Logitek Software License Agreement
Contents
1. Logitek Software License Agreement The Ultra VU unit you have purchased contains embedded software The software is owned by Logitek Electronic Systems Inc and is pro tected by United States copyright laws and international treaty provi sions Logitek grants to you the right to use one copy of the embedded soft ware in each Ultra VU meter you purchase You may not rent or lease the software You may not reverse engineer decompile disassemble or create 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 state ment All information contained herein is confidential No portions of this man ual may be reproduced by any means with i issi out written Logitek Electronic Systems Inc Pa COPYRIGHT 1996 LOGITEK ELECTRONIC SYSTEMS INC ogitek Electronic Systems Inc 3320 BERING DRIVE x OUT CAN 713 HOUSTON TX 77057 USA x 800 231 5870 OUTSIDE USA amp CANADA 713 782 4592 x FAX 713 782 7597 ULTRA VU NBC896 NBC996 OPERATION 8 SERVICE MANUAL TABLE OF CONTENTS SECTION 1 GENERAL INFORMATION 1 1 General Description 1 2 Electrical Specifications 1 3 Standards 1 4 Instrument Identification 1 5 Where to Find Help SECTION 2 PREPARATION FOR USE Initial Inspection Claims Repacking for Shipment Instal2. 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 carriers 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 Inspect all equipment for damages immedi ately after unpacking Bent and broken parts dents and scratches should be noted If damage is found refer to paragraph 2 2 for recommended claim proce dures Keep all packing material for possible future use 2 2 Claim 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 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 Ultra VU rackmount models are designed to be mounted in a standard 19 equipment rack by us ing the four mounting holes
3. The Logitek E ter featuring two tri col dicators Two function Dt data indicators are also inc 1 2 Electrical Specifications Bargraphs per meter Two Indicators per bargraph 63 Normal Range 70 dB to 0 dB plus clip digital 50 dB to 20 dB plus clip analog 2 dB per segment around ref pt 10 12 14 16 18 or 20 dB Fine Range Reference Point Peak Markers 8 9 10 12 14 16 18 dB above ref pt Ballistics VU Mode 300 mS 20dB attack amp release PPM Mode O mS attack 2 85 24dB release Peak Hold O mS attack 2 or 5 Second hold Max Hold O mS attack pushbutton release Image Phase 4 Sec hold on max image trigger on 1 or 4 consecutive clipped samples Clip Indicator Freguency Response Normal 1 dB 20 Hz 20 KHz Loudness Filter 58 dBSPL auditory curve 40 dB 20 Hz 0 dB 1250 Hz 50 dB 20 KHz Brightness control 8 levels Digital Input Formats AES EBU or S PDIF Impedance 75 Ohm BNC Termination transformer balanced AC Line Input Voltage 50 60 Hz switch settable 105 129 VAC or 220 240 VAC Power Requirement 20 Watts Dimensions 19 Wx 7 Dx 1 3 4 H 1 3 Standards The Ultra VU meters are designed to conform to the ballistic standards described in IEEE document G 2 1 2 13 IEC document 268 and EBU document 3205 E This ensures that the bargraph motion will closely track other standard mechanical and elec tronic meters Page 3 Manual exception to thes Nk ea The Ultra VU
4. information The bottom bar shows ei ther right channel R or mono sum S information The bars are marked at the left end to indicate their function The tri color LEDs can be green red or or ange depending on their function and cover the range from 70 dBFS to 0 dBFS The top LED of each bar is larger and red only Itis used as a clipping indicator and can be set to illumi nate on any clipped signal or only after four consecu tive clipped samples The zero reference point of the meter is indicated by a dim orange marker in the bargraph The refer ence mark can be varied between 18 and 20 dBFS via a switch on the back panel The meter has two stereo inputs Normally the A input is displayed If the B input is being displayed a light next to the B IN legend will light The meters may also have error detection software installed If a problem is detected a light next to the ALARM leg end will light 2 Displ VU is indicated by a solid green bar below 0 VU and a solid red bar above O VU VU represents the perceived loudness of the input signal The motion of the bars conforms to the industry standard 300 mSec per 20 dB rise and fall times Note that the speed of the bar will appear faster near the top of the meter display because each segment there represents fewer dBs than at the bottom of the meter The VU display can be turned off by pressing the MODE but ton atthe bottom left corner ofthe front panel repeat
