Crystal Vision AADA416FR User manual

AADA416FR
Analogue Audio Distribution Amplifier
Crystal Vision Ltd., Lion Technology Park, Station Road East, Whittlesford, Cambridge, CB22 4WL, England.
Tel: [phone] Fax: [phone] [e-mail] www.crystalvision.tv

Crystal Vision AADA416FR User Manual
Contents
1Introduction 3
2Hardware installation 5
2.1 Rear modules and signal I/O 5
2.2 Using unbalanced audio 8
2.3 General purpose interface 9
2.4 Configuration 12
Monitoring output 13
Linking audio channels together 13
Changing the maximum operating level 15
3Card edge operation 17
Audio gain 18
Overvoltage detection level 18
Silence detection level 18
4Using the active front panel 20
Selecting the AADA416FR 21
Navigating the display 21
Using the shaft encoder 22
4.1 The AADA416FR active panel menu structure 22
Shorthand codes 23
4.2 Adjusting channel gain 23
4.3 Channel status 23
4.4 Adjusting alarm settings 24
4.5 Configuring GPI outputs 25
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5Statesman 26
5.1 Statesman operation 26
5.2 Controlling audio channel gain 27
5.3 Setting error and GPI options 28
6Trouble shooting 30
7Specification 32
Revision 3 Correction to RM37 diagram box, page 7 05/11/07
Revision 4 RM37 connection tables updated, pages 7-8 16/11/07
Revision 5 Power consumption and O/P specifications updated, 07/08/08
page 33
Revision 6 Amendment to Specification table, page 33-34 08/08/08
Revision 7 RM37 phasing amended (page 10) 25/11/09
Revision 8 RM37 Audio out table amended (page 8) 02/03/10
Revision 9 RM17 connection table amended (page 6) 23/01/14
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Crystal Vision Introduction
1 Introduction
The AADA416FR quad audio distribution amplifier with individually balanced floating
outputs can be used in either local or remote modes and can be configured in a variety of
input/output configurations.
Audio gain is adjustable to suit operating levels of 18dBu*, and 24/28dBu with the
provision of on-board movable PCB header blocks.
Continuous variable control of level is available from the card edge in local mode, from
an active control panel in remote mode and from Statesman.
AADA416FR quad distribution amplifier
The AADA416FR can be configured in any of the following modes:
•4 channels - each channel is 1-in 4-out
•3 channels - channels 1 and 2 are 1-in 4-out; channel 3 is 1-in 8-out
•2 channels - channels 1 and 3 are 1-in 8-out
•2 channels - channel 1 is 1-in 4-out; channel 2 is 1-in 12-out
•1 channel - channel 1 is 1-in 16-out
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Each channel has an audio silence detector with 16 different user adjustable time settings.
Note:
The maximum input signal level is +28dBu and the maximum output level is +25dBu.
The silence detect delay is selectable from around 2 seconds to 120 seconds in 15 8
seconds steps. Its default value is 56 seconds.
The silence threshold level can be adjusted from -18dBu to -42dBu and its default value is
–30dBu.
Each channel also has an overvoltage detector that can be adjusted from +6dBu to
+25dBu. The default value is +25dBu.
The AADA416FR has LED and GPI indication of audio silence and overvoltage status
for each channel. General Purpose Interface (GPI) lines are also provided to indicate
audio silence/overvoltage status.
Two 3.5mm jacks are provided for local audio monitoring using headphones.
The main features are as follows:
•Quad audio distribution amplifier with five configuration modes
•Suitable for operating levels of 18dBu and 24dBu/28dBu to European levels
(+18/+24 dBu)
•Per channel silence detection with adjustable threshold level and duration
•Per channel overvoltage detector with adjustable threshold level
•Electronically balanced inputs and outputs
•Headphone monitoring for all channels
•GPI silence/overvoltage indication
•Easy unity gain calibration mode
•Card edge, active/remote panel and Statesman control options
The AADA416FR is a 100mm x 266mm module, which fits in the three standard frames
and can be integrated with any boards from the company’s full product range. It uses the
RM17 and RM37 single height rear connectors.
Note:
This manual covers the AADA416FR. The AADA416FM, without remote control, is also
available.
The maximum input signal level is +28dBu and the maximum output level is +25dBu.
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2 Hardware installation
The AADA416FR quad distribution amplifier fits into all Crystal Vision rack frames. All
modules can be plugged in and removed while the frame is powered without damage.
