
Stimulus Functions
S T I M U L U S
Figure 6-5. Stimulus Function Block
The stimulus function block keys are used to
the source RF output signal to the test
device by providing control of the following parameters:
n
swept frequency ranges
n
time domain start and stop times (Option 010 Only)
n
power sweep start and stop values
n
RF power level and power ranges
n
sweep time
n
sweep trigger
n
number of data points
n
channel and test port coupling
n
CW frequency
sweep type
Defining Ranges with Stimulus Keys
The
(Center), and
keys are used to
the swept frequency range, time
domain range (Option
or power sweep range. The range can be expressed as either
start/stop or center/span.
When
one of these keys is pressed, its function becomes the active
function. The value is displayed in the active entry area and can be changed with the knob,
step keys, or numeric keypad. Current stimulus values for the active channel are
displayed
along the bottom of the graticule. Frequency values can be blanked for security purposes,
using the display menus.
The preset stimulus mode is frequency, and the start and stop stimulus values are set to
30
and 3
(or 6
with Option 006) respectively. In the time domain (Option 010) or
in CW time mode, the stimulus keys refer to time (with certain exceptions). In power sweep,
the stimulus value is in
Because the primary channels are independent, their stimulus
signals can be uncoupled and their values set independently. The values are then displayed
separately if the instrument is in multiple channel display mode. In the uncoupled mode with
dual channel display the instrument takes alternate sweeps to measure the two sets of data.
Channel stimulus coupling is explained in the “Stimulus Menu” section, and
channel
display capabilities are explained in the “Display Menu” section located later in this chapter.
6-12 Application and Operation Concepts
Содержание HP 8753E
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