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2. Testing Safety Systems
During startup the system tests the safety systems as described in this section. If any of the tests fail, the system
will cause a permanent error, resulting in the system displaying a message and not allowing the user to put the
system into User mode.
a. Safety Shutter
The system will verify that the nofire sets the safety shutter, preventing it from opening.
b. Independent Clock
The system verifies that the independent clock agrees with the system clock within 1% over a
period of at least 100mS.
c. Inadvertent Exposure
The system verifies that the Safety EPLD can detect an inadvertent exposure, and that after an
inadvertent exposure, no laser will fire.
d. Exposure Disabling Signals
The system verifies that when any one of the signals in the table below is in the indicated state,
no laser will fire.
+15V power sup-
ply error
Clearable Power supply output voltage differs from the nomical greater than
20%.
-15V power supply
error
Clearable Power supply output voltage differs from nominal by greater than
20%.
Signal State
Nofire Asserted
Disable1 Asserted
Error Error Type Condition
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