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Caution If you use shielded cabling to connect to a C Series module with a plastic

connector, you must attach the cable shield to the chassis grounding terminal using

1.31 mm

(16 AWG) or larger wire. Attach a ring lug to the wire and attach the wire

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 ni.com/info and enter the Info Code

emcground.

Internal Real-Time Clock

The NI 9147 contains an internal real-time clock that maintains system time when the NI 9147

is powered off. The system clock of the NI 9147 is synchronized with the internal real-time

clock at startup. You can set the real-time clock using MAX, or you can set the clock

programmatically using LabVIEW.

Refer to the specifications on ni.com/manuals for the real-time clock accuracy specifications.

Battery

The NI 9147 contains a lithium cell battery that stores the system clock information when the

NI 9147 is powered off. There is only a slight drain on the battery when power is applied to

the NI 9147 power connector. The rate at which the battery drains when power is disconnected

depends on the ambient storage temperature. For longer battery life, store the NI 9147 at a

cooler temperature and apply power to the power connector. Refer to the specifications on

ni.com/manuals for the expected battery lifetime.

The battery is not user-replaceable. If you need to replace the battery, contact NI. Refer to the

specifications on ni.com/manuals for information about battery disposal.

Mounting the Device

To obtain the maximum allowable ambient temperature of 70 °C, you must mount the NI 9147

horizontally on a flat, metallic, vertical surface such as a panel or wall. You can mount the

NI 9147 directly to the surface or use the NI Panel Mounting Kit. The following figure shows

the NI 9147 mounted horizontally.

Figure 6. NI 9147 Horizontal Mounting

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National Instruments NI 9147 User Manual

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