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NI 5421 Specifications 10 ni.com
Average Noise
Density
Path
Amplitude
Range
Average Noise Density
Average Noise
Density at small
amplitudes is
limited by a
–148 dBm/Hz
noise floor.
V
pk-pk
dBm dBm/Hz
dBFS/
Hz
Direct 1 4.0 18 –142 –146.0
Low Gain 0.06 –20.4 9 –148 –127.6
Low Gain 0.1 –16.0 9 –148 –132.0
Low Gain 0.4 –4.0 13 –145 –141.0
Low Gain 1 4.0 18 –142 –146.0
Low Gain 2 10.0 35 –136 –146.0
High Gain 4 16.0 71 –130 –146.0
High Gain 12 25.6 213 –120 –145.6
Intermodulation
Distortion (IMD)
Path Each tone is
–7 dBFS.
All values
are typical.
Direct
Low-Gain
Amplifier
High-Gain
Amplifier
10.2 MHz and
11.2 MHz
–81 dBc –80 dBc –62 dBc
10.6 MHz and
10.8 MHz
–81 dBc –79 dBc –61 dBc
19.5 MHz and
20.5 MHz
–78 dBc –66 dBc –54 dBc
19.9 MHz and
20.1 MHz
–78 dBc –65 dBc –50 dBc
34.0MHz and
35.0 MHz
–75 dBc –58 dBc –51 dBc
34.8 MHz and
35.0 MHz
–75 dBc –58 dBc –51 dBc
42.0 MHz and
43.0 MHz
–75 dBc –55 dBc –51 dBc
42.8 MHz and
43.0 MHz
–75 dBc –55 dBc –50 dBc
Table 1. (Continued)
Specification Value Comments
nV
Hz
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