Metering Blog

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Face Recognition System CL2055

Face Recognition System CL2055

The face recognition system CL2055 has an integrated temperature scanner. It\'s suitable where ever entrance control with body temperature measurement is needed. ...
User Interface Unit UIU

User Interface Unit UIU

The user interface unit (UIU) is a device for remote access to STS payment meters. ...
Negative Phase Current

Negative Phase Current

Electronic energy meters can have various additional useful functions for tamper protection, event logging or billing. ...
Efficiency on Wednesdays

Efficiency on Wednesdays

Our management has instructed the R&D department to come out with an automated solution. We are CLOU, so the product was finished in 20 days. ...
Preventive Measures for Virus Control

Preventive Measures for Virus Control

As you maybe already know the New Year started not as expected. Cases of a contagious coronavirus have increased dramatically over the past weeks. ...
What is Measurement Uncertainty?

What is Measurement Uncertainty?

When we do high precision measurements we have to make sure that we are getting the measurement results as accurate as possible. ...
Wrong Phase Sequence

Wrong Phase Sequence

The measurement circuit of CLOU three-phase energy meters constantly monitors transition through zero on all phase voltages. ...
Welcome to the Year of the Rat 2020

Welcome to the Year of the Rat 2020

As usual our company has rented the Shenzhen sports stadium for the annual Spring Festival Gala and Outstanding Staff Award Ceremony. ...
What are Transient Voltages?

What are Transient Voltages?

Transient voltages are short time peaks in the a.c. power supply. They typically last a few milliseconds and the voltage can reach several thousand volt. ...
What is a Voltage Swell Event?

What is a Voltage Swell Event?

A voltage swell is a surge (increase) of voltage above 110 % of the rms magnitude in your power grid. The duration can be between ...
What is a Voltage Dip Event?

What is a Voltage Dip Event?

Sometimes it\'s also referred to voltage sag (IEEE term). The meaning is the same. This article explains the power quality event logging inside of smart ...
The First Breath Notification

The First Breath Notification

The First Breath Push notification is sent to the head end system (HES) as soon as the meter is powered up. ...
The DLMS Push Message

The DLMS Push Message

A electronic energy meter with communication via DLMS can be configured to send Push messages. Usually a meter acts as a server. ...
The Last Gasp Outage Notification

The Last Gasp Outage Notification

Smart meters can generate a Push message in case of power fail. This event is called Last Gasp. ...
Practical Use of Load Profiles

Practical Use of Load Profiles

Electronic energy meters can save internally a lot of data. When this data are saved periodically with time stamp, we talk about a load profile. ...
The TOU Tariff Structure

The TOU Tariff Structure

TOU stands for time of use. It\'s getting popular together with smart energy meters and advanced metering infrastructure (AMI). ...
Energy Meters and Tariffs

Energy Meters and Tariffs

Electronic energy meters are recording the actual power over a certain time. The microprocessor inside of these meters allows all kind of additional calculations. ...
Sealing of Energy Meters

Sealing of Energy Meters

Electrical Energy meters are sealed to detect possible manipulations. The utility field workers check the meter installations regular. ...
Sealing of Optical Ports

Sealing of Optical Ports

The optical port is for local communication with energy meters. With suitable software and an optical reading head you can access to the meter for ...
Principle for Accuracy Testing of Energy Meters

Principle for Accuracy Testing of Energy Meters

Now meter testing is much more comfortable. Actually you only need to put the meters on the rack. For testing big quantities of meters a ...
Basics of Energy Meter Accuracy Tests

Basics of Energy Meter Accuracy Tests

In the past without any electronics a accuracy test was really challenging. You needed a voltage/current source with a high stability, calibrated wattmeters and a ...
How does a scanning head work?

How does a scanning head work?

Each energy meter used for billing must have a test output. An optical indication is mandatory. Beside this the meter can also have electrical test ...
The Three-phase Generator Principle

The Three-phase Generator Principle

We have a nice three phase power supply in our home, but where does it come from? And why does the waveform has a sine ...
Accelerated Life Test for Energy Meters

Accelerated Life Test for Energy Meters

There are several ways to predict the reliability of an energy meter. The IEC provides a series of standards related to reliability tests or evaluations. ...
How does Net metering work?

How does Net metering work?

When you are generating power by solar or wind, you might produce more energy than you actually need. ...
Is there a Lifetime Calibration?

Is there a Lifetime Calibration?

Electronic energy meters are adjusted for life-time. A recalibration has to be done by country rules and regulations. ...
What will be the recorded demand?

What will be the recorded demand?

What will be the recorded demand if a constant load of 1 kW is applied through a 30 minute demand meter ? ...
How to get a Clear Tamper Token?

How to get a Clear Tamper Token?

A clear tamper token is required to unlock a STS meter showing the tamper sign. Only the local power company can issue this token code. ...

What is a Load-Switch?

Usually in electricity meters the load switch is a latching relay. A latching relay keeps its contact position indefinitely without power applied to the coil. ...
Make the Most of Portable Meter Test

Make the Most of Portable Meter Test

In order to protect the utility revenue it’s essential to do regular on-site tests on meter installations. If you are suffering huge losses you should ...

Johannesburg Ransomware Attack

Cyberattacks against critical infrastructure have become common. This time, a ransomware infection has been reported on the systems of City Power, one of South Africa’s leading power ...

Security for Optical Ports on Energy Meters

Optical ports provide local access for service engineers during installation or maintenance of energy meters. Households have physical access to their energy meter and might ...
European Accreditation

European Accreditation

The European Accreditation Association has per country one member. This members are allowed to approve test laboratories for calibration. ...

