Example 4: Offset Causes Invalid Source Setting - Agilent Technologies PSA Series Manual

Table 5-2

Example 4: Offset Causes Invalid Source Setting

Using any PSA and any source:
PSA settings:
• Start Freq = 2.5 GHz
• Stop Freq = 3.0 GHz
• Sweep Points = 101
• Offset = −2.8 GHz, On
• Harmonic = OFF
This will cause the "Freq range of ext src exceeded" error.
Reason:
The signal source cannot sweep from a negative frequency, but by
specifying a Start Frequency of 2.5 GHz and Offset of −2.8 GHz, you are
asking the source to start its sweep at −0.8 GHz. In this case:
2.5E 9 ( )
Source Start Freq
= -------------------------------------------------------------------------------------------------------------- -
3.0E 9 ( )
Source Stop Freq
= -------------------------------------------------------------------------------------------------------------- -
But −0.8 GHz is not in the range of the signal source.
So you can either:
• increase the offset to ≤ −3 GHz
or
• reduce the stop frequency to ≤ 2.8 GHz
Chapter 5
Frequency Bands in the PSA Series analyzers
(Microwave Preselector Off)
Band Frequency Range
Number
7 40.5 GHz - 50 GHz
3.0E 9 ( ) 2.5E 9 ( )
⎛
– ( 2.8E 9 ( ) )
-------------------------------------------- -
+ –
⎝
101 1
1
3.0E 9 ( ) 2.5E 9 ( )
⎛
– ( 2.8E 9 ( ) )
-------------------------------------------- -
+ +
⎝
1
FAQs and Helpful Hints and Tips
Overlap
with Next
Band
N/A
⎞
–
⎠
–
0.8E 9 ( ) = –0.8 GHz
= –
⎞
–
⎠
101 1
–
0.2E 9 ( ) = 200 MHz
=
Hints and Tips
73