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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–

------------------------------

⎝⎠

⎛⎞

–