Omicron CMC 850 User manual

CMC 850
User Manual

CMC 850 User Manual
2
Manual Version: ENU 1015 05 03 - Year: 2020
© 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. Subject to change without notice.
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.
Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the
United States and/or other countries.

Table of Contents
3
Table of Contents
1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1 Rules for Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.2 Orderly Practices and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.3 Operator Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.4 Safe Operation Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.5 Compliance Statements and Recycling. . . . . . . . . . . . . . . . . . . . . . . . .7
2.6 Information for Disposal and Recycling. . . . . . . . . . . . . . . . . . . . . . . . .7
3 Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4 Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4.1 Interfaces to the Test Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4.2 Operating CMC 850 with a controlling test software . . . . . . . . . . . . . . .8
4.3 Time Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4.4 Web Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5 Connections and Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5.1 Power Socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5.2 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5.2.1 ETH1 and ETH2 Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5.2.2 USB Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.2.3 ! Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.2.4 Associate Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5.2.5 Status LED A, B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5.3 Ethernet / Network Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5.4 External Interface (“ext. Interf.”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5.5 LL out 1 - 6 and LL out 7 - 12 (Low Level Outputs). . . . . . . . . . . . . . .15

CMC 850 User Manual
4
6 Setup and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Installing the test software and connecting the computer to
the CMC 850 test set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Configuring network settings and accessing Web Interface
via Ethernet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Using a CMIRIG-B interface unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1 External Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2 Low Level Outputs “LL out 1 - 6” and “LL out 7 - 12” . . . . . . . . . . . . . 18
7.3 Low Level Binary Outputs “ext. Interf.” . . . . . . . . . . . . . . . . . . . . . . . . 19
7.4 Technical Data of the Communication Ports. . . . . . . . . . . . . . . . . . . . 20
7.4.1 The NET-2 Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.4.2 The NET-1C Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.4.3 The NET-1B Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.5 IEC 61850 GOOSE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.6 IEC 61850 Sampled Values (Publishing) . . . . . . . . . . . . . . . . . . . . . . 22
7.7 Time Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.8 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.9 Shock and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.10 Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.11 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.12 Safety Standards, Electromagnetic Compatibility, Certificates . . . . . . 24
8 Software License Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5
Preface
1 Preface
The purpose of this manual is to familiarize users with the CMC 850 test set and to show how to
properly use it in various application areas. The manual contains important tips on how to use
CMC 850 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 CMC 850.
This manual is to be supplemented by existing national safety standards for accident prevention and
environmental protection. Keep it available at the site where CMC 850 is used. It should be read by all
personnel operating the test set. In addition to the manual and the applicable safety regulations in the
country and at the site of operation, heed the usual technical procedures for safe and competent work.
This manual describes the CMC 850 hardware - that is, the physical test set. In order to get
familiar with the software for controlling and configuring CMC 850, please refer to the
Test Universe, RelaySimTest and/or the Web Interface Help and their accompanying software
manuals.
2 Safety Instructions
Before operating the CMC 850 test set, carefully read the following safety instructions. Only operate
(or even turn on) CMC 850 after you have read this manual and fully understood the instructions
herein.
CMC 850 may only be operated by trained personnel. Any maloperation can result in damage to
property or persons.
2.1 Rules for Use
•CMC 850 should only be used when in a technically sound condition. Its use should be in
accordance with the safety regulations for the specific job site and application. Always be aware of
the dangers of the high voltages and currents associated with this equipment. Pay attention to the
information provided in the manual and the software documentation.
•CMC 850 is exclusively intended for the application areas specified in section 3 "Designated Use".
The manufacturer/distributors are not liable for damage resulting from unintended usage. The user
alone assumes all responsibility and risk.
• The instructions provided in this manual and the associated software manuals are considered part
of the rules governing proper usage.
• Do not open CMC 850 or remove any of its housing components.
2.2 Orderly Practices and Procedures
• Keep this manual available on site where CMC 850 is used, either in electronic form as PDF or
printed-out.
• Personnel assigned to using CMC 850 must have read this manual and fully understood the
instructions herein.
• Do not carry out any modifications, extensions or adaptations at CMC 850.