2.1 Rear modules and signal I/O
The AADA416FR is used with the RM17 and the RM37 “easywire” single slot rear
connectors in all Crystal Vision frames.
The 4U Indigo 4 frame will house up to 24 modules and triple power supplies.
The 2U Indigo 2 frame will house up to 12 modules and dual power supplies.
The 1U Indigo 1 frame will house 6 modules and a single power supply.
The 1U Indigo DT desk top box has a built-in power supply and will house up to 2
modules.
On the 1U, 2U and 4U frames a hinged front panel gives access to the PSU and all
modules. The desk top box has a removable front. The universal frame wiring system
allows any of the interface range of modules to be fitted in any position with the use of
removable rear modules.
RM17 rear module connections
RM17 fits in all frames
Description
RM17 (ZLA00099 artwork)
•24 modules per 4U frame, 12
per 2U frame, 6 per 1U frame
& 2 per desk top box
•All frame slots can be used
For details of fitting rear connectors please refer to the appropriate frame manual.
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Audio in - 15 pin D-Type connector (cable has plug on it)
Pin number Function Comments
1 IP-1LO Screen for input 1
2 IP-R1+ }Stereo 1 Right input (Audio 1 )
3 IP-R1-
4 IP-R3+ }Stereo 2 Right input (Audio 3 )
5 IP-R3-
6 IP-2LO Screen for input 2
7 N/C
No connection
8 N/C
9 IP-L2+ }Stereo 1 Left input (Audio 2 )
10 IP-L2-
11 IP-L4+ }Stereo 2 Left input (Audio 4 )
12 IP-L4-
13 GND (Chassis )
14 IP-3LO Screen for input 3
15 IP-4LO Screen for input 4
Note:
Stereo 1 channel uses audio 1 for right signal (R1) and audio 2 for left signal (L1).
Stereo 2 channel uses audio 3 for right signal (R2) and audio 4 for left signal (L2).
In 2-in, 2x8-out mode, it is worth noting that headphone monitor 1 has audio 1 on both
channels, and headphone monitor 2 has audio 3 on both channels.
Audio out - 44 pin high density D-Type connector (cable has plug on it)
Pin Signal Desc Pin Signal Desc Pin Signal Desc
1 GND 16 OP1B- Audio 1 31 OP1A+ Audio 1
2 OP1A- Audio 1 17 OP1B+ Audio 1 32 OP1C+ Audio 1
3 OP1D- Audio 1 18 OP1C- Audio 1 33 OP1D+ Audio 1
4 GND 19 GND 34 GND
5 OP2B- Audio 2 20 OP2A- Audio 2 35 OP2A+ Audio 2
6 OP2C- Audio 2 21 OP2D- Audio 2 36 OP2B+ Audio 2
7 GND 22 OP2C+ Audio 2 37 OP2D+ Audio 2
8 OP3A- Audio 3 23 GND 38 GND
9 OP3D- Audio 3 24 OP3C- Audio 3 39 OP3A+ Audio 3
10 OP3B- Audio 3 25 OP3C+ Audio 3 40 OP3B+ Audio 3
11 GND 26 OP3D+ Audio 3 41 GND
12 OP4C- Audio 4 27 GND 42 OP4A+ Audio 4
13 OP4D- Audio 4 28 OP4A- Audio 4 43 OP4C+ Audio 4
14 OP4B- Audio 4 29 OP4B+ Audio 4 44 OP4D+ Audio 4
15 GND 30 GND
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Arrangement of audio outputs and GND pins on 44 way D-Type Connector
RM37 rear module connections
RM37fits in all frames Description
RM37
•24 modules per 4U frame, 12
per 2U frame, 6 per 1U frame
& 2 per desk top box
•All frame slots can be used
Audio in
Pin number Function Comments
a1 IP-L1+
}
Stereo 1 Left input (Audio 1)
a2 IP-L1-
a3 Input_LO Screen for input 1
a4 IP-R1+ }Stereo 1 Right input (Audio 2 )
a5 IP-R1-
a6 Input_LO Screen for input 2
a7 NC No connection
a8 GND
c1 IP-L2+ }Stereo 2 Left input (Audio 3 )
c2 IP-L2-
c3 Input_LO Screen for input 3
c4 IP-R2- }Stereo 2 Right input (Audio 4)
c5 IP-R2+
c6 Input_LO Screen for input 4
c7 NC No connection
c8 GND
Note:
Stereo 1 channel uses Audio 1 for left signal (L1) and Audio 2 for right signal (R1).
