Electro-Voice Dx38, Руководство по обслуживанию

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3
13.2 Comments about measurements
- Unless differently stated, all measurement has been performed at 20°C
±
2°C
- All stated levels
±
1 dB
[1] all controls set to their clockwise margin
[2] Service program 'SINE WAVE OUT' , set a level of 0 dB,
Output voltage = approx. 8,9 V = +21 dBu = 0 dBr,
+ and - outputs summed via 10 k
Ω
/ 0,1 % resistors, with VR301 ... VR601
adjusted for minimum levels U
≤
87 mV = -19 dBu = -40 dBr
[3] measured with service program 'ORIGINAL THRU' , level 0 dB, all controls set to their
clockwise margin, input level +10 dBu
[4] measured with service program 'ORIGINAL THRU' , level 0 dB,
input controls at center position, output controls set to their clockwise margin
[5] measured with service program 'ORIGINAL THRU' , level 0 dB, all controls
set to their clockwise margin,
measurement via bandpass filter 22 Hz ... 22 kHz, weighting filter set to 20 kHz Lo-Pass,
Q-Peak, input terminated with 600
Ω
[6] measured with service program 'ORIGINAL THRU' , level 0 dB, all controls
set to their clockwise margin,
measurement via bandpass filter 22 Hz ... 22 kHz, weighting filter set to CCIR 468-3,
Q-Peak, input terminated with 600
Ω
[7] measured with service program 'ORIGINAL THRU' , level 0 dB, all controls
set to their clockwise margin,
measurement via bandpass filter 22 Hz ... 22 kHz, weighting filter set to 'A-weighting',
RMS, input terminated with 600
Ω
Figure 1 Frequency Response [dBr] [3]
0 4 / 0 9 / 9 9 1 2 : 2 8 : 1 4 F r e q u e n c y r e s p o n s e
-3
+ 1
-2.5
-2
-1.5
-1
-0.5
-0
+ 0 . 5
d
B
r
2 0 2 0 k 5 0 1 0 0 2 0 0 5 0 0 1 k 2 k 5 k 1 0 k
H z