Bright-VU Meter
Contents
1. unm rz 5 he lt L6 unr ZZ i 99 QNS ut La ga od Z Sd Z vd o z Zo vely oL o o gHLZcec 91 S M 119 dsa 9 t sa ea iaf sa b FT ro oe MST 6 89 gl ee 3 za ota za y vaa Eata nA 1H9138 RS sd ERE us ndNI SOTWNY S 5 va id eq aa vol c ca i s ps09 ouo Ld 90 avi a Trap va 1X3 uo aow j o NT aj PAER mm ozo KILO Sojsisas sen Oo 9 99 Id 90 4 Z eed ez LLS CHOIVNTASI z oa Id ea oe Ui 1S9 Tsy iss s0164 c oo La S1QL za Los Le2. 7 S 9 Lo gitek BRIGHT VU LED Audio Level Display Operation amp Service Manual Logitek Software License Agreement The Bright VU unit you have purchased contains embedded software The software is owned by Logitek Electronic Systems Inc and is protected by United States copyright laws and international treaty provisions Logitek grants to you the right to use one copy of the embedded soft ware in each Bright VU meter you purchase You may not rent or lease the software You may not reverse engineer decompile disassemble or cre ate derivative works from the software You may not create copies of the software This statement will be governed by the laws of the State of Texas U S A Logitek reserves all rights not specifically granted in this statement All information contained herein is confidential No portions of this manual may be reproduced by any means without written permission from Logitek Electronic Sys tems Inc COPYRIGHT 1995 LOGITEK ELECTRONIC SYSTEMS INC Bright VU LED Meter INSTRUCTION MANUAL Table of Contents SECTION 1 GENERAL INFORMATION 1 1 General Description AA eni aa aa a a kaa eeen 1 2 Electrical Specifications 1 3 Instrument Identification 1 4 Wheretofindhelp SECTION 2 PREPARATION FOR USE 2 Initial In
3. Bright VU peak attack time is slightly faster 3 3 Using Alignment Tones The Bright VU always displays the actual meas ured values of the input signal If a constant level sine wave is applied to the meter the PPM dot will be about 3 dB above the VU bar This is dueto the difference be tween the average and peak value of a sine wave The size of the VU to PPM difference is a function of signal wave shape and the only signal that has the same VU and PPM reading is a square wave 3 4 User Maintenance The chassis and display windows of the unit may be cleaned using a mild detergent or isopropyl alcohol and a soft cloth Do NOT use abrasive cleaners or aro matic solvents to clean the Bright VU meter units WARNING The inside of the Bright VU contains no controls or user serviceable parts The cover should only be re moved by competent technical personnel capable of servicing this type of equipment Hazardous voltages exist on the underside of some circuit cards ock ck ck ck ck ck ck Ck ck ck Ck ck Ck Ck ck Ck ck ck ko ck k ko k kk Logitek will be happy to provide further information for servicing the unit Please contact the factory or your Logitek dealer for further information Bright VU Instruction Manual 3 5 Resetting the Program The Bright VU contains software that executes on a programmable DSP integrated circuit If the processor memory becomes corrupted the meter may functio
4. Circuits Charge pump 8 pin dip socket Connectors 3 pin large header locking 3 pin large socket Power entry module fuse holder Switches Slide DPDT Transformers 10V 2 4A International Circuit card Power cord North America NC NMC1206Z5U104M50T AV TAP106K025HSB PN 051 010 153 PN 050 010 455 QT MV54124A QT MV53124A HP HLMP T400 QT MV57124A QT MV54124A QT MV53124A HP HLMP T400 QT MV57124A MM MAX7219CWG CK TS01 C K E LG 273A Bright VU Display IL 688LBA035M2CD CE UK50 104 NI UFS1E101MPJ GI GBPC 602 LF 218 500 LT LT1054CN EM 100 083 10 1003 PN MLSS156 3A PN CE156F20 3A SR 6200 4115 CK L202 121MS02QE SI IF 24 16 LG 253A Super VU Supply BE 17251 Page 13 SYMBOL DESCRIPTION LOGITEK PART NUMBER 5 6 ADC Input Card Capacitors C1 4 75pf 1000V ceramic CE DD 750 C5 6 4 7uf 25V tantalum AV TAP475K025CCS C7 8 2200pf 50V ceramic SMD NC NMC1206NPO222K50TR C9 12 1uf 35V tantalum AV TAP105K035HSB C13 14 4 7uf 25V tantalum AV TAP475K025CCS C15 1 uf 50V ceramic SMD NC NMC1206Z5U104M50T C16 17 470pf 100V ceramic SMD AV 12061A471JATMA C18 1 uf 50V ceramic SMD NC NMC1206Z5U104M50T C19 01uf AV 12065E103MATMA C20 21 1uf 35V tantalum AV TAP105K035HSB C22 01uf AV 12065E103MATMA C23 1 uf 50V ceramic SMD NC NMC1206Z5U104M50T C24 25 470pf 100V ceramic SMD AV 12061A471JATMA C26 1 uf 50V Z5U SMD 1206 NC NMC1206Z5U104M50T Diodes D1 2 5 4V zener GI 1N4734A Integrated Circuits IC1 2
