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
1 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 you set is smaller than its recommended value, the
recommended start frequency prevails.
⚫
If the start frequency you set is greater than its recommended 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
1 MHz
100 kHz
1 MHz
3 kHz
2 MHz
100 kHz
2 MHz
10 kHz
5 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 greater than the recommended.
⚫
If the start frequency is set too small, the test accuracy will be affected.
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