MANUAL - Funk Tonstudiotechnik
Contents
1. ER plug should be adjusted by wiring a 232 resistor in parallel between pins 2 and 3 This x sets the input to a characteristic impedance of 75 Q which is common for SPDIF signals The hot wire of the incoming line is connected to pin 2 while the shielding is connected to pins 3 and 1 of the XLR plug Pin 1 on the XLR plug is left open if the sending device and the PAS 8 need to be galvanically separated The shielding is only connected to pin 3 in this case 232 Ohm The figure shows the solder side of the XLR plug Pre assembled adapter cables for this purpose are available under the name CASA The CASA T cable has similar functions but works using an integrated fast pulse transformer which allows it to be used with non standard balanced inputs without an input transformer INPUT AND OUTPUT AMPLIFIERS The PAS 8 is designed not only as a recording signal switch but primarily as a high quality monitor matrix for use with an external D A converter In order to guarantee the required high signal quality all the outputs of these routers are equipped with automatic duty cycle post correction positive and negative pulse widths are balanced This keeps the bit width duty cycle more or less constant even for highly different input levels and varying rise and fall times of the signal at the input The same applies to the PAS 8 s insert channel H 1 ps 0 50 1 ps 100m 1454 sweeps average low high sigma duty mn2. for field service or a repair and service workshop Persons handling such components must be connected to the EPA s ground potential The device to be serviced or repaired as well as any tools aids and EPA compliant semi conducting table mats or floor mats must also be connected to metallic surfaces in order to prevent ESD To prevent any exposure of the components to transients and damage by excessive voltage or equalisation currents always turn off the device and dissipate any capacitor charges before making or breaking electrical connections 17 CE DECLARATION OF CONFORMITY FUNK TONSTUDIOTECHNIK 10997 BERLIN hereby declares and warrants that the product PAS 8 is compliant with the following standards according to EU Directives and their amendments Safety Protection acc to EN60950 1992 A1 A2 1993 UL1950 EMC EN55103 1 EN55103 2 Evaluation criterion B electromagnetic environment E4 Berlin 12 Jan 2011 Th Funk owner 19
3. to the PAS 8 first then to the second recipient The router is delivered with a 110 Ohm input terminator For more information on configuring the PAS 8 s input resistors please see the INPUT IMPEDANCE section BACKUP In the event of a power failure or when the device is turned off the current input selection is automatically backed up in non volatile memory As soon as the power supply is back online the router automatically restores the stored configuration This also allows the PAS 8 to be operated with a time switch INPUT SIGNAL MONITORING The digital router indicates the presence of a clock for the currently selected input at the front panel which facilitates quick signal tracking when required There are separate indicators for the monitor and recording channel PAS 8 combined with AMS 2 or MTX MONITOR If the PAS 8 is used in combination with an AMS 2 or MTX MONITOR analogue monitor system the PAS 8 should be supplied with power via these monitor systems In this configuration the PAS 8 power switch should left off in order to ensure a central reset by the monitor system P e a Ea OG The PAS 8 has an internal switching feature to adapt the start up time il ale rh a J JE to the different requirements of AMS 2 and MTX MONITOR Start up k ie time is controlled by Jumper 16 in the centre of the main board This a ee jumper is normally closed for standalone operation or operation with SEE
