SPA-900 Series User Manual 56
Figure 2-8 N dB BW
When the measurement starts, the analyzer will search for the two points which are located at
both sides of the current point with N dB fall or rise in amplitude and display the frequency
difference between the two points in the active function area. "----" would be displayed if the
search fails.
You can use the numeric keys, knob or direction keys to modify the value of N, for more
details please refer to “
Parameter Setting
”.
Table 2-29 N dB Noise
Parameter
Explanation
Default
-3dB
Range
-100dB ~ 100dB
Unit
dB
Knob Step
0.1dB
Direction Key Step
1dB
2.3.3.4
Freq Counter
Turn on or off the frequency counter.
The function is invalid when selecting marker 2, 3, 4.
If marker 1 is selected but no active, turning on the frequency counter will open marker 1
Normal marker automatically.
The frequency readout is more accurate when the frequency counter is enabled.
The frequency counter measures the frequency near the center frequency in Zero span mode.
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‐
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