Stereo 2 channel uses Audio 3 for left signal (L2) and Audio 4 for right signal (R2).
In 2-in, 2x8-out mode, it is worth noting that headphone monitor 1 has audio 1 on both
channels, and headphone monitor 2 has audio 3 on both channels.
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Audio out
Pin Signal Description Pin Signal Description
a9 OP1A+
Audio 1 c9 OP1B- Audio 1
a10 OP1A- c10 OP1B+
a11 GND c11 GND
a12 OP1C-
Audio 1 c12 OP1D- Audio 1
a13 OP1C+ c13 OP1D+
a14 GND c14 GND
a15 OP2A-
Audio 2 c15 OP2B- Audio 2
a16 OP2A+ c16 OP2B+
a17 GND c17 GND
a18 OP2C+
Audio 2 c18 OP2D- Audio 2
a19 OP2C- c19 OP2D+
a20 GND c20 GND
a21 OP3A+
Audio 3 c21 OP3B+ Audio 3
a22 OP3A- c22 OP3B-
a23 GND c23 GND
a24 OP3C-
Audio 3 c24 OP3D- Audio 3
a25 OP3C+ c25 OP3D+
a26 GND c26 GND
a27 OP4A+
Audio 4 c27 OP4B+ Audio 4
a28 OP4A- c28 OP4B-
a29 GND c29 GND
a30 OP4C-
Audio 4 c30 OP4D- Audio 4
a31 OP4C+ c31 OP4D+
a32 NC c32 NC
Note:
Pin numbers refer to the plug numbering scheme.
2.2 Using unbalanced audio
As the AADA416FR outputs are floating, it is possible to obtain up to 16 unbalanced
audio outputs by wiring the RM17 or RM37 in the correct manner.
An unbalanced output may be obtained by using either the +ve or –ve phase of the audio
signal pair. To produce the required unbalanced output the unused phase of the signal pair
must then be connected to the signal ground.
Note:
It is recommended to set the input gain to -6dB (using PL12-15) to avoid output clipping
when using unbalanced output connections. This is because connecting 1 phase to ground
increases the level on the other phase by +6dB.
To avoid damage to driver outputs, do not connect both phases to ground.
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2.3 General purpose interface
GPI outputs ‘a’ to ‘d’ use switch-closure to indicate AADA416FR status. When closed-
circuit, the GPI line is connected to frame ground.
As supplied, each GPI output has a 330Ohm resistor in series with its output. This allows
for an external LED connected to a DC supply voltage of +5V. GPI inputs ‘e’ and ‘f’ have
a pull up 10k Ohm resistor to +5V.
GPI lines 'e' and 'f' control the overvoltage and silence warning GPI outputs.
GPI status:
GPI Closed-circuit (Ground) Open-circuit
‘a’
Audio 1 silence/overvoltage warning Audio 1 silence/overvoltage is OK
‘b’
Audio 2 silence/overvoltage warning Audio 2 silence/overvoltage is OK
‘c’
Audio 3 silence/overvoltage warning Audio 3 silence/overvoltage is OK
‘d’
Audio 4 silence/overvoltage warning Audio 4 silence/overvoltage is OK
‘e’ (input)
GPI ‘a’ to ‘d’ overvoltage indication is
inhibited
GPI ‘a’ to ‘d’ indicates overvoltage warning
and silence warning (depends on ‘f’ input)
‘f’ (input) GPI ‘a’ to ‘d’ silence indication is inhibited GPI ‘a’ to ‘d’ indicates silence warning and
overvoltage warning (depends on ‘e’ input)
4U frame GPI Connections
GPI lines ‘a’ to ‘f’ of each card connect to 1 of 8 rear remote connectors as follows:
Slot no. ‘a’ pin ‘b’ pin ‘c’ pin ‘d’ pin ‘e’ pin ‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
8 (3)
9 (3)
18 (3)
26 (3)
19 (4)
20 (4)
4
7 (3)
16 (3)
17 (3)
25 (3)
10 (4)
11 (4)
5
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
6
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
7
5 (3)
6 (3)
15 (3)
24 (3)
1 (4)
2 (4)
8
4 (3)
14 (3)
13 (3)
23 (3)
3 (4)
4 (4)
9
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
10
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
11
3 (3)
12 (3)
22 (3)
21 (3)
12 (4)
13 (4)
12
10 (3)
11 (3)
19 (3)
20 (3)
21 (4)
22 (4)
Upper
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Slot no. ‘a’ pin ‘b’ pin ‘c’ pin ‘d’ pin ‘e’ pin ‘f’ pin
1
8 (5)
9 (5)
18 (5)
26 (5)
