Omicron CMGPS User manual

27
CMGPS
Synchronization Unit
Reference Manual

GPS Synchronization Unit CMGPS
2
Article number VESD0200 - Manual version: CMGPS.AE.6 - Year 2011
© OMICRON electronics. All rights reserved.
This manual is a publication of OMICRON electronics GmbH.
All rights including translation reserved. Reproduction of any kind, e.g., photocopying, microfilming,
optical character recognition and/or storage in electronic data processing systems, requires the explicit
consent of OMICRON electronics. Reprinting, wholly or in part, is not permitted.
The product information, specifications, and technical data embodied in this manual represent the
technical status at the time of writing and are subject to change without prior notice.
We have done our best to ensure that the information given in this manual is useful, accurate and
entirely reliable. However, OMICRON electronics does not assume responsibility for any inaccuracies
which may be present.
The user is responsible for every application that makes use of an OMICRON product.
OMICRON electronics translates this manual from the source language English into a number of other
languages. Any translation of this manual is done for local requirements, and in the event of a dispute
between the English and a non-English version, the English version of this manual shall govern.

Contents
3
Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1 Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.1 What is GPS? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.2 Purpose of the CMGPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3 Construction and Functioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 LED Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3.3 Connections and Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.3.1 DC in Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.3.2 Antenna Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.3.3 ext. Interf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.3.4 Pulse out 2 Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.3.5 Block Diagram of the CMGPS . . . . . . . . . . . . . . . . . . . . . . . . . .23
4 Operating the CMGPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.1 Connecting the CMGPS to a CMC Test Set . . . . . . . . . . . . . . . . . . . . . .26
4.2 Connecting the CMGPS to a CMC 56. . . . . . . . . . . . . . . . . . . . . . . . . . .27
5 Synchronizing Two or More CMC Test Sets . . . . . . . . . . . . . . . . . . . . . . . .29
5.1 Standard Accuracy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
5.2 Enhanced Accuracy Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5.3 Using CMGPS in Conjunction with CMIRIG-B . . . . . . . . . . . . . . . . . . . .32

GPS Synchronization Unit CMGPS
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6 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
6.1 CMGPS in General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
6.2 GPS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
6.3 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
6.4 Antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
6.5 ext. Interf.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
6.6 Pulse Out 2 Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6.7 CE Conformity, Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . .39
6.8 Insulation Coordination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
6.9 Safety Standards, Certificates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
7 Faults, Possible Causes, Remedies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
8 Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
8.1 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
8.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Contact Information / Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . .45
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

5
Preface
Preface
The purpose of this reference manual is to familiarize users with the CMGPS
synchronization unit and to show how to properly use it in various application
areas.
The reference manual contains important tips on how to use the CMGPS
synchronization unit safely, properly, and efficiently. Its purpose is to help you
avoid danger, repair costs, and down time as well as to help maintain the
reliability and life of the CMGPS synchronization unit.
This reference manual is to be supplemented by existing national safety
standards for accident prevention and environmental protection.
The reference manual should always be available at the sitewhere the CMGPS
synchronization unit is used. It should be read by all personnel operating the
synchronization unit.
Note: The OMICRON Test Universe software also installs a PDF version of this
reference manual. It can directly be opened by a mouse-click from the help
topic "User Manuals". The Test Universe Help can be launched by clicking Help
on the Start Page.
In addition to the reference manual and the applicable safety regulations in the
country and at the site of operation, the usual technical procedures for safe and
competent work should be heeded.
Note: This reference manual describes the CMGPS synchronization unit
hardware - that is, the physical device. In order to get familiar with the software
for controlling and configuring the CMGPS synchronization unit, please refer to
the software manuals and/or the OMICRON Test Universe Help.

GPS Synchronization Unit CMGPS
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Safety Requirements
Before operating the CMGPS, carefully read the following safety
instructions.
Only operate the CMGPS after you have read this manual and fully
understood the instructions herein.
The CMGPS may only be operated by trained personnel. Any
maloperation can result in damage to property or persons.
Principles, Designated Use
•TheCMGPS should only be used when in a technically sound condition. Its
use should be in accordance with the safety regulations for the specific job
siteandapplication.Always beaware ofthe dangersof thehigh voltagesand
currents associated with this equipment. Pay attention to the information
provided in the reference manual and the software documentation.
•TheCMGPS is exclusively intended for the application areas specified in
section1,"Designated Use"onpage9.Themanufacturer/distributorsarenot
liable for damage resulting from unintended usage. The user alone assumes
all responsibility and risk.
• The instructions provided in this reference manual and the associated
software manuals are considered part of the rules governing proper usage.
• Do not open the CMGPS or remove any of its housing components.
Orderly Practices and Procedures
• The reference manual (or its "electronic PDF pendant", which is installed to
your computer with the OMICRON Test Universe software) should always
be available on site where the CMGPS is used.
Note: The OMICRON Test Universe software also installs a PDF version of
this reference manual. It can directly be opened by a mouse-click from the
help topic "User Manuals". The Test Universe Help can be launched by
clicking Help on the Start Page.
• Personnel assigned to using the CMGPS must have read this reference
manual and fully understood the instructions herein.
• Do not carry out any modifications, extensions or adaptations at the
CMGPS.

