National Instruments NI 5422 用户手册

© National Instruments Corporation

Figure 12.  Direct Path, Two-Tone Spectrum (Typical)

The noise floor in Figure 12 is limited by the noise floor of the measurement device. 

Refer to the Noise Floor specification.

Sources

1. Internal, Divide-by-N (N 

≥ 1)

2. Internal, DDS-based, High-Resolution

3. External, CLK IN (SMB front panel connector)

4. External, DDC CLK IN (DIGITAL DATA & 

CONTROL front panel connector)

5. External, PXI Star trigger (backplane connector)

6. External, PXI_Trig<0..7> (backplane connector)

Refer to the 

section for more 
information 
about Internal 
Clock Sources.

0

10

20

30

40

50

60

70

80

90

100

Frequency (MHz)

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

dBm