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

Hints and Tips
FAQs and Helpful 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.
PSA Start Freq
Source Start Freq
= --------------------------------------------------------------------------------------------------------------------------------------------------------------- -
PSA Stop Freq
Source Stop Freq
= --------------------------------------------------------------------------------------------------------------------------------------------------------------- -

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:
Source Start Freq
Source Stop Freq
But −5 MHz is not in the range of the signal source.
70
Offset Freq
+
Harmonic Number
Offset Freq
+
Harmonic Number
500E 6 ( ) 0
⎛
–
0 0
----------------------------- -
+ –
⎝
101 1
–
= ----------------------------------------------------- -
1
500E 6 ( ) 0
⎛
500E 6 ( )
0
----------------------------- -
+ +
⎝
101 1
= ------------------------------------------------------------------------
1
PSA Stop Freq PSA Start Freq
⎛
–
----------------------------------------------------------------------------- -
–
⎝
Sweep Points 1
PSA Stop Freq PSA Start Freq
⎛
–
----------------------------------------------------------------------------- -
+
⎝
Sweep Points 1
⎞
⎠
5E 6 ( ) = –5 MHz
= –
⎞
–
⎠
–
505E 6 ( ) = 5.05 MHz
=
⎞
⎠
–
⎞
⎠
–
Chapter 5