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Glossary
acquisition Denotes one complete
cycle of data gathering by a module.
For example, in the HP 16532 oscillo-
scope, one complete cycle gathers
8000 samples of information and
stores them in acquisition memory.
arm The arm output from a mod-
ule is set false when the module
begins running and is set true when
the module finds its trigger condi-
tion. Other measurement modules
that take the arm signal as an input
are unable to capture data or search
for their triggers until they receive
their arm signal. The arm signal is
usually used to coordinate measure-
ment start between two or more
measurement modules.
attenuation factor See probe
field.
autoscale algorithm An algo-
rithm for oscilloscope modules that,
based on the amplitude and period
of the signals found, sets the vertical
sensitivity in volts per division, off-
set, horizontal sweep speed in
seconds per division, trigger level,
and trigger slope for the trigger in-
put. Its purpose is to set up the
system so that two to five cycles of
the input waveform are displayed on
the screen. The waveform is from
the lowest numbered and lettered
channel with a signal.
cancel autoscale The field that al-
lows you to cancel an autoscale
command. This field is particularly
important if you inadvertently select
the Autoscale field when you have
your measurement configuration set.
Automatically scaling your signals at
this point could change your present
configuration.
cancel run The field that allows
you to cancel making an oscilloscope
run for any reason once you have se-
lected the Run field.
coupling field The field that sets
the input impedance for the signal
applied to oscilloscope channels. For
example, in the HP 16532A, the in-
put coupling can be set to 1
Mohm/DC, 1 Mohm/AC, and 50
ohm/DC.
cross triggering Using inter-
module capabilities to have
measurement modules trigger each
other. For example, you can have an
external instrument arm a logic ana-
lyzer, which subsequently triggers an
oscilloscope when it finds the trigger
state.
delay field The field that sets the
horizontal position of the waveform
on the screen for the oscilloscope
and timing analyzer. Delay time is
measured from the trigger point. It is
measured in seconds, can be viewed
Glossary–1