Transcript
Operation Instruction Manual
iX LS prioritised mixer
Features
Technical Description
The iX LS is a six channel, top down prioritised mixer.
Input signals at line level (0 dBm) are processed by a balanced input buffer pre-amp and applied to the input of a solid state ANALOGUE SWITCH. At this point the audio input channel is monitored for audio signal and the appropriate front panel ‘Signal Present’ LED is illuminated if signals are detected.
The iX LS provides fault monitoring* of all six inputs and adds a 22.05 kHz tone to it’s output to monitor the link to the amplifier(s) and from the amplifier(s) to the load. Paging and routing control is programmed on installation to suit the application by selecting the appropriate jumpers inside the unit. Input 6 can be a music input (selected when no priority is active) or by moving an internal jumper can be selected as another paging input. Full surveillance from the microphone capsule onwards is achieved when used with SigNET microphones and pre-amp boards (e.g. FM1 fire microphone or 1ZDM desk microphone), incorporating pre-amps to line level (775 mV RMS) with microphone capsule monitoring and 15V phantom voltage monitoring to ensure the microphone line is intact full surveillance from the microphone capsule onwards is achieved. Mic level inputs are not supported. Line level inputs in the range 130mV to 1 volt can be used (eg music sources such as CD players).
The ANALOGUE switch is under control of a sequential LOGIC PRIORITY circuit, conferring highest priority to input 1 and lowest priority to input 6. The priority circuit is informed of active input channels by means of a PTT input for each channel, a 470 ohm path to ground (see page four) indicating that the remote PTT button or equipment is requesting access to the input channel. If there is no higher priority input active, the LOGIC PRIORITY circuit will activate the appropriate ANALOGUE SWITCH and permit the audio signals to be passed via an input level control and summing mixer to the master OUTPUT LEVEL control. The signal level at this point is shown on an LED OUTPUT LEVEL display. After three band equalisation (100Hz, 1KHz, 10 kHz) the signal is passed to the LINE OUTPUT stages which provide the drive for a balanced audio output.
* Note The term monitoring refers to checking the the signal path is intact and not listening to the signal itself.
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Front panel features
1 2 3 4 5 6
Name Mains on Battery on Fault Output VU Master control EQ controls
7
Input controls
Function / Description Green LED, lit when unit powered by mains Green LED, lit when unit powered by battery backup Yellow LED lit when fault is detected See operation section Master Audio level control. Turn counterclockwise for minimum Tone control of bass, mid and treble response. The flat position obtained when set to 12 o’clock. Turn clockwise to raise the tone level by approx.+10 dB. Turn counterclockwise to lower the tone level by approx.-10 dB. Audio level control for each input. Turn counterclockwise for minimum.
Each input also has three associated LEDs as opposite: When audio is active the signal LED will flash in sync with audio peaks to indicate that the audio path to the input stage is intact. This occurs even when PTT is not selected.
Block diagram iX LS 6 INPUT PRIORITISED MIXER -18 -9 -6 -3 0
TOP PRIORITY INPUT
ANALOGUE SWITCH
BLOCK DIAGRAM ISSUE 2
AUDIO 1 IN OUTPUT LEVEL SIGNAL 1
LEVEL 1
44.1 KHz 50 PPM CRYSTAL
PTT
LOGIC PRIORITY 1
MONITOR
•
INPUTS 2 TO 5 IN DESCENDING PRIORITY
FAULT 1
EQ
ACCESS 1
LINE OUTPUT ANALOGUE SWITCH
AUDIO 2 TO 5 IN
LEVEL 2 TO 5
SIGNAL 2 TO 5
OUTPUT BASS LEVEL
MID TREBLE
BUSY PTT
LOGIC PRIORITY 2 TO 5
MONITOR
PSU
~
+15V
6K8
470R
ACCESS FAULT 2 TO 5 ANALOGUE SWITCH
AUDIO 6 IN
PTT OUT
SIGNAL
LEVEL 6
BUSY PTT
PAGE OUT
+7V5
+24V
230VAC FAULT 2 TO 5
INPUT 6. MUSIC OR PAGING
22.05 KHz TONE
BUSY
GENERAL FAULT
LOGIC PRIORITY 6
MONITOR
CONFIDENCE:100 mA OPEN COLLECTOR FAULT 6
ACCESS 6
PAGE / MUSIC
BUSY CASCADE INPUT
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Rear panel features
1 2 3
Name Mains in Mains switch control
Function/Description 6 Amp IEC 22 type inlet Rocker switch for on-off
Pin terminology
Page out activation of any PTT connects 470W to ground to indicate priority and select an input on next equipment. Busy in When connected to ground makes all busy outs active and prevents paging from iX LS.
