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dCS 900E / 902E

 User Manual

 Manual for Software Versions 1.3x to 1.5x

dCS

 Ltd 

12

th

 June 2000

Manual part no: DOC0029021E1

Page 51

Document No: OS-MA-D0002-902.1E1

Contact 

dCS

 on + 44 1799 531 999 

email to: [email protected]

(inside the UK r 44 with 0)

web site: www.dcsltd.co.uk

Straight forward dither always adds noise – it can only produce signals with a
noise floor higher than Q noise on its own.  However, the noise power added is
a few dBs for simple types.  Noise shaping adds rather more noise, but it can be
made to add it in parts of the spectrum that the ear is less sensitive to, so the
perceived noise (F weighted noise) is lower – up to three bits lower.  It results in
a signal that the ear hears as having a far 

lower

 noise floor than a 16 bit

truncated signal, rather than the “not much worse” of dither alone, even though
there is really more noise present

11

.

Truncation Type,  with
44.1 kS/s data rate

Noise,

unweighted,

rel 16 bit Q

noise

12

Noise,

F weighted,

rel 16 bit Q

noise

Comments

16 bit truncation

0 dB

0 dB

Unpleasant low

level effects

16 bit truncation with
Top Hat dither

3 dB

3 dB

Okay – can show

noise modulation at

low signal levels

16 bit truncation with
Triangular dither

4.8 dB

4.8 dB

All noise

modulation and

unpleasant effects

removed, but noise

floor is high

16 bit truncation with
Noise Shaped
Triangular dither

4.8 dB

1.2 dB

All noise

modulation and

unpleasant effects

removed. Not much

perceived noise

penalty

16 bit truncation with 3

rd

order noise shaping and
no dither

6.9 dB

-10.5 dB

Okay with input

noise floors down to

–102 dB

16 bit truncation with 3

rd

order noise shaping and
Noise Shaped
Triangular dither

11.0 dB

-9.2 dB

Unconditionally free

from truncation

effects with all

inputs

16 bit truncation with 9

th

order noise shaping and
no dither

23.4 dB

-17.9 dB

Okay with input

noise floors down to

–120 dB

16 bit truncation with 9

th

order noise shaping and
Noise Shaped
Triangular dither

28.2 dB

-16.7 dB

Unconditionally free

from truncation

effects with all

inputs

Table 11 – Dither and Noise Shaping Noise Powers

Noise shaping on its own is not perfect.  It relies on a small amount of noise in
the input signal to generate the frequency shaped correction signal, and if there
is very low noise in the input signal, this mechanism can break down. With
ADCs, however, this situation does not arise, because of the analogue noise in
the ADC and the input signal.

11

  DSD carries this further.  The principle is the same, but with DSD, there is more noise than there is signal,

even at full scale.  It is just that it is in a part of the spectrum the ear cannot hear.

12

  16 bit Q noise is -98.1 dB relative to a full scale sine wave.

Содержание 900E

Страница 1: ... this manual may be obtained from dCS Information contained in this manual is subject to change without notice and whilst it is checked for accuracy no liabilities can be accepted for errors 1 dCS Ltd is Data Conversion Systems Ltd Company registered in the England no 2072115 dCS 900E 902E Analogue to Digital Converter User Manual Software versions 1 3x to 1 5x 12 th June 2000 ...

Страница 2: ... Software Versions 1 3x to 1 5x dCS Ltd 12 th June 2000 Manual part no DOC0029021E1 Page 2 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk ...

Страница 3: ...orted are AES EBU XLR SPDIF RCA Phono SPDIF optical Toslink and SDIF 2 BNC dCS 902E only Dual AES XLR Syncing Master mode or can sync to Word Clock or AES reference Sync to video option available Functions Very high performance ADC free from gain ranging Multichannel Sync capability Noise shaping truncation 1 st 3 rd 9 th order Test Generator High quality 160 dB tone generator Can be noise shaped ...

Страница 4: ... AES Reference 24 Six Channel Set Up Sync ed to Master Clock AES 25 Six Channel Set Up Sync ed to Word Clock 26 Six Channel Set Up Sync ed to Master Clock Word Clock 27 Operating Several Units on One Remote Chain 28 Recording Dual AES on a 4 Track Recorder 29 dCS 900 902 Technical Information 30 Anti Alias Filtering 30 Clocking 31 Sample Alignment 32 Noise Shaping 36 Digital Interface Specificatio...

