So the PSA start frequency should be adjusted enough to ensure that it
is at least 1 bucket width greater than the source minimum frequency.
(Find the source minimum frequency using the PSA command
SOURce:EXTernal:FREQuency:STARt? MIN)
Example 2: Bad Source Stop Frequency
Using 50 GHz PSA (E4448A) and 44 GHz source (for example, an
E8267D):
PSA settings:
• Start Freq = 42 GHz
• Stop Freq = 44 GHz
• Sweep Points = 101
• Offset = OFF
• Harmonic = OFF
This will cause the "Freq range of ext src exceeded" error.
Reason:
The signal source must be able to sweep one "bucket's" worth of
frequency range after the requested PSA start frequency. In this case:
Source Start Freq
=
44E 9 ( )
Source Stop Freq
=
--------------------------------------------------------------------------------- -
But 44.02 GHz is not in the range of the signal source.
So the PSA stop frequency should be adjusted enough to ensure that it
is at least 1 bucket width less than the source maximum frequency.
(Find the source maximum frequency using the PSA command
SOURce:EXTernal:FREQuency:STOP? MAX)
Example 3: Outside Analyzer Frequency Band
Using any PSA and any source:
PSA settings:
• Start Freq = 2.5 GHz
• Stop Freq = 3.5 GHz
Chapter 5
44E 9 ( ) 42E 9 ( )
⎛
–
----------------------------------------- -
42E(9)
+
0
–
⎝
101 1
–
------------------------------------------------------------------------------- -
1
44E 9 ( ) 42E 9 ( )
⎛
–
----------------------------------------- -
+
0
+
⎝
101 1
–
1
FAQs and Helpful Hints and Tips
⎞
⎠
41.98E 9 ( ) = 41.98 GHz
=
⎞
⎠
44.02E 9 ( ) = 44.02 GHz
=
Hints and Tips
69