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HP 5335A - Page 42

HP 5335A
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Operation
and
Programming
of
a
signal,
use
external
arming.
Set
the
Start
Arming
Slope
to
positive
and
using
an
oscilloscope,
position
the
leading
edge
just
ahead
of
the
selected
slope
of
the
signal.
With
SLOPE
A
positive,
the
counter
will
display
the
rise
time;
with
SLOPE
A
to
negative,
the
counter
will
display
the
fall
time.
Measurements
are
displayed
in
units
of
seconds.
AUTO
TRIG
TRIGGER
LEVELS
3-131.
SLEW
A
3-132.
The
SLEW
A
mode
is
similar
to
the
RISE/FALL
A
mode,
with
the
counter
automatically
selecting
COM
A
and
AUTO
TRIG.
However,
to
more
easily
accommodate
analog
signals,
the
measurement
is
displayed
in
units
of
Voits/seconds.
Additionally,
the
MATH
operations
may
also
be
selected
to
achieve
a
direct
readout
of
the
desired
units.
For
example,
programming
the
NORMLZ
function
with
values
of
103
or
103
will
produce
slew
rates
in
units
of
volts/
millisecond
and
volts/microsecond,
respectively.
As
with
RISE/FALL
A,
the
measurements
with
SLEW
A
are
with
respect
to
the
10%
and
90%
points
of
the
input
and
the
input
must
be
con¬
tinuous.
Also,
slew
rates
on
selected
slopes
may
be
made,
using
the
external
arm
method.
3-133.
DUTY
CYC
A
3-134.
The
DUTY
CYC
A
mode
measures
and
displays
the
proportional
percentage
of
either
the
positive
or
negative
durations
of
a
given
input
digital
waveform.
The
percentage
of
the
positive
pulse
is
given
when
the
SLOPE
A
control
is
set
to
jf
.
The
percentage
of
the
negative
pulse
is
given
with
the
control
set
to
.In
this
mode,
the
counter
automatically
sets
the
GATE
MODE
to
MIN.
3-135.
Duty
cycle
is
actually
measured
indirectly
through
two
measurements,
Period
and
Pulse.
Therefore,
the
signal
should
have
a
constant
duty
cycle
in
order
to
be
accurately
measured.
If
a
particular
place
in
a
pulse
stream
needs
to
be
examined
in
a
changing
duty
cycle
environment,
be
sure
that
the
characteristics
are
repetitive.
3-136.
To
measure
the
positive
duty
cycle
of
a
continuous
asymmetrical
waveform,
select
DUTY
CYC
A,
set
the
SLOPE
A
control
to
jf
and
set
triggering
to
Auto
Preset.
The
counter
will
display
a
value,
typically
between
1
and
99
(“25”
in
this
example)
representing
the
duty
cycle.
No
unit
annunciators
will
light,
as
duty
cycle
is
assumed
as
"percentage”.
CHANNEL
A
-
-
j
Uf
L
1
f
tit
NEGATIVE
T
POSITIVE
DUTY
^
DUTY
CYCLE
CYCLE
(25%)
(75%)
NOTE
Duty
Cycle
should
be
measured
with
the
trigger
level
set
between
the
40%
and
60%
points
of
the
signal
peaks.
3-26
Model
5335A

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