Digilyzer DL1 User Manual
Contents
1. ee ds tir AUTO LIGHT OFF 3 SEC ress o leave PPH OER THRESH 3 SHFLS SETUP Screen HULTIFLE SETUF DISRELE FRESS ESC SETUP 9 Backlight power off Fig 3 06 Auto power off setting Press the On Off key shortly to energize the backlight The backlight remains active according to the setting in the SETUP menu Press the On Off key for two seconds to switch the instrument off Congratulations the first steps have been done with the Digilyzer to support the basic knowledge of the menu and device handling NOTE Pressing the enter key changes a value directly or enters the selection mode blinking cursor The available settings may be selected with the cursor keys Inthe selection mode you may press ENTER to confirm the setting ESC key to undo the setting Basic Operation 4 BASIC OPERATION The operation of the Digilyzer is almost self explanatory despite the wide range of available measurement functions Speaker at the rear side RAMMEL 2 SOPPH wHLER h ID Escape button Power On Off Backlight Enter Cursor keys Fig 4 01 Control elements The LCD is divided into the menu bar on top and the results displayed below showing various information about the current status To quickly get the required information press the enter cursor keys and the escape button to allow straightforward navigation through the available featu2. LEWEL ADAT Arrow mode Zoom Y Scale Arrow readout Fig 5 43 Frequency sweep graph Within a graph every recorded sample is connected by a straight line approximately to the previous next sample thus building the displayed curve In practice the following steps are required available for the execution of a frequency sweep Arm the sweep recording process by moving the cursor to the REC field and pressing the enter key The DL1 detects the start tone 315 Hz or 1 kHz of an external sweep and the recording is automatically started This status is indicated by the flashing REC field Alternatively the sweep recording may be started manually by pressing the enter key with the cursor on the ARM field Consequently the DL1 records every incoming signal with a higher frequency than the previous sample 44 Measurement Functions The sweep recording will be stopped when as soon as an input signal with a lower frequency occurs or manually by the enter key pressed again cursor on the flashing REC field In order to analyze the sampled curve more detailed activate the arrow mode by placing the cursor to the corresponding symbol Press the enter key and move the arrow to the sample s of interest by using the left right keys To zoom in out the Y axis move the cursor to the zoom mode field press enter and use the left right keys scroll through the Y axis move the cursor to the zoom mode fie
3. 57 Appendix Byte Bit Bit info Digilyzer Explanation Channel status Quick view 1 0 3 1011 CH MOD RES Reserved 1100 MOD RES Reserved 1101 MOD RES Reserved 1110 MOD RES Reserved 1111 see byte 3 4 7 Userbits management 0000 UDAT NO ID No user information 0001 UDAT 192 B 192 bit block structure 0010 UDAT AES18 AES18 standard 0011 UDAT USRDF User defined 0100 UDAT 60958 Conforms to IEC others UDAT RSRVD Reserved 2 0 2 Use of auxiliary sample bits 000 AUX NO DEF Use not defined 001 AUX 24BIT Use for main audio 010 AUX TLKBCK Use for talkback 011 AUX USRDEF User defined others AUX RESRVD Reserved 3 5 Audio sample word length 000 WLEN NO ID applicable if byte 2 001 WLEN 23 23BIT bit 0 2 is 1005 010 WLEN 22BIT 22BIT 011 WLEN 21BIT 21BIT 100 WLEN 20BIT 20BIT 101 WLEN 24 24BIT 110 WLEN RSRVD Reserved 111 RSRVD Reserved 000 WLEN NO ID applicable in all 001 WLEN 19BIT 19 other cases 010 WLEN 18BIT 18 011 WLEN 17 17 100 WLEN 16 16 101 WLEN 20BIT 20BIT 110 RSRVD Reserved 111 WLEN RSRVD Reserved 6 7 Indication of alignment level 00 ALGN NO ID Not indicated 01 ALGN SMPTE Acc to SMPTE RP155 10 ALGN EBU According to EBU R68 11 ALGN RSRVD Reserved 58 Appendix Byte Bit Bit info Digilyzer Explanation Channel status Quick view 3 0 2 Channel
4. To double the frame rate from the previous 48 kHz to 96 kHz not possible for older equipment This is the normal operation of the Digilyzer Using the two sub frames two channels of a 48 kHz frame rate AES3 signal to carry consecutive samples of a mono signal resulting in a 96 kHz sample rate stream The samples of one 96 kHz signal are packed interleaved into two 48 kHz signals This allows older equipment which transmitters and receivers are not rated for 96 kHz frame rate operation to handle 96 kHz sample rate information This mode is called single channel double frequency mode or double wire mode two AESS cables are needed for stereo The Digilyzer also enables measurements in this mode Just select the input format 1C2f and the input channel menu will indicate A i B or eg 1 i 2 for ADAT This indicates that channel A and B are used in an interleaved manner 1C2f mode A and B are interleaved STAT 47999 78 Foy TUS L erp E 4 3 Unn C ern ea ae BLINEAR ren BLOCK ID ha ID mFA uH kHz s AU ste x 1 000 Fig 8 01 1C2f selection The Digilyzer is specified for samples rates up to 96 kHz so for a 1C2f signal the resulting sample frequency shall not exceed this value 52 NOTE Appendix The second channel e g B is invalid in the 1C2f mode This is indicated in the measurement functions like LEVEL P
5. 1 000 Fig 5 06 Channel status consistency check The consistency check is carried out with the following parameters Sample frequency Word length Clock accuracy 1C2fusage Application hints Wrong signalization of the sample frequency of digital audio devices may cause real trouble Some units expected to be e g 24 bit devices signalize 24 bit in the channel status but only send 22 relevant bits The consistency check helps to see this problems quick and easy Channel Status Details Detailed information about the interpretation of each individual bit and bytes may be found in the normative documents IEC 60958 3 and AES3 A summary is given in the appendix 30 Measurement Functions Channel Status Comparison Both channels of an AES3 or S PDIF signal have their individual channel status information In 99 of all applications the content is identical In case of any difference the small square indicators in front of each label would turn into triangles and constantly toggle Channel A selected CH STAT S F 41999 18 Hz H 4 5 EI 570 wFR FESSIDHL EHPHHS 11 S STEREO BLOCK hg ID sUDAT ID Different status gt AUR information of 1 000 gHEIT channel A and B Fig 5 07 Channel status comparison Channel Status Memory The current channel status information may be stored a
6. CHANNEL 7 Channel number SOFFH fio ID Word length Fig 5 04 Channel status consumer page 1 Page number CH STAT TOSL CH APSET HEH 43998 23 Hz Em IL EH B ncc em Category code Ap CH AUDIO SIGNAL COHFATIELE GEM ORIGINAL HRTERIRL Copy protection m COPYRIGHT 15 ASSERTED Original fs B ORIGHAL FS Hn ID Fig 5 05 Channel status consumer page 2 On page two are the fairly complex category tables providing simple device statements such as e g LASER OPTICAL PROD or MINI DISC SYSTEM interpreted into words and letters for easy read out The original sampling frequency field is used to indicate the fs of the signal prior sampling frequency conversion in a consumer playback format Page three displays the complete status information as hex code 29 Measurement Functions Consistency Check The consistency check is constantly running as a background task It compares the carrier information with the status information E g the sampling frequency claims to be 44 1 kHz but in reality is 48 0 kHz Such errors are immediately displayed via a flashing square around the individual status information Measured EH STAT S F D CHAISE T sampling HUT 999 78 frequency 4 5 pp 3 Fy a REL STH 5 sni BLINEAR FCH S STEREO CHM Wrong sample 06 hg fie ID frequ status s AU gHEIT information mF5
