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Product description
The timing relationships for an idealised probe signal are indicated in figure 2.
A solid state relay (SSR) output is provided which mimics the PICS-SYNC output for
connection to older CMM controllers that require voltage-free contacts to simulate the
trigger signal of a kinematic switching probe.
2. Trigger confirmation signal (HALT)
To allow the CMM controller to distinguish between a valid trigger and a spurious trigger
caused by vibration or shock, a trigger confirmation signal (HALT) is provided on the
PICS port. HALT will be asserted if the probe current remains greater than trigger level
2 for a pre-set delay time, determined by the settings of configuration switches 11
and 12. The timing relationships for an idealised TP200 probe signal are indicated in
figure 2.
Should the probe current fail to reach the trigger level or drop below the reseat level
before the delay time has expired, as might be the case for a vibration-induced signal,
HALT will not be asserted. The CMM controller may then assume the trigger was
spurious and reject the coordinate data.
When a kinematic switching probe (TP20, TP6, TP1, TP2) is connected, the HALT delay
time is fixed at 5 milliseconds as indicated in figure 3.