4
Battery input
5
Audio output
6
Confidence out Normally shorted to ground. On fault goes open circuit.
PTT in request for access by shorting 470W to ground. Connect a 6K8W to ground if not used or fault will show.
Inputs (1-6)
Busy out system in use by another input. Connected to ground when active. +24VDC protected by internal fuse.
7
Fuse
1A (T) 20mm glass type
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Instalation
AC power operation
Unpacking Upon receipt of the amplifier shipment, please inspect for any damage incurred in transit. If damage is found, please notify your local representative and the transport company immediately. State date, nature of damage and whether any damage was noticed on the shipping container prior to unpacking. Please give the waybill number of the shipping order.
For normal AC operation, plug the AC power supply cord in a wall outlet of 230 V specified voltage. The unit complies with BS415. AC power cord The wires in the mains lead supplied with the unit are coloured in accordance with the following code. Green and Yellow Blue Brown
Earth Neutral Live
The unit should not be placed in areas; 1. with poor ventilation 2. exposed to direct sunlight 3. with high ambient temperature or adjacent to heat generating equipment 4. with high humidity or dust levels 5. susceptible to vibration
As the colours of the wires in the mains lead of this unit may not correspond with the coloured markings identifying the terminals in your plug, please connect as follows.
This has been designed to be installed in a variety of ways, as follows:
Wire
Plug terminal
Green & Yellow ‘E’ mark ‘EARTH’ symbol mark ‘GREEN’ mark ‘GREEN AND YELLOW’ mark
Rack mounting Remove the four countersunk screws from the sides of the case at the front, and attach the wing to the side of the case with the four round-head screws from the bottom edge of the case sides. The countersunk screws can then be placed in the threaded holes on the bottom edge of each side for storage. Wall mounting Fix the mounting wings to the threaded holes on the bottom edge of each side of the case with the round headed screws supplied in the holes. DO NOT use any other length of screw than that provided to mount the wing to the case side, as this may damage the transformers and cause the unit to fail.
Blue
‘N’ mark ‘BLACK’ mark ‘BLUE’ mark
Brown
‘L’ mark ‘RED’ mark ‘BROWN’ mark
Caution To prevent electric shock do not remove the cover
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Operation
Fault monitoring
All Controls are recessed to prevent tampering. Use a 4mm flat bade screwdriver to adjust. The control is recessed 11mm inside the case. Do not use excessive force or the control will be damaged.
iX LS fault monitoring complies with the fire alarm standard BS5839:Part 4.
Volume control setting For the average input signals, the master volume control should be set to three quarters on (about 1 o’clock). In relation to the level of inputs it is recommended that the gains or losses should be equally divided between individual controls and the master control. Tone control setting The separate tone controls provide boost and attenuation of bass, mid and treble response. The flat position is obtained when the knobs are set to 12 o’clock. Turn the bass control knob, mid control knob and treble control knob respectively, clockwise to raise the tone level by approximately +10 dB. Turn counterclockwise to lower the tone level by approximately -10 dB. When microphone paging is provided to a reverberant room, clear, crisp sound reproduction is possible by attenuation of the bass.
The iX LS monitors its inputs for faults signalled by the SigNET LS peripheral products to which they are connected (e.g. 1ZDM or MP2). Each peripheral provides a 6k8 resistance to ground from the PTT line provided the following conditions apply; Phantom Power supplied by the iX LS is detected by the peripheral unit, No faults are detected from the peripheral unit microphone capsule, 24 VDC supply (from the iX LS Control connector) is present. Monitoring of the PTT line is based on a resistive potential divider principle as shown below; 27V6DC 1K
PTT Input
Output level meter The LED meter indicates the output level. When voice or music is amplified in practice, set the volume control at the position where the maximum output level is below zero. While the yellow LED indicator remains lit, the output is distorted, In this case, lower the sound volume by means of the relevant input control.
Diagram of output meter
o -18
o -9
o -6
o -3
o 0
o -18
o -9
o -6
n -3
n 0
o -18
o -9
o -6
o -3
n 0
PTT Switch
6K8
470R
The terminal voltage here defines the status of the PTT line:Open circuit fault OK Trigger Short circuit fault 0V
A 22.05kHz surveillance tone is injected into the two output audio paths for monitoring by subsequent SigNET LS equipment (e.g. the P2.200LS amplifiers).
Maximum normal range
Distorted output
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Input connections
Input connections
Background music (Input6 Only) This input has the option to be set as a Background music channel (This is the default setting but can be deactivated, see Internal adjustments section). In the default mode when none of the other inputs are active input 6 becomes active to provide a background music source ( page out is not activated when in this mode).
