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Chapter 2 41
Operation
Using the Mixers with MMS Analyzers
Operation
CONV LOSS
(conversion loss) Offsets the reference level to compensate for amplitude losses at
the active input port. If necessary, use
select input to activate the
desired input port before specifying its conversion-loss offset.
To clear the offset, enter a conversion loss of zero.
After the instrument preset, a default value of 30 dB is activated
automatically for the input port of the external-mixer-interface
module.
Preset Input Sets which active input port will be selected when the INSTR
PRESET
is pressed. The preset input softkey can be accessed by
pressing
State, then MORE.
INSTR PRESET Resets to the preset input and to the lowest full frequency range
available. (For an external mixer, this is band A.) This is a front
panel key.
SIGNAL IDENT
(signal identify) Press Frequency, More, sig id options.
Executes a routine to identify real, in-band signals using either
the image (default) or shift methods.
Several options are available under
sig id options:
-
SIG ID ⇒ CF Places the marker on the identified real signal and
centers the signal on the display.
-
SIG ID MAN OFF Selects manual or automatic (default) mode.
-
IMAGE/SHIFT Selects the routine to use for identification.
-
SIG ID AMPTD ∆ Specifies the amplitude difference between the
marked signal and signals tested as images or
harmonics (default is 10 dB; applies only to IMAGE
mode.)
-
IMAGE N START Determines the frequency range for possible image or
harmonic responses by selecting the lowest and
highest local oscillator harmonic used for mixing,
according to the tuning equation below:
F
s
= N x F
LO
± IF
Default is 1.
-
IMAGE N STOP See “IMAGE N START” definition above.
Default is 40.