4. vibration or mechanical shocks CONDENSATION When the device is brought from a cold into a warm environment water may condense in the interior and there is a risk of malfunction Do not turn on the device for thirty minutes after such a temperature change in order to allow the PAS 8 to assume the temperature of the environment CLEANING Use a soft cloth slightly moistened with a mild soap solution for cleaning the casing the front panel and the controls Do not use abrasive pads or powders or alcohol or petroleum based solvents to clean the device as this may damage the casing surface and the controls WARRANTY This device has a three year warranty Any manufacturing or material defects will be repaired free of charge during this period Unauthorised opening will void the warranty I IS 8 DIGITAL MONITOR ROUTER The PAS 8 DIGITAL AUDIO SIGNAL SWITCH is a professional monitor router for AES EBU signals It is used to play back record and monitor digital signals in recording and video studios The PAS 8 is ideal for connecting digital audio devices to AES EBU interfaces and various peripheral devices All inputs and outputs have XLR jacks with gold plated contacts The PAS 8 is not a format converter However it accepts the commonly used SPDIF signal levels The signal output is at the usual AES EBU level of 4 Vss peak to peak The device is controlled using buttons on the front panel However it can also be remote
5. ATDAIALNG JLAW OLNY 3 TJADALNA JLNU OLNY I TJADALNG WJAY9VIO 2143018 19LI9I0 XIUGLYW LAGDNI 312313 GOL YN 8 SVd NEI S3Y La SNI SdNI ZdNI NEI SIY GdNI 13 li bFdNI EdNI g NEI S3Y ZdNI 183 ZS3U TANI JITTER ANALYSES Small time offsets jitter of individual flanks are the main cause of quality degradation in digital audio signal transmission High quality transmission therefore requires a reduction of the jitter to a minimum The router s active circuitry ensures low jitter which makes the device highly suitable for use before a D A converter in the signal chain The additional DUTY CYCLE correction ensures a DC free output signal irrespective of signal levels and duty cycle mean time ratio of positive and negative bits of the selected source in addition to reducing potential jitter caused by the low pass effect of a connected cable The figures below show jitter measurements for the PAS 8 and the AMS 2 DAR and illustrate the extremely low jitter in the signal processing Jitter RMS via FFT 179 587 ps 885 31 ps 47 999 kz STORE INSTRUMENT STATE Filename JITSP_DD SA Jitter RMS via FFT 233 697 ps 1 08623 ns 47 999 kiz STATUS GENERATOR PANEL Meas Mode JITTER PHAS Input BAL XLR Jitter Ref GEN CLK FUNCTI
6. MANUAL DIGITAL AUDIO ROUTER IP FUNK TONSTUDIOTECHNIK PLEASE NOTE INTRODUCTION OPERATION AUDIO FORMAT AND CONFIGURATION INPUT CONFIGURATION AUDIO SIGNAL QUALITY POWER SUPPLY OPTIONAL VERSIONS AND ACCESSORIES CABLING AND SIGNAL DISTRIBUTION PIN ASSIGNMENT BLOCK CIRCUIT DIAGRAM MEASUREMENT GRAPHS FOR JITTER SPECTRUM TECHNICAL SPECIFICATIONS ELECTROMAGNETIC INTERFERENCE MAINTENANCE AND REPAIR CE DECLARATION OF CONFORMITY page page page page page page page page page page page page page page page page 11 10 10 12 10 13 14 15 16 17 18 This user manual only applies to the PAS 8 digital router with 8 digital inputs CAUTION Always connect this device to a 230 VAC 50 60 Hz 115 VAC 50 60 Hz earthed power supply Never connect the device to any outlet without a protective earth contact Never expose the device to rain or moisture as this creates a hazard of fire and electrical shock Do not connect the device to a power supply if it has been damaged mechanically or if fluids or objects have entered into it Immediately disconnect the power supply in the event of mechanical damage or contact with fluids Only qualified service personnel following all applicable rules and regulations may open the device or perform repairs ENVIRONMENTAL REQUIREMENTS Never place the device near heat sources like radiators or hot air vents Do not expose the device to dust
7. ON FFT DC Suppres ON Unit s FFT Size 8192 Window RIFE UINC 3 Aug Count 3 DISPLAY PANEL Top 5 0000 ns COMMENT PAS 8 MONITY PAS 8 MONITOR OUT Jitterspectrum Jitter RMS via FFT 204 792 ps 0 96211 ns 48 000 kHz GENERATOR PANEL Meas Mode JITTER PHAS Input BAL XLR Jitter Ref GEN CLK FUNCTION FFT DC Suppres Unit FFT Size 8192 Window RIFE VINC 3 Aug Count 3 DISPLAY PANEL YR Rw RR RY W Top 5 0000 ns COMMENT P S 8 INSEY Jitter RMS via FFT 130 280 ps 420 89 ps f 95 998 kiz STATUS Wp J Sample Frq VALUE ANALYZER PANEL J Meas Mode JITTER PHAS J Input BAL XLR J Jitter Ref GEN CLK J DC Suppres ON J FFT Size 8192 J Window RIFE VINC 3 J Avg Count 3 DISPLAY PANEL J Top 5 0000 ns T Bottom 0 0035 ns J COMMENT JITTERSPEKT FILE PANEL 96 000 kHz J Unbal Vpp 1 0000 U J Bal Vpp 4 0000 V Y Fig 1 The measurement record on the left shows the jitter spectrum of the testing device Rhode amp Schwarz UPL All measurement records are scaled identically The evaluated measurement range is from a few Hz up to 120 kHz Fig 2 Measurement at the PAS 8 monitor output Despite the measuring device s extremely high resolution it shows that there is hardly any increase of jitter across the entire spectrum All readings are very close to the sensiti