5. Rel and Max modes by repeatedly pressing the HOLD button at the lower right corner of the meter front panel Filter The VU display can be compensated to match the frequency response of the human ear by enabling the loudness filter This will cause the VU bars to more closely represent the actual loudness perceived by the listener and allow better level matching between different kinds of program material The loudness filteris calibrated fora listening level of 58 dB SPL The filter will be less accurate for listen ing levels above and below this point To activate the filter press the MODE button in the lower left corner of the meter front panel until the Loud indicator is lit Users of the digital input meters should note that filtering is a function of sample rate The meter has a separate filter for each of the five sample rates listed on the front panel If anon listed sample rate is used the loudness filter will be deactivated 3 6 1 S Image Sum Display The image and sum displays are activated by pressing the MODE button in the lower left corner of the meter front panel until the 6 indicator if lit in this mode the lower bargraph displays the mono sum of the left and right input channels The display operates identically to the left and right bar graphs except that the loudness filter is not available The upper bargraph shows the stereo image and relative phase information Three orange marker
6. a 5VDC regulator that feeds the digital portion of IC1 and IC2 and all other circuits on the control board The output voltage is filtered by C10 and clamped by D3 Distributed power filtering is supplied by C11 14 On power up the DSP is kept in reset by 1C6 until the power has stabilized ensuring a good power on reset IC6 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 the left bargraph load signal The DSP IC8 is clocked by a 12 288 MHz crystal oscillator consisting of Y1 C15 C16 and an internal Ultra VU NBC896 amp NBC996 Operation amp Service Manual Page 8 Nae 1C8 pin 43 is a buffered output of the oscilla or The first thing the DSP IC8 does after reset is copy its program from EPROM IC7 to internal RAM memory That program executes continuously Note that the 8 bit data bus is connected to the middle byte of the DSP s 24 bit data port The rear panel DIP switch S1 8 and the front panel rocker switches S11 and S12 are connected to the DSP data port via pull up resistors R1 R2 and isola tion resistors R10 R11 Serial data is sent synchronously data clock load to the display driver chips via the left right dis play connector P7 and image sum display connector 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 w
7. edly until the VU bars disappear E ispl Peak program meter PPM information is shown by asingle red segment PPM represents the highest point of the input signal The display has a zero rise time and an industry standard 2 8 Sec per 24 dB fall time The dot will appear to fall faster near the top of the meter range because each segment there repre sents fewer dBs than at the bottom of the meter The PPM display is always active unless it is turned off by the programming switches on the back panel The VU and PPM displays are calibrated so that they will read the same when connected to sine wave signals The red PPM dot will be on top of the highest green segment of the VU bar resulting in a bright or ange dot For dynamic signals the difference be tween the top of the VU bar the the PPM dot is approximately the crest factor 3 4 Peak Hold Display The peak hold display is a single red segment that maintains the highest PPM reading for a user se lectable amount of time If the holding period expires before the PPM dot equals or exceeds the peak hold dot then the peak hold dot will turn off It wiil turn on again when the PPM dot reaches a peak and starts falling again Two holding modes are available Release Rel mode holds the peak reading for 2 seconds Maxi mum Max mode holds the highest peak reading un til it is manually reset by turning the peak hold off and then on again Peak hold can be cycled through Off