5. EBU signals but should be limited to 10 feet with S PDIF signals and cables S PDIF signals using RCA type plugs may be con nected to the input using an RCA to XLR adapter Coax cables using BNC connectors can be connected to the input using a BNC to XLR adapter Both of these are available from Logitek AES EB nnection Pin 1 Shield Pin 2 Signal Pin 3 Signal Pin 1 and the shell of each XLR is attached directly to the chassis at the connector These shielding com ponents do not share a ground path with any of the in ternal circuitry One end only shield connections are NOT recommended when using digital input models Itis also important to set the two input load switches located between the two XLR connectors Sw1 Sw2 Ohms Use Up Up 2200 Loop through mode Up Dn 110 Balanced twisted pair XLR Dn Up 75 Unbalanced coax RCA amp BNC Dn Dn 44 do NOT use this setting The Bright VU is set so that full scale maximum code will light the top bargraph LED 18 dB Page 5 2 8 Connecting Analog Input Models The Bright VU accepts balanced or unbalanced in puts via rear panel XLR connectors on analog input only models or 3 circuit 1 4 phone plugs on dual input models The connectors are wired as follows Balanced Connection Pin 1 or Sleeve Shield Pin 2 or Tip Signal Pin 3 or Ring Signal nbalan nnection Pin 1 or Sleeve Shield
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7. Inspect all equipment for damage immediately after unpacking Bent and broken parts dents and scratches should be noted If damage is found referto paragraph 2 2 for recommended claim procedures Keep all packing material for possible future use 2 2 Claims If the unit has been damaged notify the carrier im mediately File a claim with the carrier and advise Lo gitek of such action to arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 3 Repacking for Shipment If the unit must be returned to Logitek attach a let ter to it showing the owner s name and address A de scription of the necessary service should be included in the letter The original shipping carton and packag ing materials should be used for reshipment if possi ble Use FRAGILE labels on each surface Return the unit freight prepaid Be sure to insure the unit for its full value The unit will be repaired promptly and returned freight prepaid 2 4 Installation The Bright VU models are designed to be mounted in a standard 19 equipment rack by using the four mounting holes in the corners of the front panel Plas tic washers should be used to keep the mounting screws from marring the front panel finish While flow through ventilation is not necessary the units should not be mounted directly above equipment which produces significant heat such as equipment using vacuum tubes The unit should never be oper at
8. Pin 2 or Tip Center Hot Pin 3 or Ring Connect to pin 1 The Bright VU shield pins are bonded directly to the chassis at the connector and do not share any ground paths with the internal circuitry This allows ca ble shields to be connected at both ends without caus ing hum problems The zero reference level for each input can be set anywhere between 10 dBu and 20 dBu by adjusting the multiturn gain control located adjacent to each in put connector A small flat blade screwdriver is needed to adjust the gain 2 9 Alarm Output Bright VU units ordered with the alarm option have a SPST relay closure that can be triggered by several selectable fault conditions The relay contacts are brought out on the rear panel terminal block The alarm function is controlled by an eight position DIP switch located on the DSP control card inside the enclosure To gain access to the DIP switch you must remove the meter cover plate The following tables de scribe the alarm parameters available Alarm Control Sw7 Function Off Alarm output OFF On Alarm output ON Too Low Alarm Sw1 Sw2 Function Off Off 20 dB below 0 dB Off On 30 dB below 0 dB On Off 35 dB below 0 dB On On 45 dB below 0 dB Page 6 Too High Alarm Sw3 Sw4 Function Off Off 3 dB above 0 dB Off On 6 dB above 0 dB On Off 9 dB above 0 dB On On 12 dB
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10. amp which is slower than the SSM2143 such as the TL072 used here A faster op amp like the NE5532 will cause the output of IC4 to oscillate kk ck ck ck ck ck ck ck ck ck Ck ck Ck ck ck Ck ck Ck ck ck ck ck ck ko k kk Signal from IC1b is fed through anti alias filter R14 C8 and DC isolated by C11 before connecting to the left input of the sigma delta analog to digital converter IC7 The right channel connects to the converter via similar circuitry The 12 288 MHZ master clock input to the ADC is generated by a crystal oscillator located on the DSP control card Combined left and right audio data is sent synchronously data clock frame sync to the DSP in 64 bit strings via connector P3 The reset sig nal from the DSP control card is also connected to the ADC The DSP activates the reset once a day which causes the ADC to perform a self calibration routine for about half a second If the meter has undergone a substantial temperature change it may generate noise up to 70 dBFS until it undergoes a calibration cycle The three supply voltages from P3 are EMI isolated by ferrite beads FR1 FR2 and FR3 before connecting to the other circuitry IC5 and IC6 supply low noise regulated 5 VDC to the analog portions of the cir cuit The digital part of the data converter gets its 5 VDC from the DSP control card Page 10 Bright VU Instruction Manual SECTION 5 REPLACEMENT PARTS LIST All replacement parts are stocked in de
