DRAWMER
M-Clock Lite
DMS-4
AES GRADE 1 MASTER CLOCK
Warranty
Safety Consideration
Radio Frequencies Statement
Chapter 1 - Introduction
Introduction
Installation
Audio Connections & Guide
Chapter 2 - General Information
If a fault develops
Contacting Drawmer
Specification
Block Diagram
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CONTENTS
COPYRIGHT
This manual is copyrighted © 2008 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
into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, without the written permission of Drawmer Electronics Ltd.
ONE YEAR LIMITED WARRANTY
Drawmer Electronics Ltd., warrants the Drawmer DMS-4
M-Clock Lite, AES Grade 1 Master Clock to conform
substantially to the specifications of this manual for a period
of one year from the original date of 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,
repair or replace the product without charge, or, if not
possible, to refund the purchase price to you. This warranty
is not transferable. It applies only to the original purchaser
of the product.
For warranty service please call your local Drawmer dealer.
Alternatively call Drawmer Electronics Ltd. at +44 (0)1709
527574. 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 letters in a prominent position
on the shipping box. Enclose your name, address,
telephone number, copy of the original sales invoice and a
detailed description of the problem. Drawmer will not accept
responsibility for loss or damage during transit.
This warranty is void if the product has been damaged by
misuse, modification or unauthorised repair.
THIS WARRANTY IS IN LIEU OF ALL WARRANTIES,
WHETHER ORAL OR WRITTEN, EXPRESSED, IMPLIED
OR STATUTORY. DRAWMER MAKES NO OTHER
WARRANTY EITHER EXPRESS OR IMPLIED,
INCLUDING, WITHOUT LIMITATION, ANY IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR
A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
PURCHASER’S SOLE AND EXCLUSIVE REMEDY
UNDER THIS WARRANTY SHALL BE REPAIR OR
REPLACEMENT AS SPECIFIED HEREIN.
IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING FROM ANY DEFECT IN THE PRODUCT,
INCLUDING LOST PROFITS, DAMAGE TO PROPERTY,
AND, TO THE EXTENT PERMITTED BY LAW, 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
exclusion of implied warranties or limitations on how long
an implied warranty may last, so the above limitations may
not apply to you. This warranty gives you specific legal
rights. You may have additional rights that vary from state
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.
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DRAWMER
M-Clock Lite
DMS-4
AES GRADE 1
MASTER CLOCK
SAFETY CONSIDERATIONS
CAUTION - MAINS FUSE
TO REDUCE THE RISK OF FIRE
REPLACE THE MAINS FUSE ONLY WITH
A FUSE THAT CONFORMS TO IEC127-2.
250 VOLT WORKING, TIME DELAY TYPE
AND BODY SIZE OF 20mm x 5mm.
THE MAINS INPUT FUSE MUST
BE RATED AT T315mA.
For the USA
FEDERAL COMMUNICATIONS COMMISSION RADIO
FREQUENCY INTERFERENCE STATEMENT
This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there
is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference
to radio or television reception, which can be determined
by turning the equipment off an on, then the user is encouraged to try to correct the interference by one or more
of the following measures:
Re-orient or relocate the receiving antenna.
Increase the separation between the equipment and
the receiver.
CAUTION - MAINS CABLE
DO NOT ATTEMPT TO CHANGE
OR TAMPER WITH THE
SUPPLIED MAINS CABLE.
CAUTION - SERVICING
DO NOT PERFORM ANY SERVICING.
REFER ALL SERVICING TO QUALIFIED
SERVICE PERSONNEL.
WARNING
TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK DO NOT EXPOSE
THIS EQUIPMENT TO RAIN OR MOISTURE.
Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV
technician for help.
Unauthorised changes or modification to this system can
void the users’ authority to operate this equipment.
This equipment requires shielded interface cables in order
to meet FCC class B limit.
For Canada
CLASS B NOTICE
This digital apparatus does not exceed the Class B limits
for radio noise emissions set out in the Radio Interference
Regulations of the Canadian Department of Communications.
CLASSE B AVIS
Cet appareil numérique ne dépasse pas les limites de la
classe B au niveau des émissions de bruits radioélectriques
fixés dans le Règlement des signaux parasites par le
ministère Canadien des Communications.
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DRAWMER DMS-4
M-Clock Lite
AES GRADE 1 MASTER CLOCK
INTRODUCTION
It is now widely accepted that one of the essential requirements for high quality
digital recording is a first class, high stability master clock generator. These
can be complicated devices with many added features, which although useful,
may be surplus to requirements. The aim of M-Clock Lite is to provide a simple,
high quality clock generator, which is forward compatible with high speed clocks
predicted for the future. M-Clock Lite features an AES Grade 1 master clock
generator, meaning that the generated clock has a long term frequency accuracy
of +/- 1ppm.
