Instructions

T3VNA User Manual 49
Figure 2-11 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 dierence
between the two points in the active function area. "----" would be displayed if the search fails.
Table 2-30 N dB Noise
Parameter Explanation
Default -3 dB
Range -100 dB to +100 dB
Unit dB
Knob Step 0.1 dB
Direction Key Step 1 dB
2.3.3.4 Freq Counter
Turn on or off the frequency counter. The frequency readout is accurate to 0.01 Hz.
 The function is valid only when selecting marker 1.
 If marker 1 is selected but not active, turning on the frequency counter will activate marker 1
Normal marker automatically.
 The frequency counter measures the frequency near the center frequency in Zero span. If the RBW
is > 30KHz, the near center frequency is 30KHz. If the RBW is < 10KHz, the near center frequency
is 10KHz. The RBW sequence is 1-3-10.
2.3.3.5 O
Turn off the noise marker, N dB BW measurement or Frequency Counter, but not the marker itself.