Martel Electronics 135 - Manual (Page 42)

Trip Detect
The trip detect feature is used in conjunction with the Ramp Function.
Trip detect is a feature to aid in calibrating trip point alarms under
simulated operating conditions. The ramp output of the calibrator
simulates the changing process as an input to the alarm circuit.
The contact output of the alarm circuit connects back to the voltage
input of the calibrator.
The trip detect feature can utilize the volts input terminals. If the alarm
circuit has powered contacts, the volts input should be used. If the
alarm circuit has dry or non-powered contacts, a source of voltage must
be provided to allow the contact closure to be detectable. The
maximum input voltage is 30 volts; however, the calibrator can only
detect changes in the 0-10 volt range. This is normally not a problem,
since the powered contacts typically switch between 0 volts and 24
volts.
A change of more than 1 volt on the input is considered a change of
state of the alarm circuit.
Trip detect is enabled when the Ramp Function is initiated. The final
prompt when initiating the ramp is to enable or disable the trip detect
function. If you enable the trip detect function, the input function will
monitor for a significant change in its input measurement. When a
change is detected, the output ramp is stopped and the current value is
displayed.
The ramp is controlled by the INC/DEC keys. The first press of the INC
or DEC key will cause the ramp output to assume the full scale or zero
value, respectively. The second press of the key will cause the ramp to
start and the input function to start monitoring for a change of state.
When the change of state is detected, the ramp is stopped. Pressing
the INC or DEC key again will restart the cycle.
Input Functions
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