Manual-2
FRONT PANEL DESCRIPTION
1
SIGNAL LEDs:
illuminate green 34 dB before clipping.
2
SENSITIVITY controls:
vary incoming signal levels to the A to D converter. The output signal is also adjusted so the AD 22d
always passes signal with unity gain.
(See operating instructions.)
3
CLIP LEDs:
illuminate red 4 dB before clipping at the A to D converter input.
4
BYPASS buttons & LEDs:
These momentary push buttons toggle each channel’s hard-wired Bypass. If an LED is
on,
the given
channel is Bypassed and functions like a wire. If it is
off
the given channel is active.
5
STORE LED:
flashes green when the current configuration of the AD 22d is different from the stored configuration. The
STORE LED is
off
when the current configuration matches the stored configuration.
6
STORE button:
Stores the current Delay configuration into both channel’s current Memory (A or B). The current Memory for
each channel is indicated by the MEMORY LED which is lit when editing that channel.
7
MEMORY LEDs:
indicate the most recently recalled Memory, A or B, for each channel by illuminating yellow. They also indi-
cate the Memory that is written to when the STORE button is pressed. The MEMORY LED flashes when the
current
Delay value
for the selected channel is
different
than the
stored
value for the selected channel.
8
RECALL button:
Pressing this pushbutton alternately Recalls stored Memories A and B, for the channels(s) indicated by the
green CHAN LEDs.
9
CHANNEL LEDs:
indicate the channel number whose value is currently being displayed in the LED display and whose current
Delay value is editable by illuminating green. If
both
CHAN LEDs are
on
, both channel’s current Delay values are editable. In this
edit
BOTH
mode, the LED display shows the
smaller
of the two current Delay values and the memory LEDs turn
off
if the two
channel’s current Memories are not the same.
0
CHANNEL button:
Pressing this button advances the channel LEDs from CHAN 1 to CHAN 2 to BOTH. The current Delay
value of the selected channel is displayed in the LED display.
q
DISPLAY MODE button & LEDs:
This button changes the units of displayed Delay values from Milliseconds to Feet to Meters.
The LEDs indicate the current Display Mode: MILLISECONDS, FEET or METERS.
w
5-digit LED display:
indicates the current Delay value for the selected channel. When both channels are selected, the
smaller
of
the two channel’s current Delay values is displayed. This display also shows the current temperature setting when holding down
the DISPLAY MODE button and pressing one of the up/down buttons. On power-up the current software revision is displayed.
e
UP/DOWN buttons:
Pressing these buttons increases/decreases the amount of Delay in the selected Channel(s). The two buttons
just to the right of the LED display change Delay
time
in 1 millisecond steps. The far right buttons provide 10 microsecond steps.
For distance displays (feet and meters), these buttons are FINE and COARSE adjustments, since Delay increments are always in 1
msec and 10 µsec steps, regardless of the DISPLAY MODE.
r
TEMPERATURE setting:
Holding down DISPLAY MODE while pressing the up/down buttons displays the current tempera-
ture setting in degrees Celsius for the 1 msec/COARSE buttons and degrees Fahrenheit for the 10 µsec/FINE buttons. Further
up/down presses change the temperature setting. No matter which unit (°C or °F), adjustments are always in 1°C steps (or 1.8°F).
BYPASS
1
STORE RECALL CHAN
MILLISECONDS
MODE
MEMORY
2
A B
DISPLAY
2
1
1 ms
10
μ
s
1
2
SIGNAL
CLIP
dBu
SIGNAL
SENSITIVITY
SENSITIVITY
CLIP
dBu
0
-16
+4
-20
-4
-12
-8
0
-16
+4
-20
-4
-12
-8
AD 22d
METERS
FEET
AUDIO DELAY
-10 dBV
-10 dBV
HOLD TO SET TEMP
COARSE
FINE
°C
°F
2
3
1 2
1
3
6
4
9
12
13
14
11
5 7
8 10
