Rigol RSA Series - Page 23

Chapter 2 Functions of the Front Panel RIGOL
VNA User Guide 2-3
Start Freq
Sets the start frequency of the current frequency channel.
Remarks:
When you modify the start frequency, the span and center frequency will be
changed.
Table 2-2 Start Frequency
Parameter
Remarks
Default
10 MHz
Range
100 kHz to (Fmax – 10 Hz)
Unit
GHz, MHz, kHz, Hz
Knob Step
step = span/200, Min = 1 Hz
Left/Right Arrow Key Step
Up/Down Arrow Key Step
CF step
The recommended value for the start frequency is determined by IF BW. When you
select a value for IF BW, the system will automatically test the start frequency.
⚫ If the start frequency detected is smaller than the recommended start frequency
value, the recommended start frequency prevails.
⚫ If the start frequency detected is greater than the recommended start frequency
value, the system will take your current setting as the start frequency.
The following table shows the relationship between the recommended value and the
IF BW for different measurement items.
Table 2-3 Relationship between Recommended Start Frequency and IF BW
IF BW
S11 Start Freq
S21 Start Freq
DTF Start Freq
1 kHz
10 MHz
100 kHz
1 MHz
3 kHz
10 MHz
100 kHz
2 MHz
10 kHz
10 MHz
100 kHz
5 MHz
30 kHz
10 MHz
100 kHz
10 MHz
100 kHz
20 MHz
100 kHz
20 MHz
300 kHz
50 MHz
100 kHz
50 MHz
1 MHz
70 MHz
300 kHz
70 MHz
3 MHz
100 MHz
1 MHz
100 MHz
10 MHz
200 MHz
2 MHz
200 MHz
Remarks:
⚫ You can manually set the start frequency to be smaller than the recommended.
⚫ If the start frequency is set too small, the test accuracy will be affected.