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CMC 850 User Manual
2.3 Operator Qualifications
• Testing with CMC 850 should only be carried out by authorized and qualified personnel.
• Personnel receiving training, instruction, direction, or education on CMC 850 should remain under
the constant supervision of an experienced operator while working with the equipment.
2.4 Safe Operation Procedures
• Follow the instructions in section 6 "Setup and Operation" that describes how to set CMC 850 into
operation.
• Do not use any other power supply unit for CMC 850 than the one provided by OMICRON.
• Do not block the access to safety-relevant test set components like the main power switch or the
power cord. In cases of an emergency, these components need free and quick access.
• Before connecting and disconnecting test objects, verify that all outputs have been turned off.
Never connect or disconnect a test object while the outputs are active.
• When disconnecting power supply cables or test leads, always start from the device feeding the
power or signal.
• Do not operate CMC 850 under wet or moist conditions (condensation).
• Do not operate CMC 850 when explosive gas or vapors are present.
•If CMC 850 is opened by unauthorized personnel, all guarantees are invalidated.
• Connect the CMC 850 low level outputs LL out 1-6, LL out 7-12 and “external Interface” only to
external devices that meet the requirements for low level equipment according to EN 60950 or
IEC 60950.
• Connect ETH1 and ETH2 only to Ethernet ports. Do not connect them to telephone plugs.
•If CMC 850 seems to be functioning improperly, please contact the OMICRON Technical Support
(→ page 27).

7
Safety Instructions
2.5 Compliance Statements and Recycling
CMC 850 is designated in the following statements as “product”, “equipment”, or “apparatus”.
Declaration of Conformity (EU)
The product adheres to the specifications of the guidelines of the council of the European Community
for meeting the requirements of the member states regarding the electromagnetic compatibility (EMC)
Directive 2014/30/EU, the low voltage Directive 2014/35/EU, and the RoHS Directive 2011/65/EU.
FCC Compliance (USA)
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
Declaration of Compliance (Canada)
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de le classe A est comforme à la norme NMB-003 du Canada.
2.6 Information for Disposal and Recycling
This test set (including all accessories) is not intended for household use. After use,
the test set cannot be disposed of as household waste!
For Customers in EU Countries (incl. EEA)
OMICRON test sets are subject to the EU Waste Electrical and Electronic Equipment Directive
2012/19/EU (WEEE directive). As part of our legal obligations under this legislation, OMICRON offers
to take back the OMICRON test set and ensure that it is disposed of by authorized recycling agents.
For Customers Outside the EEA
Please contact the competent authorities for the relevant environmental regulations in your country
and dispose of the OMICRON test set only in accordance with your local legal requirements.

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CMC 850 User Manual
3 Designated Use
CMC 850 is a test set designated to evaluate, test and commission IEDs (Intelligent Electronic
Devices) in laboratories or substations that utilize GOOSE and Sampled Values according to
IEC 61850.
Any other use of CMC 850 is considered improper and may result in damage to property or persons.
4 Functionality
CMC 850 is part of OMICRON Test Universe system which, in addition to the physical test set,
consists of a test software for a computer with a Windows operating system, and, if applicable,
external voltage and/or current amplifiers1, PTP, IRIG-B or GPS1 time synchronization units or other
accessories.
4.1 Interfaces to the Test Environment
To interface with the test environment, CMC 850 provides two different functionalities.
The main focus is put onto IEC 61850 by employing Ethernet communication.
Additionally, CMC 850 provides low level outputs to either directly send low level signals to the device
under test, or to control external amplifiers.
For detailed information → “Connections and Interfaces” on page 10.
4.2 Operating CMC 850 with a controlling test software
Test Universe
As long as the interaction with devices under test utilizes GOOSE and Sampled Values, the CMC 850
test set supports all test modules of the Test Universe software. Test plans utilizing GOOSE and
Sampled Values, initially made for the test sets CMC 256plus or CMC 356, can also be used with
CMC 850.
An example Control Center (OCC) document that illustrates how to configure the Sampled Values and
GOOSE features for CMC 850 is provided in the Test Library that is installed with the OMICRON
Test Universe. The OCC document’s name is CMC 850 Example.occ, and it is stored at
...OTU installation path\Test Library\Samples\General Examples.
RelaySimTest
The CMC 850 test set can also be operated by the RelaySimTest software. For this, we strongls
recommend a NET-2 interface board to be installed in the test set (→ 5.2.1 "ETH1 and ETH2 Ports").
With a NET-2 board, a CMC 850 test set can work with up to 4 Sampled Values streams and GOOSEs
simultaneously via both ETH ports.
1. External voltage/current amplifiers and the CMGPS Synchronization Unit are not part of the standard scope of delivery. The CMGPS
Synchronization Unit is a meanwhile discontinued product. For questions about its successor CMGPS 588 contact the OMICRON
Technical Support or visit our website.