8. the alignment plate Ifa LED needs re placing pry it out of its socket with a screwdriver and remove it Remember to consult the component dia gram for the correct orientation before installing a new LED Also note that the tri color LEDs are graded according to color and brightness A sticker on the back of the PCB denotes the correct lot number needed for reordering Ultra VU NBC896 amp NBC996 Operation amp Service SECTION 5 REPLACEMENT PARTS LIST All replacement parts are stocked in depth 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 pants 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 BESYMBOL DESCRIPTION LOGITEK PART NUM 1 Pow ly LG Capacitors C1 6800 uf 25V electrolytic IL 688LBA025M2CD C2 1uf 5OV ceramic disc NC 100MF50ME2 C3 4 100uf 25V electrolytic NI UFS1E101MPJ Integrated Circuits 161 Charge pump TI LT1054CN 1 pc 8 pin dip socket EM 100 083 10 1003 Rectifiers RT1 6A pc mount 240V GI GBPC 602 Fuses F1 1 2 amp slow blow 20mm LF 218 500 Connectors P1 3 pin large header locking PN MLSS1
9. 1 Ultra VU NBC896 amp NBC996 Operation Service Manual Page 4 Overmod Alarm Trip Point Sw1 Sw2 dBs below full scale AA Up Up 17 dB 43 dB above 20 dBFS Up Dn 14 dB 6 dB above 20 dBFS Dn Up _ 11 dB 9 dB above 20 dBFS Dn Dn__ 8 dB 12 dB above 20 dBFS Overmod Alarm Delay Sw3 Sw4 delay before alarm activates Up Up _ 30 seconds Up Dn 60 seconds Dn Up 120 seconds Dn Dn_ 180 seconds An alarm will be activated when the average signal level of either channel remains under the undermod setpoint for the entire alarm delay period The trip point and delay time is set via the programming switches and the alarm ts output on relay 2 U n Trip Poi Sw5 Sw6 dBs below full scale Up Up 35 dB 15 below 20 dBFS Up Dn 40 dB 20 below 20 dBFS Dn Up 1 50 dB 30 below 20 dBFS Dn Dn 60 dB 40 below 20 dBFS Undermod amp Phase Alarm Delay Sw7 delay before alarm activates __ Up 1120 Seconds Dn 240 Seconds The programming switches are only checked oc casionally so it may take up to two seconds for switch changes to be reflected in the meter s opera tion Page 5 Manual Ultra VU NBC896 NBC996 Operation amp Service SECTION 3 OPERATING INSTRUCTIONS 3 1 Bargraph Description The Ultra VU display contains two multi LED bar graph displays mounted one above the other The top bar shows either left channel L or im age phase
10. 3A I Oe 3 pin large socket PN CE156F20 3A 1 pc 3 pin socket PN CE100F28 3A 2 pcs 10 pin dual row socket PN 050 010 455 1 pc 2 circuit jumper EM 282 11 20 Crystal Y1 12 288 000 Hz crystal CT MP122 Ferrites FR1 4 bead 600 Ohm 100 MHz MU BLM31A601SPT Relays RLY1 3 Dry reed SPST 5 volt CP DSS41A05 Resistors Biz 100K 2 5 position bussed CT 770 61 R104 R3 4 100K R7 8 75 R9 10 1000 R11 12 20K 8 pos isolated DL SOMC1603203G R13 17 10K Switches S 1 8 Dip switch block CT 194 8MST Transformers 11 2 AES EBU SS 67129600 1 pc Circuit card LG 257a Digital Control Alarm 5 3 Display Assembly LG 267 Capacitors C1 10uf 25V tantalum AV TAP106K025HSB CAS 1 uf 50V Z5U SMT 1206 NC NMC1206Z5U104M50T C4 100uf 20V tantalum AV TAP107K020CCS C5 10uf 25V tantalum AV TAP106K025HSB Page 11 Ultra VU NBC896 8 NBC996 Operation amp Service Manual LOGITEK PART NUMBER NC SY VBRG5641X order by brightness number on display card QT MV57124A SY VBRG5641X order by brightness number on display card SYMBOL DESCRIPTION C6 8 1 uf 50V Z5U SMT 1206 NMC1206Z5U104M50T Diodes D1 62 Tricolor LED bar 2mm x 5mm D63 Red LED bar 3mm x 6mm D64 125 Tricolor LED bar 2mm x 5mm D126 Red LED bar 3mm x 6mm D127 141 Yellow LED bar 3mm x 6mm Integrated Circuits IC1 5 64 LED driver IC6 5VDC regulator 1 5A Connectors P1 10 pin dual row header Pesa 3 pin header J1 10 pin dual row socket J2 3 3 pin socket Res
