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RISETME
MANAUTO
If
y
ou
are
using
an
HP
70341A
with
the
HP
70340A,
selecting
the
NNNNNNNNNNNNNN
Misc
men
u
and
then
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
RISETME
MANAUTO
allo ws
y
ou
to
c
ho ose
man
ual
(slo
w,medium,
or
fast)
pulse
risetime
or
enables
the
instrumen
t
to
automatically
select
optimum
pulse
risetime
for
the
selected
carrier
frequency
.
The
4
INSTR
PRESET
5
( 4
I-P
5)
state
of
this
function
is
A
UTO.
When
y
ou
select
RISETIME
MANUAL,
three
functions:
RISETIME
F
AST,
RISETIME
MEDIUM,
and
RISETIME
SLO
W
are
display
ed.
The
risetime
can
b e
set
to
one
of
these
three
discrete
v
alues;
risetime
is
not
con
tinuously
v
ariable.
Note
RISETIME
MANUAL
A
UTOMA
TIC
can
b e
selected
at
an
y
carrier
frequency
,
but,
at
carrier
frequencies
ab o
v
e
1
GHz,
pulse
risetime
is
xed
at
10
ns.
Note
When
y
ou
man
ually
set
the
risetime
with
this
function,
the
falltime
(pulse
trailing
edge)
will
b e
automatically
set
to
the
same
v
alue.
There
is
no
metho d
of
c
hanging
the
falltime
indep enden
tly
of
the
risetime.
Applications
A
series
of
low
pass
lters
are
used
to
reduce
output
harmonics
when
the
HP
70340A
output
frequency
is
less
than
1
GHz.
The
lter
passbands
can
b e
narrow
enough
to
induce
pulse
ringing
if
the
pulse
risetime
is
to
o
fast.
The
HP
70340A
automatically
selects
a
slow
er
pulse
risetime
(when
A
UTO
is
selected)
as
the
carrier
frequency
is
decreased
to
minimize
ringing
and
video
feedthrough
caused
b
y
the
low
pass
ltering.
The
appropriate
pulse
risetime
is
automatically
selected
as
follo ws:
Output
F
requency
Pulse
Risetime
10
MHz
to
64
MHz
300
ns
64
MHz
to
500
MHz
30
ns
Greater
than
500
MHz
10
ns
In
applications
where
a
faster
pulse
risetime
than
that
sho
wn
in
the
table
is
needed
at
output
frequencies
less
than
1
GHz,
y
ou
can
man
ually
c
ho ose
a
pulse
risetime.
The
disadv
an
tage
of
c
ho osing
a
faster
pulse
risetime
is
degraded
pulse
p erformance.
5-92
Signal
Generator
Menus
and
Functions
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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