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4.2 DISTURBANCE POWER MEASUREMENT 

 

4.2.1 LIMITS OF DISTURBANCE POWER 

 

 

Limit values 

dB(μV) 75Ω 

Equipment type 

Frequency 

MHz 

Quasi-peak 

Average 

Associated equipment   

(video recorders excluded)

 

30 to 300 

45 to 55

 a

 

35 to 45

 a

 

a

 Increasing linearly with the frequency. 

 

 

 Notes: 
 

(1). lf the limits for the average detector are met when using the quasi-peak detector, 

the limits for the measurements with average detector are considered to be met. 

 
 

4.2.2 MEASUREMENT INSTRUMENTS LIST 

   

Item  Kind of Equipment 

Manufacturer 

Type No. 

Serial No. 

Calibrated until 

1 Absorbing 

Clamp 

R&S 

MDS-21 

3985 

Nov.08.2011 

2 Test 

Cable 

N/A 

C-04_Clamp

N/A 

Jul.06.2011 

3 Amplifier 

HP 

8447D 

1937A02847 

May.26.2011 

4 Attenuator  BroadWave 

Tech 

352-057-006

N/A 

Jul.06.2011 

5 Test 

Receiver 

R&S 

ESCI 

100895  May.26.2011 

 

  Remark: ” N/A” denotes No Model Name / Serial No. and No Calibration specified. 

 
 

4.2.3 TEST PROCEDURE 

a. The EUT was placed on the top of a rotating table 0.8 meters above the ground at a 3 meter 

chamber room. The table was rotated 360 degrees to determine the position of the highest 
radiation. 

b. The EUT was set 3 meters away from the interference-receiving antenna, which was mounted 

on the top of a variable-height antenna tower. 

c. The antenna is a broadband antenna, and its height is varied from one meter to four meters 

above the ground to determine the maximum value of the field strength. Both horizontal and 
vertical polarizations of the antenna are set to make the measurement. 

d. For each suspected emission, the EUT was arranged to its worst case and then the antenna 

was tuned to heights from 1 meter to 4 meters and the rotatable table was turned from 0 
degrees to 360 degrees to find the maximum reading. 

e. The test-receiver system was set to quasi-peak detect function and specified bandwidth with 

maximum hold mode when the test frequency is below 1 GHz. 

f.  Mode Optical IN test is not applicable in this Test Report 
Note: 

1. The resolution bandwidth and video bandwidth of test receiver/spectrum analyzer is 120kHz 

for Quasi-peak detection (QP) at frequency below 1GHz. 

 

 

 

 

 

 

 

 

 

4.2.4 DEVIATION FROM TEST STANDARD 
No deviation   

 

4.2.5 TEST SETUP-CLAMP 

 

4.2.6 BLOCK DIAGRAM OF TEST SETUP-CLAMP 

EUT-1

Test Receiver

DVD

AC

 Mains

Audio Cable

EUT-2

AC

 Mains

Clamp

Remote

Fiber Cable

 

 

4.2.7 EUT OPERATING CONDITIONS 
The EUT tested system was configured as the statements of 4.1.7  Unless otherwise a special 
operating condition is specified in the follows during the testing. 

 

 

 

 
 

 

 

 

 

4.2.8 TEST RESULTS 

 

E.U.T : 

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powered woofer   

Model Name : 

SB300 

Temperature : 

25°C 

Relative Humidity : 

50 % 

Pressure : 

1010 hPa 

Test Voltage : 

AC 230V/50Hz 

Test Mode : 

AUX IN/ AC Cable    Woofer ,TianBao 

 

Freq.

Factor(CF)

Measured(dBuV)

Limits(dBuV)

Safe Margins

(MHz)

QP

AV

(dB)

QP-Mode AV-Mode QP-Mode AV-Mode (dBuV)

Note

30.00

47.37

0.00

-14.44

32.93

-14.44

45.00

35.00

-12.07

36.75

49.55

0.00

-17.26

32.29

-17.26

45.25

35.25

-12.96

101.55 51.21

0.00

-17.70

33.51

-17.70

47.65

37.65

-14.14

111.00 55.44

54.71

-19.13

36.31

35.58

48.00

38.00

- 2.42

AV

135.30 55.09

0.00

-19.04

36.05

-19.04

48.90

38.90

-12.85

233.85 46.20

0.00

-18.81

27.39

-18.81

52.55

42.55

-25.16

Read

(RA)(dBuV)

 

 

Remark:  

(1) Reading in which marked as QP or Peak means measurements by using are Quasi-Peak 

Mode or Peak Mode with Detector BW=120KHz；SPA setting in RBW=120KHz, VBW 
=120KHz, Swp. Time = 0.3 sec./MHz。 

(2) All readings are Peak unless otherwise stated QP in column of『Note』. Peak denotes 

that the Peak reading compliance with the QP Limits and then QP Mode measurement 
didn‘t perform。 

(3) Measuring frequency range from 30MHz to 300MHz。 
(4) If the peak scan value lower limit more than 20dB, then this signal data does not show 

in table。 

 

 
 
 
 
 

 

 

 

 
 
 

E.U.T : 

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powered woofer   

Model Name : 

SB300 

Temperature : 

25°C 

Relative Humidity : 

50 % 

Pressure : 

1010 hPa 

Test Voltage : 

AC 230V/50Hz 

Test Mode : 

AUX IN/ AC Cable    Woofer ,HanWei 

 

Freq.

Factor(CF)

Measured(dBuV)

Limits(dBuV)

Safe Margins

(MHz)

QP

AV

(dB)

QP-Mode AV-Mode QP-Mode AV-Mode (dBuV)

Note

30.00

51.16

38.54

-14.44

36.72

24.10

45.00

35.00

- 8.28

71.17

54.90

39.21

-18.59

36.31

20.62

46.52

36.52

-10.21

86.03

56.24

49.28

-18.45

37.79

30.83

47.08

37.08

- 6.25

AV

92.10

55.48

40.52

-18.14

37.34

22.38

47.30

37.30

- 9.96

111.00

55.44

52.52

-19.13

36.31

33.39

48.00

38.00

- 4.61

AV

135.30

56.31

54.44

-19.04

37.27

35.40

48.90

38.90

- 3.50

AV

Read

(RA)(dBuV)

 

 

Remark:  

(1) Reading in which marked as QP or Peak means measurements by using are Quasi-Peak 

Mode or Peak Mode with Detector BW=120KHz；SPA setting in RBW=120KHz, VBW 
=120KHz, Swp. Time = 0.3 sec./MHz。 

(2) All readings are Peak unless otherwise stated QP in column of『Note』. Peak denotes 

that the Peak reading compliance with the QP Limits and then QP Mode measurement 
didn‘t perform。 

(3) Measuring frequency range from 30MHz to 300MHz。 
(4) If the peak scan value lower limit more than 20dB, then this signal data does not show 

in table。