7. Cyclic Time of day redundancy Sample code check Data origin destination Fig 5 02 Channel status professional page 2 Further details to the individual status indications are listed in the appendix 27 Measurement Functions Page number CH STAT SA RO CH 41999 18 Hz Em 4 5 linn eru Column number Row number 000 00 0000 00 00 000 00 00 00 00 Fig 5 03 Channel status professional page 3 On the third page the complete status information is displayed as hex code The content of each status byte is shown as two digits in hex code The status information contains 24 bytes These are displayed within three rows and eight columns The individual row and column numbers shall be added together to read the information containing in the corresponding byte number e g row number column number byte number 0 4 4 8 6 14 10 hex 2 18 Application hint There are many undefined and reserved bit combinations in the channels status The HEX view offers the possibility to further examine the reserved states if necessary 28 Measurement Functions Consumer Format Status Page number memory cH SET n 41999 18 Hz Em B J en Format se m CONSUMER m 2 HANNEL Channel mode Data coding hu EHFHAS signal emphasis Sampling frequ sp FS 48 0kH2 S0URCE o Source number Clock accuracy BACK LULL BS
8. as A D converters or digital mixers is available in combination with the analog signal generator Minirator MR1 11 Overview Connectors The Digilyzer includes the following connectors AES3 110 Ohm S PDIF 75 Ohm Headphone TOS Link terminated terminated output ADAT Fig 2 09 Inputs and outputs of DL1 NOTES ForAES3 75 Ohm signals BNC connector use the attached Chinch BNC adapter Insert a jack into the headphone output to switch of the analog monitoring with the internal speaker e g during a live act Rubber Cushions The original packaging of the Digilyzer includes a pair of rubber cushions These may be adhered on the rear side of the device so the output signal is made audible in good quality also whilst the Digilyzer lays e g on a table with the speaker on the bottom side Chinch BNC Adapter The Chinch BNC Adapter enables the measurement of the AES3id 75 Ohm standard with the Digilyzer AES3id is especially required for the transmission of digital signals over longer cables with a cable length gt 100 m 12 Overview Battery Replacement Insert three pieces of 1 5 V alkaline batteries type AA LR6 AM3 into the Digilyzer battery compartment as shown below Rubber cushion Speaker 1 Press 1 Press gt Pull Fig 2 10 Open battery compartment Fig 2 11 Inserted batteries NOTE The use of rechargeable NiCd or NiMH batteries causes shorter battery lifetim
9. cheap equipment e g a TDIF to ADAT converter Overview Functions The Digilyzer features many useful measurement functions which are accessible through a menu bar SF OCH let amp n RCL_STO IRL shu 5 CH STEREO CHM Dn rs an ukHz eFS x 1 000 gHEIT Fig 2 02 Measurement functions Easy operation The Digilyzer has an easy to use menu driven user interface Changing of the settings takes place at the displayed values there is no complex setup screen The base element for operational functions is the cursor inverted area which can be navigated through the various screens by using the cursor keys All selectable settings may be adjusted individually by pressing the enter key and selecting the requested value with the cursor keys Confirm the setting by pressing the enter key again ES RCL ern EMFHAS Dn ID rz an ukHz SAU SES 1 000 Fig 2 03 DL1 menu Overview LEVEL TETE G 999 18 Et 4 3 Upp C 8 0 change setting FRO 2 STREG Fig 2 04 Changing settings Monitoring When it comes to digital audio one of the major problems is that humans do not have digital ears and thus can not listen to the incoming embedded audio signal The Digilyzer offers a wide range of functionality to make digital audio audible What you
10. hear is what you measure Functions with measurement of both channels e g A B the output of the speaker is a mix of the two channel signals Over the headphone output you may hear the signal in stereo channel Aon the left and channel B on the right side Both channels A B selected 41999 18 Hz Em 4 5 pp Co 16 1 4 15 14 FRO 2 STREG Fig 2 05 Channels A B selected Overview Some functions e g SCOPE are one channel functions only You only hear the channel which is displayed on the screen Channel B selected CH STAT AED 41999 78 Hz 25 4 3 Upp Cod STO efi EHFH s wLInERRE FCH STEREO CHM BLOCK fi ID fie ID SAU mFS 1 000 Fig 2 06 Channel B selected Digital versus analog Installations with digital and analog audio lines often cause headache and struggles In reality some analog line maybe connected and the Digilyzer can not lock to the non digital signal Therefore the Digilyzer has the ability of analog monitoring The Digilyzer may not lock to the input signal digitally but it routes the signal directly to the speaker and headphone output so you may hear the analog input signal acoustically For visual clarification ANALOG MONITORING ON is flashing on the display CH STAT SPD EE EI 4 3 eru fa CARRIER of SELECTED INFUT ANALG Ho
11. identification 000 CH MCMDO Mode 0 001 MCMD CH Reserved 010 MCMD2 CH MCMD2 Mode 2 011 MCMD CH Reserved 100 MCMD1 CH MCMD1 Mode 101 MCMD CH Reserved 110 MCMD3 CH MCMD3 Mode 3 111 MCUSR CH MCUSR User defined 4 0 1 Digital audio reference signal 00 NO REF SIG No reference signal 01 GRAD 1 REF Grade 1 ref signal 10 GRAD 2 REF Grade 2 ref signal 11 REFS RSRVD Reserved 3 6 Extended sampling frequency 0000 FS NO ID FS NOID Not indicated 0001 FS RESERVD FS_RSVD Reserved 0010 FS RESERVD FS RSVD Reserved 0011 FS RESERVD RSVD Reserved 0100 5 96 2 96 0kHz 0101 s 88 2kHz 88 2kHz 0110 FS RESERVD FS_RSVD Reserved 0111 FS RESERVD FS RSVD Reserved 1000 5 24 2 24 0 2 1001 8 22050 2 22050Hz 1010 FS RESERVD FS RSVD Reserved 1011 FS RESERVD FS_RSVD Reserved 1100 s 192kHz 192kHz 1001 s 176400 176kHz 1110 FS RESERVD FS RSVD Reserved 1111 FS USERDEF FS USER User defined 7 Sampling frequency scaling flag 0 FS 1 000 No scaling 1 FS 1 001 Scaling 1 1 001 59 Appendix Consumer Format Coding Overview of codings and abbrevations used for the consumer channel status display MSB left Byte Bit Bit info Digilyzer Explanation Channel status Quick view 0 0 Use of channel status 0 CONSUMER CON Consumer format 1 PROFESSNAL PRO Professional format 1 Data coding 0 LINEAR PCM Linear PCM samples 1 NO LIN PCM No lin PCM samples 2 Copyright 0 COPYRIGHT ASSERTED 1 NO COPYRIGHT ASSERT
12. signal level compared to the full scale of the converter The result is displayed simultaneously for both channels in numerical letters and in analog form indicated in a bargraph 1313 5 47999 18 Hz E 4 5 pp Co LBL ABE OSS and unit per H 1 1 B indication 2 STREG gHEIT Fig 5 41 Level peak screen Result and unit The peak level can be displayed in three different units dBF decibel full scale percent of full scale x1 number e g 0 1 of full scale The peak level units refer to the maximum possible level of the digital signal 100 or 0 dBF Application hint To measure the peak level during a period of time use the VU PPM function and monitor the numerical peak hold values 41 Measurement Functions Level RMS The analog Level RMS function measures the RMS level of the digital input signal Since the Digilyzer has no information about the reference voltage such as the value to digitize the analog signal value to convert the digital signal into the analog domain The RMS values are displayed as relative numbers compared to a sine wave signal with 0 dBF peak value 1313 NP ES 3 cH 41999 78 Hz Ems Result and unit 16 idBr 1 122 Filter Display mode Audio frequency Fig 5 42 Level RMS Result and unit The RMS level of the individual selected channel can