Features:
M-Clock Lite offers clock rates of 44.1, 48, 88.2, 96, 176.4, 192, 352.8 and
384kHz at extremely low jitter.
CHAPTER 1
An external clock input allows the user to select an alternative clock source
without having to re-route clock cables.
10 Outputs are provided, 8 at the rear and 2 for easy access on the front panel.
1 3
1
Wordclock Outputs:
Two wordclock outputs conveniently
located on the front panel.
2
On Led:
A power LED notifies that the unit is on.
2
3
Output Sample Rate:
Two buttons toggle through the wordclock output sample rates, setting the rate for
the eight rear panel outputs 5 and the two front panel outputs 1 from 44.1kHz to
384kHz. An EXTernal wordclock input can also be selected that sets the clock output
rate to match that of the incoming external clock 4 .
5 4
4
Wordclock Inputs:
Sets the output sample rate when the Output Sample Rate
control 3 is set to EXT.
4
5
Wordclock Outputs:
In addition to the two front panel wordclock outputs eight more
are found on the rear.
INSTALLATION
The DMS-4 is designed for standard 19" rack mounting and occupies 1U of rack 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’.
Use fibre or plastic washers to prevent the front panel becoming marked by the mounting bolts.
The unit will be supplied with a power cable suitable for domestic power outlets in your country. For your own 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-4 M-Clock Lite operates from mains voltages between 85
to 250v, eliminating the need to make any changes when touring and allowing the unit to remain fully operational during
large fluctuations in the mains power supply.
The DMS-4 is fitted with a mains fuse that conforms to the IEC127-2
standard and is rated at T315mA. If the fuse blows it must be replaced
with one of identical type and value. To do so remove the mains cable
from the IEC connector and open the drawer that is located just
below, replace the fuse, close the drawer and re-attach the mains
cable.
Fuse
AUDIO CONNECTIONS
Word Clock
Use only good quality 75Ω digital or video coax (not aerial downlead) cable for the word-clock signals, terminated with
the correct type of 75Ω BNC 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!
SIMPLE WORDCLOCK DISTRIBUTION SETUP
5
CHAPTER 2
M-CLOCK Lite DMS-4 GENERAL INFORMATION
IF A FAULT DEVELOPS
For warranty service please call Drawmer Electronics Ltd. or
their nearest authorised service facility, giving full details of
the 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.
For service claims under the warranty agreement a service
Returns Authorisation (RA) number will be issued.
Write this RA number in large letters in a prominent position
on the shipping box. Enclose your name, address, telephone
number, copy of the original sales invoice and a detailed
description of the problem.
Authorised returns should be prepaid and must be insured.
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 substantial shock-proof
material, capable of withstanding the handling for the transit.
SPECIFICATION
Internal Clock Generator
2 x Temperature Compensated Xtal Oscillators (TCXOs)
AES11 GRADE 1 Stability, +/-1ppm (0-60 Celcius),
Tolerance <<+/-1ppm (15-30
Celcius)
Phase noise -130 dBc/Hz @ 1kHz
@ 24.5760 MHz to give Fs 48 kHz, 96 kHz,
192kHz & 384 kHz
@ 22.5792 MHz to give Fs 44.1 kHz, 88.2 kHz,
176.4 kHz & 352.8 kHz
Word Clock Inputs
1 x BNC (Rear Panel)
Input Impedance 75 Ohms
Word Clock Outputs
8 x BNC (Rear Panel)
2 x BNC (Front Panel)
Output impedance 33 ohms
CONTACTING DRAWMER
Drawmer Electronics Ltd., will be pleased to answer all
application questions to enhance your usage of this
equipment. Please address correspondence to:
Drawmer (Technical Help line)
Coleman Street
Parkgate
Rotherham
S62 6EL
UK
Alternatively contact us by E-mail on :
tech@drawmer.com
Further information on all Drawmer dealers, Authorised service
departments and other contact information can be obtained
from our web pages on:
All outputs selectable between 44.1, 48, 88.2, 96, 176.4,
192, 352.8 and 384kHz
General
Power Supply: Internal, Universal Input, 15 W
Fuse Rating T315mA for All voltages.
CONFORMING TO: IEC127-2
Fuse Type 20mm x 5mm, Class 3 Slow - Blow
250Volt working
Dimensions: 1u, 19" Rack Mount,
482mm(W) x 44mm(H) x 145mm(D)
Weight 1.755 kg
http://www.drawmer.com
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BLOCK DIAGRAM
Ref:1v01 A 11-02-08
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