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CMU Output Level Test Uncertainty

This document calculates the uncertainty for a CMU output level test at -130 dBm with a 3 second measurement time. It lists various sources of uncertainty including the powermeter, noise, zero error, calibration uncertainty, temperature effects, linearity, mismatch, S21 measurement accuracy, switching reproducibility, and signal to noise ratio. The combined standard uncertainty is calculated to be 0.1321 dB and the expanded combined uncertainty at a 95% confidence level is 0.2590 dB.

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116 views1 page

CMU Output Level Test Uncertainty

This document calculates the uncertainty for a CMU output level test at -130 dBm with a 3 second measurement time. It lists various sources of uncertainty including the powermeter, noise, zero error, calibration uncertainty, temperature effects, linearity, mismatch, S21 measurement accuracy, switching reproducibility, and signal to noise ratio. The combined standard uncertainty is calculated to be 0.1321 dB and the expanded combined uncertainty at a 95% confidence level is 0.2590 dB.

Uploaded by

عبدالعزيز بدر
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLS, PDF, TXT or read online on Scribd
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Uncertainty Calculation for CMU Output Level Test @ -130 dBm and 3 s meas.

time

A B C D

Intermediate Standard Uncertainty


1 Level measurement uncertainty calculation, assumption: DUT Data
results in dB (1 s).
does not change output VSWR below -40 dBm
2
3 Uncertainty due to Powermeter/NRV-Z4 to 2 GHz
4 at Level in dBm -40 1.000E-07
5
6 Noise in pW (with filter No. 3, 2s ) 320 3.20E-10
7 Standard Uncertainty 0.0070
8
9 Zero Error in pW (rectangular distribution) 50 0.00217
10 Standard Uncertainty 0.0013
11
12 Calibration Uncertainty (2s) in dB 0.06
13 Standard Uncertainty 0.0300
14
15 Linearity Error in % Power (2s) 0.7
16 Standard Uncertainty 0.0152
17
18 Temp. Effect 18° to 28° in % Power (1s) 0.3
19 Standard Uncertainty 0.0130
20
21 Powermeter Acc. In % Power (rectangular distribution) 0.3
22 Standard Uncertainty. 0.0075
23
24 Sum Uncertainty Powermeter 0.0375
25
26 Uncertainties due to mismatch:
27 Mismatch at D.U.T output-Switch
28 VSWR of D.U.T 1.5
29 S11 of Switch 1.1
30 Standard Uncertainty. 0.0586
31
32 Mismatch at powersensor-switch
33 VSWR Sensor 1.1
34 S22 of Switch 1.1
35 Standard Uncertainty. 0.0139
36
37 Uncertainty due to Mismatch D.U.T Output-powersensor
38 VSWR DUT 1.5
39 VSWR SENSOR 1.1 0.0529
40 Standard Uncertainty.

41
Sum Standard Uncertainty due to mismatch (measurement
with NRV-Z4). 0.0801
42
43

44 Uncertainty S21 Measurement of path d.u.t to sensor in


dB(rectangular distribution) 0.05
45 Standard Uncertainty. 0.0289
46
47 Linearity Error of FSP at digital BW
48 Specification in dB (Special calibration) 0.2
49 Standard Uncertainty. 0.0700
50
51 Uncertainty due to reproducability of Switching
52 Level in dB (rectangular distribution) 0.03
53 Standard Uncertainty 0.0173
54
55 Uncertainty due to S/N at -110 dBm (without Low Noise Amp)
56 Measured standard uncertainty in dB with 3 s meas. time 0.06 0.0600
57
58
59 Combined Standard Uncertainty in dB 0.1321
60

61 Expanded Combined Standard Uncertainty in dB


(95% Confidence) 0.2590

381214492.xls Seite 1 Minihold 1MAA

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