8. Ss er MTX MONITOR For use with the AMS 2 jumper 16 has to be open J a F HE ie Jumper 16 2 21212 gene eogal DUTY MON REC INS PAS 8 INPUT CONFIGURATION CHANGING THE INPUT IMPEDANCE The jumpers for input impedance selection can be reached by opening the device cover If the jumper is on both contacts input impedance is 110 Q If the jumper is on only one contact the input impedance is gt 1 kQ The PAS 8 has 8 jumpers for its 8 inputs and an additional jumper for the digital insert input Jumper for Input impedance 1 8 Jumper for insert Q Q neJ O o N Q neJ Q e 2 Q Eg 7 o 7 O Q neJ Q O Q O Q qi z O ne E QO LN E O LN E O N g E L i E I L Fyn e o O o 8 5 8 E 8 m 3 8 8 8 A ac 8 G i i BY 9 mas pui e N en V er ea oe ant md ms 9 L m 3 a ann fr imi fo a G mig oc J la i i E fe W Bs22222 pas 8 2 ETE HH HHH OG AMS2 DAR VZ ma maaan i j ot aE I asnus FUNK TONSTUDIOTECHNIK _ 0 28 2 8 ooon ojololo olo eolojo o DUTY MON REC INS SPDIF SIGNALS TO BALANCED AES EBU INPUTS XLR CONNECTOR If an SPDIF signal is fed in through the XLR inputs the impedance at the connected XLR
9. TOR B MONITOR A At this configuration example it is possible to make a copy from every source to the CD Recorder or to the digtal workstation At the same time it is possible to monitor another source independent from the recording signal and to measure the level of this signal The digital compressor is switchable into the copy signal path or to the monitor signal for testing CIRCUITRY The router s active circuitry ensures low jitter which makes the device suitable for use before a D A converter in the signal chain In order to improve the operation of a subsequent converter the output amplifiers of the PAS 8 come with DUTY CYCLE correction This ensures a DC free output signal irrespective of the signal level and duty cycle mean time ratio of positive and negative bits of the selected source in addition to reducing potential jitter caused by the low pass effect of a connected line SYNCHRONISATION The PAS 8 does not require external synchronisation If the router is operated as a signal switch in a synchronised periphery environment then signal switch over is noise free for two identically modulated signal sources as well as for digital 0 The same is true for switchover between two signals derived from a single source by splitting between two matrix inputs Switching between two differently modulated signals however produces a cracking noise due to the level difference at the moment of switchover This type of switchover noise is in
10. controlled via AMS 2 or MTX MONITOR monitor systems As a special feature the PAS 8 offers a switchable INSERT function This permits a processing unit connected to the rear XLR jacks to be looped into the signal chain This function can be selected for the monitor or the recording channel This for instance allows as shown in the example below a digital compressor to be routed into the monitor channel for adjustment then switched to the recording channel after optimisation Afterwards the monitor channel will be free for monitoring again pA gt DIG RECORDING SIGNAL CONNECTION EXAMPLE E gt DIG MONITOR SIGNAL INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 RECORDING REC B 0000 CD R 0000 AT P gt e INS MON INS REC POWER REC CLK pane ed MON CLK PROFESSIONAL DIGITAL AUDIO ROUTER J SS ee FUNK TONSTUDIOTECHNIK 4 p eS p x 2 ne i a 2 A x 2 p r af ea 7 r INPUT 8 Ea NE f 2 x ae gn 3 we Pal Pi Pa a z rae p g p j x 7 s pP a A p ae ee p pe a gt Fs P Pi ae oo a PAS 8 a a y W E bem mn O DA CONVERTER O w DIGITAL WORKSTATION DIGITAL COMPRESSOR DIGITAL PEAKMETER DIGITAL ANALOG CONVERTER MONITOR AMPLIFIER RECORDING RECORD A INSERT MONI