19 (6)
20 (6)
2
7 (5)
16 (5)
17 (5)
25 (5)
10 (6)
11 (6)
3
8 (7)
9 (7)
18 (7)
26 (7)
19 (8)
20 (8)
4
7 (7)
16 (7)
17 (7)
25 (7)
10 (8)
11 (8)
5
5 (5)
6 (5)
15 (5)
24 (5)
1 (6)
2 (6)
6
4 (5)
14 (5)
13 (5)
23 (5)
3 (6)
4 (6)
7
5 (7)
6 (7)
15 (7)
24 (7)
1 (8)
2 (8)
8
4 (7)
14 (7)
13 (7)
23 (7)
3 (8)
4 (8)
9
3 (5)
12 (5)
22 (5)
21 (5)
12 (6)
13 (6)
10
10 (5)
11 (5)
19 (5)
20 (5)
21 (6)
22 (6)
11
3 (7)
12 (7)
22 (7)
21 (7)
12 (8)
13 (8)
12
10 (7)
11 (7)
19 (7)
20 (7)
21 (8)
22 (8)
Note:
Remote 1, remote 3, remote 5 and remote 7 are 26-way high density D-Type female
sockets and frame ground is pin 2 and +5V @500mA is pin 1 in each case.
Remote 2 and remote 4 are 26-way high density D-Type male plugs and frame ground is
pin 6 and +5V @500mA is pin 15 in each case.
Lower
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2U frame GPI Connections
GPI lines ‘a’ to ‘f’ of each card connect to one of four rear remote connectors as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
8 (3)
9 (3)
18 (3)
26 (3)
19 (4)
20 (4)
4
7 (3)
16 (3)
17 (3)
25 (3)
10 (4)
11 (4)
5
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
6
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
7
5 (3)
6 (3)
15 (3)
24 (3)
1 (4)
2 (4)
8
4 (3)
14 (3)
13 (3)
23 (3)
3 (4)
4 (4)
9
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
10
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
11
3 (3)
12 (3)
22 (3)
21 (3)
12 (4)
13 (4)
12
10 (3)
11 (3)
19 (3)
20 (3)
21 (4)
22 (4)
Table shows pin number (remote number)
Note:
Remote 1 and remote 3 are 26-way high density D-Type female sockets and frame
ground is pin 2 and +5V @500mA is pin 1 in each case.
Remote 2 and remote 4 are 26-way high density D-Type male plugs and frame ground is
pin 6 and +5V @500mA is pin 15 in each case.
1U frame GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to 1 of 2 rear remote connectors as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
4
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
5
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
6
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
Table shows pin number (remote number)
Note:
Remote 1: 26-way high density D-Type socket. Frame ground is pin 2 and +5V @500mA is
pin 1.
Remote 2: 26-way high density D-Type plug. Frame ground is pin 6 and +5V @500mA
is pin 15.
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DTB-AV desk top box GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to the rear remote connector as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
1
2
3
4
5
6
2
9
10
11
12
13
14
Note:
Remote connector is 15-way normal density D-Type socket. Frame ground is pin 15.
Indigo DT desk top box GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to the rear remote connector as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
Note:
Remote 1: 26-way high density D-Type socket. Frame ground is pin 2 and +5V @500mA is
pin 1.
Remote 2: 26-way high density D-Type plug. Frame ground is pin 6 and +5V @500mA
is pin 15.
The modules can be plugged in and removed while the frame is powered without damage.
The AADA416FR is used with the RM17 and RM37 single slot rear connectors which
allow up to 12 such modules, in any mix in a 2U frame.
Other Crystal Vision rear modules and interface cards can be mixed in any quantity with
AADA416FR cards, up to a maximum of 12 cards, providing the other cards do not
exceed the power rating of the PSU chosen (normally 150W).
2.4 Configuration
The AADA416FR is equipped with on-board PCB header blocks, PL3 and PL2 to
configure the amplifier for different maximum operating levels. This enables the module
to be matched to both +18dBu and *+24/+28dBu.