Страница 5: ... index and lists of figures and tables References to other sections in the text have the Section Name page in quotation marks and bolded IMPORTANT Important information is presented like this ignoring this may cause you to damage the unit or invalidate the warranty The manual is designed to be helpful If there are points you feel we could cover better or that we have missed out please tell us Warr...

Страница 6: ...lled and then left alone Unauthorised alterations to settings may be prevented by a panel lockout feature The unit is highly software based and more functions and features are added from time to time Software updates from dCS are free 2 What s in the Box The contents of the box are at least dCS 900 or dCS 902 User Manual Function Menu Guide Mains Lead 2 Spare Fuses Remote cable Remote software Mai...

Страница 7: ... Software Versions 1 3x to 1 5x dCS Ltd 12 th June 2000 Manual part no DOC0029021E1 Page 7 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk ...

Страница 8: ...n output e g from AES1 to your system or a DAC do this Press the Sample Rate button left hand end button to get the sample rate you want do this dCS 902 only Press the Output Format button right hand end to get the format you want Figure 1 Recording with a dCS 900 902 Set up like this the dCS 900 902 will operate in Master mode and the system it is connected to will have to lock to it You should h...

Страница 9: ... Noise Shaping button repeatedly until Auto is displayed Note that all the outputs are active simultaneously on the dCS 900 902 If the mode the unit is in needs them to be different they will be otherwise they will be the same and may all be connected to external equipment simultaneously if required Now you will need to familiarise yourself with how the front panel controls and the menu system wor...

Страница 10: ...or synchronising the unit to a Master Clock AES C is a Reference loop through directly coupled to it A terminating resistor may be turned on or off using the menu if several units are to be daisy chained AES A B Digital Outputs 3 pin XLR male 2 off Two AES EBU outputs which may be used independently dCS 902 only They may also be used as a Dual AES pair at 88 2 or 96kS s SDIF 2 CH1 CH2 Data BNC 2 o...

Страница 11: ...untry of origin dCS Ltd UK The underside of the unit will have a label on that contains a number such as 900 1A2 3B4 5C6 7D8 12345 This is the serial number but it also contains vital configuration information We will need this number all of it to give you support over the phone or to ship you software updates Digital Data Formats The unit provides five digital data i o formats AES EBU often refer...

Страница 12: ...le through the sample rates dCS 900 48 44 1 32 48 etc dCS 902 96 88 2 48 44 1 32 96 etc The dCS 902 also features a Multiplier button which allows you to step through more quickly Press the Multiplier button repeatedly to cycle through in one of the following sequences depending on the starting sample rate 48 96 32 48 96 etc 44 1 88 2 44 1 88 2 etc To change sample rates quickly use the two button...

Страница 13: ...uced by reducing the word length from the middle of the band where the ear is most sensitive to the top end or ultrasonic region where the ear is less sensitive or insensitive See the section Word Length Reduction on page 50 for more background Pressing the Noise Shaping button repeatedly cycles the unit through 5 noise Shaping characteristics The characteristic is shown briefly on the main displa...

Страница 14: ...The Set button is used with the other menu buttons white type on the front panel See the section The Software The Menu on page 18 Master Slave Menu Down The Master Slave button is dual function on its own blue type on the front panel it sets the clocking mode master or slave With the other menu buttons white type on the front panel it is the menu Down button In Master mode the calibrated voltage c...

Страница 15: ... With the other menu buttons white type on the front panel it is the menu Up button Pressing the Output Format button repeatedly causes the output format to cycle through the allowed options from the sequence Single AES Dual AES Single AES etc For sample rates of 48kS s or less Single AES is the only option IMPORTANT If the Output Format is set to 2 Dual AES do not use the SPDIF or SDIF 2 outputs ...

Страница 16: ...ion it will display an error message If the unit is being slaved the display also indicates which input connector it is slaved to xxx The sample rate in kS s 32 44 1 48 88 2 or 96 b xxx Slaved to Clk In r xxx Slaved to AES Reference in d xxx Temporary display during locking the unit has detected the base reference sample rate and is attempting to lock to it xxx Temporary display during locking the...