11. ectromagnetic emissions are sufficiently low to not interfere with the intended use of other devices and systems The device is sufficiently resistant to electromagnetic interference for its intended use The device has been tested and fulfils the requirements below Safety Protection acc to EN60950 1992 A1 A2 1993 UL1950 EMC Audio video audio visual and entertainment lighting control apparatus for professional use Interference EN55103 1 Immunity EN55103 2 Compliance with these standards ensures protection of the environment and immunity of the device at reasonable levels However it cannot be guaranteed absolutely that no negative effects due to electromagnetic interference occur during the operation of the device The following measures should be taken to reduce the likelihood of electromagnetic interference as much as possible Observe the information in this user manual when installing the device Use shielded cables for all audio channels XLR connectors Ensure proper corrosion resistant connections with a large surface between the shielding and the connector casing Cable shielding terminated on only one end may act as a transmitter or receiver antenna In your system and in the operating environment use only components equipment devices that are themselves compliant with the above standards Provide an earthing strategy that accounts for both safety requirements and EMC aspects Carefully weigh the benefi
12. ed off power switch in order to ensure a centralised reset at start up This cable is used to adapt the level impedance and balance of digital XLR outputs allowing the PAS 8 outputs to be connected to unbalanced coaxial inputs Levels balancing and impedance are converted to standard SPDIF values without any format conversion taking place Please note that the receiving device needs to be able to process the transmitted format The cable is usable for sample rates up to 192 kHz Available lengths 0 5 m 1 0 m 2 0 m and 3 5 m SPDIF gt AES EBU ADAPTER CABLE CASA T This cable is used to adapt the impedance and unbalance of digital SPDIF outputs to balanced 110 Q AES EBU Inputs allowing the PAS 8 inputs to be connected to unbalanced coaxial inputs Balancing and impedance are converted to standard AES EBU values without any format conversion taking place Please note that the receiving device needs to be able to process the transmitted format The cable is usable for sample rates up to 192 kHz Available lengths 0 5 1 0 2 0 and 3 5 m 10 CONNECTIONS BALANCED INPUTS XLR FEMALE BALANCED OUTPUTS XLR MALE All balanced inputs are equipped with NEUTRIK XLR FEMALE jacks with gold plated contacts The pin assignment is according to professional industry standards see figure Protective earth and technical earth are separate in the PAS 8 To prevent ground loops via the input cables XLR pin 1 pin 1 is not wired to
13. ed to pins 3 and 1 of the XLR plug If there is a risk of a ground loop forming between the sending device and PAS 8 then pin 1 should not be connected The shield of the unbalanced signal source will be terminated on pin 3 of the XLR input in this case We offer pre made adapter cables of various lengths as accessories including impedance adaptation from RCA to XLR for digital audio applications In these cables the transmitter s and the recipient s earths are galvanically separated UAS cable and CASA T cable This prevents the formation of a ground loop through this connection The Shielding is terminated on the RCA plug casing MAINS CONNECTOR IN THE BACK PANEL FUSE 50 mAt Always use a power cable with a protective earth conductor and a Schuko POWER 230V 5VA plug included to connect this device to mains power A chassis screw next to the power jack can be used to create a low ohm connection to the rack If the device is used with the AMS 2 audio monitor system this contact should be connected to the chassis jack of the AMS 2 CHASSIS DIGITAL ROUTER PAS 8 CONNECTIONS EXAMPLE CONNECTIONS FOR DIGITAL RECORDING CHANNELS The drawing below shows an example connection for recording signals recording matrix Since AES EBU signals cannot simply be distributed to several recipients in parallel the use of an AES EBU distribution amplifier is recommended for more than 4 digital recipients As an example the following figure ill