11. 56 3A J1 3 pin large socket PN CE156F20 3A J2 Power entry module fuse holder SR 6200 4115 Switches S1 Slide DPDT CK L202 121MS02QE Transformers T1 8V 3A international rating SI IF 24 16 1 pe Super VU Supply circuit card LG 253C i pc Power card North America BE 17251 5 2 Dual Digital Alarm Card LG 257a Capacitors C1 2 1uf 50V ceramic CE UK50 104 C3 4 047uf 1000V ceramic CE CW 20C473K C5 8 1uf 50V ceramic CE UK50 104 C9 11 10uf 25V tantalum AV TAP106K025HSB C12 14 1uf 50V ceramic CE UK50 104 C15 25pf 1000V ceramic CE DD 250 C16 15pf 1000V ceramic CE DD 150 Diodes D1 3 small signal GI 1N4148 D4 5 5 4V zener Gl 1N4734A Integrated Circuits Ultra VU NBC896 amp NBC996 Operation amp Service Manual Page 10 SYMBOL DESCRIPTION LOGITEK PART NUMBER 101 2 AES EBU receiver CS CS8412 C5 IC3 5VDC regulator 100 mA MO MC78LO5ACP 104 5VDC regulator 1 5A MO MC7805CT ICS Quad D flip flop MO MM74HC173D IC6 Watchdog timer uP reset MM MAX1232CPA IC7 EPROM 16Kx8 120ns MC 27C128 12 L IC8 DSP 16 bit 1K 2 ser ports AD ADSP 2115KP55 IC9 3 to 8 decoder MO MM74HCT138D 1 pc 8 pin dip socket EM 100 083 10 1003 1 pe 32 pin PLCC socket EM 150 032 11 02 1 pe 68 pin PLCC socket EM 150 068 11 02 Connectors eee BNC PC mount AP 31 71043 1010 P3 10 pin dual row socket PN 050 010 455 P4 3 pin header PN MFSS100 3A ES 3 pin large header PN MFSS156 3A LONA 10 pin dual row socket PN 050 010 455 P8 3 pin header PN MFSS100
12. d via P2 C4 provides bulk power storage while C1 C2 C3 and C5 through C8 stabilize the 5 volt supply Each display driver IC controls 64 LEDs by scan ning them in an eight by eight matrix Segment lines are current controlled and connect to the LED an odes Digit lines connect to the LED cathodes Scan ning is accomplished by taking each digit line low one ata time and sourcing current from the segment lines for whichever of the 8 LEDs in a digit group need to be Rage 9 Manual lit The driver chips can also selectively decode BCD data into 7 segment numeric display signals Maxi mum LED brightness is set by the external resistors The drivers further control brightness by pulse width modulating the LED on times with a value supplied by the DSP The display drivers accept synchronous serial data clock data load in 16 bit strings composed of an address byte and a data byte The driver ICs are arranged in two chip groups The data out of one chip is hooked to the data in of the second chip such that 4 bytes can be loaded two to each chip with one load pulse IC1 and IC2 drive the upper bargraph left chan nel IC3 and IC4 drive the lower bargraph right channel IC5 drives the scale indicator LEDs along the bottom edge of the display Avoid removing all three LED alignment plates if at all possible There is very little space around the indi cator LEDs and if any get bent itcan take some time to reassemble
13. ill notice that the meter is working incorrectly and restart the system The processor can be reset manually by turning the power off and then back on again Ultra VU NBC896 amp NBC996 Operation amp Service SECTION 4 MAINTENANCE 4 1 General Information The Ultra 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 guestion 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 FEA x amp x amp x 4s WARNING 5 ix The inside of the Ultra 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 KC XARXA AR The primary winding of the power transformer is fused with a 1 2 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 re placed with fuses of the same type and current rating The power cord must be unplugged from the rear panel to gain access to the fuse holder SERE NAN PN IN aa EE E Do NOT replace the fuse without first disconnect ing the meter s power c