Страница 17: ...Software Versions 1 3x to 1 5x dCS Ltd 12 th June 2000 Manual part no DOC0029021E1 Page 17 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk ...

Страница 18: ...wise Overload Level Set Down otherwise Master Slave Up otherwise Output Format dCS 902 only Entering the Menu The Menu is entered by holding down the Step button and then pressing the Set button once The display will show Func You are now in the menu and the menu buttons now have their alternate meanings Moving through the Menu Press the Step button again to step through the Menu items listed belo...

Страница 19: ... Menu Displays the fitted software issue number Selects an alternative filter DSD mode is available on the dCS 904 only DSD mode is available on the dCS 904 only 1 5x Filt 1 Off Off Filt 2 Filt n Phone Heat 7 Seg Test Tone Displays dCS telephone number Displays the internal temperature Disables the 7 segment display when idle Runs a display self test routine Turns on and sets dCS 902E only a test ...

Страница 20: ...sted Pressing Set enters a submenu which accesses the following functions Level The tone level from 120dB0 to 0dB0 It can be changed in 0 1dB steps using the Up and Down buttons Freq The tone frequency from 0 001kHz 1Hz to just under half the sample rate It can be changed using the Up and Down buttons The step size is 1Hz for tones up to 100Hz 10Hz up to 1kHz and 100Hz above 1kHz On Off Toggles wh...

Страница 21: ...CS 900 press or hold down the Master Slave button to change this setting IMPORTANT Each unit in a daisy chain MUST be set to a different RS 232 address BNC O This feature is available on the dCS 904 only In the dCS 900 902 it is permanently set to SDIF Ref In Sets the mode of the AES Reference In AES C Out connectors The options are Loop Loops the Reference In through to the AES C output with no t...

Страница 22: ...lace 44 with 0 web site www dcsltd co uk Offst dCS 902 only Trims the appropriate VCXO frequency in master mode by up to 9 9ppm in 0 1ppm steps Use the Up and Down buttons to change this setting hold a button down to accelerate the change The trim is remembered Loc Panel Lock normally Off Set to On to prevent unauthorised changes using buttons The menu has to be accessed in the usual way to turn t...

Страница 23: ...Software Versions 1 3x to 1 5x dCS Ltd 12 th June 2000 Manual part no DOC0029021E1 Page 23 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk ...

Страница 24: ...set to Int You can record from the SDIF 2 output or one of the SPDIF outputs if preferred SPDIF Reference In AES EBU CH1 L Analogue Inputs more dcsltd co uk CH2 R CH1 L Sensitivity CH2 R Output B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See User Manual Before Connecting To Supply Serial No On Underside Out In MAINS ON OFF Before Removing Cover Disconnect Mains V 50 60Hz FUSE 2AT PUSH...

Страница 25: ...Inputs more dcsltd co uk CH2 R CH1 L Sensitivity CH2 R Output B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See User Manual Before Connecting To Supply Serial No On Underside Out In MAINS ON OFF Before Removing Cover Disconnect Mains V 50 60Hz FUSE 2AT PUSH PUSH PUSH CH1 From analogue sources dCS 900 902 CH2 AES 1 AES 2 AES 3 AES 4 AES EBU Outputs Wordclock Outputs 1 2 3 4 5 6 7 8 9 10 ...

Страница 26: ...rence In AES EBU CH1 L Analogue Inputs more dcsltd co uk CH2 R CH1 L Sensitivity CH2 R Output B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See User Manual Before Connecting To Supply Serial No On Underside Out In MAINS ON OFF Before Removing Cover Disconnect Mains V 50 60Hz FUSE 2AT PUSH PUSH PUSH CH1 From analogue sources dCS 900 902 CH2 SPDIF Reference In AES EBU CH1 L Analogue Input...

