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Model 5344S
Operation and Programming
3-88.
Some plug-ins, such as those described in paragraph 3-70, combined several techniques
to generate signals over a wide range. The plug-in changes techniques at some frequency, for
example, above 2.4 GHz. If the 5344S is being used in Frequency Offset Mode and a frequency is
entered above the frequency where the Cavity Oscillator technique is used, the relationship
between the AUX OUT and the RF OUT will no longer be an offset, but instead could be equal or
a subharmonic. The offset entered into the counter is no longer needed. The offset will cause
tuning to be very difficult, if not impossible.
3-89.
Frequency Multiplier
3-90.
If a Frequency Multiplier of "1" has been entered and Subharmonic Locking mode is
enabled, the 5344S calculates an internal subharmonic integer by dividing the entered locking
frequency by the selected signal source frequency as measured by the 5342A/43A. If this result is
close to an integer (typically 10%), the 5344A rounds it and uses it as the Frequency Multiplier. If
the 5344A determines the Frequency Multiplier to be greater than "4", it will display Err 09
indicating that it cannot determine the multiplier and the correct value must be manually
entered.
3-91.
To manually enter a Frequency Multiples Marker 9 is selected and then the multiplier is
entered and terminated by pressing any one of the unit keys (GHz/s, MHz/ms).
3-92.
The Frequency Multiplier number is applied to all frequencies entered into the 5344A
except for AF and Step Size.
3-93.
MODE Switch (NORM/SUBHMNC on Rear Panel)
3-94.
Since there is a possibility of locking to the wrong frequency if the sweeper is mistuned, a
switch is provided to disable the Subharmonic Locking mode. The switch should be set to NORM if:
1.
The plug-in does not use frequency multiplication.
2.
The plug-in uses frequency multiplication, but the 5342A/43A is connected to the panel RF
output.
3.
There is a desire to utilize the subharmonic signal, but you prefer to enter the sub-harmonic
frequency on the 5344A rather than the actual sweeper output frequency.
3-95.
The position of the MODE switch is indicated by the rightmost decimal point of the numeric
display. It is lit when subharmonic locking is in effect (SUB HMNC position) of MODE switch.
3-96.
Since the 5342A/43A counter display is produced by multiplying the counted subharmonic
signal (1 Hz resolution) by the harmonic number N, its resolution is only N • Hz. The 5344S
synthesizer's resolution is .01 Hz, so the actual locked sweeper output frequency resolution is still 1
Hz, regardless of harmonic number.
3-97.
When in REMOTE (HP-IB) operation, the 5344A LOOP BANDWIDTH and Subharmonic
Locking MODE switches are ignored. These functions are controlled via HP-IB commands until
REMOTE mode is terminated. See paragraph 3-138.
3-11
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