9
Functionality
4.3 Time Synchronization
•NTP - Network Time Protocol.
CMC 850 operates as a client to an NTP server. The time obtained this way is, for example, used
for time stamping GOOSE messages.
•PTP - Precision Time Protocol.
CMC 850 operates as a PTP slave node (IEEE 1588-2008, V2). The time obtained this way is, for
example, used for time stamping GOOSE messages.
•IRIG-B
The CMIRIG-B interface unit is another option for synchronized testing with CMC test sets and the
Test Universe software. It serves as the “clearing house” for IRIG-B and PPS signals, regardless
whether they come from an external clock or from the CMC itself. CMIRIG-B facilitates time
synchronized triggering of test sequences or synchronizing Sampled Values to a PPS.
4.4 Web Interface
CMC 850’s embedded functions are accessible via a Web Interface. Any common Web browser can
be used to access CMC 850 and to make use of the embedded functions. The Web Interface menus
link to pages dedicated to the different functions.
For a more detailed description, launch the Web Interface (→ page 17) and click Help.

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CMC 850 User Manual
5 Connections and Interfaces
5.1 Power Socket
5.2 Back Panel
5.2.1 ETH1 and ETH2 Ports
Depending on the interface board of your test set, the two PoE Ethernet (Power over Ethernet) ports
ETH1 and ETH2 are either:
• 10/100Base-TX (twisted pair) Ethernet ports (at NET-1(x) boards)
• or 10/100/1000Base-TX (twisted pair) Ethernet ports (at NET-2 board)
They support auto crossing (auto MDI/MDIX). This means you can use a standard cable or a
cross-over Ethernet patch cable.
Since CMC 850 can be controlled over a network, any distance between the controlling computer and
the test set is possible. This enables direct remote control of CMC 850, e.g., for end-to-end testing.
The Ethernet ports also provide the basis for the processing of substation protocols according to the
IEC 61850 standard. They allow flexible configurations, e.g., for separation of data traffic from different
network segments or segregation of substation protocol data and test set control commands.
The yellow and green LEDs at each ETH port reflect the port’s operational status. Depending on your
NET-x interface board, their behavior slightly varies → chapter 7.4, "Technical Data of the
Communication Ports" on page 20.
Power switch ON/OFF
48 VDC input from external power supply unit (isolated to housing).
ETH1 and ETH2 PoE (Power over Ethernet) ports (→ page 10)
Status LED “A” and “B” and "Associate" button (→ page 11)
! button (→ page 11)
USB ports (→ page 11)