Страница 27: ...K Out CLK In Output C Remote See User Manual Before Connecting To Supply Serial No On Underside Out In MAINS ON OFF Before Removing Cover Disconnect Mains V 50 60Hz FUSE 2AT PUSH PUSH PUSH CH1 From analogue sources dCS 900 902 CH2 AES 1 AES 2 AES 3 AES 4 AES EBU Outputs Wordclock Outputs 1 2 3 4 5 6 7 8 9 10 11 12 External Sync Remote In Loop Out Mains Fuse 2AT On Off more dcsltd co uk V 50 60Hz D...

Страница 28: ...utput B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See User Manual Before Connecting To Supply Serial No On Underside Out In MAINS ON OFF Before Removing Cover Disconnect Mains V 50 60Hz FUSE 2AT PUSH PUSH PUSH dCS 900 902 SPDIF Reference In AES EBU CH1 L Analogue Inputs more dcsltd co uk CH2 R CH1 L Sensitivity CH2 R Output B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See ...

Страница 29: ...o 2 Set Ref In to Int and select a Filter If you are recording less than 24 bit words set Word Length as required and set Noise Shaping to Auto do this Replay the tape through a Dual AES capable DAC such as dCS 952 SPDIF Reference In AES EBU CH1 L Analogue Inputs more dcsltd co uk CH2 R CH1 L Sensitivity CH2 R Output B Output A SDIF 2 CH1 CH2 CLK Out CLK In Output C Remote See User Manual Before C...

Страница 30: ...energy smear but it may allow some of the signals in the input to alias irrevocably into the output data Once a signal has aliased it cannot be corrected However as far as the ear is concerned this may not matter The ear can tell the frequency of a signal up to a point As the frequency rises the accuracy with which the ear can tell what the frequency is decreases and above a limit all the ear can ...

Страница 31: ...degree of clock cleaning but even so signal quality may degrade if particularly poor slave clocks are used A consequence of the narrow bandwidth is that it takes quite a long time for the PLL to lock to a new clock frequency of the order of 2 seconds The PLL uses DSP assistance to keep this time acceptable Internal clock Accuracy when shipped 10 ppm Long Term Stability 10 ppm year at room temp Tem...

Страница 32: ... web site www dcsltd co uk Sample Alignment The dCS 900 902 align samples such that Word Clock out aligns with AES3 samples out the rising edge of word clock aligning with the start of the first illegal code in the X Z subframe preamble and the falling edge aligning with the start of the Y subframe preamble The scope shots below were taken in Master mode Figure 11 Word Clock and AES3 outputs 96 kS...

Страница 33: ... uk inside the UK replace 44 with 0 web site www dcsltd co uk When Word Clock in is used as a sync source in and out are related as below The lower waveform is the output the upper one is the input The misalignment is less than about 40 nsecs The scope shots below were taken with the unit sync d to Word Clock in Figure 13 Word Clock in to Word Clock out 96 kS s Figure 14 Word Clock in to Word Cloc...

Страница 34: ...e UK replace 44 with 0 web site www dcsltd co uk AES3 in and out are related as below where they are at the same sample rate and the AES3 input is used as a sync source The alignment is better than 40 nsecs Input is at the top of the displays output is at the bottom Signals are at the sockets on the dCS 900 902 and the unit was slaved to AES Ref In Figure 15 AES3 in to AES3 out 96 kS s Figure 16 A...

Страница 35: ...D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk AES3 data out is also related to the phase of Word Clock in The scope shots below were taken with the unit sync d to Word Clock Figure 17 Word Clock in to AES3 out 96 kS s Figure 18 Word Clock in to AES3 out 44 1 kS s ...

Страница 36: ...ng either at the latest possible minute If however you have to reduce word length the perceived noise gain taking into account the ear s response and the actual increase in noise mainly out of band in given in the table below Sample Rate kS s Perceived Gain F weighted 1 st Order dB Actual Increase in Noise 1 st Order dB Perceived Gain F weighted 3 rd Order dB Actual Increase in Noise 3 rd Order dB...

Страница 37: ...se Shape Plots 84 78 72 66 60 54 48 42 36 30 24 18 12 6 0 6 12 18 24 30 36 1 10 100 Frequency kHz Noise Amplitude dB 32 kS s 44 1 kS s 48 kS s 88 2 kS s 96 kS s 176 4 kS s 192 kS s Figure 19 1 st Order Noise Shapers implemented on dCS 90X 3rd Order Noise Shape Plots 84 78 72 66 60 54 48 42 36 30 24 18 12 6 0 6 12 18 24 30 36 1 10 100 Frequency kHz Noise Amplitude dB 32 kS s 44 1 kS s 48 kS s 88 2 ...

