11. Cover all empty slots using filler panels or slot blockers to maximize cooling air flow.
12. Power on the chassis.
Connecting Signals
Direct Connections to the NI 5691
The NI 5691 is a precision RF instrument that is sensitive to ESD and transients. Ensure you
are making proper direct connections to the NI 5691 to avoid damaging the device.
Caution
Apply external signals only while the NI 5691 is powered on. Applying
external signals while the device is powered off may cause damage.
To prevent possible damage to the device, use caution when connecting signal sources and RF
antennas directly to the IN connectors of the NI 5691. Operators, technicians, and all other
users should ensure they are properly grounded when manipulating cables or antennas
connected to the NI 5691 IN connectors.
If you are using noninsulated devices, such as a noninsulated RF antenna, ensure the devices
are maintained in a static-free environment. If you are using an active device, such as a
preamplifier or switch routed to the NI 5691 IN connectors, ensure that there are no signal
transients greater than the RF and DC specifications for the device that are being generated
and sourced to the NI 5691 IN connectors.
Torquing SMA Connections
Note
A coaxial cable with open ends can function as a capacitor. Before
connecting any open-ended cable to the NI 5691, momentarily short the center and
outer connectors of the cable together.
Note
For best results when connecting signals to the NI 5691 front panel SMA
connectors, use shielded low-loss coaxial cables.
Torque all connections to 100 N
⋅
cm using a standard SMA torque wrench. Apply force
until the wrench clicks.
6
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NI PXI-5691 Getting Started Guide