14. herent to the design of fast switching analogue and digital matrices The delay between switching off the first signal and switching on the new signal is in the nanosecond range 10 10 s x s RECORD INPUT INPUT2 INPUT3 INPUT4 INPUTS INPUT INPUT7 INPUT8 INS MON INS REC POWER e e O e e e REC CLK PAS 8 EE gG P MON CLK O PROFESSIONAL DIGITAL AUDIO ROUTER L L e FUNK TONSTUDIOTECHNIK Was PAS 8 FRONT PANEL MONITOR SELECT Two symmetrical stereo routers monitor and recording router form the core of the PAS 8 The MONITOR ROUTER is used to select the desired monitor signal RECORD SELECT Selecting the RECORD ROUTER allows a signal to be selected as the recording source independent of the signal source DIGITAL INSERT This button is used to insert an external digital processing unit into the monitor or recording channel NPUT 6 NPUT 5 NPUT 4 N INPUT 2 INPUT 1 00000000 EC o WO O O O O O O TRANSFORMER BALANGED IN a w NPUT 3 W PAS REMOTE RECORD B RECORD A MONITOR B MONITOR A WBINSERT RET HM INSERT SEND INPUT 8 INPUT 7 Ow i o o uke eee TRANSFORMER BALANCED OUT BALANCED IN B BALANC OUT TRANSFORMER BALANCED IN BACK PANEL OPERATION RECORD PAS S INPUT I INPUT2 INPUT3 INPUT4 INPUTS INPUT6 INPUT 7 INPUT 8 TITT DIGITAL INPUT SWITCHOVER The dig
15. ital monitor signal is selected by pushing the corresponding INPUT 1 8 button Selecting a new input turns off the previously selected channel In addition to the digital monitor matrix the router also features a second digital matrix for recording This allows a user to select a signal from inputs 1 8 and use it as the source for a connected digital recorder This is independent from the signal that is currently being monitored Pressing SHIFT and simultaneously selecting a digital source 1 8 activates the digital RECORDING MATRIX and routes the selected signal to the recording output DIGITAL INSERT INS MON INS REC CLOCK DISPLAY REC CLK MON CLK The INS MON and INS REC are used to patch the point of insertion either into the monitor or the recording signal channel The monitor and recording channels are interlocked in order to prevent the insert function to be routed into both channels simultaneously This means that before the insert can be patched into the monitor channel any active recording insert needs to be switched off and vice versa These two LEDs indicate the presence of a digital signal with a valid input level at the selected PAS 8 input For instance if an input with a valid digital signal is selected for the monitor matrix the relevant MON CLK LED green lights up This also happens for non modulated signals digital level 0 as long as the sample rate is present The REC CLK LED red works similarly fo
16. o ee i l est DI 0 05 dutyi mn somone l l nn jH 0 06 Fregi NN 3 01789 MHz 3 00946 3 02916 0 00289 pkpk B83mu B T 691 2 r28 88 1 000 Aner NS tse sd ee lee 0 29 The above diagram illustrates the operating principle of the duty cycle correction The upper red curve shows a highly misaligned input signal with an additional offset in the duty cycle of 30 70 uppermost line of the readings The signal level is approx 3 5 Vss The lower blue curve shows the PAS 8 s corrected clean output signal with a symmetrical duty cycle of typically 50 lines 2 to 5 of the readings The diagram also shows the accurately defined overshoot free rise and fall times as well as the delay between input and output All amplifier stages are optimised for minimum jitter The latency between input and output is approx 60 ns nanoseconds for the monitor channel and 70 ns for the recording channel An active insert in the PAS 8 adds 30 ns These extremely short latencies allow the device to be used even in highly complex synchronous studio systems POWER SUPPLY Protective earth and technical earth are separate in the PAS 8 This isolates the audio circuits from parasitic currents in the 19 inch rack or the protective earth conductor FUSE 50 mAt Technical earth and chassis are connected internally via several parallel 0 047 uF capacitors This creates a low resistance connection that serves as a HF shield while simultaneously preventing the formation