Страница 38: ...Hz Noise Amplitude dB 32 kS s 44 1 kS s 48 kS s 88 2 kS s 96 kS s 176 4 kS s 192 kS s Figure 21 9 th Order Noise Shapers implemented on dCS 90X The noise shaper plots above are all on the same vertical scales for easy comparison and the vertical grid is approximately 1 bit per grid line Note that for the audio band 9 th order noise shaping at 176 4 kS s or 192 kS s gives huge gains 8 bits or more ...

Страница 39: ... 20 V pk pk Connector XLR3 female XLR3 male Pin 1 Ground or shield Pin 2 Signal Connections Pin 3 Signal Table 4 AES EBU i o specifications SDIF 2 Input Output Type Single ended ground referred Impedance 100 25 Ω Sensitivity unloaded TTL TTL Maximum Wordlength 24 24 bits Damage level 10 V pk pk Time skew Word Clock in out 40 ns Connector BNC x 1 BNC x 3 CH1 left CH2 right Connections Word Clock In...

Страница 40: ...email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk SPDIF optical Output Type Optical Maximum Wordlength 24 bits Wavelength 660 nm Connector Toslink EIAJ CP 340 Table 7 SPDIF optical output specifications Remote control interface Input Output Type RS 232 Level RS 232 Data Format Contact dCS Connector 9 way D type male Table 8 Remote Control Interface Details ...

Страница 41: ...puts Type Balanced Format AES14 1992 Impedance 5 kΩ 5 kΩ CMRR 50 Hz 100 dB spec 50 Hz 120 dB typ 1 kHz 108 dB typ 10 kHz 80 dB typ 20 kHz 74 dB typ Level for Full Scale as shipped 20 dBu Trim range 6 dB Connector type XLR3 female Connections Pin 1 Ground or shield Pin 2 Signal Pin 3 Signal Table 9 Analogue XLR Interface Details The analogue inputs are balanced not floating with a stable high commo...

Страница 42: ...r Message C a Channel Status bit for the System Message P a parity bit IMPORTANT The AES EBU interface and the SPDIF interface have similar data structures although the messages are completely different The two structures are identified in the data domain by the use of the Consumer Professional bit bit 1 in the message A 1 indicates AES EBU format a 0 indicates SPDIF format The default AES EBU mes...

Страница 43: ...e 23 below show it over 16 m and 94 m using average cables The waveform at 94 m can still be decoded although it is quite degraded Cable delay is about 5 6 nsecs metre At 96 kS s twice the data rate the format was designed for the allowed cable length is less Figure 24 and Figure 25 below show this over 16 m and 94 m At 16 m the waveforms are still very good but at 94 m they are really quite unrel...

Страница 44: ...e 2000 Manual part no DOC0029021E1 Page 44 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk Figure 24 AES3 format at 96 kS s over 16 metres Figure 25 AES3 format at 96 kS s over 94 metres ...

Страница 45: ... block and frame structure The difference lies only in the voltage levels and the Channel Status bits the System Message It contains 24 bits of audio data IMPORTANT The AES EBU interface and the SPDIF interface have similar data structures although the messages are completely different The two structures are identified in the data domain by the use of the Consumer Professional bit bit 1 in the mes...

Страница 46: ... 256 stereo samples rather than the 192 of AES EBU There are 8 bits of message per channel per sample with a further 3 bits being used for an illegal code based sync code Of the 8 bits per sample the 8 in the first sample are reserved for system messaging and the rest are for User messages The 4 wires are Ground return Left Channel Right Channel Word Clock The sync codes can enable data recovery w...

Страница 47: ...sltd co uk Figure 27 SDIF 2 PCM format at 44 1 kS s SDIF 2 Messaging The SDIF 2 message is given in the table following The dCS 900 902 implementation sets all bits of the User message to 0 DESCRIPTION Definition Undefined 0000 0xxx Emphasis No emphasis Emphasis 15µsec 50µsec xxxx x00x xxxx x01x Dubbing Prohibit Dubbing allowed Dubbing inhibited xxxx xxx0 xxxx xxx1 Block Code Start of block Not st...

