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HP 8642A Operation And Calibration Manual

HP 8642A
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Model
8642A/B
Operation
Modulation,
<PM
(cont'd)
Related
Operating
Instructions
113.
Modula
tion
Frequency
Correction
Off.
This
special
function
disables
the
single-band
calibration
of
the
modulation
frequency
oscillator
that
normally
occurs
whenever
the
modulation
oscillator
frequency
is
set
or
the
internal
modulation
oscillator
is
put
into
use,
When
this
calibration
is
disabled,
the
typical
modulation
frequency
switching
time
is
decreased by
approximately
200
ms.
For
more
information,
refer
to
"Speeding Up
Modulation
Switching
Time", page
3-132.
213.
Modulation
Frequency
Correction
On.
This
special
function
re-enables
the
modulation
frequency
correction
disabled
with
Special
Function
113.
114.
Negative
<PM
Polarity.
This
special
function
causes a positive
voltage
applied
to
the
external
FM/<PM
INPUT
to cause a phase lag
and
a
negative
voltage
applied
to
cause
a phase lead,
214.
Positive.pM
Po]al'ity.
This
special
function
causes a positive voltage applied
to
the
external
FM/<pM
INPUT
to
cause a phase
lead
and
a
negative
voltage
applied
to
cause a phase lag.
119.
Disable Settling, This special
function
allows
the
Signal
Generator's
microprocessor
to
respond to
new
commands
without
waiting
for
the
internal
circuitry
to
settle.
When
using this special
function,
it's possible to select a
function
before
the
previous
function
has finished settling.
When
settling
is
disabled, response
time
is
improved
by
up
to
40
ms.
Special
Function
119
disables
out-of
-lock
messages
219.
Re-enable
Settling. This special
function
re-enables
the
settling
that
is
disabled
when
Special
Function
119
is
selected.
248.
Calibrate
the
Modulation
Frequency
Bands
Again.
This
special
function
enables
you to
initiate
the
calibration
sequence
that
normally
only
occurs
during
instrument
power-up,
This
function
can
be used,
for
example,
to
recalibrate
the
modulation
oscillator
frequency
bands
if
normal
modulation
frequency
correction
has been disabled
with
Special
Function
11
3.
Calibration
typically
takes
one to
two
seconds.
Refer
to
Modulation
Oscillator
(page
3-131)
for
more
information
OIl
the
internal
modulation
oscillator
that
is
the
common
source
for
all
internal
modulation
as well as
for
the
MOD
OUTPUT
connector.
Refer
to
Knob
(page
3-141)
and
Step,
Increment
Set (page
3-149)
for
information
on
using these
to
modify
settings.
Refer
to
Operating
Messages (page
3-177)
if
the
instrument
displays a message
you
want
clarified,
Refer
to Special FUllctions (page 3
-165)
for
inforrna
tion a bou t t he
way
these
are
accessed.
3-125

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HP 8642A Specifications

General IconGeneral
BrandHP
Model8642A
CategoryInverter
LanguageEnglish

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