OPERATOR ALERTS
The
3314A
will
automatically re-program certain parameters
when
an operator
selects related
functions
or in
the
case
of
DC
Offset,
Marker Frequency and ARB
Frequency,
when
the
operator tries
to
program the 331
4A
to
values
that
are
not
allowed. This feature helps
the
operator
by
not
forbidding an operation because
of
an arbitrary operating rule, or because
the
functions
were selected
out
of
order.
Since
the
operator
may
not
expect
these changes,
the
3314A
has Operator
Alerts.
The operator is
"Alerted"
from
the
front
panel
when
the
3314A
causes the
altered
parameter's
light
to flash on and
off
very
quickly.
The operator is
"Alerted"
from
the
HP-IB by
the
SRO message,
only
if
bit
#2
of
the
Status
Byte is unmasked. Note
that
bit
#2
will never be
set
if
masked.
Alerts
While Programming DC
Offset
The
3314A
only
allows
DC
Offsets
of:
.xxOVdc
.xx2Vdc
.xx5Vdc
.xx7Vdc
If
you
attempt
to
set
the
Offset
to
some
other
value,
.xx3
for
example,
the
3314A
will
set
the
Offset
to
the
closest
allowed
offset
and
"Alert"
the
operator.
Alerts While Programming The Marker Frequency
If
you
attempt
to
set
the
Marker Frequency outside
of
the
limits
set
by
the
Start
and
Stop
Frequencies, the
3314A
will
set
the
Marker Frequency
to
the closest
sweep end
frequency
and"
Alert"
the
operator.
Alerts While Changing Modes
When
you
change
from
either
of
the
Phase Lock modes to
any
other
mode,
the
Phase parameter
limits
change
from
±
199.9
0
to
±
90
0
• If
the
Phase prior
to
changing modes
was
> ±
90
0
, the
331
4A
will
set
the
phase = 0
0
and "
Alert"
the operator.
65
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