Agilent Technologies PSA Series - Band; Example 1: Bad Source Start Frequency

68 Chapter 5
Hints and Tips
FAQs and Helpful Hints and Tips
Hints and Tips
Examples Exceeding the Source Frequency Range or
the Spectrum Analyzer Frequency Band.
These examples will all result in an instrument error until the
measurement settings are changed.
The following reference information applies to all of the examples.
Example 1: Bad Source Start Frequency
Using any PSA and any source:
PSA settings:
• Start Freq = 0 Hz
• Stop Freq = 500 MHz
• 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 before the requested PSA start frequency. In this case:
But
−5 MHz is not in the range of the signal source.
Source Start Freq
PSA Start Freq Offset Freq+
PSA Stop Freq PSA Start Freq–
Sweep Points 1–
------------------------------------------------------------------------------
⎝⎠
⎛⎞
–
Harmonic Number
----------------------------------------------------------------------------------------------------------------------------------------------------------------=
Source Stop Freq
PSA Stop Freq Offset Freq+
PSA Stop Freq PSA Start Freq–
Sweep Points 1–
------------------------------------------------------------------------------
⎝⎠
⎛⎞
+
Harmonic Number
----------------------------------------------------------------------------------------------------------------------------------------------------------------=
Source Start Freq
00+
500E 6() 0–
101 1–
------------------------------
⎝⎠
⎛⎞
–
1
------------------------------------------------------5E6() = –5 MHz–==
Source Stop Freq
500E 6() 0+
500E 6() 0–
101 1–
------------------------------
⎝⎠
⎛⎞
+
1
------------------------------------------------------------------------ 5 0 5 E 6() = 5.05 MHz==