Drawmer D-Clock DMS-2 User manual

DRAWMER
D-Clock
DMS-2
WORD CLOCK MEASUREMENT
AND DISTRIBUTION AMPLIFIER
CONTENTS
Warranty
Safety Consideration
RadioFrequenciesStatement
Chapter 1 - Introduction
Introduction
FeaturesOverlay
Installation
PowerConnection
Chapter 2 - Control Description
SimpleConnectionGuide
AudioConnections
ControlDescription
TypicalConnection Setup
ConnectionSetupfor ProductswithNo Clock Output
Chapter 3 - DMS-2 General Information
Ifafaultdevelops
Contacting Drawmer
Specification
Block Diagram
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2
Drawmer Electronics Ltd., warrants the Drawmer DMS-2
D-Clockword-clockmeasurementanddistributionamplifier
toconform substantially tothespecifications of thismanual
fora periodofone yearfromthe original dateof purchase
when used in accordance with the specifications detailed
in this manual. In the case of a valid warranty claim, your
sole and exclusive remedy and Drawmer’s entire liability
under any theory of liability will be to, at Drawmer’s
discretion,repairorreplace the productwithoutcharge,or,
if not possible, to refund the purchase price to you. This
warranty is not transferable. It applies only to the original
purchaserof theproduct.
ForwarrantyservicepleasecallyourlocalDrawmer dealer.
AlternativelyyoucancallDrawmerElectronicsLtd. directly
at [phone]. Then ship the defective product,
with transportation and insurance charges pre-paid, to
Drawmer Electronics Ltd., Coleman Street, Parkgate,
Rotherham, S62 6EL UK. Write the RA number in large
lettersina prominent positionontheshippingbox. Enclose
yourname,address,telephonenumber,copyofthe original
sales invoice and a detailed description of the problem.
Drawmerwill notaccept responsibilityfor lossor damage
during transit.
Thiswarranty isvoid ifthe producthas beendamaged by
misuse,modification orunauthorised repair.
THIS WARRANTY IS IN LIEU OF ALL WARRANTIES,
WHETHERORALORWRITTEN,EXPRESSED,IMPLIED
OR STATUTORY. DRAWMER MAKES NO OTHER
WARRANTY EITHER EXPRESS OR IMPLIED,
INCLUDING, WITHOUT LIMITATION, ANY IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR
APARTICULAR PURPOSE, ORNON-INFRINGEMENT.
PURCHASER’S SOLE AND EXCLUSIVE REMEDY
UNDER THIS WARRANTY SHALL BE REPAIR OR
REPLACEMENTASSPECIFIED HEREIN.
INNOEVENTWILLDRAWMERELECTRONICSLTD.BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING FROM ANY DEFECT IN THE PRODUCT,
INCLUDINGLOST PROFITS,DAMAGETO PROPERTY,
AND,TOTHEEXTENT PERMITTEDBYLAW,DAMAGE
FOR PERSONAL INJURY, EVEN IF DRAWMER HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
Some states and specific countries do not allow the
exclusionof impliedwarranties or limitationson howlong
animpliedwarranty maylast,sothe abovelimitationsmay
not apply to you. This warranty gives you specific legal
rights. Youmay have additionalrightsthat vary fromstate
to state, and country to country.
In the interests of product development, Drawmer reserve the right to modify or
improve specifications of this product at any time, without prior notice.
ONE YEAR LIMITED WARRANTY
COPYRIGHT
This manual is copyrighted 82004 by Drawmer Electronics Ltd. With all rights reserved. Under copyright
laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated
intoanylanguageinany form by any means,mechanical,optical,electronic, recording, or otherwise, with-
out the written permission of Drawmer Electronics Ltd.

