Agilent Technologies TV 801 Navigator Bolted Flange Notice De Mode D'emploi page 221

Figure 11
FAULT: this open collector output signal is ON when a system fault
condition is detected.
PROGRAMMABLE SET POINT: this open collector output signal is
enabled when the reference quantity chosen (frequency, current or
time) is higher than the set threshold. The signal can be "high level
active" (that is the output is normally at 0 Vdc and becomes 24 Vdc
when activated), or "low level active" (that is the output is normally at
24 Vdc and becomes 0 Vdc when activated). Moreover, if the reference
quantity is the frequency or the current drawn, it is possible to set the
hysteresis (in % of the threshold value) to avoid bouncing.
For example:
TV 801 Navigator Bolted Flange User Manual / 87-900-980-01 (D)
reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
actiation type: "high level"
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