17. of a ground loop for the mains POWER 230V SVA CHASSIS frequency and its harmonics Thanks to these features the matrix is suitable for use with various earthing strategies in the studio oj et pp PAS 8 The router works flawlessly even when exposed to mains voltage fluctuations between 180 and 245 VAC The PAS 8 s stabilised supply voltages are short proof and can be monitored by means of an LED in the front panel The mains fuse is in the power cable socket below the cable gland The duct can be pulled out using a small screwdriver The duct also contains a spare fuse If a new fuse is required only uses fuses of the type 5 x 20 mm 50 mA 250 V anti surge OPTIONAL VERSIONS and ACCESSORIES The PAS 8 is available in two versions for different supply voltages 230 V 50 Hz or 115 V 50 60 Hz Only the manufacturer may convert the device for a different power supply ACCESSORIES INTERFACE In the pack panel of the digital audio router there is a 4 pole mini DIN socket labelled PAS REMOTE It is used for connecting a serial remote controller The remote controller has feedback LEDs for all functions This remote jack also allows for the PAS 8 inputs to be switched via the AMS 2 audio monitor system or the MTX monitor In this case the PAS 8 is supplied with power via the MTX monitor or the AMS 2 and can be controlled simultaneously both at the PAS 8 itself and from the analogue monitor systems The PAS 8 s power supply should be turn
18. p Input impedance 110 Q 1 kQ without internal jumpers transformer balanced free of ground Common mode input voltage max 60V Output voltagel 4 0 V pp at 110 Q Output impedance 110 Q transformer balanced free of earth Common mode output voltage max 60V Rise UME JG 20 ns Delay time input output 60 80 ns Synchronisation external synchronisation is not required Remote control format seriell balanced likewise RS422 Power Supply 230 V 50 60 Hz 115 V 60 Hz optional Power consumption 3 VA FUSO NN 50 mAt 250V 5 x 20 mm Protection class 1 CS steel light grey Front panel aluminium light grey RAL 7035 Dimensions 483 mm x 250 mm x 44 mm width x depht x height Warranty uu uu usss uawawwaskwuwasa 3 years Do not connect signals with levels above 10 Vpp to the inputs as they may damage the device 15 ELECTROMAGNETIC INTERFERENCE and EMC This device complies with the EMC requirements as defined in the directives 89 336 EEC and FCC part 15 The device s el
19. r the selected recording signal DIGITAL FORMAT The 8 inputs of the router s two active digital matrices are designed for AES EBU and AES 3 formats The inputs also accept SPDIF signals as long as the usual level 400 500 mV is maintained A selected signal is patched through to the output e g for an external D A converter and provided buffered to a second output e g for a digital peak meter This applies both to the recording matrix and the monitor matrix The output format is the same as the input format the digital signal is not processed in any way Further processing steps like format conversion signal distribution or sample rate conversion in AES EBU or SPDIF format are available using the DAS SRC or the DDA 12 The PAS 8 is fully transparent for all data in the serial data stream All usual sample rates can be processed including 96 kHz and 24 bit signals INPUT IMPEDANCE All inputs and outputs of the digital router are symmetrical and equipped with transformers The input impedance can also be set later separately for each input by using jumpers Input impedance is gt 1 kQ with the jumper open and 110 Q with the jumper closed This makes it easier to distribute the signal to additional recipients INPUT SIGNAL SPLITTING In order to send a signal not only to the digital switch but also to a second digital recipient the jumper for the relevant input is opened in the router The signal line is routed from the source
20. technical earth internally but to the chassis via an intermediate capacitor This is to prevent interference currents via pin 1 from creating a voltage drop over the ground wire s internal resistance which could potentially interfere with the signal This capacitor acts as an isolator for the mains voltage for all practical purposes while also functioning as a low resistance dissipater for high frequencies All balanced outputs are equipped with NEUTRIK XLR MALE jacks with gold plated contacts The pin assignment is according to professional industry standards see figure Protective earth and technical earth are separate in the PAS 8 To prevent ground loops via the outputs pin 1 pin 1 is not wired to technical earth internally but to the chassis via an intermediate capacitor This is to prevent interference currents via pin 1 from creating a voltage drop over the ground wire s internal resistance which could potentially interfere with the signal This capacitor acts as an isolator for the mains voltage for all practical purposes while also functioning as a low resistance dissipater for high frequencies SPDIF SIGNALS TO BALANCED INPUTS XLR CONNECTOR 232 Ohm If an SPDIF signal is fed in through the XLR inputs the impedance at the connected XLR plug should be adjusted from 110 9 to 75 Q by wiring a 232 Q resistor in parallel between pins 2 and 3 The hot wire of the incoming line is connected to pin 2 the Shielding is connect