11. the LED drivers on the display cards The front panel PPM VU slide switches are con nected directly to the low byte of the DSP address port Serial data is sent synchronously data clock load to the LED driver chips via display connectors P5 and P6 in 16 bit strings Data is placed on the top bit of the DSP data port and clocked into the display drivers via a write to address decoder IC2 Other writes to IC2 will load the 16 bit strings into the left or right side display driver Bright VU Instruction Manual Two channel audio data is fed synchronously data clock frame sync to serial ports on the DSP via input connectors P1 and P2 If the control card is only driving one display then the DSP IC4 will only have one serial port which will be connected to P1 In this case only left side connectors P1 and P6 will be active 4 6 Analog In r The audio from the left input XLR connector J1 is connected to a RF lowpass filter formed by R1 R2 C1 and C2 The resistors also form a 9 dB pad with the in put impedance of balanced receiver IC1 1C1 provides an additional 6 dB pad between its input and output These pads allow 20 dBu input signals to be handled by the 5 volt supply rails Signal gain is adjusted via trimpot R7 which is the feedback resistor around gain stage 1C3a Signal from IC3a is fed through anti alias filter R9 C5 and DC isolated by C8 before connecting to the left input of the sigma delta analog to digital
12. to the fuse holder WARNING Do NOT replace the fuse without first disconnecting the meter s power cord from the wall socket as dan gerous voltages are present which may cause electri cal shock Always use fuses of the same value and type as specified in this manual Do NOT use fuses of a higher value than those specified as a shock hazard and a fire hazard may result ock ck ck ck ck ck ck Ck ck ck Ck ck Ck ck ck Ck ck Ck ck ck ck ck ck ko k kk A blown fuse is most often although not always a symptom of another failure Related circuitry should always be carefully examined after any fuse failure especially if a replacement fuse also blows 4 3 Handling of CM Integr ircui All logic components in the Bright VU meter are CMOS type integrated circuits Even though all cir cuits have built in static discharge protection special care must be taken in the handling of these devices particularly in dry environments Page 8 IMPORTANT NOTE Do NOT remove or handle CMOS integrated cir cuits except in a grounded environment which is free of the risk of static electricity Store such circuits on conductive foam or in anti static containers Do NOT store on styrofoam or other plastic sheets Improper handling may damage these devices kkk ck ck ck ck ck ck ck ck Ck ck Ck ck ck Ck Ck Ck ck Ck Ck ck ck ck ko ko 4 4 A ircui r The internal components of the meter are ac cessed by removing the eight sc
13. to the red and green output pads The voltage should be be tween 8 to 10 VDC with less than 5 volt of ripple Analog input models will also have a charge pump consisting of IC1 and C3 that feeds filter C4 and the black output pads The voltage should be 8 to 10 VDC with less than 2 volt of ripple Jumpers soldered to the output pads feed power to one or two DSP control cards WARNING Dangerous voltages from the AC mains are present on the bottom of the power supply card Always dis connect the AC power cord when servicing this circuit board Always completely reinstall this board before reconnecting the power cord ok ck ck ck ck Ck ck Ck ck ck Ck ck Ck ck ck Ck ck Ck ck ck ko ko k kk 4 10 ADC Input Card The audio from the left input 1 4 phone connector J2 is connected to a RF lowpass filter formed by R10 R11 C3 and C4 The resistors also form a 9 dB pad with the input impedance of the balanced receiver IC4 IC4 provides an additional 6 dB pad between its input and output These pads allow 20 dBu input signals to be handled by the 5 volt supply rails The output of IC4 is unity gain inverted by op amp IC2b and fed back to the reference input of IC4 This enables IC4 to pres ent an identical resistive load on its two input pins In put gain is adjusted via trimpot R9 which is the feedback resistor around gain stage IC1b Page 9 IMPORTANT Only replace IC2 with an op
