to the chassis grounding terminal. Solder the other end of the wire to the cable
shield. Use shorter wire for better EMC performance.
For more information about ground connections, visit
and enter the Info Code
emcground
.
Internal Real-Time Clock
The cRIO-9081 contains an internal real-time clock that maintains system time when the
cRIO-9081 is powered off. The system clock of the cRIO-9081 is synchronized with the
internal real-time clock at startup. You can set the real-time clock using the BIOS setup utility
or MAX, or you can set the clock programmatically using LabVIEW.
Refer to the specifications on
for the real-time clock accuracy specifications.
CMOS Battery
The cRIO-9081 contains a CMOS battery. The CMOS battery is a lithium cell battery that
stores the system clock information when the cRIO-9081 is powered off. There is only a slight
drain on the CMOS battery when power is applied to the cRIO-9081 power connector. The
rate at which the CMOS battery drains when power is disconnected depends on the ambient
storage temperature. For longer battery life, store the cRIO-9081 at a cooler temperature and
apply power to the power connector. Refer to the specifications on
for the
expected battery lifetime.
The
CMOS BATTERY IS DEAD
warning appears onscreen during the power-on self test if the
battery is dead. The cRIO-9081 still starts, but the system clock is reset to the date and time of
the BIOS release. The battery is not user-replaceable. If you need to replace the CMOS
battery, contact NI. Refer to the specifications on
for information about
battery disposal.
Mounting the Device
To obtain the maximum allowable ambient temperature of 55 °C, you must mount the
cRIO-9081 horizontally on a flat, metallic, vertical surface such as a panel or wall. You can
mount the cRIO-9081 directly to the surface or use the NI Panel Mounting Kit. The following
figure shows the cRIO-9081 mounted horizontally.
NI cRIO-9081 User Manual
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© National Instruments
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