13. the converter must round each sample value which results in an error called quantization noise A perfect test signal fed into an ideal A D converter causes a THD N of the digitized signal of theoretically N 6 02 dB 1 76 dB bit resolution of the converter E g a 16 bit converter has a theoretical THD N of 98 08 dB In practice good converters even 24 bit do not achieve better values than 110 dB With such measurements the input signal is often the limiting point To measure THD N down to 100 dB a generated sine wave with a THD N better than 100 dB is required Such a sine wave is often generated only by expensive special audio analyzing equipment 47 Measurement Functions Scope The scope shows the waveform of the input signal It measures the dominating fundamental frequency momentary peak level and adjusts the X and Y axis scaling automatically Y Axis scale Actual level peak 050 5HFL 5 DIU f X Axis scale Fundamental frequency Fig 5 60 Scope screen Y Axis scale Automatic scaling from 25 div to 0 1 ppm div allowing to see the LSB of a 24 bit signal Actual level peak Since it is sometimes difficult to get a feeling for values of e g 0 6 ppm the actual peak level of the data shown on the screen is displayed in dBF X Axis scale Automatic scaling from 1 to 500 samples per division Pause The scope display may be paused by selecting this field with th
14. unit Hz Press the enter key to select Press any cursor key to change from Hz to ppm The measured accuracy is immediately displayed Press the enter key to confirm the new setting the VU PPM function Press the ESC key twice cursor moves to the left top Press the enter key to open the measurement menu Move the cursor down to VU PPM Press the enter key to confirm the new setting FAST ACCESS SETUF n al amp WOLUME Ru GAIN CTRL or 5 Volume indication Decrease increase volume hot keys Fig 3 03 Volume setting CH STAT 5 47999 18 IF Em 4 5 Co Kl 510 m COMSUHER LINEAR FCH eFS 48 0kH2 m cc LUL1 m d CHRITIEL fa 5 eSOURCE 7 m HAMMEL 7 fia ID Fig 3 04 PPM setting A B sc en m 2 CHANNEL fa EMFHAS eSOURCE 7 m CHANNEL 7 fia ID UU PPR LEWEL THD N SCOFE CEA SOFFH Fig 3 05 VU PPM mode First Steps 8 Change auto power off time Movethecursorto SETonthe Vu PPH 5 FD A EET3 menu line and press the enter q1888 1H Hz HAY 03 9 key 4 3 Upp 1 hnn H D3 dEF Select AUTO POWER OFF with the cursor keys and press the enter key Setthetime to 60 MIN with the cursor keys d 40 30 ins Con 4H OkH2 2 cCHh Confirm the setting with the J Tx enter key AUTO
15. 60 dBF remains displayed and changes for muted signals to three dots The number of full scale values causing clipping indication can be set in the SETUP menu PPM OVER THRESH By default it is set to three samples 24 Basic Operation Emphasis The Digilyzer does not de emphase any pre emphased signals In case the incoming signal is marked as pre emphased in the channel status the Digilyzer indicates this with PRE EMPH displayed below the PPM meter at all measurement functions with display space available ESET Fig 4 13 Emphasis Indication Quick Status Information In the measurement functions BIT STAT VU PPM LEVEL and THD N the essentials of the channel status information are displayed continuously LEUEL SAFO 41999 18 Hz TS 4 3 FRE EHFH 8 034 8 034 FRO EI TRET ETM Format Sampling Resolution Channel frequency word length information Fig 4 14 Quick status information The consistency check is constantly running as a background task It highlights any parameter showing inconsistency within the physical parameter For example as shown in the above figure the resolution claims to be a 24 bit but in reality it is lower 25 Measurement Functions 5 MEASUREMENT FUNCTIONS Channel Status Digital audio signals formats AES3 and S PDIF have additional information called channel status encoded in the signal bit stream The Digilyzer directly translates the
16. A the left side of a headphone Channel B the right side of a headphone Indicator for Operation Low Battery A moving sine symbol indicates that the unit is running properly FE Alternatively this field shows low battery indicator E FRE EHFH Fig 4 06 Low battery indicator Basic Operation Setup Screen The setup screen allows to customize basic settings of the Digilyzer SETUF AUTO FOHER OFF AUTO LIGHT OFF 3 SEC FFH OUER THRESH 3 51 15 HULTIFLE SETUF DISAELE FRESS ESC TU SETUF Fig 4 07 Setup screen AUTO POWER OFF defines the time of the automatically switch off after the last key press AUTO LIGHT OFF defines how long the backlight stays on after being activated PPM OVER THRESH defines the number of full scale values causing a clipping indication at the ppm meter MULTIPLE SETUP allows four users to store their individual settings To enable the multiple setup mode set the corresponding entry to ENABLE The next time the Digilyzer is switched on the user will have to select the individual setup ID 1 2 3 or 4 in the startup screen All parameter settings in all measurement modes are now stored under this ID at the switch off and are recalled if this ID is selected at the next start up DIGITAL AUDIO ANALYZER SELECT SETUP 3 BIIDDDRDRG HD INITIALIZING SYSTEM Fig 4 08 Multiple user startup screen 20 Basic Operation F
17. Digilyzer DL 1 User Manual NTI Contact Headquarter NTIAG Im alten Riet 102 9494 Schaan Liechtenstein Europe Tel 423 239 6060 Fax 423 239 6089 E mail info gnti audio com Home www nti audio com NTI AG All rights reserved Subject to change without notice Release 2 20 3 Oct 2008 Software D2 20 Digilyzer Minirator Minilyzer MiniSPL MiniLINK and Minstruments are registered trademarks of NTI 2 INDEX 1 INTRODUCTION 4 CE Declaration of Conformity 4 International Warranty and Repair 5 Warnings 6 Test amp Calibration Certificate 6 Scope of Delivery 6 2 OVERVIEW Functions 8 Monitoring 9 Connectors 12 Battery Replacement 13 3 First STEPS 14 4 Basic OPERATION 17 5 MEASUREMENT FUNCTIONS 26 Channel Status 26 Bit Statistic 32 Logger 34 VU PPM 38 Level Measurement 40 Level Peak 41 Level RMS 42 Level Sweep 44 THD N 46 Scope 48 6 TROUBLESHOOTING 49 7 ACCESSORIES 50 MiniLINK 50 Mains Power Adapter 50 Pouch 51 Minstruments System Case 51 8 APPENDIX 52 1C2f Format 52 Logger Event Coding 54 Professional Format Coding 57 Consumer Format Coding 60 9 TECHNICAL SPECIFICATION 62 Introduction 1 INTRODUCTION Congratulations and thank you for buying NTI s Digilyzer DL1 a product specially suited for professional audio applications The Digilyzer offers advanced analysis functions expected only in much larger and more expensive systems We are
