Agilent Technologies TV 303 Bedienungshandbuch Seite 219

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:
Figure 12
The set point output stays at 0 Vdc until the fre-quency 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 becomes 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:
TV 303 User Manual / 87-901-019-01
reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
Programmable set point
(A)
Technical Information
Interconnections
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