Agilent Technologies TV 551/701 Navigator Notice De Mode D'emploi page 280

17 Technical Information
Interconnections
Figure 22
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:
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reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
TV 551/701 Navigator User Manual / 87-900-934-01 (P)