Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 419)

Table 8-3. Reference Messages (3 of 7)

Remove the calibration spur. If the spur signal is not removed, it will appear in the

measurement and could affect the measurement results.

Action:

Disconnect or turn off the spur source without disturbing the frequency or

amplitude settings of the source.

NOTE

// you wish to determine the frequency and amplitude of you spur source,

leave the source connected and turned on during the measurement. The

spur signal should appear in your measurement results. Note, however, that

a large spur signal can prevent the system from having the full dynamic

range necessary to make a valid noise measurement.

Offset the source and reference signals by at least 1 Hz and not more than

20 MHz. The system requires that two different signals be applied to the input ports

of the HP 11848A's Phase Detector. The frequencies of the two sources must differ as

follows:

With RF Spectrum Analyzer in System Offset Range: 1 Hz to 20 MHz

Without RF Spectrum Analyzer in System Offset Range: 1 Hz to 50 kHz

Action:

Adjust the frequency of the device-under-test (DUT) to offset it from the

reference source frequency.

If the DUT cannot be adjusted to create a frequency offset that is within the offset

range specified above, substitute a different source for the DUT. Adjust the substitute

source for the same power level as the DUT source it is replacing. Terminate any ports

in 50O that are not connected during the substitution. Reconnect the DUT source after

the calibration is completed.

Remove the beatnote and connect the system for noise measurement.

Action:

Readjust the device-under-test (DUT) to the frequency of the reference source

or reconnect DUT.

Phase lock has been lost. This message can be caused by any one of the following

conditions.

Frequency drift > 25% of the Peak Tuning Range.

A phase transient > 0.25 radians.

3. Out-of-Lock detector set by search oscillator.

Reference Messages 8-23

1 2 ... 414 415 416 417 418 419 420 421 422 423 424 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 419