HP 70000 series, User Manual

Page: 142 / 447

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COUPLNG AC DC
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CONV LOSS
(conversion loss) osets the reference level to compensate for amplitude losses at the
active input port. If necessary , use
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select input to activate the desired input port before
specifying its conversion loss oset.
T o clear a reference-level oset, enter a conversion loss of zero .
After instrument preset, an oset value of 30 dB is activated automatically for the input port
of the external mixer interface module .
See the
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select input softkey description.
Functional Type:
external-mixer
Firmkey A ccess:
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State
Preset State:
Depends on
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preset input setting.
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COUPLNG AC DC
activates ac or dc coupling for the spectrum analyzer input. Coupling options vary from
system to system. When a microwave RF module , such as HP 70905A RF section, HP 70905B
RF section, HP 70906A RF section , or HP 70908A RF section, is present, only ac coupling
is available . Their RF counterpart, HP 70904A RF section, oers both ac or dc coupling.
Instrument preset activates ac coupling.
Functional Type:
signal-path
Firmkey A ccess:
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State
Preset State:
Depends on hardware and
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preset input .
Softkey Descriptions 4-47