Chapter 3 Hardware Overview
NI PXI-8250 User Manual 3-4 ni.com

Fan Monitoring

The NIPXI-825 0 module allows the user to monitor the revolutions per
minute (RPM) of all rear-facing fans of a PXI chassis (two fans in an
NIPXI-10 42/1042Q and three fans in an NI PXI-1045), accurate to
±50 RPM. The fan data from the chassis is interpreted by the NI PXI-8250
and the FAN front panel LED reflects the status of all of the fans
collectively together. Hence, if one or more of the fans becomes
non-operational (status below 1500 RPM) the LED will turn red to indicate
a fan error. Otherwise, the fan LED will light green if all of the fans are
operating within normal tolerances.

Additional Monitoring Features

In addition to the system status monitoring features, the NI PXI-8250
module includes an alert relay and fused power outputs. These features are
useful for user-defined monitoring applications. Refer to the Front Panel
Connector section for more information on the fused power outputs.
Front Panel LEDs
The NIPXI-82 50 has 12 front panel LEDs, including 6 system status LEDs
and 6 user-configured LEDs, as shown in Figure 3-4. Upon boot, all
12 LEDs will flash orange while it is being configured. The module then
turns the LEDs off for 7 seconds until the first valid sample set is acquired.
Figure 3-4. NI PXI-8250 Front Panel LED Diagram
1System Status LEDs (x6) 2 User LEDs (x6)
1
2