14. 00pf 50V NPO SMD ceramic 1uf 35V tantalum 1uf 50V SMD ceramic 470pf SMD 4 7uf 25V tantalum 01uf SMD LOGITEK PART NUMBER AV TAP106K025HSB NC NMC1206Z5U104M50T CE DD 250 CE DD 150 MO 1N4734A PN 051 010 153 PN MLSS156 3A PN MFSS100 3A PN 051 010 153 PN 050 010 455 PN CE156F20 3A PN CE100F28 3A CT MP122 MM MAX1232CPA MO SN74HC138N CA CAT28C64BN 15 AD ADSP 2115 KP40 AD ADSP 2105 KP40 MO MC7805CT EM 100 083 10 1003 EM 100 163 10 1003 EM 150 032 11 02 EM 150 068 11 02 CT 770 61 R123 LG 270 Bright VU Control CE DD 750 NC NMC1206NPO222K50TR AV TAP105K035HSB NC NMC1206Z5U104M50T AV 12061A471JATMA AV TAP475K025CCS AV 12065E103MATMA Page 7 7 SYMBOL DESCRIPTION LOGITEK PART NUMBER D1 2 J1 2 P3 J3 IC1 2 IC3 IC4 IC5 IC6 3 DC R1 4 R5 6 R7 8 R9 10 1 pc 5 3 Digital Input Card C1 C2 4 C5 6 C7 D1 J1 J2 P3 J3 IC1 IC2 H1 R2 R3 R4 SW1 2 T1 1 pc Page 12 Diodes 5 6V zener 1 watt Connectors Female XLR pc 10 pin dual row header 10 pin dual row socket Integrated Circuits Balanced line receiver Quiet op amp ADC 16 bit stereo 5 VDC regulator 100ma 5 VDC regulator 100ma 8 pin dip socket Resistors 21K 1 4220 1 50K multi turn trim 300 Circuit card Capacitors 047uf 50V 1uf 50V SMD ceramic 4 7uf 25V tantalum 1uf 35V tantalum Diodes 5 6V zener 1 watt Connectors Female XLR pc Male XLR pc 10 pin d
15. 05 129 VAC or switch settable 220 240 VAC Power Requirement BV2 all amp BDT all 5 watts BV4 all 10 watts BV6 all 15 watts Dimensions 19 W x 7 D x 1 H 6 W x 6 WD x 2 VH 1RU enclosure Desktop case Page 4 1 3 Instrument Identification The Bright VU is identified by a model number and a three or four digit serial number The model number and serial number appear on a label on the back of the unit near the power cord All correspondence to your Logitek dealer or to the Logitek factory should refer to the model number and serial number 1 4 Where to find help Logitek customer service personnel are available to help with any questions comments or problems you might have with the Bright VU meter both during and after the warranty period Our hours of operation are 8AM to 5PM central time We may be contacted in one of the following ways By Phone 877 231 5870 U S A amp Canada or 713 664 4470 By Fax 713 664 4479 By E mail help logitekaudio com By Mail Logitek Electronic Systems Inc 5622 Edgemoor Drive Houston TX 77081 USA Bright VU Instruction Manual SECTION 2 PREPARATION FOR USE 2 1 Initial Inspection Check the shipping carton carefully for external damage If the carton shows evidence of abuse ask the carrier s agent to be present when the unit is un packed Carefully unpack the unit to avoid damaging the equipment through the use of careless proce dures
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17. ED WARRANTY Logitek Electronic Systems Inc warrants its pro fessional equipment excluding Logitek Software which is covered by a separate warranty against de fects in materials and workmanship for two years pur suant to the following terms and conditions The warranty extends to the original purchaser only LOGITEK will repair or replace at its option at its factory without charge professional equipment if a de fect in materials or workmanship develops during the first two years following purchase when the equip mentis returned to the factory or LOGITEK authorized service centers freight prepaid with a description of the nature of the failure No reimbursements can be made for repair charges that are not factory autho rized After repair or replacement LOGITEK will re turn the equipment to the purchaser freight prepaid In the event that any part of this professional equip ment becomes defective during the first two years fol lowing purchase and purchaser wishes to attempt repair purchaser may obtain a replacement part by notifying LOGITEK of the part of the equipment which has failed LOGITEK will thereafter ship a replace ment part freight prepaid LOGITEK may require the purchaser to return the defective part to LOGITEK freight prepaid as a condition of such replacement ei ther before or after LOGITEK ships the replacement part LOGITEK shall not be responsible for any other charges or liabilities associated with pu
