Model 8901B Operation
Limit
FUNCTIONS
RATIO, Special finction 14 (Limit)
DESCRIPTION
Using Special finction 14 and the RATIO key, lower and upper measurement limits can be entered
into the Modulation Analyzer. Subsequent out-of-limit measurements
will
then cause the LIMIT
annunciator
to
light.
When the Limit feature
is
enabled, the Modulation Analyzer can be configured
to
issue an HP-IB
service request upon reaching a lower or upper limit (Refer
to
the
Remote
section in this manual on
page 3-26.) The LIMIT light turns
off
five measurement cycles after the condition causing limiting
is
cleared.
Only one lower and one upper limit can be set. Once a limit
has
been set,
it
can be used only for
that
Measurement mode. (However, one limit can be used for one Measurement mode, and the other
limit for another Measurement mode.)
If,
after setting limits, another Measurement mode
is
selected,
the Limit feature
is
deactivated, but
it
is
restored automatically when the former Measurement mode
is
re-entered.
Both limit references can be displayed, cleared, and restored; the status of the Limit function can be
displayed; and the Measurement modes for which the limits were set can be displayed.
PROCEDURE
To establish a ratio reference and set it as
a
limit:
First enter the desired limit reference as a ratio reference and then set the lower or upper limit
to
that
ratio reference:
1.
Select the Measurement mode for which the limit
is
to
be used.
2. Key in the reference value followed by the RATIO key
(Do
not use
a
terminator. The units will
stay as currently displayed.)
To
change the
sign
of the reference, use the minus
(-)
key (Blue Key
and the decimal point key.)
To set the limits:
3. Set the lower limit (14.1 SPCL)
or
the upper limit (14.2 SPCL) to the ratio reference.
4. To display the measurement result in absolute units, select RATIO again.
Limit 3-219
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