11
Connections and Interfaces
5.2.2 USB Ports
The lower USB port (USB type B) at the CMC test set’s standard interface NET-2 board holds a USB
port to connect CMC 850 to your computer. To ensure the required EMC compatibility, we strongly
recommend to use the OMICRON-supplied cable, only.
The upper USB port (USB type A) at the CMC test set’s standard interface NET-2 board is meant for
future use of USB peripherals, such as memory sticks, etc.
For the technical data of the USB port → chapter 7.4, "Technical Data of the Communication Ports" on
page 20.
5.2.3 ! Button
The ! button enables you to recover from unsuccessful software image downloads or other
emergency situations. To start a new software image download, press the !button with a
pointed tool or a paper clip while powering-up the CMC. In that case, the test set will not start as
usual but wait for a new software image download.
5.2.4 Associate Button
The Associate button has the following functions:
• Associate with controlling computer
An Ethernet communication port enables you to communicate with any CMC available on the
network. This may lead to dangerous situations where a user accidentally connects to a device
located on a desk of somebody else, emitting unsafe voltages and endangering the person working
there.
To prevent such a situation, a special mechanism is integrated into CMC 850 that allows only
“authorized” clients to control the test set. By using the Associate button, the test set is registered
for use with a specific host PC. The test set issues voltages and current only when it is associated
to the client requesting this. The association process can be initiated by OMICRON Device Link
(→ “Setup and Operation” on page 16). For more details about this process, refer to the Help of the
according tool.
For the association the Ethernet hardware address (MAC) of the controlling computer is
remembered. Consequently, if the network interface on the computer has changed, CMC 850 has
to be associated whenever the MAC address changes.
• Reset IP Configuration
If the Associate button is pressed while powering up the CMC test set, the IP configuration of the
network interfaces is reset to factory default, which is DHCP/AutoIP for both network interfaces. It
may be necessary to reset the IP configuration in this way to recover from settings with conflicting
static IP addresses.
!
Associate

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CMC 850 User Manual
5.2.5 Status LED A, B
The status LED A and B are of interest in case of troubleshooting.
A: yellow status LED
• A lit yellow LED indicates that the test set is ready to be controlled by a computer. The hardware
checks in the test set are finished, and the test set is properly connected to a computer or a
network.
• The LED is off when the test set is waiting for an "emergency software image download". This is
the case when pressing the !button while powering-up the CMC test set.
B: green LED
If the yellow LED A is off, the green LED B signals the following conditions:
• LED B blinks slowly:
CMC test set waits for the TFTP download (Trivial File Transfer Protocol) of a software image.
• LED B is lit:
The TFTP download of the software image is in progress.
• LED B blinks quickly:
The computer writes (e.g., the software image) to the flash memory of the CMC test set. Do not turn
off the CMC test set as long as the writing is in progress.

13
Connections and Interfaces
5.3 Ethernet / Network Settings
General
The test software running on the PC communicates with CMC 850 via a network connection.
Therefore it is possible to either have CMC 850 directly connected to the computer’s network plug by
a cable or to have CMC 850 and the controlling computer connected to a computer network.
The yellow and green LEDs at each ETH port reflect the port’s operational status. Depending on your
NET-x interface board, their behavior slightly varies → chapter 7.4, "Technical Data of the
Communication Ports" on page 20.
IP Configuration
For communication of CMC 850 with the controlling PC and the OMICRON Test Universe software,
TCP/IP is used. The IP parameters are set by OMICRON Device Link. CMC 850 can either be set to
static IP addresses or use DHCP (Dynamic Host Configuration Protocol) and AutoIP/APIPA
(Automatic Private IP Addressing).
If the IP settings conflict with IP settings of other devices in the network, it is possible to reset the test
set to factory defaults (DHCP and AutoIP) by pressing the “Associate” button at the rear of the test set
while powering up the test set (→ page 11).
Security / Firewall Settings
To automatically detect and set the IP configuration of CMC 850 test sets in the network, IP-
multicasting is used by the Test Universe software. Therefore, a firewall program has to be configured
to allow for this communication. For the Microsoft Windows Firewall in the configuration of the firewall
is done automatically during installation of the OMICRON Test Universe.
The software component on the computer that automatically detects test sets on the network
(OMFind.exe) requires an enabled inbound connection on port 4987 for UDP. For TCP
communication, the software component on the computer that controls the test sets (CMEngAl.exe)
requires an enabled outbound connection on port 2200.

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CMC 850 User Manual
5.4 External Interface (“ext. Interf.”)
The interface connector “external Interface” holds four transistor binary outputs (Bin. out
11 - 14).
Bin. out 11 - 14 are bounce-free binary outputs (small signals) and have a minimal
reaction time.
For technical data → “Low Level Binary Outputs “ext. Interf.”” on page 19.
Pin assignment
Time Synchronization
To use the OMICRON-supplied CMIRIG-B interface unit as reference for the a time synchronization of
the IEC 61850 bus system, connect the CMIRIG-B‘s front side connector “CMC” to the CMC 850‘s
“external Interface” connector. This provides both the IRIG-B or PPS reference signal to CMC 850 and
the power supply for the CMIRIG-B.
ext. Interf.
Pin Function
Pin 1 Reserved
Pin 2 Reserved
Pin 3 Reserved
Pin 4 Neutral (N) connected to GND
Pin 5 Binary output 11
Pin 6 Binary output 12
Pin 7 Binary output 13
Pin 8 Binary output 14
Pin 9 Reserved
Housing Screen connection