Страница 48: ...tion is comparatively efficient for a linear supply so these changes are kept to a minimum Consumption is independent of mains voltage selector switch setting Power Consumption with Mains Voltage measured as AC power into mains socket Nominal mains 25 W Mains 10 22 W Mains 10 27 W The actual intended supply voltage is shown on the rear panel 50Hz or 60Hz operation is not important the unit can use...

Страница 49: ...Measured from front panel to rear panel connectors Additional depth should be allowed to accommodate cable connectors note iii The high quality case is necessarily heavy consideration should be paid to appropriate support shelving when installing the units in a rack Operating Conditions The case of the dCS 900 902 have no ventilation slots or fan cooling to give quiet operation does not need to be...

Страница 50: ...als present the transfer function that the wanted signal sees is the convolution of the PDF 10 of the second signal and the staircase function The converse is also true the transfer function the additional signal sees is the convolution of the PDF of the wanted signal and the staircase function This aspect is not a problem with the dither types considered below but it can be with some highly frequ...

Страница 51: ... and unpleasant effects removed but noise floor is high 16 bit truncation with Noise Shaped Triangular dither 4 8 dB 1 2 dB All noise modulation and unpleasant effects removed Not much perceived noise penalty 16 bit truncation with 3 rd order noise shaping and no dither 6 9 dB 10 5 dB Okay with input noise floors down to 102 dB 16 bit truncation with 3 rd order noise shaping and Noise Shaped Trian...

Страница 52: ...oise shaped 13 signal generated and processed by a dCS 972 The equivalent simply truncated spectrum is shown in Figure 29 separately because it is so revolting In it we can see that at the signal level shown 90 dB error power from the quantising truncation is beginning to pile into the fundamental which is showing an amplitude error of 1 3 dB as well as all the unwanted harmonics This would show u...

Страница 53: ... inside the UK replace 44 with 0 web site www dcsltd co uk Spectra of 90dB 24 bit sinewave truncated to 16 bits with dither options dCS 972 SW v1 54 91 00 dB source signal 89 70 dB 16 bit truncated 160 140 120 100 80 60 0 2 4 6 8 10 12 14 16 18 20 22 Frequency kHz Amplitude dB 24 bit source data 16 bit truncation no dither 44 1 kS s sampling 1 44 kHz input 1024 point FFTs H6 Window Figure 29 Trunc...

Страница 54: ...low full checking P3D DSD Pro and Other Formats We can fit larger FPGAs to allow P3D DSD Pro and other formats This has to be done at dCS Ordering Options For A New Unit To order any option just tell us dCS 900 for use in country with options or dCS 902 for use in country with options IMPORTANT Always specify the intended country of operation otherwise we will assume that country of delivery is th...

Страница 55: ...Software Versions 1 3x to 1 5x dCS Ltd 12 th June 2000 Manual part no DOC0029021E1 Page 55 Document No OS MA D0002 902 1E1 Contact dCS on 44 1799 531 999 email to more dcsltd co uk inside the UK replace 44 with 0 web site www dcsltd co uk ...

Страница 56: ...ly verify the results before shipment There is a mains fuse in the mains socket accessible from the outside of the unit This may be changed by the user The current consumption of the unit is very low 150 mA at 110 V so it only blows if there is a fault usually if the unit is set to its low voltage setting 100 120V but has been plugged into a high voltage mains 220 240V Usually no other damage is c...

Страница 57: ...This gives you the option of installing new software in that unit To find out if there are any software updates available for your equipment call us or email us with your unit s serial number Hardware Update or Calibration You may wish to have your unit updated occasionally dCS offer this service we will install any modifications or updates that have occurred since your unit was first shipped and ...

Страница 58: ...Error Codes Sometimes the unit may misbehave If there is an internal reason an internal device error code may be displayed as follows Err xy an error xy see table below has been detected where xy values have the following meanings Code Description 01 E 2 memory EEPROM not present 02 Error initialising DSP 03 Error loading DSP 04 Error initialising DSP for coefficients 05 Error initialising DSP for...

