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Model 8902A
Operation
Limit
FUNCTIONS
RATIO, Special Function
14
(Limit)
DESCRIPTION
Using Special Function
14
and the RATIO key, lower and upper measurement limits can be entered
into the Measuring Receiver. Subsequent out-of-limit measurements will then cause the LIMIT
annunciator
to
light.
Wheii the Limit feature is enabled, the Measuring Receiver can be configured to issue an HP-IB
service request upon reaching a lower o r upper limit (Refer to the Rcrnofc section in this manual o n
page 3-27.) 'The LIMIT light turns
off
five measurement cycles after the condition causing limiting
is cleared.
Only o n e lower and o n e upper limit can be set. Once
a
limit has been set, it can be used only for that
Measurement mode. (However, o n e limit can be used for o n e 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 estabiish a ratio reference and set it as a limit:
First enter thc desired limit reference as a ratio reference and then set the lower or upper limit to
that ratio referen.ce:
1. Select the Measurement mode for which the limit is to be used.
2.
Key in the reference value followed by the RATJO key
(Do
not use a terminator. The units
will s a y 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. I SPCL) o r the upper limit
(1 4.2
SPCL)
to the ratio reference.
4. To display the measurement result in absolute units, select RATIO again.
3-249
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