Agilent Technologies TV 551 Navigator Bedienungshandbuch Seite 252

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:
252/300
reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
TV 551/701 Navigator User Manual / 87-900-934-01 (M)