XYLENE POWER LTD.

POWER LINE CARRIER LIGHTING CONTROL

CALIBRATION OF NOISE MEASUREMENT APPARATUS

EXPERIMENTALLY MEASURED [Tm(F)]^2 AS A FUNCTION OF FREQUENCY F FOR NOISE MEASUREMENT APPARATUS

F(kHz)---	Tm(F)---	[Tm(F)]^2---
0	.015
5	.015	.000225
10	.015	.000225
15	.015	.000225
20	.016	.000256
25	.016	.000256
30	.017	.000289
35	.018	.000324
40	.019	.000361
45	.019	.000361
50	.021	.000441
51
52
53
54
55	.023	.000529
56
57
58
59
60	.023	.000529
61
62
63
64
65	.026	.000676
66
67
68	.027
69
70	.028	.000784
71
72
73
74
75	.030	.000900
76
77
78
79
80	.033	.001089
81
82
83
84
85	.037	.001369
86
87	.039
88
89
90	.041	.001681
91
92
93
94
95	.046	.002116
96
97
98
99
100	.051	.002601
101	.052
102
103
104
105	.060	.003600
106	.063	.003969
107	.065
108	.069
109	.070
110	.074	.005476
111	.075
112	.080	.006400
113	.085
114	.090	.008100
115	.095	.009025
116	.101	.010201
117	.109
118	.115	.013225
119	.126
120	.135	.018225
121	.146
122	.160	.025600
123	.175
124	.188	.035344
125	.200	.040000
126	.209	.043681
127	.213
128	.213	.045369
129	.211
130	.206	.042436
131	.200
132	.193	.037249
133	.185
134	.179	.032041
135	.171	.029241
136	.161	.025921
137	.154
138	.148	.021904
139	.143
140	.134	.017956
141	.128
142	.123	.015129
143	.119
144	.114	.012996
145	.109	.011881
146	.105	.011025
147	.101
148
149
150	.091	.008281
151
152	.085	.007225
153
154
155	.078	.006084
157	.074
160	.070	.004900
162	.067
165	.063	.003969
167	.060
170	.057	.003249
172	.055
175	.053	.002809
177	.051
180	.049	.002401
182	.047
185	.046	.002116
187	.045
190	.043	.001849
192	.042
195	.041	.001681
197	.041
200	.040	.001600
202	.039
205	.038	.001444
207	.037

Integrating the area under the curve gives:
Integral{[Tm(F)]^2}dF = .231782 X 5 kHz = 1.1589 kHz

Recall that:
[Vnm]^2=[(Vb)^2]Integral{[Tm(F)]^2}dF

Hence, for a measured value of RMS voltage Vnm at the noise measurement interface output the quantity (Vb)^2 is easily evaluated using:
(Vb)^2 = [Vnm]^2/Integral{[Tm(F)]^2}dF
= [Vnm]^2 / 1.1589 kHz

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This web page last updated September 20, 2005