14. inthe corners of the front panel Plastic washers should be used to keep the mounting screw for marring the front panel finish 2 5 Connecting Mains Power Connect the meter to the power mains with the en closed power cord The unit is factory set for 115VAC operation unless specifically labeled otherwise but 230VAC operation can be selected via a slide switch located next to the power transformer inside the unit To gain access to the voltage select switch remove the enclosure top cover The switch is located adja cent to the large power transformer 2 6 Connecting Audio Inputs The Ultra VU accepts two inputs per meter via 75 ohm female BNC connectors on the rear panel The input format is AES EBU or S PDIF serial data at sample rates of 30 000 to 50 000 samples per sec ond Normally the A input is displayed on the meter and checked for errors by the alarm section To check and display the B input connect the switch 1 terminal to the switch common terminal on the rear panel ter minal block Note that the switch inputs are surge protected but not ground isolated and should be kept within 5 volts of the enclosure 2 7 Alarm System UV2 RD NBC896 only Three elements of the active input are constantly checked for errors A dry contact relay closure is acti vated if an overmodulation undermodulation or phase reversal problem is detected The relay con tacts are accessed via a rear panel terminal block Also a front pane
15. istors R1 5 5100 Switches Sie pushbutton 6 pcs 64 pin SIP press in socket 770 ae Display circuit card 3 pcs LED locator plates Ultra VU NBC896 amp NBC996 Operation amp Service Manual Page 12 QT MV57124A QT MV53124A MM MAX7219CWG MO MC7805CT PN 051 010 153 PN MFSS100 3A PN 050 010 455 PN CE100F28 3A NK AB11AP FA PR 304 13 164 41 LG 267 LG 268 SECTION 6 MANUFACTURERS LIST Page 13 Manual MANUFACTURER LOCATION Analog Devices Amphenol RF Microwave AVX Stantel Corp Belden Centralab Electronics Div CP Clare Corp C amp K Components Crystal Semiconductor Gis Dale Electronics Inc Ecam Technology General Instruments Quality Technologies Illinois Capacitor Littlefuse Logitek Circuit Cards Microchip Technology Inc Maxim Motorola Semiconductor Products Mepcopal MORS Components Inc Murata Electronics NA Inc NIC Components Corp Nichicon Neutrik Mill Max Mfg Preci dip Panduit Corp Signal Transformer Schurter Inc Schott Corp Stanley Ultra VU NBC896 8 NBC996 Operation amp Service O xn na Norwood MA Danbury CT Myrtle Beach SC Richmond IN Milwaukee W Chicage IL Newton MA Austin TX Elkhart IN El Paso TX Scottsdale AZ Sunnyvale CA Lincolnwood IL Des Plaines IL Houston TX Chandler AZ Sunnyvale CA Phoenix AZ San Diego CA Wakefield MA Smyma GA North Amityville NY Schaumburg IL Lakewood NJ Oy
16. l indicator will light if any alarm is active Trip points for over and under modulation are pro vided as well as variable delay times before an alarm is activated The phase display triggers if the left to right phase relationship is more than 2 3 out of phase and is not adjustable Normally an alarm will reset as soon as the error causing it stops However the alarms will latch on and not reset if jumper P8 is removed P8 is located on the control card nerar the center It is accessed by removing the meter top cover When in latching mode is active an alarm will remain active until the switch 2 input on the rear panel terminal block is con nected to the switch common pin 2 8 Rear Panel Programming Switches A block of eight mode setting switches is located on the rear panel of the meter to the right of the input BNC connectors The switches are numbered 1 through 8 and are set by pushing the white levers up or down with a small screwdriver or pen point The orange bargraph zero reference marker and the reference level of the fine display is set via switch 8 as shown Zero Reference Setting Sw8 dBs below full scale _ Up 18 dB dl IDn 20 dB An alarm will be activated when the average signal level of either channel exceeds the overmod trip point at least once every 5 mSec during the entire alarm delay period The trip point and delay time is set via the programming switches and the alarm is output on relay