7
Preface
Operator Qualifications
• Testing with the CMGPS should only be carried out by authorized and
qualified personnel.
• Personnel receiving training, instruction, direction, or education on the
CMGPS should remain under the constant supervision of an experienced
operator while working with the equipment.
Safe Operation Procedures
•TheCMGPS is to be set into operation in accordance with the information
provided in section 4 ”Operating the CMGPS”.
•TheCMGPS must not be opened! If the device is opened, no guarantee
claims can be made.
•Donot position the antenna of the CMGPS in an exposed location above
the lightning rod or in other locations endangered by lightning. Make
sure that the position of the lightning rod is higher than that of the antenna
in any case.
When installing the CMGPS, observe the general rules for lightning
protection complying with the industrial standard.
In addition to that, do not position the antenna within a control cabinet in
the vicinity of flashover-endangered spots.
•TheCMGPS must not be used in connection with devices with an
operating voltage that exceeds 250 V r.m.s. (for further details refer to
section 6.8 ”Insulation Coordination”).
• The electric equipment of the CMGPS is to be regularly checked. Any
fault such as loose connections or defective cables is to be immediately
repaired.
• If work has to be carried out on components connected to the mains
supply, a second person is required who presses, in case of emergency,
the emergency stop and/or the main push button with overvoltage
release.

GPS Synchronization Unit CMGPS
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9
Designated Use
1 Designated Use
The CMGPS is designed to either
• control one OMICRON CMC test set at a predetermined point in time
(triggering the starting point of a test process) or
• to synchronize the starting point of a test process of two or more
OMICRON CMC test sets.
by means of the GPS signal with world-wide reception.
The test set is controlled:
•viatheext. Interf. input1at the rear of the CMC test set
or
• via a binary input on the front of the CMC test set.
Using the CMGPS for other purposes than those described above is not
considered the designated use.
The CMGPS's specifications have been determined in the course of a project to
develop a mobile synchronization unit for CMC test sets. The CMGPS may not
be installed stationary.
Any other use of the CMGPS is only permitted after OMICRON electronics has
expressly agreed to it.
Observance of the operating instructions and compliance with the precautions
outlined therein is part of the defined use.
1. Refer also to section 3.3.3 ”ext. Interf.”.

GPS Synchronization Unit CMGPS
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11
Introduction
2 Introduction
2.1 What is GPS?
The Global Positioning System (GPS) is one of two satellite navigation systems
covering the whole earth. It was developed in 1978 by the US Department of
Defence to replace TRANSIT, the first US satellite navigation system, and was
initially designed to develop the defence ability of the USA.
The second system currently being used is the GLObal NAvigation Satellite
System (GLONASS), operated by Russia. The system was completed in 1995.
Technical Principles
GPS navigation is based on the principle of determining the distance between a
certain location on the earth to the NAVSTAR satellites revolving around the
earth on six different orbits twice a day. Their orientation in relation to the
equator is approx. 55 °.
Figure 2-1:
The NAVSTAR
satellites on their orbits
The satellites are continuously sending encoded position and time information
in a frequency range of approx. 1500 MHz.
Special GPS receivers (passive receivers) receive these signals and determine
their exact position in the system of earth co-ordinates by means of the signal
code as well as measurement of the time span between receiving the signals.
At the same time, the GPS receiver’s clock is synchronized to the atomic clocks
aboard the GPS satellites.

GPS Synchronization Unit CMGPS
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2.2 Purpose of the CMGPS
CMGPS is a system extension which allows for controlling (triggering) a CMC
test set at a precisely defined moment via the GPS1satellite signal with world-
wide reception (see also section ”Technical Principles”).
Based on this innovative test method by using two or more CMGPS extension
units, two or more CMC test sets can be started simultaneously with a
synchronization error of the CMGPS output of < 1 µs2. There may be any
distance between these test sets to be synchronized (see also
section 5 ”Synchronizing Two or More CMC Test Sets”).
By utilizing the GPS signal it is thus possible to ensure identical trigger time of
test processes of several independently operating test units, regardless of the
distance between them.
Figure 2-2:
CMGPS connected to
CMC 356 test set
1. Global Positioning System
2. Depends on the accuracy set by means of the software (please also refer to chapter
5.1 ”Standard Accuracy Mode”).
Antenna
ext. Interf.
ext. Interf.
CMC 356 Pulse out 2
Power supply unit

