HP 54620A, Руководство пользователя и сервисное руководство

Страница: 219 / 243

including setting the time base and
thresholds and displaying waveforms
for channels connected to active sig-
nals.
Autostore records the result of
every acquisition on the display in
half-bright tone. When Autostore is
on, the analyzer updates pixel (dis-
play) memory with new acquisitions,
but does not erase the results of pre-
vious acquisitions.
Channel controls allow you to
move or rearrange channels, turn
them on or off, and add descriptive
labels.
Clock channel is the reference
point for the setup-time and hold-
time measurements.
Control knobs include the
Time/Div, Delay, Select, Position, En-
try, and display intensity knob.
Cursors are used to measure
either time between particular
points on the display or numeric val-
ues of the currently displayed
waveforms.
Data acquisition See “Acquisi-
tion.”
Data channel is the channel for
which you want to measure setup or
hold time.
Delay time in Main sweep is the
time between the current trigger and
the time reference point. In Delayed
sweep, it is the time between the
center of the delayed sweep window
and the time reference position. In
dual-channel measurements, it is the
time between the transition on the
start channel and a transition on the
end channel.
Delayed sweep is the analyzer dis-
play function that magnifies the
contents of sample memory. Use de-
layed sweep to zoom in on a portion
of the waveform and examine it in
greater detail.
Display memory is also called
pixel memory. The display memory
is part of the display subsystem, and
is located in the waveform RAM. A
data-to-waveform conversion gate ar-
ray is provided to convert the data
and display the acquisition. Also see
“Autostore.”
Dual-channel measurements
measure the time between edges on
two different channels, including
channel-to-channel delay, setup
time, and hold time.
Glossary
218