There are also 3 jumper links, JL1, JL2 and JL3 provided to link audio channels together
to provide a variety of input / output configurations.
Other settings on the card should normally be left in the factory default positions.
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AADA416FR showing configuration jumpers and PCB header blocks
Note:
The maximum input signal level is +28dBu and the maximum possible output level is
+25dBu.
Monitoring output
Two 3.5mm jacks labelled MON 1 and MON 2 are provided to monitor the output of the
distribution amplifier after any gain or channel combining settings.
The signal is scaled down so that the headphone sockets produce +10dBU for 0dBFS at
the distribution amplifier output.
For MON 1 the tip of the 3.5mm jack is audio 2 and the ring is audio 1 and for MON 2
the tip of the 3.5mm jack is audio 4 and the ring is audio 3.
Linking audio channels together
Links JL1, JL2 and JL3 on the AADA416FR board allow audio channels 1 to 4 to be
configured in any of the following modes.
a. 4 channels- each channel is 1-in, 4-out
b. 3 channels- channels 1 and 2 are 1-in, 4-out; channel 3 is 1-in, 8-out
c. 3 channels - channels 1 and 3 are 1-in, 8-out
d. 2 channels - channel 1 is 1-in, 4-out; channel 2 is 1-in, 12-out
e. 1 channel- channel 1 in 16 channels out
The link settings required for each mode are as follows:
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AADA416FR showing channel combining links
Modes JL1 JL2 JL3 Comments
a Unlink Unlink Unlink 4 separate audio channels
b Unlink Unlink Link Audio 4 outputs same as audio 3 outputs and uses audio 3 input
Audio 4 gain pot is out of circuit
LED 4 conveys the same information as LED 3
Only audio 1, 2 and 3 inputs are used
c Link Unlink Link Audio 2 outputs same as audio 1 outputs and uses audio 1 input
Audio 2 gain pot is out of circuit
LED 2 conveys the same information as LED 1
Audio 4 outputs same as audio 3 outputs and uses audio 3 input
Audio 4 gain pot is out of circuit
LED 4 conveys the same information as LED 3
Only audio 1 and 3 inputs are used
d Unlink Link Link Audio 3 and 4 outputs same as audio 2 outputs and uses audio 2 input
Audio 3 and 4 gain pots are out of circuit
LED 3 and 4 convey the same information as LED 2
Only audio 1 and 2 inputs are used
e Link Link Link Only audio 1 input is used
Audio 2, 3 and 4 outputs same as audio 1outputs
Audio 2, 3 and 4 gain pots are out of circuit
LED 2, 3 and 4 convey the same information as LED 1
Note:
Link corresponds to jumper in 1-2 position (towards TOP )
Unlink corresponds to jumper in 2-3 position (towards BOTTOM)
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Changing the maximum operating level
The maximum operating level is changed by moving the position of two 18-way (2 x 9)
PCB header blocks, PL3 and PL2.
To change the maximum operating level from the default of +24/+28 dBu to +18dBu
proceed as follows:
•Move both PL3 and PL4 from the lower position to the upper position to increase the input gain
of all 4 channels by 6dB and decrease the output gain of all 4 channels by 6dB
Note:
In the upper position, the lowest two pins of the 20 way plugs on the main module should go
through the lower holes in the PCB header block.
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To change the maximum operating level from +18dBu to +24/+28 dBu proceed as
follows:
•Move both PL3 and PL4 from the upper position to the lower position to decrease the input gain
of all 4 channels by 6dB and increase the output gain of all 4 channels by 6dB
Note:
In the lower (default) position, the top two pins of the 20-way plugs on the main module
should go through the upper holes in the PCB header block.
The factory default position for PL3 and PL2 is for both to be in the bottom position; this
will allow audio signal levels of up to +28dBu at the inputs and +25dBu outputs.
Warning:
Take care that no pins appear outside the area of the PCB header blocks.
PL3/2– Input/output signal level select, audio channels 1 to 4
Max DFS level Input gain PL3 Output gain PL2 Var gain range
+18 dBu in and out Towards top Towards top -12dB to +12dB
+24/25 dBu in and out Towards bottom Towards bottom -12dB to +12dB
+24/28 dBu in +18 dBu out Towards top Towards bottom -6dB to +18dB *
+18dBu in +24/25dBu out Towards bottom Towards top -18dB to +6dB *
DFS = Digital Full Scale
Notes:
*For the easy set unity gain facility to function properly, jumpers PL3 and PL4 must both
be in the top or bottom position, otherwise the set-gain utility gain will produce an error
of -/+6 dB.
