Agilent Technologies TwisTorr 305-IC Mode D'emploi page 271

For example:
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Figure 51
The set point output stays at 0 Vdc until the frequency becomes higher than 505 Hz
(that is 500 Hz + 1% of 500 Hz), then the output goes at 24 Vdc and stays at 24 Vdc
until the frequency be-comes lower than 495 Hz (that is 500 Hz – 1% of 500 Hz).
It is possible to delay the set point checking for a programmable delay time.
The PROGRAMMABLE SET POINT signal has the following default settings:
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The TwisTorr 305-IC Software (optional) allows the operator to set all
NOTE
the programmable feature.
TwisTorr 305-IC User Manual / 87-901-058-01
reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
reference quantity: frequency
threshold: 909 Hz
hysteresis: 2 %
activation type: high level
delay time: 0 second
Technical Information
Signal Description
505
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