18. IC1 controls the 40 display LEDs by scanning them in a six by eight matrix Segment lines are current controlled and con nected to the LED anodes Digit lines connect to the LED cathodes Scanning is accomplished by taking each digit line low one at a time and sourcing current Bright VU Instruction Manual from the segment lines for whichever of the 8 LEDs in a digit group need to be lit The display driver accepts synchronous serial data clock data load from the DSP on the control card in 16 bit strings composed of an address byte and a data byte About once a second the DSP sends a complete set of setup codes for the display driver If the display card is plugged in while the meter is running it will re main blank for a moment until these codes are re ceived 4 9 Power Each Bright VU contains a ground isolated and fil tered step down power supply to create the necessary operating voltages This supply is located on a PCB on the right side of the meter enclosure Mains AC from the power entry module J2 is fed through fuse F1 located in a drawer under the power cord in J2 to J1 on supply card LG 253 J1 feeds volt age selection switch S1 which connects the dual pri maries of transformer T1 in series for 280 VAC operation or parallel for 115VAC operation The dual secondaries of T1 are wired in parallel and loaded with a full wave bridge rectifier RT1 The DC output of RT1 is filtered by capacitors C1 and C2 and fed
19. ION DAMAGES OR COSTS RELATING TO THE LOSS OF PROFITS BUSINESS GOODWILL DATA OR COMPUTER PROGRAMS EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAM AGES IN NO CASE SHALL LOGITEK S LIABILITY FOR MONEY DAMAGES EXCEED THE AMOUNT PAID BY YOU FOR THE LOGITEK EQUIPMENT OUT OF WHICH SUCH CLAIM AROSE THE FOREGOING LIMITATIONS SHALL NOT APPLY TO CLAIMS RELATING TO DEATH OR PERSONAL IN JURY WHICH ARISE OUT OF PRODUCTS DEEMED TO BE CONSUMER GOODS UNDER APPLICABLE LAW Some states or provinces do not allow the exclu Sion or limitation of implied warranties or limitation of liability for incidental or consequential damages so the above exclusion or limitation may not apply to you The warranty and remedies set forth herein are ex clusive and in lieu of all others oral or written express or implied No Logitek dealer distributor agent or employee is authorized to make any modification or addition to this warranty Bright VU Instruction Manual
20. Neutrik Lakewood NJ PN Panduit Corp Tinsley Park IL QT Quality Technologies Sunnyvale CA SI Signal Transformers Co Inwood NY SR Schurter Inc Petaluma CA SS Schott Corp Minneapolis MN Bright VU Instruction Manual Page 15 SECTION 7 DIAGRAMS Page 16 Bright VU Instruction Manual p6 UDP IE woubolg uauodwog 65 91 AlddNS NAN NAE NAS Aluo ZAN Puo ZSIS S opou uo pesn o1D Son o osou LE ves E lddaNS amp 8d3MOd S opou A uo indui DJ IP uo pesn JOU ol 3L10ON qA6 s resori oo ANE OO di 11 eo VO gt bot fe g s OVA Ee gt OVA SIS 0089 S Oez SLL m er NSI me L OO a Lo 9 ae 1 d Oan 4 EL LMS Q3M zOo9 odg89 D Y lt m d LLS z LLP MO qQ O S duo t L 91 1 o g La 9 LL NES Page 17 Bright VU Instruction Manual
21. Quiet op amp SG NE5532N IC2 3 Balanced line receiver AD SSM2143P IC5 5VDC regulator 100 mA MO MC79L05ACP IC6 5VDC regulator 100 mA MO MC78L05ACP IC7 ADC 16 bit stereo AD AD1877JR 4 pcs 8 pin dip socket EM 100 083 10 1003 Connectors J1 2 Phone jack switch PC SW RN 114BCP J3 10 pin dual row socket PN 050 010 455 Ferrites FR1 3 Ferrite bead MU BLM32A07PB Resistors R1 2 21k 196 DL RNC55H2102BS R3 7 4220 196 R8 9 50K multiturn trimpot MP CT9X503 R10 11 21K 1 DL RNC55H2102BS R12 4220 1 R13 14 300 1 pc ADC Input circuit card LG 264A Page 14 Bright VU Instruction Manual SECTION 6 MANUFACTURERS LIST CODE MANUFACTURER LOCATION AD Analog Devices Inc Norwood MA AV AVX Stantel Corp Myrtle Beach SC BE Belden Richmond IN CA Catalyst Semiconductor Santa Clara CA CE Centralab Electronics Div Milwaukee WI CK C amp K Components Newton MA CS Crystal Semiconductor Austin TX CT CTS Elkhart IN DL Dale Tempe AZ EM Ecam Technology Scottsdale AZ Gl General Instruments Quality Technologies Sunnyvale CA HP Hewlett Packard Opto electronics Div Santa Clara CA IL Illinois Capacitor Lincolnwood IL LF Littlefuse Des Plaines IL LG Logitek Circuit cards Houston TX LT Linear Technologies Milpitas CA MM Maxim Integrated Products Sunnyvale CA MO Motorola Semiconductor Products Phoenix AZ MP Mepco Electra Inc San Diego CA NC NIC Components Amityville NY NI Nichicon Corporation Schaumburg IL NT