13
Construction and Functioning
3 Construction and Functioning
3.1 Components
The CMGPS consists of the following components:
Figure 3-1:
Synchronization unit
CMGPS
Figure 3-2:
Power supply unit
100 - 240 VAC/18 VDC
incl. plug-in adapter for
country-specific wall
outlets
Article number VEHZ3000
Article number VEHZ1103

GPS Synchronization Unit CMGPS
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Figure 3-3:
Connection cable
CMGPS ext. Interf. ⇔
CMC test set
Figure 3-4:
Active antenna
Article number VEHK0003
Article number VEHZ3001

15
Construction and Functioning
Figure 3-5:
15 m (50 ft) RG58
coaxial cable with SMA
connector (extension
cable for antenna)
For cases that may require anextension of the antenna cable, an optional set of
2 × 20 m (2 x 60 ft) cables is available from OMICRON.
Figure 3-6:
CMGPS connected to
antenna via 2 × 20 m
(2 x 60 ft) extension
cables.
Note: when connecting
VEHZ3003, VEHK3002
shown in figure 3-5
cannot be used
anymore.
Article number VEHK3002
Antenna CMGPS
2 extension cables + SMA adapter (see also figure 3-7).
Article number VEHZ3003

GPS Synchronization Unit CMGPS
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Figure 3-7:
SMAadaptertoconnect
the extension cables to
CMGPS and antenna
• Protecting cap for antenna input (no illustration)
• Carrying bag for CMGPS (no illustration)
• User manual (no illustration)
Connect to antenna Connect to CMGPS
Extension cables

17
Construction and Functioning
3.2 LED Status Display
1. The power supply is applied to the CMGPS
2. After the initialization of the CMGPS
Typically, after a time period of max. 5 minutes this status is succeeded by the
condition "CMGPS ready for operation" (refer to the following item)1. If this
should not be the case, refer to section 7 ”Faults, Possible Causes, Remedies”.
3. CMGPS is ready for operation
1. This time may increase to up to 20 minutes in cases where the CMGPS was either relocated by
several hundred kilometers since the last time it was in use or out of operation for more than
6months.
On
Pulse
Searching
Locked
All 3 LEDs are lit for about 30 seconds; the GPS
receiver is initialized.
On
Pulse
Searching
Locked
LED "ON" is lit.
LED "Searching/Locked" flashes. The receiver does
not yet receive enough strong satellite signals in
order to put out the synchronization pulse.

On
Pulse
Searching
Locked
LED "ON" is lit.
LED "Searching/Locked" is lit. The receiver acquires
the necessary number of satellite signals of sufficient
strength and can therefore put out the
synchronization pulse with the unit accuracy.

GPS Synchronization Unit CMGPS
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Synchronization pulse
Other LED conditions as those described above indicate faults and are outlined
in section 7 ”Faults, Possible Causes, Remedies” on page 41.
On
Pulse
Searching
Locked
LED "ON" is lit.
LED "Searching/Locked" is lit.
LED "Pulse" is lit for approx. 500 ms during the
output of the synchronization pulse at the outputs
Pulse out 1 and/or Pulse out 2.

19
Construction and Functioning
3.3 Connections and Interfaces
3.3.1 DC in Power Supply
Power supply is applied to the CMGPS by means of a power supply unit
100-240 VAC/18 VDC, which is equipped with an adapter for the various
country-specific wall outlets (see figure 3-2 on page 13).
The connector of this power supply unit is reverse polarity protected.
Figure 3-8:
Power supply input
DC in
Most of the up-to-date CMC test sets (e.g., CMC 256, CMC 256plus, CMC 353,
CMC 356 or CMC 850) provide power supply to the CMGPS via the connection
cable to the ext. Interf.. Therefore, in conjunction with oneof these test sets, the
power supply unit is not needed.
InconjunctionwiththeCMIRIG-B interfaceunit,use theabovementionedpower
supply unit to power the CMGPS.
Notethat usingsuch aseparate powersupply unitkeeps theCMGPS in"locked"
mode when the CMC test set is switched off.

GPS Synchronization Unit CMGPS
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3.3.2 Antenna Input
CMGPS uses an active antenna (see figure 3-4 on page 14).
Figure 3-9:
Antenna input of the
CMGPS
The antenna is connected to the antenna input of the CMGPS (SMA socket) by
means of the RG58 coaxial extension cable (see figure 3-5 on page 15).
This extension cable also serves as power supply cable for the antenna of the
CMGPS.
Note: The coaxial extension cable supplied with CMGPS has a length of 15 m
(45 ft.) If that is not sufficient, there is an optional extension set of 2 × 20 m
(2 × 60 ft.) with SMA adapters available for a total extension of 40 m (120 ft.).
Refer to figure 3-6 on page 15 for a view. For ordering information please refer
to table 8-1 on page 43.
When applyingtheoptional 2 × 20 m (2 × 60 ft.)extension set, the original15 m
(45 ft.) extension cable cannot be used anymore.
Antenna input