dbx 463X - Page 22

11.
Verify
that all
DE
LEDs
are now
off.
12.
Set
Threshold
control CW
and
verify
that
all
DE
LEDs
now
on
(
+
/-
1 LED).
13.
Increase
the
oscillator
level
until
all
the
DE
LEDs are
off
and
the
Threshold
LED
is
off.
14. Verify
that
the
oscillator
level
Is now
13dBv
(/-
5dB).
14a.
Slowly
decrease
the
oscillator
level
and
verify
that the
DE LEDs
turn
on
one
LED
at
a
tine
until all
DE
LEDs
are
on.
15.
Remove
the
oscillator
connection
from
the
Key
In
jack.
16. Rotate
the
Threshold
control
CCW
until
the
Threshold
LED turns
on.
17. Verify
that
the
Indicator
dot
on
Threshold
control
Is
now
between
the
-60
"and
-70
markings
on the
front
panel.
F.
More
Range
Check:
1.
Set
the
Threshold
control CW.
2.
Set
the More
control
full right.
3.
Verify
that
all
the
DE LEDs
are
now
lit.
4.
Set
the
More
control
to midposition
(indicator
line
on the
More
control
must
be
between the
-20
and
-25
DE
LEDs.
5.
Verify
that
the
rightmost
6
DE
LEDs are
lit (+/-
1 LED).
6.
Set
MORE
control
full
left.
7.
Verify
all
DE
LEDs
now off.
G.
Noise
Check:
1.
Remove
any
connections
from
the
Input
jacks.
2.
Set
the
More
slider
fully
left
and
the
Threshold
control
CCW.
3.
Connect
ac
voltmeter
to
the rear
panel
Output
jack
and
verify that
the
noise
level
Is
less
than
-80dBv.
Use
a
20Hz
to
20kHz
bandwidth filter, if
availabe,
on
the
Input
to
the
meter
for
a more
accurate
reading.
4.
If
an ’A'
weighting
filter
Is availably
connect
it to the
Input of
the
meter
and
verify
the
noise
level
to now
be
less
than
-85dBv.
H.
Frequency
Response
Check:
1- Set
oscillator
for
O.OdBv
at 1kHz
and
connect
to
rear
panel Input
jack.
2.
Connect
ac
voltmeter
to
rear
panel
Output
jack.
(Be sure
to
remove
any
filters
if
used
In
the
Noise
Check.)
3.
Set
the
More
slider
fully
left.
4. Set
oscillator
to 20H2
and
verify
that
the
meter
reads
O.OdBv
(*/-
ldB).
6.
Repeat
step
5
for
100Hz,
10kHz,
and
20kHz.