22. S 91 lt 3 as G kK Sa F ZI sz E lt i S o JI lt 8 J uj d oas ie 1 vui Hd B Id 6 L 6 dsl of fd e o fe lz gale 1ndu JAN 1M jndu Jan 11 c eb Z 1 96 5nv 0z uoJ5opid jueuoduoj Q 2 91 AV dSId NA LHOI HE Blt Gilt ZH 6 9 f z H 0 e Br A Ol Gl 0Z GZ 0e ee Ova Jeca gea ed 9 0 Sea wea ed Zea rea ofa eza geal zaj oza szaj vzaj zaj eea LEO oza fera 8Id i0 era era via era era lid Jora 6a sa za 9a SQ a ca zal ta z9 LLC 91 1NdNI 901VNV e OL d la B i d ol Ol 9 3 rm co v FEES ea s BS mg c 03 NJ 8 SJ amp gig EET o EIJ g BE go ci BIS a Se e M le c oo00 0 S o g S a a 9 wi u 92 E as ES A dd 34 OLY dk cud Aa Z9 gr P CA zr i MIX 31VW34 MIX 31VW33 su 0 Sl gy za IS OIL O jndu 3497 indu ybiy G6 990 6 MoJbpid 1ueuoduoj Z Z 9 1ndNI WLIDIG 0L 7 6 d e CD d oF e Q e LL Ol NJ 9 cui 33 ZU Ga NOI Zd IF MIX JIN TX 31VW33 zi xm N nd no doo 10 161g ynduj joy 161g Page 19 Bright VU Instruction Manual Lo gitek TWO YEAR LIMIT
23. above 0 dB Alarm Activation Delay Sw5 Sw6 Function Off Off 30 Seconds of continuous fault Off On 60 Seconds of continuous fault On Off 120 Seconds of continuous fault On On 300 Seconds of continuous fault Peak Displ ntrol Sw8 Function Off Peak Dot OFF On Peak Dot ON The alarm output is available on the rear panel DIN connector All alarms within a single unit share the same relay Wire a 5 pin male DIN connector as fol lows Male DIN solder side Relay Relay Bright VU Instruction Manual SECTION 3 OPERATING INSTRUCTIONS 3 1 Bargraph Description The Bright VU meter display contains two multi LED bargraph displays mounted one above the other The top bar shows left channel and the bottom bar shows right channel The 20 segments are arranged in four color groups The 35 to 1 dB segments are green the 0 dB segment is yellow the 1 to 3 seg ments are orange and the 6 to 18 dB segments are red Average VU levels are shown as a solid bar while peak PPM levels are shown as a single dot 3 2 Display Ballistics In the PPM mode the display has essentially O at tack time and a 2 8 second per 24 dB release time In average mode the display has an attack and release time of approximately 300 milliseconds per 20 dB These ballistics conform the international standards with the exception that the
24. converter Right channel connects to the converter via similar cir cuitry The 12 288 MHZ master clock input to the ADC is generated by a crystal oscillator located on the DSP control card Combined left and right audio data is sent synchronously data clock frame sync to the DSP in 64 bit strings via connector P3 IC5 and IC6 supply low noise regulated 5 VDC to the analog portions ofthe circuit The digital part of the data converter gets its 5 VDC from the DSP control card 4 7 Digital Input Card Serial digital audio in the AES EBU or S PDIF for mat enters the card via XLR connector J1 and is di rectly connected to the output connector P2 Note that no buffering is applied to the loop through output The input data signal is connected to pulse trans former T1 via DC blocking capacitor C2 The output of T1 is loaded with R1 R2 or R3 depending on the load required and connected to data receiver IC1 C1 and R4 from a loop filter used by IC1 to recover the embed ded clock from the coded input signal IC1 separates the audio data channel data and clock from the input signal The audio is sent to the DSP in 64 bit strings via connector P3 IC2 creates a low noise 5VDC for use by the ana log front end of IC1 The voltage is stabilized by C6 amp C3 and is clamped against over or reverse voltage by D1 4 8 LED Display Card Regulated 5 VDC from J1 is stabilized by C1 C2 and connected to LED display driver IC1
25. ed if the ambient temperature is above 55 degrees C 131 degrees F 2 nnecting Mains Power Connect the meter to the power mains with the en closed power cord The unit is factory set for 115VAC operation but 230VAC operation can be selected viaa slide switch located next to the power transformer in side the unit To gain access to the voltage select switch remove the enclosure top cover The switch is located adjacent to the large power transformer The mains connector is an IEC standard power entry mod ule and may be used with any IEC type power cord of 15 amps or less Bright VU Instruction Manual 2 6 Input Selection on Dual Input Models If the digital receiver can lock onto an input signal then the meter will display that signal whether it con tains errors or not If no signal is connected to the digi tal input orthe data rate is out of the receiver s capture range then the meter will display the analog signal This happens even if nothing is connected to the ana log inputs 2 7 nnecting Digital In M The Bright VU accepts AES EBU or S PDIF serial data at sample rates of 30 000 to 50 000 samples per second via a female XLR connector on the rear panel The input is also wired directly to the male XLR con nector on the back panel for use in loop through mode The loop through connector provides a convenient way to daisy chain several pieces of equipment off of one digital output Loop through works well with AES
