Apple MAC PRO for 3X108 - Manual (Page 47)

Appendix Server Diagnostics Test Reference 47
Sensor Tests
When Server Diagnostics Mac OS X starts, it performs a hardware existence test.
Sensors found during this test can be tested individually using sensor tests.
Test Estimated completion time Description
Sensor Reads 1 second Verifies that the sensor reads are
within the preset sensor limits.
SMC PID Sensor Tests
The System Management Controller (SMC) monitors the Proportional Integral
Derivative (PID) controller which controls several important temperature sensors.
SMC sensors can be tested individually using these tests.
Test Estimated completion time Description
SMC PID Sensor 1 second Checks the SMC PID sensor
warning counter for erratic
behavior.