21. ts and disadvantages of using a star ground a ground plane or a combined strategy Be careful to prevent the formation of current loops and reduce their unwanted effects by keeping their area as small as possible avoid unnecessarily long cables and reducing any currents by adding a common mode choke SAFETY Only qualified service personnel following all applicable rules and regulations may perform any work inside the device Turn off the device and disconnect the power supply before removing any part of the housing When performing maintenance work on an open device under mains voltage be careful not to contact any bare parts of the circuit or metal semiconductor housings either directly or with a non insulated tool Only use spare parts approved by the manufacturer for the maintenance and repair of safety relevant parts of the device ELECTROSTATIC DISCHARGE ESD Integrated circuits and other semiconductors are sensitive to electrostatic discharge ESD Improper handling of assemblies containing such components during maintenance and repair may degrade the functional characteristics and service life of such parts or cause failure Always observe the following rules when handling components sensitive to ESD Components sensitive to ESD may only be stored or shipped in dedicated designated packaging Any handling of ESD sensitive components outside of their packaging has to take place in electrostatic protected areas EPA e g area
22. ustrates the use of a DDA 12 distribution amplifier in conjunction with the PAS 8 This configuration allows any recipient to record signals from any source The switching options of the DDA 12 permit the signal to be routed to input 2 of the DDA 12 instead of the D A converter or the digital peakmeter Either the monitor or the recording signal can be used as the source Moreover it is possible to send both the monitor and recoding signals simultaneously to different recipients for recording Peano Pascoe Pusch monitor B f MONITOR A EER RET CE ET 8 EN 7 HE 6 RET UT5 Bais BEE 3 JET 2 HET 1 FORMER BALANCED 2J00000000 lt BALANCED BALANC OUT TRANSFORMER BALANCED IN DA CONVERTER DIGITAL PEAKMETER FUSE 50 mAt REMOTE OUTPUT B6 OUTPUT B5 OUTPUT B4 OUTPUT B3 OUTPUT B2 OUTPUT B1 OUTPUT A6 OUTPUT AS OUTPUT A4 OUTPUT A3 OUTPUT A2 OUTPUT A1 INPUT2 2 INPJT 1 l e 000000000000060 TRANSFORMER BALANCED OUT 11 OHM GROUPPB TRANSFORMER BALANCED OUT 11 OHM _GROUPA TRANSFORMER BALANCED IN BALANCED IN ae GE ee E DDA 12 CDR 12 PAS 8 BLOCK DIAGRAM 18B33 S3U i LAO 0803388 i mHaSIV NJS I amp GISNI i 1q3 S3U Ma3 S48 i NES d31 1134 d3111I3 34H YINIEO 4H YINIYO UILTIH 34H YINIEO XIULYW LYASNI 819319 JLAW OLNY
23. vity limit of the measuring device The highest recorded jitter is at approx 1 nanosecond and effective jitter is below 300 ps 107 seconds Signal input was at input 1 Fig 3 Measurement at the PAS 8 monitor output signal input at insert return Despite the measuring device s extremely high resolution it hardly shows any increase of jitter across the whole spectrum compared with fig 1 Again rms jitter is below 300 ps The highest recorded peak jitter is at approx 1 nanosecond 10 seconds Fig 4 Measurement at the monitor output of the PAS 8 Audio signal input was via input 1 at a sample rate of 96 kHz and a level of approx 4 Vss All AES EBU cables have lengths of approx 2m Rms jitter is below 150 ps The highest recorded peak jitter is at approx 420 ps 14 Number of inputs 8 Inputs 1 Insert return Number of output 2 Monitor 2 Record 1 Insert send Connector inputs XLR female gold plated contacts Connector outputs XLR male gold plated contacts Digital format AES EBU AES 3 also SPDIF with adapter plug transparent for all formats Sampling frequency depends from input signal 25 105 kHz Input voltage range 300 mV 5V p
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