26. n incorrectly or fail to operate altogether In most cases an independent watchdog circuit will notice that the meter is working incorrectly and restart the system The processor can be reset manually by turning the power off for fifteen seconds and then back on again Page 7 SECTION 4 SERVICING 4 1 General Information The Bright VU is designed to need a minimum of maintenance for long trouble free operation Should repair be necessary the technician should first read the information in the manual concerning the circuits in question and should follow proper procedures for testing and replacing semiconductors Logitek engi neers are readily available at the factory to provide technical assistance both during and after the war ranty period WARNING The inside of the Bright VU contains no controls or user serviceable parts The cover should only be re moved by competent technical personnel capable of servicing this type of equipment Hazardous voltages exist on the underside of some circuit cards ock ck ck ck ck Ck ck Ck Ck ck Ck ck Ck ck ck Ck ck Ck ko k ko ko k kk 4 2 Fuse The primary winding of the power transformer is fused with a amp slow blow 20mm fuse housed in a fuse holder in a slide out drawer under the power cord on the rear panel of the unit It should only be replaced with fuses of the same type and current rating The power cord must be unplugged from the rear panel to gain access
27. pth at the Logitek factory Most are also available through local electronic parts distributors For your convenience in purchasing replacement parts locally we include the following parts list All Logitek part numbers consist of a two letter manufacturer code followed by that manufacturer s standard part number for the item A list of manufacturers arranged alphabetically by manufacturer code follows this parts list in Section 7 All resistors are 1 4 watt 5 tolerance unless otherwise noted YMBOL 5 1 DSP Control Card C1 2 C3 5 C6 C7 D1 P1 2 P3 P4 P5 6 4 pcs 1 pc 1 pc Y1 IC1 IC2 IC3 IC4 IC5 1 pc 1 pc 1 pc 1 pc R1 R2 1 pc 5 2 X Analog Input Card C1 4 C5 6 C7 12 C13 15 C16 19 C20 23 C24 26 Bright VU Instruction Manual DESCRIPTION Capacitors 10uf 25V tantalum 1uf 50V SMD ceramic 25pf 1000V ceramic 15pf 1000V ceramic Diodes 5 6V zener 1 watt Connectors 10 pin dual row header 3 pin large header locking 3 pin header 10 pin dual row header 10 pin dual row socket 3 pin large socket 3 pin socket on regulator Crystals 12 288 MHz Integrated Circuits uP monitor 3 to 8 decoder EEPROM 8k x 8 150ns DSP 16 bit drives 2 displays DSP 16 bit drives 1 display 5 VDC regulator 8 pin dip socket 16 pin dip socket 32 pin PLCC 68 pin PLCC Resistors 10K 12K 2 5 position bussed Circuit card Capacitors 75pf 1000V ceramic 22
28. r chaser made repairs No part or equipment shall be considered defective if it fails to operate due to exposure to extreme temper atures or excessive moisture in the atmosphere Light bulbs batteries potentiometers or other equipment not manufactured by Seller shall carry only the warranty if any of the original equipment manu facturer in effect at the time of shipment of this order and Seller s obligation under this warranty shall be limited to such adjustment as Seller may obtain from the original manufacturer This limited warranty is void if equipment is modi fied or repaired without authorization subjected to misuse abuse accident water damage or other ne Page 20 glect or has had its serial number defaced or removed No obligation is assumed by LOGITEK to update previously manufactured equipment Specifications are subject to change without notice EXCEPT AS SPECIFICALLY PROVIDED HEREIN LOGITEK MAKES NO WARRANTY REPRESENTATION PROMISE OR GUARANTEE EITHER EXPRESS OR IMPLIED STATUTORY OR OTHERWISE WITH RESPECT TO THE EQUIPMENT USER DOCUMEN TATION OR RELATED TECHNICAL SUPPORT IN CLUDING THEIR QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR A PARTIC ULAR PURPOSE IN NO EVENT WILL LOGITEK BE LIABLE FOR INDIRECT SPECIAL INCIDENTAL TORT ECONOMIC COVER OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF OR IN ABILITY TO USE LOGITEK PRODUCTS EQUIP MENT OR SERVICES INCLUDING WITHOUT LIMITAT