Connecting a SigNET 1ZDM to the iX LS Diagram shows surface mount box connector supplied with 1ZDM. Note screen is connected at only at the iXLS end.
Connecting a CD player to the iX LS
Connecting a SigNET FM1 to the iX LS Diagram shows the terminal block of the FM1, connect colour for colour. Note screen is connected at only at the iXLS end.
Connecting a SigNET MP2 (Media player) to the iX LS Triggers of the MP2 are wired to whatever external equipment will be used to trigger them (e.g. switched relay or fire interface).
Unused Inputs Any inputs which are not being used require a 6K8W resistor across the input connector, if this is omitted the iX LS will generate a fault on this input.
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Cascading the iX LS
Output connections
iX LS’s can be connected together to provide additional inputs into a system. The first iX LS is designated as a master, the second as a slave. The priorities of the slave are top down below the master (ie one to five on master plus a link to the slave, the slave then has priorities six to eleven). The slave is connected via input6 of the master. EQ controls of slave must be set to the mid position. Cascaded iX LS’s can be set up in two styles:
Connecting a SigNET P2.200LS (Power amplifier) to the iX LS (including battery backup)
Ten inputs and one music channel (default setting). If a background music channel is required, this will be on input 6 of the slave, both iX LS’s must have the Music / page Jumper on input6 set to Music Eleven inputs If eleven inputs are required, both iX LS’s must have the Music / page Jumper on input 6 set to page (see Internal adjustments).
Connecting node 1 of a SigNET SS2n to an iX LS
Connecting node 2 of a SigNET SS2n to an iX LS
Note screen is connected at only at the first iX LS.
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Internal adjustments
Internal adjustments
These adjustments should only be carried out by qualified personnel. The power lead must be disconnected before the top cover is removed. The following adjustments involve removal of the top cover of the unit, remove the side screws and then lift lid off.
Monitor tone pre-set and VMON on/off jumper In the default setting the iX LS will generate the monitor tone used for fault monitoring. In a system which already has monitor tone generation (e.g. systems with SigNET SS2n network stations), this must be switched off. IX generates Monitor tone
VMON jumper
Monitor tone pre-set
Yes (Default)
Off
Set to 35mV *
No (e.g. SS2n’s in system)
On
Off (fully anticlockwise)
Attach a scope probe across the audio output then adjust the pre-set till the tone level is equal to 35mV. (This will never need to be done unless, the unit has been previously set up to work with SS2ns.) All other jumpers on the unit are all for SigNETs internal use / test purposes only. Music / page Jumper on input 6 M u s i c (Default)
When none of the other inputs are active input 6 becomes active to provide a background music source.
Page
Input acts the same manner as inputs 1-5.
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Input cabling Fault Finding
Output cabling Fault Finding
This section is a simple fault finding procedure for testing a non working input. With the inputs cabling in place and connected to the iX LS, use a multimeter between the ground pin and the following pins of the input connector: Pin
Expected Result
24+
22 ® 29V DC
PTT
13.0 ® 14.1V DC
= OK
8 ® 10V DC
= Page
<7V DC
= short circuit fault LED lit
>14.1V DC
= Open circuit fault LED lit
Audio+
14.4 ® 15.1V DC
Audio-
14.4 ® 15.1V DC >13V DC
= Not busy
<1V DC
= Busy
Busy
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Specification All inputs
line level (775mV) electronically balanced
Input level control
minus infinity to +6dB
Input impedance
10kOhm
Output level
775mV 0dBV 600 ohms balanced electronically
Bandwidth at any output level
30 Hz to 30 kHz -1dB
Equalisation
12 dB/Octave shelving filters at 100Hz, 1kHz and 10kHz
Equalisation bands
3 Band @ 100Hz, 1KHz, 10KHz
Distortion
<0.05% THD @ 1 kHz
Dynamic range
>90dB
Noise
<-86dB
CMRR
>84dB
S/N ratio
better than 70dB
Power consumption
18mA @ 230VAC 150mA @ 24VDC Plus the loading of up to six inputs (consoles, etc.) @ 100mA max each @24VDC.
Fuse Input
6x 250mA (F) 20mm glass type
Fuse battery
1x 500mA (F) 20mm glass type
Fuse mains
1x 1A (T)
Width
433mm
Height
44mm
Depth
136mm (behind front panel)
Weight
2kg
20mm glass type
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Blank panel
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SigNET Amplification & Control Tower Road, Glover Estate, Washington, Tyne & Wear, NE37 2SH Tel: +44 (0) 191 417 4551 Fax: +44 (0) 191 417 0634 Page 12 Doc No. DCP0001311 DH 14/11/05 rev4
