
Input level (dBm) + 10 dB
2.
There is no input saturation if the peak value stays unchanged on the screen if the attenuation value
is decreased by 1. You can take measurements under these conditions. Otherwise, increase the at-
tenuation value until no changes in the peak value are observed on the screen.
