HP Cable Box 8591C User Manual

Page of 550
I
 
 
 
It is often necessary to measure a signal response’s bandwidth, such as when
testing a band-pass 
 The signal to be measured must be centered on the
display with a span that includes the full response. Activate the measurement
by turning the N 
 PTS 
 OFF key (ON). The spectrum analyzer places
arrow markers at the -3 
 points on either side of the response and reads
the bandwidth. For other bandwidth responses enter the number of 
 down
desired, from 1 
 to 80 
No other signal can appear on the display within N 
 of the highest signal.
The measured signal cannot have more than one peak that is greater than or
equal to N 
 A signal must have a peak greater than the peak excursion to
be identified. The default value for the peak excursion is 6 
The N 
 bandwidth measurement error is typically:
about 
 % of the span, for spans   10 MHz
about 
 % of the span, for spans   10 MHz
 
 
 
   
 
 
 
 
 
 
 
 
 
 
Figure 
 N   Bandwidth Measurement
5-60