National Instruments NI 5670 用户手册

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15
NI RF Signal Generators Getting Started Guide
Figure 5.  Proper NI 5670/5671/5672 Front Panel Interconnection
3.
Carefully tighten all SMA connectors to 100 N-cm using an SMA 
torque wrench (not included), as shown in Figure 6. Tighten only until 
the wrench clicks.
Note
Incorrect torque at SMA connections can degrade signal fidelity, PLL performance, 
and insertion loss. Use an SMA torque wrench to ensure all SMA connections are properly 
torqued to 100 N-cm.