3
For the USA
FEDERALCOMMUNICATIONSCOMMISSIONRADIO
FREQUENCYINTERFERENCESTATEMENT
Thisequipment hasbeen testedand foundto complywith
the limits for a Class B digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonableprotectionagainstharmfulinterferenceinaresi-
dential installation. This equipment generates, uses and
canradiateradiofrequencyenergy and,ifnotinstalledand
usedin accordancewiththe instructions,maycause harm-
fulinterference toradio communications.However, there
isno guarantee thatinterferencewill not occurina particu-
lar installation. If this equipment does cause interference
to radio or television reception, which can be determined
by turning the equipment off and on, then the user is en-
couraged to try to correct the interference by one or more
ofthefollowing measures:
Re-orientorrelocatethereceiving antenna.
Increasethe separation betweentheequipment and
thereceiver.
Connect the equipment into an outlet on a circuit
differentfromthattowhichthereceiverisconnected.
Consultthe dealeroran experiencedradio/TV
technicianfor help.
Unauthorised changes or modification to this system can
voidthe users’authority tooperate thisequipment.
Thisequipment requiresshieldedinterface cablesin order
to meet FCC class B limit.
ForCanada
CLASS B NOTICE
This digital apparatus does not exceed the Class B limits
forradio noiseemissionsset outinthe RadioInterference
Regulationsof theCanadianDepartment ofCommunica-
tions.
CLASSE B AVIS
Cet appareil numérique ne dépasse pas les limites de la
classeBauniveaudesémissionsdebruitsradioélectriques
fixés dans le Règlement des signaux parasites par le
ministèreCanadiendes Communications.
DRAWMER
D-Clock
DMS-2
WORDCLOCKMEASUREMENT
AND DISTRIBUTION AMPLIFIER
SAFETY CONSIDERATIONS
CAUTION-MAINSFUSE
TO REDUCE THE RISK OF FIRE
REPLACETHEMAINSFUSE ONLY WITH
A FUSE THAT CONFORMS TO IEC127-2.
250VOLTWORKING,TIMEDELAY TYPE
AND BODY SIZE OF 20mm x 5mm.
THEMAINS INPUTFUSE MUST
BE RATED AT T315mA.
CAUTION-MAINSCABLE
DO NOT ATTEMPT TO CHANGE
OR TAMPER WITH THE
SUPPLIEDMAINS CABLE.
CAUTION-SERVICING
DO NOT PERFORM ANY SERVICING.
REFERALLSERVICING TO QUALIFIED
SERVICE PERSONNEL.
WARNING
TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THISEQUIPMENTTORAIN OR MOISTURE.

4
DRAWMER
DMS-2
D-ClockD-Clock
WORD CLOCK MEASUREMENT
AND DISTRIBUTION AMPLIFIER
Digital audio facilities often require a number of clock
sources, which are used to synchronise outboard proc-
essors to the system clock rate using external clock in-
puts. The Drawmer D-CLock is a dual input, twenty out-
put word clock distributor with a 16 character blue LCD
displayproviding a highaccuracyreference measurement
ofthe incomingsamplerate. It usesahigh stabilityTCXO
(temperature compensated xtal oscillator) along with a
microcontroller to measure the incoming sample rate to
anaccuracy of2ppmand displaystheinformation inthree
differentformats, actualfrequency(to onedecimal place),
nominalfrequency+/-ppmerror,ornominalfrequency plus
percentage of pull up or pull down.
It has both AES/EBU and BNC word clock inputs featur-
inga zerolatency loopthroughoutput withswitchable high
impedance to maintain the correct level of the digital sig-
nal for onward distribution. Sixteen BNC clock outputs
are situated on the rear panel with a further four BNC
clockoutputs onthefront panel forquickpatching toother
digital devices.
CHAPTER 1
The wordclock outputs can be fed from the wordclock in-
put at any sample rate between 32KHz and 768KHz or
derived from an AES11 input or stripped from an AES3
audio signal at any sample rate between 32KHz and
192KHz.Usingan audiosignaltoprovide theclockmeans
even products without a wordclock output such as some
analogue to digital converters, or one of the many mic
pre’s with internal A/D conversion but no word clock out-
put, can be the master wordclock source for the whole
digital studio.
INTRODUCTION
2 in/20 out Clock Measurement and
Distribution Amplifier
Inputs:BNCwithzerolatencyloopthrough
AESwithwithzerolatencyloopthrough
Outputs: BNC loopthrough / AES
loopthrough 20 BNC clock outputs - 33
Ohmsimpedance
3 sample rate measurement LCD modes
accurateto2ppm
Universal voltage filtered mains power
input
•
•
•
•
•

