04 | Keysight | N4000A, N4001A, N4002A SNS Series Noise Sources - Technical Overview

Accurate Noise Power

The output of a noise source, usually given in terms of Excess Noise Ratio (ENR), must

be known in order to make accurate noise figure measurements. Any uncertainty in the

ENR transfers into uncertainty of the measured noise figure, dB for dB. Keysight provides

accurate ENR calibration data with each noise source. ENR uncertainty and reflection

coefficients at each frequency point are provided as well.

The following is an example of calibration data for an N4001A noise source:

# ENR Data File

# Created by N8975A NFA Series Noise Figure Analyzer

# Serial Number GB40390000 Firmware Revision A.01.01

# 13:37:07 Mar 28, 2001

# Format is: Frequency (Hz), ENR (dB), ENR Unc (dB), # On Refl.Mag (lin), On Refl.Phase (deg),

# Off Refl.Mag (lin), Off Refl.Phase (deg) , # On Refl.Mag Unc (lin), On Refl.Phase Unc (deg),

# Off Refl.Mag Unc (lin), Off Refl.Phase Unc (deg)

[Filetype ENR]

[Version 1.1]

[Serialnumber US41240152]

[Model N4001A]

[Option 001]

[Caldate 20000727]

[Calduedate 20010727]

[Placeofcal EPSGQ]

[Trackingnum 10]

[Temperature 296.5K]

[Humidity 65%]

[Current 36272]

10000000,

15.281, 0.193,

0.0450, –136.0, 0.0450, –136.0, 0.0030, –6.0,

0.0070, +6.0,

100000000,

15.291, 0.190,

0.0358, +168.0, 0.0358, +168.0, 0.0040, +4.6,

0.0050, –4.6,

1000000000,

15.118, 0.151,

0.0398, +39.6,

0.0398, +39.6,

0.0100, +4.5,

0.0067, +1.5,

2000000000,

14.999, 0.168,

0.0377, 0.168,

0.0377, –85.7,

0.0056, +0.9,

0.0086, +1.9,

3000000000,

14.879, 0.172,

0.0267, +150.6, 0.0267, +150.6, 0.0080, –9.2,

0.0090, –1.2,

4000000000,

14.795, 0.173,

0.0130, –18.1,

0.0130, –18.1,

0.0013, +16.0,

0.0063, +10.0,

5000000000,

14.818, 0.179,

0.0359, +169.5, 0.0359, +169.5, 0.0024, –9.3,

0.0035, –0.3,

6000000000,

14.846, 0.181,

0.0556, +63.7,

0.0556, +63.7,

0.0041, +10.3,

0.0067, –4.3,

7000000000,

14.895, 0.180,

0.0430, –37.0,

0.0430, –27.0,

0.0079, –2.3,

0.0049, –2.3,

8000000000,

15.016, 0.198,

0.0232, –160.3, 0.0232, –160.3, 0.0091, –3.8,

0.0053, –1.8,

9000000000,

15.134, 0.201,

0.0122, +71.4,

0.0122, +71.4,

0.0037, +17.3,

0.0057, +7.3,

10000000000,

15.253, 0.194,

0.0080, +116.2, 0.0080, +116.2, 0.0048, –1.4,

0.0056, –5.4,

11000000000,

15.249, 0.243,

0.0241, +65.7,

0.0241, +65.7,

0.0059, +1.5,

0.0049, +44.5,

12000000000,

15.349, 0.240,

0.0196, +8.8,

0.0196, +8.8,

0.0057, +3.2,

0.0077, +2.2,

13000000000,

15.383, 0.188,

0.0217, –5.4,

0.0217, –5.4,

0.0062, –6.9,

0.0045, –1.9,

14000000000,

15.355, 0.178,

0.0228, –66.6,

0.0228, –66.6,

0.0075, +11.2,

0.0065, +1.2,

15000000000,

15.367, 0.187,

0.0141, +141.6, 0.0141, +141.6, 0.0036, –3.2,

0.0029, –1.2,

16000000000,

15.421, 0.182,

0.0251, +6.4,

0.0251, +6.4,

0.0030, +7.2,

0.0042, –1.2,

17000000000,

15.418, 0.174,

0.0242, –100.5, 0.0242, –100.5, 0.0048, –2.7,

0.0050, +9.7,

18000000000,

15.464, 0.179,

0.0183, +124.4, 0.0183, +124.4, 0.0098, –1.1,

0.0100, +9.1,