Example 5: Offset Causes Bad Source Stop Frequency - Agilent Technologies PSA Series User Manual
Option 215 for the psa series of spectrum analyzers
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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
Example 5: Offset Causes Bad Source Stop Frequency
Using PSA (13.2 GHz and above) and a 6 GHz source (for example, an
E4438C):
PSA settings:
• Start Freq = 10 GHz
• Stop Freq = 12 GHz
• Sweep Points = 101
• Offset = − 5 GHz, On
• Harmonic = OFF
This will cause the "Freq range of ext src exceeded" error.
Reason:
The signal source is being asked to sweep outside its frequency range.
In this case:
Source Start Freq
=
Chapter 5
3.0E 9 ( ) 2.5E 9 ( )
⎛
– (
2.8E 9 ( )
)
-------------------------------------------- -
+
–
⎝
1
3.0E 9 ( ) 2.5E 9 ( )
⎛
– (
2.8E 9 ( )
)
-------------------------------------------- -
+
+
⎝
1
12E 9 ( ) 10E 9 ( )
⎛
10E 9 ( )
– (
5E 9 ( )
)
----------------------------------------- -
+
–
⎝
----------------------------------------------------------------------------------------------------- -
1
FAQs and Helpful Hints and Tips
–
⎞
⎠
101 1
–
0.8E 9 ( ) = –0.8 GHz
=
–
⎞
–
⎠
101 1
–
0.2E 9 ( ) = 200 MHz
=
⎞
–
⎠
101 1
–
4.98E 9 ( ) = 4.98 GHz
=
Hints and Tips
71
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