Statesman and the active panel LCD display will take into account the position of PL3
and PL2 when showing the available gain range.
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3 Card edge operation
Once the start-up initialisation procedure is complete, the AADA416FR card can be
controlled or configured from the card edge, the active control panel or the Statesman PC
Control System. This chapter will concentrate on the card edge controls.
The front edge of the card provides power rail monitoring, channel gain adjustment,
silence threshold, silence time, overvoltage level, analogue audio monitoring outputs,
remote/local selection and an easy unity gain setup facility.
AADA416FR front edge view
The 4-way piano switch allows the operating mode and unity gain setup facility to be
selected.
Lever Function Action
All up Local mode Card edge control enabled
1 down Remote mode Active control panel enabled
2 down N/A No function assigned
3 down N/A No function assigned
4 down Unity gain Easy unity gain setup facility
4-way piano switch menu functions
LED INDICATION
LED Function Action
Yellow (top left) Warning Audio 1 channel
Overvoltage(LED flash)/Silence(LED on)
Yellow (bottom left) Warning Audio 2 channel
Overvoltage(LED flash)/Silence(LED on)
Yellow (top right) Warning Audio 3 channel
Overvoltage(LED flash)/Silence(LED on)
Yellow (bottom left) Warning Audio 4 channel
Overvoltage(LED flash)/Silence(LED on)
Green (top) PSU + 5V power supply OK
Green (bottom) PSU +/- 18Vpower supply OK
LED indicators
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Audio gain
Gain is variable over 24.0dB in 0.5dB steps for each channel using the front 4 preset
multiturn potentiometers labelled ‘Audio Gain’. The AADA416FR is supplied with a
factory-set gain of 0dB.
Easy unity gain setup
The AADA416FR allows a special mode for adjusting the four controls, for gain of 0dB,
without the use of external audio signals and level meters.
•The card edge unity gain setup procedure is as follows:-
•While in local mode switch lever 4 of the 4-way piano switch to the DOWN
position
•The yellow LEDs will now indicate the gain setting for each channel
•Adjust each of the 4 audio gain potentiometers in turn so that the corresponding
front LEDs 1 to 4 light up - ensure that the adjustment is in the centre of the
range over which the LEDs light up
•The gains are now at 0dB
•Return pole 4 of the 4-way piano switch to the up position
The state of the 4 LEDs will now determined by the level of the audio signal at the output
of the AADA416FR.
Note:
The jumpers PL2 and PL3 must both be in the top position or bottom position, otherwise
the gain will actually have -/+6 dB added to it.
The factory default setting also lights the 4 yellow LEDs.
Overvoltage detection level
Overvoltage detection level, labelled 0V is adjustable from the front of the board. Turning
the potentiometer fully clockwise will set the overvoltage limit to +25dBu. The
potentiometer range is from 6dBu to 25dBu.
Any peak audio signals, which exceed the overvoltage limit, will illuminate the
corresponding LED by flashing it 4 to 5 times a second. This flashing will continue for
0.8 seconds after the peak audio signal has dropped below the overvoltage limit.
Silence detection level
Silence detection level labelled Sil is adjustable from the front of the board. It is factory
set to an output level of –30dBu. Audio signals above this level (and below the
overvoltage level) will produce no illumination of the corresponding LED.
The potentiometer range is from -18dBu to -42dBu.
AADA416FR User Manual R1.918 22 May 2018

Crystal Vision Card edge operation
Silence time
A 16-position switch at the front of the board labelled Sil Time determines the time
duration to detect that an audio signal is continuously below the silence detection level
limit. Each of the 4 channels is timed individually.
Position 0 is a time of 1 to 2 seconds, position 1 is approximately 8 seconds, and for
position steps of 2 to 9 and A to F add on another 8 seconds for each step giving a
maximum time of 120 seconds for position F. If these times are exceeded the LED for
that channel will illuminate and stay illuminated until the audio signal level is greater than
the silence level. If this occurs the LED will turn off.
Note:
In remote mode, many of the above adjustments can be set to different values to that set
in local mode. These values are retained through power down, and restored when the unit
is powered up.
AADA416FR User Manual R1.919 22 May 2018