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11-Feb-13
RDR-91 12 V, 1 A, Universal Input Supply
14 Audible Noise
An open-frame (no enclosure) unit was tested with an Audio Precision Analyzer, using a
microphone positioned one inch from the core of transformer T1. The test was done with
the unit in an acoustically isolated and dampened chamber. The load was adjusted until a
maximum reading was obtained.
35 dBrA is considered the acceptable limit for frequencies below 18 kHz. An enclosure
will typically further reduce measurable acoustic noise levels by an additional 10 dBrA.
Audio Precision
+80
+70
+60
+50
+40
08/17/05 15:04:17
Audio Precision
+80
+70
+60
+50
+40
08/17/05 15:11:39
d
B
r
A
+30
+20
+10
+0
-10
-20
d
B
r
A
+30
+20
+10
+0
-10
-20
-30
0
2k
4k
6k
8k
10k
Hz
12k
14k
16k
18k
20k
22k
-30
0
2k
4k
6k
8k
10k
Hz
12k
14k
16k
18k
20k
22k
Color
Green
Line Style
Solid
Thick
1
Data
Fft.Ch.1 Ampl
Axis
Left
Color
Green
Line Style
Solid
Thick
1
Data
Fft.Ch.1 Ampl
Axis
Left
Arts_audionoise1.at2
Figure 29 – Audible Noise V IN = 120 VAC;
I OUT = 350 mA.
Arts_audionoise1.at2
Figure 30 – Audible Noise V IN = 120 VAC;
I OUT = 1 A.
Audio
+80
+70
+60
+50
+40
08/17/05
Audio Precision
+80
+70
+60
+50
+40
08/17/05 15:09:38
d
B
r
A
+30
+20
+10
+0
-10
-20
d
B
r
A
+30
+20
+10
+0
-10
-20
-30
0
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
-30
0
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
Hz
Hz
Color
Green
Line Style
Solid
Thick
1
Data
Fft.Ch.1 Ampl
Axis
Left
Color
Green
Line Style
Solid
Thick
1
Data
Fft.Ch.1 Ampl
Axis
Left
Arts_audionoise1.at2
Figure 31 – Audible Noise V IN = 230 VAC;
I OUT =1 A.
Arts_audionoise1.at2
Figure 32 – Audible Noise V IN = 230 VAC;
I OUT =1.2 A.
Note: Shaded area obscured due to ambient noise.
Power Integrations
Page 31 of 35
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