5
4x Front Panel Outputs:
4xBNCoutputconnectorsmounted
onthefrontforeaseof connectivity.
1 2 3 4 5
1112 10 8
1Display:
Blue/White liquid crystal display
with three switchable modes of
operation.
2Display Mode:
Switch to control the mode of
display 2.
3
Input Source Select:
Selects either the AES orBNC rear
panel input source.
4Clock Present LED’s:
Twoled’sshowing theLockedstaus
of theAES andBNC inputs.
5
1x BNC Clock Input:
Input is selected using 4
61x BNC Clock Through:
BNC output with zero latency
loopthroughfromBNC input.
7BNCTermination Sensitivity:
Switch to alter the BNC termination
sensitivitybetween75Ohmsand Hi
Z. This must be switched to Hi Z
whenusingLoopThrough.
8
AES Termination Sensitivity:
Switch to alter the AES termination
sensitivity between 110 Ohms and
Hi Z. This must be switched to Hi Z
whenusingLoopThrough.
91x AES Input:
Input is selected using 4
10 1x AES Through:
AES output with zero latency
loopthroughfrom AESinput.
11
12
6
9 7
16x BNC Clock Outputs:
BufferedBNCwordclockoutputswith
33 Ohms impedance.
FEATURES OVERLAY
The DMS-2 D-Clock is designed for standard 19" rack
mountingand occupies1U ofrack space.Avoid mounting
the unit directly above power amplifiers or power supplies
that radiate significant amounts of heat.
If the unit is to be used in a mobile situation, it is strongly
recommended that the rear of the unit is supported
in the carrying rack to avoid bending the front panel rack
mounting ‘ears’.
Always connect the mains earth to the unit. Use fibre or
plasticwasherstopreventthefrontpanelbecomingmarked
by the mounting bolts.
INSTALLATION
The unit will be supplied with a power cable suitable for
domesticpoweroutletsinyourcountry.Foryourown safety
it is important that you use this cable. The unit should
always be connected to the mains supply earth using this
cable.
Powered by a universal switch mode power supply, the
DMS-2 D-Clock operates from mains voltages between
85- 250v, eliminatingtheneed to makeanychanges when
touring and allowing the unit to remain fully operational
during large fluctuations in the mains power supply.
POWER CONNECTION

6
SIMPLE CONNECTION GUIDE
CHAPTER 2
AES11
IsviaanXLRconnector designed tobeusedwithstandard
balancedmicrophone cable(20metres maximum),wired
pin1 screen,pin2 and 3balanceddata, andtheXLR shell
connectedtothechassis. Having manyshortcablesjoined
together is not advisable as each connector can cause
undesirablesignalreflections.
Theoutput socketfullyconforms totheEMC standards;if
the unit is to be used where it may be exposed to high
levelsof disturbance,such asfound close toa TVor radio
transmitter,it is suggestedthatthe screen ofthedata cable
be connected to the chassis connection on the XLR type
connector rather than to pin 1.
Ifgroundloopproblemsareencountered,neverdisconnect
themainsground,butinstead,trydisconnectingthesignal
screen on one end of each cable connecting the outputs.
Word Clock
Useonly goodquality 750digital orvideo coax(not aerial
downlead)cableforthe word-clocksignals,terminatedwith
the correct type of 75ΩBNC connectors - inferior cables
will introduce jitter and will completely undermine the
performance benefits which might be achieved by using a
master clock in the first place!
AUDIO CONNECTIONS