What is DLMS/COSEM ?

DLMS stands for Device Language Message Specification,a generalised concept for abstract modelling of communication entitiesOfficial website The COmpanion Specification for Energy Meteringsets the rules, based ...
Calculation methods for energy

Calculation methods for energy

We got several questions related to the different recording methods for electrical energy meters. Here is the behaviour with different settings: Vector registration method (∑L)By ...

General information for wiring diagrams

Understanding the markings and cross references CLOU follows the DIN EN 81346-2 for marking and identification of components inside of automated test equipment. The hardware ...

Environmental Conditions For Meter Test

Laboratory meter test equipment should operate under the following climatic conditions. Item Value Nominal temperature 23 °C ±2 °C Operating temperature range +5 °C  45 °C Limit range for storage ...
Acceptance tests for energy meters

Acceptance tests for energy meters

From time to time there are some questions regarding the acceptance inspection (FAT) for energy meters. This paper is to clarify the legal and metrological ...
The difference between adjustment and calibration

The difference between adjustment and calibration

The term calibration is often misused.Calibration means the comparison of a unit under test (in our case a energy meter or reference standard) with a test equipment ...
Pulse Calculation for Stationary Test Benches

Pulse Calculation for Stationary Test Benches

All energy meters used for billing purpose have a test output for calibration. This can be flashing diode, a pulse output at the terminal or ...

Terminal wiring for electrical energy meters

Many people are messing up with the energy meter type descriptions. There are two standards for the wiring of bottom-connectedenergy meters. DIN 43857 BS 5685 ...

How long does a no-load test take?

First we take a look at the IEC standards. The run-time depends on several factors like accuracy class meter constant number of elements Nominal Voltage ...

The different current subscripts

Together with tender documents and meter specifications you will find various subscripts related to current. current I without subscriptThis is the actual current flowing trough ...
When do I need Isolation Current Transformers?

When do I need Isolation Current Transformers?

Isolation Current Transformers (ICT) are needed to test more than one direct connected energy meter on a test bench with multiple positions, assuming that the ...
The Standard Transfer Specification STS

The Standard Transfer Specification STS

The Standard Transfer Specification (STS) has become recognised as the only globally accepted open standard for prepayment systems, ensuring inter-operability between system components from different ...
The four-quadrant diagram in electricity metering

The four-quadrant diagram in electricity metering

The interactive diagram below shows the relationship between the phase angle φ, apparent-, active- and reactive power respective energy in accordance with clauses 12 and ...

Why do I need a vector diagram?

Modern reference standards and calibration devices have usually a graphical function to show the relationship between the voltages and the currents. Most equipment manufacturers call ...
What are harmonics ?

What are harmonics ?

Generally a harmonic is a integer multiple of the fundamental frequency (nominal fn). When we have a fn of 50 Hz, the 3rd harmonics is ...
Vectorial- and arithmetic VA calculation

Vectorial- and arithmetic VA calculation

. There are two commonly used methods to calculate the apparent power (VA). The traditional method is the vectorial calculation. ...

What is Maximum Demand Measurement?

Demand is a measure of average power consumption over a fixed time interval. Maximum (or peak) demand is the highest demand recorded over the billing ...

What is the difference between technical loss and non-technical loss?

Technical losses are coming from current flowing in electrical installations. They can not be avoided, but reduced by proper installation. Technical losses can be calculated. Losses ...
Personal Safety for electrical installations

Personal Safety for electrical installations

It’s never a mistake to read the basics again. Avoid contact with energized electrical circuits Treat all electrical devices as if they are live or ...

12 Replies to “Metering Blog”

  1. I have a clou meter token and am just wondering how i can silence the beeping alarm that goes off when your are low on tokens. Its kinda annoying. Ypur help will be highly appreciated.
    Regards,
    Steve

    1. Steve, try code 812 on your UIU (user interface unit) and confirm by pressing the enter-button (blue or red). If it doesn’t work, please tell us the meter model type.

    1. If the energy meter has a function for measuring reactive energy, it must have a test output (a flashing diode) indicating the reactive consumption. This test output has a meter constant, indicated in e.g. pulses per kvarh. You set measurement mode in your test plan to reactive measurement and adjust the scanning heads in front of the reactive diode. All other procedure is the same like active accuracy test. The settings for reactive power is done inside the test bench and reference standard automatically.

  2. which is the standard to be used for testing of for Reactive power in energy meter and what are the acceptable error margins?

    1. The IEC 62053-23 is applicable for static meters for reactive energy (classes 2 and 3). The allowed errors for accuracy are given in the related tables. If you have a meter with reactive class 2, the allowed error is +/-2% for all balanced loads above 0.1 Ib and power-factor 1.

  3. My CLOU (CL710K11) just shows zeros when I try to enquire balance or input new token, I think it is not communicating with the power source

    1. The possible reason could be long communicate distance or the power cable quality,plsase use another socket and try again. if still doesn’t work,pls confirm whether the UIU address is right one( enter 1593570 plus the meter number to set the UIU address).

    1. Thank you for your message. The operation manual is for the power company or utility. End users get an introduction by the power company and a reference card with the user interface short codes. The configuration for each power company is different. If you are in doubt about a function, ask your power supplier.

    2. My CL710K11 meter
      Red light is lit next to the word “WIRING” and I noticed low power in house today. Any idea what could be the problem.

    3. It indicates a poor communication between the user interface unit and the meter. One reason behind can be a very low supply voltage from the grid.

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