Datasheet

9.11. Select Marker
Select marker to be used for the specific measuring, the default is Marker 1.
9.12. Noise Marker
Execute the Noise function for the selected marker and reads the Power Spetral Density.
Key points:
 If current marker under Marker menu is off, pressing this key will enable it to Normal type, and
then measure the average noise level at the marked point and nomarlize the value to 1Hz
bandwidth. During this process, the system compensates according to different detector modes
and trace types. With the mode of “RMS Avg” and “Sample”, the measurement will be more
accurate.
 If the Delta Function of marker is on, the noise marker will be enabled and moved to the floor
noise to be measured, in this case, the readouts shows the Sig./Noise ratio.
9.13. N dB BW
Enable the function of N dB bandwidth measurement or se the value of N dB. The N dB denotes the
frequency difference points that are located on both sides of the current marker while the amplitude
falls off (N<0) or rises (N>0) N dB sperately, see below figure 2-8:
Figure 2-8
Key points:
 After measurement starts, the analyzer first search the two points locate at boths sides of
current marker with amplitude difference N dB. If the points are searched, the frequency
difference between them will be shown in active area. Or else the sign “---” shows that the
search failed.
 You can modify N value by numeric keys, knob and arrow keys. For more details, please refer
to “Parameter Input”.
Table 2-22 N dB BW parameter settings
Function Off
Disable the function of Noise Marker and N dB BW, but not the markers.
-33-
Parameter
Description
Default
-3 dB
Range
-100 dB ~ 100 dB
Unit
dB
Knob Step
0.1 dB
Arrow Keys Step
1 dB