Atek HP 8753D, Руководство пользователя, Страница: 506 / 677

from 0 to 32767 and terminate with the 4 x1 5 key . The default
value of the counter is zero . This command should be placed in
a sequence that is separate from the measurement sequence .
F or this reason: the measurement sequence containing a loop
decision command must call itself in order to function. The
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LOOP COUNTER command must be in a separate sequence or the
counter value would always be reset to the initial value .
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LOOP COUNTER
(Sequence Filenaming)
inserts the string \[LOOP]" into the lename .
N
NNNNNNNNNNNNN
LOSS
accepts a power loss value for a segment in the power meter
cal power loss list. This value , for example , could be the
dierence (in dB) between the coupled arm and through arm of
a directional coupler .
N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LOSS/SENSR LISTS
presents the power loss/sensor lists menu. This menu performs
two functions:
Corrects coupled-arm power loss when a directional coupler is
used to sample the RF output.
Allows calibration factor data to be entered for one or two
power sensors .
Each function provides up to 12 separate frequency points ,
called segments , at which the user may enter a dierent power
loss or calibration factor . The instrument interpolates between
the selected points . Two power sensor lists are provided
because no single power sensor can cover the frequency range
possible with an HP 8753D .
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LOW PASS IMPULSE
(Option 010 only) sets the transform to low pass impulse mode ,
which simulates the time domain response to an impulse input.
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LOW PASS STEP
(Option 010 only) sets the transform to low pass step mode ,
which simulates the time domain response to a step input.
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LOWER LIMIT
sets the lower limit value for the start of the segment in a
limit line list. If an upper limit is specied, a lower limit must
also be dened. If no lower limit is required for a particular
measurement, force the lower limit value out of range (for
example 0500 dB).
4
M/
5 mega/micro (10
6
/ 10
-6
)
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MANUAL TRG ON POINT
waits for a manual trigger for each point. Subsequent pressing
of this softkey triggers each measurement. The annotation
\man" will appear at the left side of the display when the
instrument is waiting for the trigger to occur . This feature
is useful in a test sequence when an external device or
instrument requires changes at each point.
4 MARKER 5 displays an active marker on the screen and provides access to
a series of menus to control from one to ve display markers
for each channel. Markers provide numerical readout of
measured values at any point of the trace .
The menus accessed from the 4 MARKER 5 key provide several
basic marker operations . These include special marker modes
for dierent display formats , and a marker delta mode that
K ey Denitions 9-21