Pattern Key - HP 54501A Operation Reference

pattern Key

This is an unlabelled field. The display depicts the four-bit pattern. The
active field
The selection key changes the bit selection. The available selections are:
•
H - high
•
L - Iow
•
X
- don't care
The criteria for high is higher than the current trigger level, and low
lower than the current trigger level.
The four bit pattern
For example,
lower than the trigger level set for channel
cares so the input levels are disregarded, and the channel
higher than the trigger level set for channel four. If these conditions are
satisfied by the inputs, then the oscilloscope
When any channel is not being used in (he qualifier pattern, it
should be set
(he no input channel and a hig h or low
flUe don't care
If the pattern
trigger event
This
when Key
key controls five sets of conditions that mnst be satisfied to generate
a trigger event. These conditions are
•
when entered:
a pattern trne. The pattern must
trigg e r.
•
when exited:
the pattern false. The pattern must be true and go false to generate a
trigger.
is displayed in fullbright and
is representative of the four-channel input.
if
the pattern is LXXH, the voltage on channel
Note
as
don't care. The trigger level is
is X
XXXX is selected, no trigger event will occur because no
has
been defined.
is generated on the first transition that makes
a trigger
is generated on the first transition that makes
a trigger
can
be changed using the knob.
1,
channels 2 and
4 input must be
will
generate a trigger event.
stili compared to
is
determined. The only
as
follows:
be
false and go true to generate the
is
1
must be
3
are don't
Trigger Menu
6-9