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RÄlox"
MR8
E28
4.6.4
Channel
separation
.
With
the audio
generator
leed
1
kHlO
dBu (775 mVrms)
to the
unbalanced
STEREO L [ad] input
left of the first
input module.
.
Terminate the unbalanced STEREO
R
[ad]
input
right
with a
1
kohms
resistor.
.
Connect
the voltmeter
to the
MASTER
OUTPUT BALANCED [18] left (range
10
dB/3
v).
.
Set
the input selector
[a]
to
the STEREO
position.
.
Set
the
input
fader and the master
lader
[h and m]
to the 0 dB
position.
.
Set
the slide switch [16] for the master output level to the 6 dBu position.
.
With
the input
level
control [b] align to +6 dBu (1.55 Vrms).
.
Connect
the voltmeter to
the
MASTER
OUTPUT BALANCED [18]
rlght'
.
The measured
cross talk should
be
>
5O
dB.
.
Repeat
the measurement with swapped
channels'
.
ll
the
input
fader [h] is set to the
*
posilion,
the switch-off attenuation
is
> 85
dB.
lf
in place of the input fader the master fader [m] is set to the
*
position,
the swilch-off attenuation is >90
dB.
4.6.5 Signal-to-noise ratio
.
With
the audio
generator
feed 1 kHlO dBu (775 mVrms) to the
unbalanced
STEREO L [ad] input left of the first input module.
.
Connect
the vottmeter
to the
MASTER
OUTPUT BALANCED [18] left (range
10
dB/3
V).
.
Set
the
input
selector [a] to
the STEREO
position.
.
Set
the
input
fader and the master fader to the
0
dB position.
.
Set
the slide switch [16]
lor the master output
level
to the 6 dBu position.
.
With
the input
level
control
[b]align to +6 dBu
(1.55 Vrms).
.
Connect
the vottmeter to
the
MASTER
OUTPUT BALANCED [18]
right.
.
Disconnect
the audio generator from
the
input and terminate
the
input
with
a
1
kohms resistor.
.
The measured
signal-to'noise ratio
should be
>
100
dB.
.
Repeat
the
measurement
with
the
right-hand channel.
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