15
Connections and Interfaces
5.5 LL out 1 - 6 and LL out 7 - 12 (Low Level Outputs)
The interface connectors “LL out 1 - 6” and “LL out 7 - 12” hold a total of 12 independent
high accuracy analog signal outputs. These Test Universe-controlled signal sources can
serve to either drive external amplifiers or to directly provide small signal outputs.
The low level outputs are short-circuit-proof and continually monitored for overload. They
deliver calibrated signals in the range from 0 ... 7 Veff nominal (0 ... ± 10 V).
For technical data, → “Low Level Outputs “LL out 1 - 6” and “LL out 7 - 12”” on page 18.
Overload Warning in the Test Software
When a low level output is overloaded, the test software issues an appropriate warning. Refer to the
Test Universe or RelaySimTest Help for more details.
Pin assignment
“LL out 1-3”, “LL out 4-6”, “LL out 7-9” and “LL out 10-12” each make up a selectable voltage or current
triple.
LL out 1 - 6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Function LL out 1-6 Function LL out 7-12
Pin 1 LL out 1 LL out 7
Pin 2 LL out 2 LL out 8
Pin 3 LL out 3 LL out 9
Pin 4 Neutral (N) connected to GND
Pin 5 LL out 4 LL out 10
Pin 6 LL out 5 LL out 11
Pin 7 LL out 6 LL out 12
Pin 8-16 For internal purposes
Housing Screen connection

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CMC 850 User Manual
6 Setup and Operation
Only operate (or even turn on) CMC 850 after you have read this manual and fully understood the
instructions herein.
Before operating CMC 850 for the first time, use the printed Quick Start to verify that all components
of the test system are available.
6.1 Installing the test software and connecting the computer to the
CMC 850 test set
1. Install the test software on your computer.
The test software can either be the Test Universe or the RelaySimTest software.
Both software packages also install the OMICRON Device Link. Use OMICRON Device Link to
associate CMC test sets that are connected to your computer via Ethernet (ETH).
2. Connect the power supply unit to CMC 850 and turn on the test set at the ON/OFF switch.
3. Connect the computer to CMC 850 via:
• Ethernet cable: Valid for NET-1B and NET-2.
• USB: Valid for NET-2 only.
Use one of the PoE
(Power over Ethernet)
ports ETH1 or ETH2, or
the USB port.
Either Ethernet or USB

17
Setup and Operation
6.2 Configuring network settings and accessing Web Interface via
Ethernet
1. Locate the CMC 850 test set in OMICRON Device Link
2. Associate the CMC 850 test set with your computer.
a) In the device list, right-click the CMC 850 entry to open a device-related menu.
b) Click Associate device and follow the on-screen instructions.
3. Access the embedded functions via the Web Interface
CMC 850’s embedded functions are accessible via its Web Interface. Any common Web browser
can be used to access CMC 850 and to make use of the embedded functions.
Alternative method to invoking the Web browser by the procedures described above:
a) Start a Web browser of your choice on your computer.
b) Enter CMC 850’s IP address (in a format like http://172.22.23.61) into the Web browser’s
address bar.
c) Hit the <Return> key.
6.3 Using a CMIRIG-B interface unit
To use the OMICRON-supplied CMIRIG-B interface unit as reference for the time synchronization of
the IEC 61850 bus system, connect the CMIRIG-B’s front side connector “CMC” to the CMC 850‘s
“external Interface” connector.