18. EAK as or with a very small value The 1C2f format is displayed as part of the channel status menu in the professional format At many applications this information is not configured in the channel status details of the digital audio signal The 1C2f mode is part of the consistency check In case the channel status indicates 1C2f mode and 1C2f mode is not selected in the format menu or vice versa the consistency error window is displayed 1C2f mode is defined for AES3 professional mode only The Digilyzer supports the 1C2f mode also in the consumer and ADAT format No monitoring is available for ADAT signals FAST ACCESS SETUF Du ADAT iceF HODE Ch CONTRAST Fig 8 02 1C2f with ADAT format The DL41 allows you to switch to 1C2f mode even if the input sample rate is higher than 48 kHz This may cause the DL1 to unlock to the input signal or could exceed the processing power of the Digilyzer This is indicated as CARRIER FREQUENCY TO HIGH in the quick status information on the bottom of the display 53 Appendix Logger Event Coding The following chart lists all details to the Digilyzer Logger event coding The remark column states Any format not applicable n a for the individual events Maximum amount of events indicated per second rec s sample each sample is counted DL1 event description remark Carrier based events CR UNLOCK Digilyzer i
19. ED 3 5 Emphasis 000 2 CHANNEL Emphasis not NO EMPHAS indicated 100 2 CHANNEL 50 15 ms emphasis 50 15uS EM others RES FMTINF 1 0 7 Category code Includes information about the equipment type e g MINI DISK SYSTEM MD PLAYER RECORDER 2 0 3 Source number 0000 SOURCE 7 others SOURCE number 1 15 4 7 Channel number 0000 CHANNEL others CHANNEL letter A O 3 0 3 Sampling frequency 0010 FS 22050Hz 22050Hz 0000 FS 44 1kHz 44 1kHz 0001 FS 88 2kHz 88 2kHz 0011 FS 176400 176400 60 Appendix Byte Bit Bit info Digilyzer Explanation Channel status Quick view 3 0 3 0110 FS 24 0kHz 24 0kHz 0100 FS 48 0kHz 48 0kHz 0101 FS 96 0kHz 96 0kHz 0111 FS 192kHz 192 0kHz 1100 FS 32 0kHz 32 0kHz 1000 FS NO ID FS NOID others FS RSRVD FS_RESERVD 3 4 5 Clock accuracy 00 ACC LVL2 1000PPM 01 ACC LVL3 VARIPITCH 10 ACC LVL1 50PPM 11 ACC RSRVD 4 1 3 Word length 000 WLEN NOID applicable if byte 4 001 WLEN 23BIT 23BIT bit 0 is 15 010 WLEN 22BIT 22BIT 011 WLEN 21BIT 21BIT 100 WLEN 20BIT 20BIT 101 WLEN 24 24BIT 110 WLENRSRVD 111 RSRVD 000 WLEN NOID applicable if byte 4 001 WLEN 19BIT 19 bit 0 is 0 010 WLEN 18 18 011 WLEN 17 17BIT 100 WLEN 16BIT 16BIT 101 WLEN 20BIT 20BIT 110 RSRVD 111 RSRVD 4 4 7 Original sampling frequency 1111 ORIGNAL FS 44 1kHz 1110 ORIGNA
20. L FS 88 2kHz 1101 ORIGNAL FS 22050Hz 1100 ORIGNAL FS 176400 1011 ORIGNAL FS 48 0kHz 1010 ORIGNAL FS 96 0kHz 1001 ORIGNAL FS 24 0kHz 1000 ORIGNAL FS 192kHz 61 Appendix Byte Bit Bit info Digilyzer Explanation Channel status Quick view 4 4 7 Original sampling frequency 0111 ORIGNAL FS RESVD_7 0110 ORIGNAL FS 8 0kHz 0101 ORIGNAL FS 11025Hz 0100 ORIGNAL FS 12 0kHz 0011 ORIGNAL FS 32 0kHz 0010 ORIGNAL FS RESVD_2 0001 ORIGNAL FS 16 0kHz 0000 ORIGNAL FS NO ID 9 TECHNICAL SPECIFICATION Frame Measurements Signal Carrier Frame Event logger Recording resolution Recording duration Display At Recording intervals Single errors in one recording interval Consumer Professional up to 24 bit Sampling frequency f 32 96 kHz Also supports Interleaved 96 kHz mode on all inputs single channel double sampling frequency modes Level FS level RMS signal frequency THD N event logger frequency sweep PPM scope overload detection Full Scale detection Sampling frequency accuracy 2 5 ppm carrier level Channel status according to AES 3 ed 2003 and IEC 60958 3 ed 2003 bit statistics selectable 1 10 1 10 1h selectable 8 83 8h 83h 20days 17 10 1 10 1h 10h 24h all max 500 10 36 000 62 Input connectors Monitor Display Power supply Dimensions LxWxH Weight Temperature Humidity Technical Specification AE
21. S 3 110 Ohm XLR S PDIF RCA TOS Link ADAT AES 3id 75 Ohm using Chinch BNC adapter phantom power resistant Built in speaker headphone connector Backlit graphic LCD 3x AA size dry batteries alkaline typical lifetime 8 hours External DC power 7 5 VDC 500 mA stabilized use NTI recommended parts only 163 86 42 mm 6 4 x 3 38 x 1 63 300 g 10 5 oz incl batteries 0 to 45 C 32 to 113 F 90 96 R H non condensing 63 Quick Guide Digilyzer Escape On Off 2 sec Enter Cursor keys Measurement Function Menu CHANNEL STATUS PAGE 1 2 3 BIT STATISTIC LOGGER VU PPM LEVEL PEAK REL SWEEP THD N SCOPE 5 06 E 500 TH 04 08
22. acquisition of all DL1 functions in conjunction with the easy to use MiniLINK PC software MiniLINK is an upgradeable kit for all existing and new Minilyzers It consists of small plug in USB interface board that can be easily installed without any tools MiniLINK allows Storing measurement results and screenshots into the DL1 flash memory Logging on line measurement results onto the PC Mains Power Adapter The Digilyzer can be powered by batteries or by an external power This power adapter is ideally suited for external power supply Applicable for european connector types only Fig 7 01 MiniLINK Cable length 2 meter Fig 7 02 Mains power adapter 50 Accessories Pouch The soft pouch protects the Digilyzer against shocks dust and water With its convenient belt clip you can keep it close to you even when you need both hands for other tasks Fig 7 03 Pouch Minstruments System Case Store your valuable Minstruments test system consisting of the Minirator MR1 the MiniSPL and the Minilyzer ML1 or Digilyzer adequately in the compact system case which gives you extra space for cables connectors and other accessories you wish to bring along when you are out in the field Fig 7 04 System case checking audio systems Minstruments ma 51 Appendix 8 APPENDIX 1C2f Format The AES3 standard includes the following two options for 96 kHz sample rate operation
23. ast Access Setup Some key combinations allow fast access to the most frequently used settings Pressing a hot key combination shows the FAST ACCESS SETUP screen and changes the value If you don t remember the key combinations just press ESC for two seconds and the FAST ACCESS SETUP is displayed ESC enter ESC on off AGC on off mute unmute ESC up speaker higher LCD contrast Speaker muted AUT GAIN ESC down CTRL On lower LCD n trast Ls TM CONTRAST ESC left ESC right volume down volume up Fig 4 09 Fast access setup screen The symbolized keypad on the left part of the screen indicates the hot keys function of the individual buttons The actual adjustment is shown on the right side of the display VOLUME setting of speaker volume The volume control and the mute unmute settings do not influence the analog monitoring Analog audio signals are made audible with the speaker but no measurement result is displayed In this way analog audio signals are immediately indicated to the user To analyze an analog signal the Minilyzer ML1 is recommended to be used AUT GAIN CONTROL AGC all incoming signals are leveled to the same loudness even if the signals are 60 dBF The AGC amplifies a signal up to 140 dB so even dithering noise on a silent line is audible CONTRAST setting of the display contrast For the detailed readout of fast changing display indications e g SCOPE or VU PPM an increased LCD co
24. ay occur on channel A or B separately e g AU OVERLOAD and be indicated 36 Measurement Functions Masking events For a better overview some events can be hidden from the logging display e g the audio signal clips very often or the channel status changes permanently because of time code Therefore the Digilyzer offers you the possibility to select which events you want to see or hide Select the field MASK to enter to the LOGGER DISPLAY MASK screen LOGGER DISPLAY HASK Event visible at E ECARRIER event list 1 SAUDE FRERUEDCH Event masked STATUS SR 2 at in THTEGETTY event list All masking on off FRO 2 STREG gHEIT Fig 5 23 Logger display mask The first column displays all event categories The complete event category or single events of each category can be masked The filled square indicates that the event is displayed at the event list NOTE Masking does not effect the recording All events are logged at anytime Overview of used event coding See Appendix Application hint To read out one specific event only select in the LOGGER DISPLAY MASK the ALL ON OFF field and press enter gt all squares will be empty selectthe specific event you are looking for press enter and the specific square is filled up 37 Measurement Functions VU PPM The Digilyzer offers a combined VU and PPM meter for two channels stereo This combination enables a qu