29. rews that attach the top cover and removing the cover 4 5 DSP Control Card Filtered 9 VDC from power connector P3 is fed to the 5 VDC regulator IC5 via connector P4 9 VDC as well as 9 VDC from P3 is also passed to the input cards via connectors P1 and P2 The 5 VDC output of IC5 is clamped against over voltage and voltage rever sal by zener diode D1 Distributed power is filtered by C1 C2 C3 C4 and C5 In addition to powering all cir cuits on this card IC5 also supplies 5 VDC to the in put and display cards via connectors P1 P2 P5 and P6 On power up the DSP is kept in reset by IC1 until the power has stabilized ensuring a good power on reset IC1 also contains a watchdog timer that will re set the DSP if its ST pin in not taken low at least once every 150 mSec This pin is normally pulsed low every 5 mSec by a DSP write to address 0 The DSP IC4 is clocked by a 12 288 MHZ crystal oscillator consisting of Y1 C6 C7 and an IC4 internal driver IC4 pin43 is a buffered output of the oscillator andis used as the master clock for the analog to digital converters on the analog input cards The first thing the DSP IC4 does after reset is copy its program from EEPROM IC3 to its internal memory Note that the 8 bit data bus from the EE PROM is connected to the middle byte of the DSP s 24 bit data port Address decoder IC2 is used to reset the watchdog timer IC1 and supply the serial bit clock and load sig nals to
30. s 5 8 Digital Input Card neee 5 4 LED Display Card 5 5 Power Supply exu dek NER OP aan eae n oad 5 6 ADC Input Card nnee SECTION 6 MANUFACTURERS LIST SECTION 7 DIAGRAMS SECTION 1 GENERAL INFORMATION 1 1 General Description The Logitek Bright VU is a bargraph type audio level meter featuring two LED bargraphs Average level is always shown and is displayed as a solid bar PPM is displayed as a single dot The meters accept either analog audio or serial digital inputs and are available in three 19 inch rack mount configurations all with internal power supplies 1 2 Electrical ification Bargraphs per meter Two Indicators per bargraph 20 Scale Range 35 dB to 18 dB 0 dB Reference Point Analog Input adjustable 20 to 10 dBu Digital Input 19 dB full scale Response Time VU Mode 300 mSec 20 dB attack 300 mSec 20dB release PPM Mode 0 mSec attack 2 8 Sec 24 dB release Frequency Response 1dB 20 20K hz Analog Input Sensitivity 10 to 20 dBU for full scale rear panel adjustable 24 dBm 40K Ohm balanced 20K Ohm unbalanced CMRR 80 dBu Overload Level Impedance Connector Female 3 pin XLR Digital Input Codes AES EBU S PDIF Impedance 110 Ohm balanced 75 Ohm unbalanced 2200 Ohm balanced transformer balanced Female 3 pin XLR IN Male 3 pin XLR OUT Loop through Termination Connector AC Line Input Voltage 50 60 Hz 1
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32. spection ness sausen doe hah ES SR i dva WA 2 2 Claims i2 nas eer ERA bbe ue Sur E axe Od d eeu s dte Y da 2 3 Repacking for Shipment 2 4 Installation EE sews ze RR eR Ee nee eee eel ead eds 2 5 Connecting Mains Power 2 6 Input Selection on Dual Input Models 2 7 Connecting Digital Input Models 2 8 Connecting Analog Input Models 2 9 Alarm Output za cessere rmm de Y E Re reen qnom d us SECTION 3 OPERATING INSTRUCTIONS 3 1 Bargraph Description 3 2 Display BallistiCS a anssen rente adat get 3 3 Using Alignment ToneSs 3 4 User Maintenance 3 5 Resetting the Program SECTION 4 SERVICING 4 1 General Information eenen 42 USC PE 4 3 Handling of CMOS Integrated Circuits 4 4 Access to Circuit Cards 4 5 DSP Control Card 4 6 AnaloginputCard 4 7 Digital Input Card eeen 4 8 LED Display Card 0 0 00 ccc eh 4 9 Power SUDplV sss eda re edP ERR EB Up EU ERU Qd Ad re RN tg des 4 10 ADC Input Card arne ei c e dee i ala ae e Ta SECTION 5 REPLACEMENT PARTS LIST 5 1 DSP Control Gard eee ee 5 2 Analog Input Card ss enen lr hc eka oes ewe seem adu ee
33. ual row header 10 pin dual row socket Integrated Circuits AES EBU receiver 5 VDC regulator 100ma Resistors 2200 110 75 1000 Switches 2 position SPST dip lever Transformers AES EBU Circuit card MO 1N4734A NT NC3FK H PN 051 010 153 PN 050 010 455 AD SSM2143P AD OP275GP AD AD1877JR MO MC79L05ACP MO MC78L05ACP EM 100 083 10 1003 DL RNC55H2102BS MP CT9X503 LG 271A Bright VU Analog Input CE CW 20C473K NC NMC1206Z5U104M50T AV TAP475K025CCS AV TAP105K035HSB MO 1N4734A NT NC3FK H NT NC3MK H PN 051 010 153 PN 050 010 455 CS CS8412 CS MO MC78L05ACP CT 194 2MST SS 67129600 LG 272 Bright VU Digital Input Bright VU Instruction Manual SYMBOL DESCRIPTION LOGITEK PART NUMBER 5 4 LED Display Card C1 C2 P1 J1 D1 11 D12 D13 15 D16 20 D21 31 D32 D33 35 D36 40 IC1 R1 SW1 1 pc 5 5 Power Supply C1 C2 C3 4 RT1 F1 IC1 1 pc P1 J1 J2 SW1 Bright VU Instruction Manual Capacitors 1uf 50V SMD ceramic 10uf 25V tantalum Connectors 10 pin dual row header 10 pin dual row socket Diodes Green LED Yellow LED Orange LED Red LED Green LED Yellow LED Orange LED Red LED Integrated Circuits 64 LED driver Resistors 10K Switches Slide SPDT Circuit card Capacitors 6800uf 35V electrolytic 1uf 50V ceramic 100uf 25V electrolytic Rectifiers 6A pc mount 240V Fuses amp slow blow 20mm Integrated
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