17. lation Connecting Mains Power Connecting Audio Inputs ONOORWwONM 2 2 2 2 2 2 2 2 Rear Panel Programming Switches 5 n 3 OPERATING INSTRUCTIONS 3 VU 3 PPM Dis 3 3 3 3 3 3 3 3 SECTION 4 MAINTENANCE 4 4 4 4 4 4 6 Dual Digita as SECTION 5 REPLACEMENT PARTS LIST Sal e SU ME A A se aneorsaoade ape 5 2 Dual Digital Alarm Card LG 257aA a a S28 Disaley Acscmibly EAT A e wom aos oe woo og oder e SECTION 6 MANUFACTURERS LIST SECTION 7 DIAGRAMS p Alarm System UV2 RD NBC896 only A A Oo O oOo Pesan DESTINO AS UR ES Na oh Bplay bo Ege Oot Pes com GEE Eat re mes GOS ne o OT Y a a a Pen an ls uce ops tec a as Sas a ana ee we DB RESTO Ds A EA A LS A OSTRAS LOUD i 1 2 3 4 5 ype a hg A A eer NE IESO ON DE A oe 3 AU Da DAYA Gout reac tn NUN Tan 9 Gending Display danes ooo coca aeons ea NOME I RainciGate rset PON AA TA NResetii ng SOTANO A RARA EI I Generalntormallo cas a a das AS DM ES A A et EEN Me Pt E ETS 3 Handling of CMOS Integrated Circuits o ooo o A ACCESO Gir cun dara 95 A IA ene 5 Power eg IGE 56 norte ARTO LO STRAIT 6 PNlarink arcte ll Gersy a PI NK ADS AS Sam DIV CE OW a eet egy wes AN S SECTION 1 GENERAL INFORMA TION e standards is the PPM J _ General Description Ultra VU isa bargraph type audio me or LED bargraphs with clip in buttons and several auxiliary luded on the front panel
18. only EMPH indicates pre emphasis has been applied to the audio and is recovered from the embedded channel status data The circle is lit only when em phasis is detected The indicator is accurate with both AES EBU and S PDIF input formats PRO indicates whether the data stream is in the professional or consumer format and is recovered from the embedded channel status data The circle is lit only when the AES EBU professional format is de tected 3 9 Changing Display Brightness The overall illumination level of the meter can be set to one of eight levels To change the brightness level press the MODE button until the BRT indicator lights Then press the HOLD button until the desired illumination level is achieved 3 10 CLIP indicator set point The large red clip segment at the top of each bar graph can be setto light on the reception of either one or four clipped samples in a row To change the set ting press the MODE button until the CLIP indicator along the bottom of the meter lights Asegmentin the lower bargraph will start to blink alternately red and green to indicate the current setting Press the HOLD button until the desired setting is shown on the bar graph 3 11 Resetting the Program The Ultra VU contains software that executes ona programmable DSP chip If the processor memory Page 7 Manual becomes corrupted the meter will probably fail to operate In most cases an independent watchdog circuit w
19. ord from the wall socket as dangerous voltages are present which may cause electrical 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 shock hazard and fire hazard may result EEE TEE E ES 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 CMOS Integrated Circuits All logic components in the Ultra 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 tee kK EX IMPORTANT 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 controllers Do NOT store on styrofoam or other plastic sheets Improper handling may damage these devices RK K RK KR KEKE KEK KKK KEKE EK KKK KEK KEE KE 4 4 Access to Circuit Cards Access to the circuitry of the rackmount meters is accomplished by removing the eight screws that at tach the top cover 4 5 Power Supply LG 253 Each Ultra VU contains a ground isolated and fil tered step down power supply to create the neces sary operating voltages Thi
20. rite to address decoder IC9 Other writes to IC9 will load the 16 bit data string into one of the display drivers on the display board A write to the left bar graph will also be decoded by IC9 and used to reset the watchdog timer Two channel audio data is fed synchronously data clock frame sync from data receiver IC1 to DSP 108 serial port 1 Encoded audio data enters the meter via BNC connector J1 passes through ferrite beads FR1 FR2 and connects to pulse transformer T1 via DC block ing capacitor C1 The output of T1 is loaded by R5 R3 and connected to data receiver IC1 C3 and R7 form a loop filter used by IC1 to recover the embedded clock from the coded input signal IC1 separates the audio data channel data and clock from the input data The audio is sent to the DSP in 64 bit strings via a serial port Channel subcode data and the PLL lock flag are connected to the DSP data bus via isolation resistors R11 The second inputis handled in an identical fashion by IC2 and is connected to serial port 0 of the DSP Four bits ofthe data bus are stored in quad flip flop IC 5 by a write to address decoder ICQ The outputs of IC5 drive up to three SPST relays The relay switch contacts are sent to the rear panel alarm connector via P3 4 7 Display Assembly LG 267 Filtered power is connected to the driver card via P1 5VDC regulator IC6 is bolted to the meter enclo sure to increase heat dissipation and connects to the driver car