18
CMC 850 User Manual
7 Technical Data
General: The values are valid for the period of one year after factory calibration, within 23 °C ± 5 °C at
nominal value and after a warm-up time greater than 25 min.
7.1 External Power Supply Unit
7.2 Low Level Outputs “LL out 1 - 6” and “LL out 7 - 12”
Accuracy data for analog outputs are valid in the frequency range from 0 to 100 Hz, unless specified
otherwise.
Ordering Information
For a manufacturer description about the connection sockets "LL out", visit the Web site http://
www.lemo.com.
Nominal input voltage 110 - 240 VAC; 1 phase
Permissible input voltage 90 ... 264 VAC
Nominal frequency 50/60 Hz
Output voltage 48 VDC (± 6.25 %)
Rated current ≥ 1.66 A
Rated power ≥ 80 W
Power connector Standard DC barrel jack,
Ø 2.1 mm x Ø 5.5 mm x 11 mm; center pin is positive.
Output voltage -10 V ... +10 V
Max. output current 1 mA
Accuracy Typical error : < 0.025 %;
guaranteed: < 0.07 % at 1 V ... 10 V.
Resolution 250 μV
Harmonic distortion (THD+N)1
1. THD+N: values at 50/60 Hz, 20 kHz measurement bandwidth, nominal value and nominal load.
Typical: < 0.015 %.; guaranteed: < 0.05 %.
Phase error2
2. Valid for sinusoidal signals at 50/60 Hz.
Typical: 0.02 °; guaranteed: < 0.1 °.
DC offset voltage Typical: < 150 µV; guaranteed: < 1.5 mV.
Unconventional CT/VT simulation Linear or Rogowski3 mode (transient and sine wave).
3. When simulating Rogowski sensors, the output voltage is proportional to the derivative of the current with respect to time (di(t)/dt).
Insulation Reinforced insulation to all other potential groups of the
test equipment.
Connector for two guide notches and pull
relief
FGB.2B.316.CLAD 72Z
Black anti-bend cable cover GMA.2B.070 DN

19
Technical Data
7.3 Low Level Binary Outputs “ext. Interf.”
Circuit diagram of binary transistor outputs of “external Interface”
Type Open-collector transistor outputs;
external pull-up resistor
Switching voltage Max. 15 V
Max. input voltage ±16 V
Switch current Max. 5 mA (current limited); min. 100
µ A
Actualization time 100
µ s
Rise time <3
µ s (Vextern =5V, R
pullup =4.7kΩ)
Insulation Reinforced insulation to all other potential groups of the
test equipment.
Rear side of CMC 850
Rpullup
Inside of CMC 850
16 V
47 Ω6.8 kΩ
22 kΩ
Vextern = 5 ... 15 V
Binary outputs
"ext. Interf."

20
CMC 850 User Manual
7.4 Technical Data of the Communication Ports
An overview:
A CMC 850 test set’s standard interface board is the NET-2 board that, in addition to ETH1, ETH2 and
USB, provides one extra USB port for the use of USB peripherals, such as memory sticks, etc.
CMC 850 test sets with a NET-1(x) board can be upgraded with the new NET-2 board.
7.4.1 The NET-2 Board
NET-2: 2 x USB port and Ethernet ports ETH1/ETH2
USB type USB 2.0 high speed up to 480 Mbit/s
USB connector USB type A (for future use of USB peripherals)
Output current 500 mA max.
USB type USB 2.0 high speed up to 480 Mbit/s; USB 1.1-compatible
USB connector USB type B (connect to computer)
USB cable USB 2.0 high speed type A-B, 2 m/6 ft.
ETH type 10/100/1000Base-TX1 (twisted pair, auto-MDI/MDIX or auto-
crossover)
1. 10Base = 10 Mbit/s transfer rate
100Base = 100 Mbit/s transfer rate
1000Base = 1000 Mbit/s transfer rate
ETH connector RJ45
ETH cable type LAN cable of category 5 (CAT5) or better
ETH port status
LED
Depending on the ETH type of your NET-2 interface board’s
counterpart, the status LED’s behavior varies.
Physical link established, port active:
If there is traffic via an ETH port, the active LEDs start blinking.
ETH Power over
Ethernet (PoE)
IEEE 802.3af compliant.
Port capability limited to one Class 1 (3.84 W) and one Class 2
(6.49 W) power device.
Mbit/s Active LED ON
10 yellow
100 green
1000 yellow + green