25. be displayed in three different units decibel relative percent of full scale x1 number In case the measured RMS value is smaller than 100 dBr the Digilyzer displays lt 100 dBr Filter The audio signal decoded from the digital audio stream can alternativelly be filtered with the following filters prior to the RMS or THD N calculations HP400 highpass 400 has a good rejection in the area of main frequencies so hum problems may be easily examined and localized The HP400 is also used to measure quantization noise 22 22k bandpass 22 22k is used to define the commonly used measurement bandwidth from 22Hz to 22kHz 42 Measurement Functions Display mode Giving a better readability the display mode determines the rapidity of following up the input signal changes The available modes are SLOW 3 seconds averaging 1 seconds averaging FAST no averaging If averaging is active measurements are smoothed in an exponential way exponential time constant before being displayed 43 Measurement Functions Level Sweep The Digilyzer supports a RMS based frequency sweep This function can be applied to measure the frequency response of devices During a frequency sweep the Digilyzer records the Level RMS of every input signal that has a stable frequency and level provided that the frequency is higher than the one of the previous sample otherwise the sample will be neglected
26. contents of the status bits and displays the results on the channel status screen thus enabling the user to directly read the meanings The proper interpretation of the status bits is carried out automatically by the Digilyzer The first bit of the channel status indicates whether the status bits are configured in professional or consumer format The professional format has various additional information encoded in the channel status whereby in the consumer format the copy protection is the major concern ADAT signals do not carry any status information so the display will indicate CHANNEL STATUS NOT AVAILABLE ON ADAT To display the complete status information three different pages are available page 1 main status information page 2 additional status information page 3 status information in hex code The page number is displayed at the top center of the measurement screen Select the page number with the cursor and press enter to select the next page 26 Measurement Functions Professional Format Status Page number memory 71 999 78 Hz 4 5 Upp Cod REL STU Format Signal emphasis Data coding Channel mode Fs locked User bit format Sampling frequ BAUR Auxiliary bit use Fs scaling m HLEN Word length Fig 5 01 Channel status professional page 1 Status Page number memory 41999 18 Hz 4 5 Upp amp REL STO Level alignment Data reliability Reference signal
27. convinced you will enjoy using it NTI products are manufactured in compliance with the highest quality standards and marked with the CE sign CE Declaration of Conformity We the manufacturer NTIAG Im alten Riet 102 9494 Schaan Liechtenstein Europe hereby declare that the product Digilyzer DL1 released in 2001 conforms to the following standards or other normative documents EMC Directives 89 336 92 31 93 68 Harmonized Standards EN 61326 1 This declaration becomes void in case of any changes on the product without written authorization by NTI Date 01 11 2001 Signature 7 fut Position of signatory Technical Director CE Introduction International Warranty and Repair International Warranty NTI guarantees the Digilyzer DL1 and its components against defects in material or workmanship for a period of one year from the date of original purchase and agrees to repair or to replace at its discretion any defective unit at no cost for either parts or labor during this period Restrictions This warranty does not cover damages caused through accidents misuse lack of care the attachment or installation of any components that were not provided with the product loss of parts connecting the instrument to a power supply input signal voltage or connector type other than specified or wrongly polarized batteries In particular no responsibility is granted for special incidental or consequential damages Thi
28. e Sum of event occurances Event list in rh VALIDITY AU OVERLOAD 2 STREG Event name Fig 5 21 Overview records Display interval The events occurred during the user defined display interval are summarized and shown on the Digilyzer The bundling of logger data helps to make the events more clear and easy to overview After the logging is completed the display interval may be changed Zoom out the intervals e g the error log has a recording interval of ten seconds and you want to know how many events have been found in the last hour just zoom out to a display interval of one hour Zoom in to get a more detailed information about the time of individual events occurred Set to ALL maximum zoom out to get an overview of all records 35 Measurement Functions Displaying events The display of the event logger is split into three areas LOGGER RE23 n E SET Se HEEN Nas 335 UNLOCK Eventllst 1 CK CONFIDENCE 10 ER VALIDITY info line Fig 5 22 Detailed info of records Event list After the cursor is navigated to the event list it can be scrolled with the up down key In this mode the data can be zoomed by using the left and right arrow keys Press ESC to quit the event list Logger info line While the cursor is in the event list the individual detailed information to the selected event is displayed Many errors m
29. e cursor and pressing the enter key Fundamental frequency The input signals that fundamental or most dominant frequency are displayed NOTE The scaling of the SCOPE display cannot be changed manually 48 Troubleshooting 6 TROUBLESHOOTING In case the Digilyzer is malfunctioning the software may be reset to factory set up as described below System Break Down Switch off the device Reset the Digilyzer to the default status by pressing the ESC button and switching on the Digilyzer simultaneously Release the ESC button The below screenshot will appear on the display stating on the bottom line LOADING DEFAULT SETUP Verify the correct operation DIGITAL AUDIO ANALYZER DL1 Serial number gt 5 01 00 4 release LOADING DEFAULT SETUP number Software Fig 6 01 Start up screen loading default setup In case you find system breakdowns happening several times or your device is malfunctioning please note serial number and software release number and contact the local NTI representative in your country For contact details see the NTI web page www nti audio com Monitoring In two channel measurement functions e g Level peak the monitoring signal of channel A and B are mixed together stereo In case one of the channels is muted the stereo monitoring signal has a reduced level 49 Accessories 7 ACCESSORIES MiniLINK MiniLINK allows documentation and data
