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Frequency offset is entered as a negative value since
the input frequency to the converter is lower than the
output.
EFFECTIVE MIXER LEVEL
The effective mixer level is equal to the REFERENCE LEVEL minus the INPUT ATTENUATOR setting. It speci-
fies the maximum signal level that will be applied to the input mixer for a signal that is equal to or below the
REFERENCE LEVEL. A FULL SPAN key (0 - 2.5 GHz or 2 - 22 GHz) sets the mixer level to - 10 dBm, which
is 5 dB below the analyzer's 1 dB compression point. The effective mixer level can be manually set from - 10
numeric keyboard. For instance, to set a mixer level at -40 dBm, press: (,,IIl , m d (zl . As the
analyzer's REFERENCE LEVEL is changed, the coupled input attenuator will automatically change to limit the
maximum signal at the mixer to - 40 dBm for signals I REFERENCE LEVEL.
AMPLITUDE UNITS
The following shift key codes immediately select the corresponding units for all the amplitude readouts: reference
level, marker, display line, and threshold.
When a units change is made, all readouts are converted so as to preserve the absolute power levels of all the
readouts. For example, a 0 dBm threshold level converts to 47.0 dBmV (50 ohm input) when dBmV units are
called.
SHIFT KEY
FUNCTION
A.
The keys for these functions are located in the COUPLED FUNCTION
'In the Extended Reference Level Range (Shift I, under EXTEND REFERENCE LEVEL RANGE in this chapter), the effective mixer
level can be set to 0 dBm.
. (or FULLSPAN key) . . . . . . . dBm
.
.
.
.
AMPLITUDE
UNITS
group.
Manual Operation 93
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