7
CONTROL DESCRIPTION
DISPLAY A Blue/White LCD display wth three switchable modes of operation:FREQ, ±PPM and±%.
The mode that is displayed during power down is saved for the next session.
The display accuracy is 2ppm at all sample rates up to 768kHz, or 0.1Hz increments @
48KHz sample rate
MODE A switch controls the mode of display enabling you to read the incoming sample rate in your
preferred manner. Pressing the switch toggles through the three modes ofFREQ, ±PPM and
±%, with led indication.
FREQ
Displays the actual frequency to four decimal
places upto >768kHz.
±PPM
Displays the nominal sample rate with +/- ppm
(partper million)errorindication for32,44.1, 48,
96 & 192KHz
±%
Displaysthe nominalsampleratewithpercentage
pull up/down indication for 32, 44.1, 48, 96 &
192KHz
INPUTSOURCE CLOCKPRESENT
Sets the input source
to be used - either AES
or BNC as connected
on the rear panel - with
ledindication.
The two LED’s indicate the status of the input
sources. When a led is lit continously a strong
signalis beingrecieved bythat inputsource and
the D-Clock is “locked on”. If a led flickers, the
signal for that particular input source is weak or
unstable - in this case the source of this weak
signalshould belocated andimproved.

8
CONNECTION SETUP FOR PRODUCTS WITH
NO CLOCK OUTPUT
TYPICAL CONNECTION SETUP

9
IF A FAULT DEVELOPS
Forwarranty servicepleasecall DrawmerElectronics Ltd.
ortheirnearestauthorised service facility,givingfulldetails
ofthe difficulty.
A list of all main dealers can be found on the Drawmer
webpages.
On receipt of this information, service or shipping
instructions will be forwarded to you.
No equipment should be returned under the warranty
without prior consent from Drawmer or their authorised
representative.
Forserviceclaimsunder the warrantyagreementaservice
Returns Authorisation (RA) number will be issued.
WritethisRAnumberinlargelettersinaprominent position
on the shipping box. Enclose your name, address,
telephonenumber, copyofthe originalsalesinvoice anda
detaileddescription ofthe problem.
Authorisedreturns shouldbe prepaid andmust beinsured.
All Drawmer products are packaged in specially designed
containers for protection. If the unit is to be returned, the
original container must be used. If this container is not
available, then the equipment should be packaged in
substantialshock-proof material,capable ofwithstanding
the handling for the transit.
CONTACTINGDRAWMER
DrawmerElectronicsLtd., willbepleasedto answer all
application questions to enhance your usage of this
equipment.Pleaseaddresscorrespondenceto:
Drawmer(TechnicalHelpline)
ColemanStreet
Parkgate
Rotherham
S62 6EL
UK
Alternatively contact us by E-mail on :
[email protected]
Further information on all Drawmer dealers, Authorised
servicedepartmentsand othercontactinformationcan be
obtainedfrom ourweb pageson:
http://www.drawmer.com
D-Clock DMS-2 GENERAL INFORMATION
CHAPTER 3
INPUTS
BNCwordclockinput switchable75ohm/hiztermination
Sensitivity
AES sync input switchable110ohm/hiztermination
Sensitivity 120mV
LOOPTHROUGHOUTPUTS
BNCOutput withzerolatencyloopthrough
frominputBNC
AESOutput withzerolatencyloopthrough
fromAESinput
MAINOUTPUTS
BNCwordclockoutputs 20xsimultaneousre-bufferedBNC
wordclockoutputswith33ohm
outputimpedance.
4 of which are on the front panel
forease ofconnectivity.
DISPLAY
Blue/white LCD display wth three switchable modes of
operation with mode led indicators for each:
frequency actualfrequency up to>768KHz
+/- ppm nominalsampleratewith+/- ppm
errorindicationfor 32,44.1,48,96
& 192KHz
+/-% Nominalsample ratewith
percent pull up/down indication
for 32,44.1,48,96 & 192KHz
Accuracy 2ppm at all sample rates up to
768KHz
0.1 Hz increments @ 48KHz
sample rate
INDICATORS
AES/wordclock source select led indicators
AES/wordclock clock present led indicators
GENERAL
PowerSupply: Internal,Universal Input, 10W
PowerRequirement <6W
FuseRating T315mAforAll voltages.
CONFORMINGTO:
IEC127-2
FuseType 20mm x 5mm, Class 3 Slow -
Blow. 250Volt working
Dimensions: 1u, 19" Rack Mount, Depth
145 mm
Weight 1.7 kg
SPECIFICATION

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BLOCK DIAGRAM
Ref:1v00 B 08-06-04