30. e than specified Do not insert batteries of different types Note the correct polarities of the inserted batteries Remove the batteries as soon as they are flat 13 First Steps 3 FIRST STEPS This chapter is a quick guide explaining how to make the first measurements with the Digilyzer The example assumes an S PDIF signal as input e g a CD player with S PDIF output playing a music CD 1 Insert batteries 2 Connect the S PDIF signal to the RCA input 3 Reset the Digilyzer to default state by holding down the ESC key and simultaneously pressing the ON button for about two seconds Fig 3 01 Digilyzer 4 Select S PDIF as input format Move the cursor inverted box one step right to the format menu by using the cursor keys 41999 70 E 4 5 Upp Press the enter key to open g the format menu 8 BHdBF enter key Con 2 cCHh Select S PD and press the gt The channel status information is displayed and music is audible trough the built in speaker Fig 3 02 Format selection Activate First Steps Decrease the volume Press and hold the ESC and left cursor key simultaneously This causes the FAST ACCESS SETUP screen to be displayed and the volume to decrease Measure the accuracy of the sampling rate The accuracy is measured in ppm so the unit of the sampling frequency has to be changed as follows Move the cursor to the
31. en used This event occurs if the pro 1 rec s channel status signalizes a 1C2f mode but the Digilyzer is not set to 1C2f mode or vice versa 56 Appendix Professional Format Coding Overview of codings and abbrevations used for the professional channel status display MSB left Byte Bit Bit info Digilyzer Explanation Channel status Quick view 0 0 Use of channel status 0 CONSUMER CON Consumer format 4 PROFESSNAL PRO 1 Data coding Professional format 0 LINEAR PCM Linear PCM samples 1 NO LIN PCM No lin PCM samples 2 4 Audio signal emphasis 000 EMPH NO ID Emphasis no ID 001 RES EMPHAS Reserved 010 RES EMPHAS Reserved 011 RES EMPHAS Reserved 100 NO EMPHAS No emphasis 101 RES EMPHAS Reserved 110 50 15uS EM 50 15 ms emphasis 111 CCITT EMPH CCITT emphasis 5 Locking of source sample frequency 0 LOCK NO ID Locked condition 1 UNLOCKED not indicated 6 7 Sampling frequency 00 see byte 4 bit 3 6 01 FS 48 0kHz 48 0kHz 10 FS 44 1kHz 44 1kHz 11 FS 32 0kHz 32 0kHz 1 0 3 Channel mode 0000 CHNLNOID Mode not indicated 0001 TWO CHANNL 2 CHN Two channel mode 0010 SINGLE CHN 1 CHN Single channel mode 0011 PRM SEC CH PR SE Primary sec mode 0100 STEREO CHN STREO Stereophonic mode 0101 MOD RES Reserved 0110 CH MOD RES Reserved 0111 1CH FS 2M FS 2 1C2f mode 1000 1 FS 2 L FS 2L 1C2f stereo left 1001 1CH FS 2R FS 2R 1C2f stereo right 1010 CH MOD RES _ Reserved
32. g devices The intention is to make the material as loud as possible without exceeding the maximum peak level Simply feed the digital audio signal into the Digilyzer and it displays for both channels the peak and VU levels The closer the VU level is to the PPM level the higher is the compression of the audio material 39 Measurement Functions Level Measurement The Level menu features three different measurement selections to choose from Level peak Level RMS Level sweep n RE REL Gro EHFH S wubDHT bo rz an ukHz SES x 1 000 Fig 5 40 Level selection menu Level peak measurements indicate thought digitally the maximum number value of the input signal Level RMS measures the power of the signal The RMS functions of the Digilyzer such as Level RMS sweep and THD N are available as single channel functions only Level sweep based on RMS measurement Application hint In digital audio the level peak measurement is basically mostly used while in the analog area RMS values are important Whenever you want to make measurements in the area of frequency response RMS is usually the correct choice 40 Measurement Functions Level Peak The Level peak function displays the actual peak value of the incoming digital audio signal The digital peak level measurement provides information about the peak to peak
33. ick and accurate overview on the momentary peak level and RMS value power of the signal which tends to be an indication for the volume DUNS RB ES n E SET 47999 78 Hz HAH 16 1 dEF L Numerical 4 5 pp 3 HAH 46 1 Peak hold Channel A Over 40 3n an i indicator Channel B e Peak hold for PPM 48 0kH2 VU meter PPM meter thick bar thin bar Fig 5 30 VU PPM panel Numerical peak hold indicates the all time max input peak level of each channel since the VU PPM mode has been entered It may be reset by placing the cursor on this value and pressing the return key Over indicator Clipping indication the number of full scale values causing this clipping indication may be adjusted in the SET menu PPM OVER THRESH VU PPM Indication Digilyzer features VU volume units indicated as the thick bar displays the average volume level of the audio signal PPM peak program meter indicated as the center bar displays the peak level of the audio signal 38 Measurement Functions Application hint Broadcast levels are limited to a maximum output peak level This is in order to not to overload the transmission lines and to avoid unpleasant and audible distortions During tuning through the radio stations it is clearly noticeable that some channels are much louder than others purposely to increase awareness This is accomplished by using compressors and other dynamic signal processin
34. ignal but only zeros have 10 rec s been found AU WORDLEN The measured word length or the 10 rec s audio signal has changed do not confuse with the word length signalized in the channels status Channel status based events CS CON PRO The professional consumer n a ADAT indication bit in the channel status 10 rec s has changed CS EMPHASIS emphasis bit of the channel n a ADAT status has changed 10 rec s cs The signalized sample frequency in n a FREQUENCY the channel status has changed 10 55 Appendix DL1 event description remark CS WORDLEN The signalized word length in the n a channel status has changed ADAT 10 rec s CS CHA lt gt CHB The status of channel Ais not equal to n a the channel status of channel B ADAT 10 rec s CS OTHER Other bits than those mentioned in n a this table changed the channel status 10 rec s Consistency check based events IC The sampling frequency indicated in n a FREQUENCY the channel status is not equal to the measured sampling frequency 1 rec s IC WORDLEN The world length indicated in the n a channel status is not equal to the measured word length 1 rec s IC FREQPPM The measured accuracy of the n a sampling frequency is worse than the accuracy indicated in the channel 1 rec s status consumer mode only IC MODE1C2f In the professional format the 1C2f n a mode should be signalized wh
35. ignal quality With decent short interconnection cables the carrier level of an AES3 signal is in the range of 2 to 7 Vpp ofa S PDIF signal is in the range of 200 to 700 mVpp With impedance problems involved or with long cables the AES3 signal level may drop to levels below these values so the reliability gets worse Error indicator box The Digilyzer checks the digital signal its protocol and recognizes a number of errors These errors can cause many audible effects which should ideally never occur An error is immediately indicated by the Digilyzer by filling the error indicator box black Afterwards the box empties within ten seconds 23 Basic Operation Following errors are analyzed visualized in the error indicator box Lock unlock Validity bit Confidence bit the received data eye pattern opening is less than half of a bit period indicating a poor link not meeting specs Bi phase mark coding error Parity error Carrier level below specification for AES3 and S PDIF input NOTE The lock unlock state is the only available error in the ADAT format PPM Meter Many measurement functions include a PPM meter displaying the measured level peak in bargraph form The scaling details are Signal clipping indication Channel A E SET Aa Channel B 60 dBF 10 dBF 3 dBF 0 dBF Fig 4 12 Bargraph markings NOTE Forsignallevels lower than 60 dBF the vertical line marked above with
