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HP 8642A Operation And Calibration Manual

HP 8642A
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Model
8642A/B
Operation
Amplitude
Sweep
(cont'd)
Related
Special
Functions
Relative
Amplitude
Sweep
It
is
not
possible
to
set
an
amplitude
sweep
directly
in
relative
units.
Refer
to
page
3-205
for
amrlitude
units
conversion
information
to
determine
amplitude
sweep
start
and
stop
end-points
in
absolute
units.
X
AXIS
A
OV
to + I
OV
stepped
output
is
available
at
the
X AXIS
output
connector
on
the
rear
paneL
The
amplitude
points
at
the
output
coincide
with
the
points
in
the
sweep
time
calculations
Z
AXIS
A
blanking
pulse is
available
at
the
Z AXIS
output.
(The
blanking
pulse is
TTL
positive
true
for
CRT
blanking
during
retrace.)
There
is a
time
that
occurs
between
the
end
of
the
sweep
and
the
beginning
of
the
next
sweep
while
the
Z AXIS
output
is
blanked
and
the
frequency
and
X AXIS
output
are
being reset This
time
is called
start
-of
-sweep
settling
time.
Start
-of
-sweep
settling
time
is
not
included
in
the
sweep
time
setting.
Also,
start
-of
-sweep
settling
time
is
not
selecta ble.
For
amplitude
sweep,
this
settling
time
is
approximately
15%
of
sweep
time
with
a
minimum
of
7 ms
and
a
maximum
of
500
ms.
121.
Sweep
Up
and
Down On.
During
auto
or
single sweep modes,
the
Signal
Generator
sweeps
from
the
start
end-point
to
the
stop
end·-point
and
then
sweeps
from
the
stop
end-point
to
the
start
end-point
in
the
same
amount
of
time.
See
Figure
3-10
below
for
a
comparison
of
the
normal
sweep
mode
(Sweep
Up
and
Down
Off;
Special
Function
221)
and
the
up
and
down
sweep mode (Sweep
Up
and
Down
On;
Special FUIlction
121)
(The
wa
vefotms
are
not
drawn
to
scale.)
There
is
no
start-of-sweep
settling
time
when
this
special
functIon
is
selected. Also,
Z-AXIS
is
always
TTL
low.
221. Sweep
Up
and
Down
Off.
This
special
function
reo-enables
the
normal
sweep
that
is disabled
with
Special
Function
121. Special
Function
221 sets
the
Signal
Generator
to
sweep
from
the
start
end-point
to
the
stop
end-point,
and
then
again
from
the
start
end-point
to
the
stop
end-point.
t
NORMAL
SWEEP
MODE
l-
=>
"-
I-
=>
o
In
H
X
'"
I
X
UP
AND
DOWN
SWEEP
MODE
TIME
---------
..
Figure
3-10.
Sweep
Waveforms
3-93

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HP 8642A Specifications

General IconGeneral
BrandHP
Model8642A
CategoryInverter
LanguageEnglish

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