USL MMP-10 - Manual (Page 6)

MMP-10 I
NSTRUCTION
M
ANUAL
U
LTRA
★ S
TEREO
L
ABS
, I
NC
.
- 6 -
The first time you use your new MMP-10, you should set the output
level to match the single microphone supplied with your analyzer. To
accomplish this find a suitable location and set up your analyzer with
its own microphone.
Using pink noise through the sound system, adjust the amplifier level
to produce a normal display (85 dbC). Next disconnect the analyzer
microphone and connect the MMP-10 (with its four microphones) to
the analyzer.
Open the MMP-10 back cover. Select microphone one and adjust the
overall potentiometer R# 45 inside the MMP-10 to achieve the same
level on your analyzer display as measured with the analyzer micro-
phone. Verify that the remaining three microphones have the same
reading.
(Note: it is not necessary to adjust individual trim potentiometers, R10,
R20, R30, R40, as these are adjusted at the factory.)
Switch the MMP-10 to scan mode and observe the display of all four
microphones. Different analyzers will integrate this switched signal in
various ways. Adjust the scan rate potentiometer, R60, to achieve a
smooth stable display. If the timing is too slow, the display will
bounce.
Initial Calibration
R48 R49 R50 R51
4520
4052
34184
34184
34184
R64
401
1
401
1
401
1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R40
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
R41
R42
R43
R44
R45
R46
R47
R52
R53
R54
R55
R56
R57
R58 R59
R60
R61
R62
C21
C22
C23
C24
C25
C26
C27 C28 C29
C30 C31 C32 C33
C34
S1
D1
D2 D3 D4 D5
U1 U2
U3
U4
U5 U6 U7 U8
B1
MIC1 MIC2 MIC3 MIC4
OUT
FREQ
- + - + - + - + - + P P P P E
OUT
3 2 1 4
USL, INC. TARZANA, CA
MIC MULTIPLEXER MMP-10B
R63
U9
C35
R54
R55
R54
R55
9v
Acme Battery Corp.
Steekingdesert, New Mexico.
Level
Micr. Trims
Freq. Scan