36. ld press enter and use the up down keys The last recorded sweep curve will be stored internally even after leaving the sweep mode or switching off the Digilyzer As soon as the frequency sweep mode is re entered the curve will re appear on the graph until a new frequency sweep is started NOTE The auto power off is disabled during a frequency sweep recording Test signal The sweep measurement can be carried out by using the sweep signal produced by the Minirator MR1 the NTI Wavefile Generator software or other external sweeps with the following pre conditions Signal type Stepped sweep Step time min 1 second step Frequency step min 196 increase Max number of steps 160 Start frequency 20Hz 45 Measurement Functions THD N The THD N function Total Harmonic Distortion Noise calculates the deviation of the input signal from an ideal sine wave This measurement is most important to check and qualify analog digital converters RE 3 en SET 1 91 ppm THD N Wana C result Full scale indication Filter A LINE AR j Display mode a eT Fundamental Level RMS frequency Fig 5 50 THD N screen The Digilyzer is able to calculate THD N values down to 100dB 0 001 For better THD N values lt 100 dB lt 0 001 are displayed THD N results of the selected channel may be displayed in dB or Full scale indication appears whenever one sample reaches f
37. nd recalled Store actual status Recall memory Fig 5 08 Channel status memory field Select STO with the cursor and press enter to store the actual status information If any bit in the status is now altered compared to the currently stored status the square flag on the left side of RCL will turn into the toggling triangle indicating discrepancies By selecting and holding RCL the memorized status information may be recalled for a quick check of the status difference The status memory remains also valid after switching off the device 31 Measurement Functions Bit Statistic The bit statistic function visualizes the state of all bits in the digital audio signal VUCP data Actual word length LSE AUDIO DATA ASE audio data Auxiliary bits 4 546 channel A DUDDERIIiffffff fIfifff f Channel B FRO 44 ikH2 STEEN 8B EIT Fig 5 10 Bit statistic panel The display allows you to see quickly which bits of the audio data are permanently low 0 high 1 or changing indicated via the up down arrow symbol Actual word length The actually measured resolution is displayed VUCP data The following bit information is displayed V validity bit indicating whether the digital audio bits may be converted to an analog audio signal if the validity bit is permanently 0 the incoming data is valid 0 user bit containing any user bit information C status bit containing the channel status informa
38. nlITOR 011 Flashing Fig 2 07 Analog monitoring Overview Debugging or listening The built in speaker on the rear side gives the acoustical response of the measured signal everywhere and any time without the need of a headphone For the users convenience a good headphone may be connected for listening in superior quality up to 24 bit 96 kHz The headphone output may be used as D A converter e g some recording with a minidisc player is requested but no analog output is available Oops no signal Often no signal is found during troubleshooting at digital audio lines Can this be The Digilyzer offers a digital realized AGC automatic gain control to zoom the digital signal So even a change of the LSB least significant bit is fully audible The tremendous dynamic range of 140 dB allows to listen to the smallest disturbances For example someone just has closed the fader or muted the signal so just activate the AGC and listen even dither noise will be audible FAST ACCESS 1 115 EE are Description EM hotkey AGC ON OFF mmm CONTRAST Hotkey symbol Fig 2 08 Automatic gain control All the above monitoring functionalities can be controlled by using hotkeys displayed in the FAST ACCESS SETUP menu Dual domain measurements Level RMS and distortion THD N measurements are fundamental to check A D converters The complete test system even checks mixed mode applications such
39. ntrast is recommended to be set 21 Basic Operation Display Basics Debugging and analyzing digital audio signals need a few explanation to be best visualized at the same time For example a recorder does not recognize the incoming signal so it is important to find out Is there a digital or an analog signal on the line Is there any audible information on the digital line What is the format of the data consumer professional Does the signalized channel status correspond to the data Whats the level and the frequency of the carrier and much more In many measurement functions the Digilyzer answers all these questions at the same time For easy readout several screen elements are available on most functions 8171 ES A ESET gt Carrier 41999 18 Hz PPM meter information 4 5 Una Co Emphasis 15 1dBF 15 14 FRO 51 Quick status information Fig 4 10 Screen elements 22 Basic Operation Carrier Information LEVEL Efi U 1 H H H 1 r e Carrier frequency J U A A Error indicator box Carrier level Fig 4 11 Carrier information Carrier frequency displays the measured frequency in Hz ppm deviation to the next standard frequency Carrier level indicates the measured carrier level in Vpp Levels higher than 5 0 Vpp are indicated as gt 5 Vpp Application hint The carrier level is a robust first approximation of s
40. onable and are split into the following categories Carrier based events Frame based events Audio signal based events Channel status based events Consistency check based events Basics of logging Whilst a log is running the Digilyzer acquires all events details are listed in the Appendix The Digilyzer bundles all events which are occurred within the recording interval It generates a new record when a recording interval has finished The recording interval can be adjusted at the start of a new log Basic setting of logger data LOKER TES EIST Record SIS 3 1 Z et Seld DI RECORD gn Recording RESOLUTION 1 interval HRS LENGTH Hh Calculated LPR VALLVL ET maximum FRO STRE BHEIT recording length Fig 5 20 Recording setup window 34 Measurement Functions Select the REC field press enter and the RECORD window is displayed Select the recording interval of the recording The max recording length is defined by this resolution The Digilyzer has the capability to store data of 500 recording intervals A higher recording interval is causing a shorter maximum recording length Select and confirm GO to start the logger function The recording setup window disappears and the REC field is flashing The logging may be stopped by pressing the enter key at the REC field Sum of all events in event list Display interval LOGGER HESa A 27 Mask fram
