Specifications

4-42
Hardkey/Softkey Reference
Analyzer Functions
makes power level the active function and sets the RF
output power level of the analyzer's internal source. The
analyzer will detect an input power overload at any of the
three receiver inputs. This is indicated with the message
"OVERLOAD ON INPUT (R, A, B)." If power meter cal is
on, cal power is the active entry.
sets the external LO fixed power.
leads to the power ranges menu which allows the user to
select among 12 power ranges from −75 to −5 dBm.
sets the external LO power sweep.
brings up the segment modify menu and segment edit
(power loss) menu explained in the following pages. This
softkey is intended for use when the power output is being
sampled by a directional coupler or power splitter. In the
case of the directional coupler, enter the power loss caused
by the coupled arm.
This feature may be used to compensate for attenuation
non-linearities in either a directional coupler or a power
splitter. Up to 12 segments may be entered, each with a
different frequency and power loss value.
toggles between or . These power meters
are GPIB compatible with the analyzer. The model
number in the softkey label must match the power meter
to be used.
turns on a power sweep mode that is used to characterize
power-sensitive circuits. In this mode, power is swept at a
single frequency, from a start power value to a stop power
value, selected using the and keys and the
entry block. This feature is convenient for such
measurements as gain compression or AGC (automatic
gain control) slope. To set the frequency of the power
sweep, use in the stimulus menu. Refer to the
user's guide for an example of a gain compression
measurement.
Note that power range switching is not allowed in power
sweep mode.
In power sweep, the entered sweep time may be
automatically changed if it is less than the minimum
required for the current configuration (number of points,
IF bandwidth, averaging, etc.).
presents a menu to select a factory or user defined preset
state.
Power
POWER: FIXED
POWER RANGES
POWER: SWEEP
POWER LOSS
POWER MTR
436A
438A/437
POWER SWEEP
Start Stop
CW FREQ
Preset