Страница 59: ... power up Ensure there is power available on the mains cable and the unit s mains switch is On Check the rated supply voltage shown on the rear of the unit matches the local supply voltage Check that the fuse has not blown if so correct any obvious cause then replace the fuse as described in the section User Changeable Parts page 56 Check that the mains cable is pushed fully home into the mains in...

Страница 60: ...that the ADC AND the recorder are sync ed to it The unit fails to slave to a Master Clock Press the Master Slave button to select Slave mode If a suitable reference is connected the LED should light and the unit should lock after a few seconds Check that the Reference In or Clk In cable is connected correctly and not damaged Check that the Master Clock is switched on set to the right sample rate a...

Страница 61: ...thing we will discuss with you how you would like it to operate We value our customers and we want to make products that do what you want If You Need More Help Contact dCS Our office hours are 8 00 am to about 7 00 pm Monday to Friday UK time UTC in summer or UTC 1hr in winter Contact us by phone or fax on Inside the UK Outside the UK Telephone 01799 531 999 44 1799 531 999 Fax 01799 531 681 44 17...

Страница 62: ... state the reference level dB0 Level in decibels referred to a full scale sine wave in a sampled system So 0 dB0 is full scale dBu Level in decibels referred to a 0 775V rms sine wave with no external loading u unloaded The level of 0 775V is derived from the older dBm for which the reference level is 1mW of signal power into a 600Ω termination from an output with 600Ω source impedance dBV Level i...

Страница 63: ...justment trimmers 10 Reference In 3 pin XLR female 10 AES C Reference Digital Output 3 pin XLR male 10 AES A B Digital Outputs 3 pin XLR male 2 off 10 SDIF 2 CH1 CH2 Data BNC 2 off 10 SDIF 2 Clk In BNC 10 SDIF 2 Clk Out BNC 10 SPDIF Outputs RCA Phono Toslink optical 10 Remote In Out 9 pin D type male 2 off 11 Mains Supply 3 pin IEC CEE22 11 Additional Information 11 Digital Data Formats 11 Front P...

Страница 64: ...42 How Far will it Go 43 SPDIF 45 Message Handling 45 SDIF 2 46 PCM Format 46 SDIF 2 Messaging 47 Power Consumption 48 Size Weight and Operating Conditions 49 Size and Weight 49 Operating Conditions 49 General Technical Information 50 Word Length Reduction 50 What does it look like 52 Options 54 Mains Voltage 54 Video Frequency VCXOs 54 P3D DSD Pro and Other Formats 54 Ordering Options For A New U...

Страница 65: ...UK replace 44 with 0 web site www dcsltd co uk Periodic clicks occur in the recording 60 The unit fails to slave to a Master Clock 60 The Overload indicator will not go out 60 External meter does not show overload dCS 900 902 does 60 dCS Support 61 I wish 61 If You Need More Help 61 Other Information 61 Indexes and Software Version Numbers 62 Definitions of Units 62 Full Contents 63 Tables 66 Figu...

Страница 66: ... Figure 6 Six Channel Set Up Sync ed to Master Clock AES 25 Figure 7 Six Channel Set Up Sync ed to Word Clock 26 Figure 8 Six Channel Set Up Sync ed to Master Clock Word Clock 27 Figure 9 Multi unit Remote Daisy Chain 28 Figure 10 Recording Dual AES on a 4 Track Recorder 29 Figure 11 Word Clock and AES3 outputs 96 kS s 32 Figure 12 Word Clock and AES3 outputs 44 1 kS s 32 Figure 13 Word Clock in t...

Страница 67: ... length 9 13 D Display mode 15 Dither 50 Dither PDF 50 DSD 20 54 F Filter 30 Filter FIR 30 Filter IIR 30 Filter selection 20 Filter transient response 30 36 Fuse mains 56 57 G Gain 36 Generator level 3 20 Generator test 3 18 20 Generator tone 3 20 L LED mute 12 LED overload 14 60 LED overload level 13 LED word length 13 M Mode master 3 8 14 31 32 Mode slave 60 N Noise Shaping 9 13 16 36 O Overload...

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