41. res The cursor position is represented by an inverted display white on black of the field holding the cursor When the Digilyzer is on it will utilize the same measurement function settings as switched off the last time 17 Basic Operation Menu Bar The menu bar allows the user to select the Measurement Input Input Setup Battery status function source format screen indication only 41999 18 Hz 4 5 Upp Co 1 1dBF 16 1 dBF FRO 2 STREG gHEIT Fig 4 02 Menu bar SF DCH AISET E e II nci sro IAL si EHPFHHS m5TEREO fio 2 guEIT mF5 1 000 Fig 4 03 Measurement function menu LEVEL AESI 41999 18 4 5 Upn C B ke BF 8 64dBF Cof 8 A EISE Fig 4 04 Input source menu 18 Basic Operation Any of the following formats may be selected AES3 SIPD abbreviation for S PDIF TOSL abbreviation for TOS LINK ADAT ADAT format via the TOS Link input 1C2f abbreviation of the single channel double sampling frequency mode see details to this mode in the appendix Fig 4 05 Format menu Selection of Input Channel Corresponding to the selected input source the available input channels may be selected The individual measurement result of each channel is displayed For a better understanding of the input channels Channel
42. s not able to lock to the 10 rec s CR LOCK input CR FS TO HIGH Sample frequency 1C2f mode is 10 rec s to high CR The received data eye pattern 10 rec s CONFIDENCE openingis less than half of a bit period problems on the transmission line CRBI PHASE Violation of the biphase mark format n a ADAT of the carrier signal 10 rec s CR LEVEL A change of the carrier level greater ADAT than 100mV generates this event amp TOSlink Details about the carrier level over 1 rec s age min and max carrier level are also acquired CR A change of the carrier frequency 1 rec s FREQUENCY greater than 1 Hz generates this event Details about the carrier fre quency min and max carrier fre quency are also acquired Frame based events FR VALIDITY Validity bit set This happens e g n a ADAT at a CD player with active error sample correction 54 Appendix DL1 event description remark FR PARITY Parity error The parity of the received na ADAT signals is not correct problems onthe 10 rec s transmission line FR CRCC Error The CRCC of the n a ADAT BLOCKCRCC channel status information is incorrect 10 rec s problems on the transmission line Audio signal based events AU A clipping in the audio signal is sample OVERLOAD detected The clipping detector is configured in the Digilyzer setup screen The setting for PPM OVER THRESH is stored within the log AU MUTE No audio s
43. s warranty becomes void if servicing or repairs of the product are performed by any party other than an authorized NTI service center or if the instrument has been opened in a manner other than speci fied in this manual No other warranty written or verbal is authorized by NTI Except as otherwise stated in this warranty NTI makes no representation or warranty of any kind expressed or implied in law or in fact including without limitation merchandising or fitting for any particular purpose and assumes no liability either in tort strict liability contract or warranty for products Repair of your Digilyzer DL1 In case of malfunction take or ship prepaid your NTI Digilyzer packed in the original box to the authorized NTI representative in your country For contact details see the NTI web page Be sure to include a copy of your sales invoice as prove of purchase date Transit damages are not covered by this warranty Introduction Warnings In order to avoid any problems during the operation of the instrument follow the rules listed below Use the instrument for the intended purpose only Neverconnectthe instrument to a high voltage output such as a power amplifier mains power etc Do not disassemble the instrument Never use the instrument in a damp environment Remove the batteries as soon as they are flat or if the instrument is not intended to be used for a longer period of time Test amp Calibra
44. tion this bit is normally changing P parity bit plausibility check of actual subframe this bit is normally changing Auxiliary bits These bits may be used for Audio data 2 channel e g talk back 32 Measurement Functions Audio data The two lines represent the 20 bit audio word for both channels LSB on the left side least significant bit MSB on the right side most significant bit The right bits always have to be active In case some of the left bits are constantly 0 the resolution of the audio signal is obviously less than the maximum of 24 bits including the aux bits The number of arrows from right to left may be counted to find the actual word length or binary resolution Application hints Any digital input signal causes that some of the MSB s are active The Digilyzer counts the number of active bits and displays the result as actual word length Sometimes bits of the input signal stucked on 0 or 15 In such a case a device in the signal chain is defective e g a receiver or a transmitter 33 Measurement Functions Logger The event logger records any irregularity of the digital signals Besides the common expectations events such as change of sampling frequency word length consistency check results and many more are covered What is an event Events are changes or irregularities of the input signal They are acquired for the two channels separately wherever reas
45. tion Certificate This is to certify the Digilyzer DL 1 is fully tested to the manufacturer s specifications NTI recommends to calibrate this test instrument one 1 year after purchase Thereafter the calibration and adjustment interval is subsequently one 1 year Scope of Delivery The following items are included with the packing Digilyzer DL1 Rubber Cushion Chinch BNC Adapter User Manual Overview 2 OVERVIEW The Digilyzer is a sophisticated tool used to analyze digital audio signals It is designed for easy and quick maintenance and debugging of digital audio equipment and installations Therefore the Digilyzer observes the signals from many points of view simultaneously An accurate overview of the actual signal condition is displayed on a large LCD and hidden errors are visualized e g consistency check Menu bar ES 318 ESET qq aT 1 Carrier information PPM meter 16 1 4 FRO STREO Quick status information Fig 2 01 Overview display By using the Digilyzer understanding and handling digital signals is simple However some basic knowledge about digital audio signals is essential Please refer to our homepage for some easy literature about digital audio basics Interface types The Digilyzer supports all common used interface types such as AES3 S PDIF TOS LINK and ADAT This range could be further extended by using external adapters or
46. ull scale This indication is independent of the clipping of the PPM meter Filter The audio signal decoded from the digital audio stream can be filtered with the following filters prior to the RMS or THD N calculations HP400 highpass 400 has a good rejection in the area of main frequencies so hum problems may easily be examined and localized The HP400 is also used to measure quantization noise 22 22k bandpass 22 22k is used to define the commonly used measurement bandwidth from 22Hz to 22kHz 46 Measurement Functions Display mode Giving a better readability the display mode determines the rapidity of following up the input signal changes The available modes are SLOW 3 sec averaging 1 sec averaging FAST no averaging If averaging is active measurements are smoothed in an exponential way exponential time constant before being displayed Application hints Whenever one sample reaches full scale slight clipping of the signal is possible so the THD N value may degrade Therefore try to level the signal so the full scale indication does not appear An analog to digital A D converter may show the following errors at the signal conversion The imperfect linearity of the converter adds hopefully little new harmonics to the signal Every analog part generates noise which is added to the signal during conversion AnA D converter has only a finite resolution e g 16 bit so
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