
Frequency Parameter Considerations
• If the Carrier Frequency defined for the measurement is incorrect, the
Computed Output calculations may be in error. Verify that the Carrier
Frequency displayed on the Result Graph is the correct frequency.
When computing Sigma of Tau from a Result File you must ensure that
the Carrier Frequency in the Instrument Parameter display represents
the carrier frequency of the Result File.
Also,
when using an HP 11729C under system control, an incorrect
Carrier Frequency entry can result in an incorrect filter selection.
Detector Selection
The Select Detect, softkey provides selection between the HP 11848A
Phase Detectors. Verify that the selected Phase Detector is:
• Within the frequency range of the Detector/Discr. Input Frequency
entered.
• Installed in the HP 11848A Phase Noise Interface. (Option 201 adds
the 1.2 to 18 GHz Phase Detector to the HP 11848A).
Detector Selection
Internal
5 MHz to 1.6 GHz
Internal
1.2 GHz to 18 GHz
External
Required Level (dBm)
LPort
+15 to +23
+7 to+10
As required for
the detector used
RPort
0 to +23
0to+10
As required for
the detector used
rev.05SEP89
Instr. Params: $N w/o PLL 2-33
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