21. s are located at 90 degrees left O degrees center and 90 degrees right The scale covers 180 degrees which is the largest relative phase difference two sig nal can have The red dot indicates the current location of the left channel in the stereo sound field and the green dot in dicates the current location of the right channel in the Ultra VU NBC896 amp NBC996 Operation amp Service Manual Page 6 stereo sound field The overall width and location of the stereo image is shown by a second pair of red and green segments that hold the furthest left and right readings for about four seconds If a mono signal is being displayed then the red and green segments will be at the same location re sulting in a dot that looks orange If the mono signal is off center such as left channel only the resulting orange dot will be off to one side of the display 3 7 FINE High Resolution Mode Fine is a high resolution mode that expands the meter scale to 2 dB per segment around the 0 VU point This mode is useful when doing precise align ments using steady state signals Fine is activated by pressing the MODE button at the bottom left of the meter front panel until the FINE indicator lights 3 8 Auxiliary Date Display Ultra VU models with serial digital inputs provide information about the input data format via indicator lights along the bottom of the meter front panel This information is for the active channel
22. s 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 cordin 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 230VAC 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 to the red and green output pads The voltage should be between 8 to 10 VDC with less than 5 volt of ripple Analog input models will also have a charge pump consisting of C1 and C3 that feeds filter C4 and the black output pads The voltage should be 8 to 10 VDC with less than 1 volt of ripple Jumpers soldered to the output pads feed power to one or two meter control cards o NN ena ana Dangerous voltages are present on the bottom of the power supply card Always disconnect the AC power cord when servicing this circuit board a EEE EE Kk 4 6 Dual Digital Alarm Card LG 257a Power from input connector P5 is connected to voltage regulators IC3 and IC4 as well as display board connectors P6 and P7 IC3 is a 5VDC regula tor that feeds power to the analog front end of data re ceivers IC1 and IC2 The voltage is filtered by C5 C9 and clamped against over voltage and voltage rever sal by D2 IC4 is
23. ster Bay NY Tinsley Park IL Inwood NY Petaluma CA Minneapolis MN Battle Creek MI
24. uses a ne E ok Tt scheme that always displays the nig i tandard specifies a input signal The PPM s Na io period for peak signals He aa sounds with durations too short to be hear ie being displayed no matter how loud they are allows mechanical meters to keep up with se area ns inputs Under most OR ee there is no noticeable difference between true pea and PPM peak readings However if you do need the Ultra VU to conform to the PPM peak standard then please contact the Logitek factory for further informa tion 1 4 Instrument Identification The Ultra 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 5 Where to Find Help Logitek customer service personnel are available to help with any questions comments or problems you might have with the Ultra VU meter both during and after the warranty period Our hours of operation are 8AM to 5PM central time We may be contactedin one of the following ways By Phone 800 231 5870 USA Canada or 713 782 4592 By Fax 713 782 7597 By Email help Ologitekaudio com By Mail Logitek Electronic Systems Inc 3320 Bering Drive Houston Texas 77057 USA Ultra VU NBC896 amp NBC996 Operation amp Service aan an aaa m
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