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EXTEND REFERENCE LEVEL RANGE
Normally, the reference level can be set from - 89.9 dBm to + 30.0 dBm in coupled operation. The limits of the
range can be extended to a maximum of - 139.9 dBm and + 60 dBm.
I
The lower limit of reference level depends upon resolution bandwidth and scale.
Scale
linear
linear
When the reference level is set at a minimum, the level may change if either scale or resolution bandwidth is
changed. The extended range is disabled with instrument preset.
FACTORY PRESELECTOR SETTING
Activating (,,t = will reset the internal preselector to a factory set 2 - 22 GHz tracking range. The factory setting
provides a preset adjustment for each of the four frequency bands in the 2 - 22 GHz range. These preset adjust-
ments optimize the preselector tracking over the full 2 - 22 GHz frequency range. The tracking can be optimized at
any single frequency with the ()::::LJ key. A @ adjustment in one band will not affect the preselector tracking in
the other three bands. (See Chapter 6 for more information.)
MANUAL PRESELECTOR TRACKING
The internal preselector can be manually adjusted for a peak response in the 2-22 GHz band. m / @
enables manual entry of a DAC number from 0 - 63 with the DATA knob, step keys, or numeric keyboard. The
DAC reading corresponds to a voltage which sets a particular preselector tracking offset. The location of the
MARKER determines the band (four independently adjustable bands) to be adjusted.
The Manual Preselector Tracking function is useful for peaking the preselector at locations where a stable CW
signal is absent. For instance, drifting signals or pulse modulated signals do not easily lend themselves to the use of
manually tracking the preselector may provide a more reliable setting.
94 Manual Operation
Resolution
Bandwidth
Minimum reference level
with extended reference level
10 dB attenuation
0 dB attenuation
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