Environmental Conditions

Laboratory meter test equipment should operate under the following climatic conditions.

Nominal temperature23 °C ±2 °C
Operating temperature range+5 °C … 45 °C
Limit range for storage and transport   (max. 6 h at the extremes of this temperature range) -25 °C … 60 °C
Max. relative humidity≤ 85 %, not condensate

The environment should be dust free.

share by QR code


A unit of power equal to one joule of energy per second. Dimension letter is W
For DC sources we calculate the energy by multiplication of voltage with current.
For AC sources we multiply additional with the power factor to get watts.
Some multiplication factors for watt:
103 W = kilowatt, kW
106 W = megawatt, MW
109 W = gigawatt, GW
1012 W = terrawatt, TW

share by QR code

Instantaneous Power

Instantaneous power

The measurement micro-controller sends the measured values approximately every 100 ms. Each instantaneous power value is available per phase and sum over all phases. All phase instantaneous power values can be calculated by vector or arithmetic method. Not all CLOU meters have this functionality.

OBIS codes  L1 L2 L3 Sum
A+ 21.7.0 41.7.0 61.7.0 1.7.0
A- 22.7.0 42.7.0 62.7.0 2.7.0
Q+ 23.7.0 43.7.0 63.7.0 3.7.0
Q- 24.7.0 44.7.0 64.7.0 4.7.0
Q1 25.7.0 45.7.0 65.7.0 5.7.0
Q2 26.7.0 46.7.0 66.7.0 6.7.0
Q3 27.7.0 47.7.0 67.7.0 7.7.0
Q4 28.7.0 48.7.0 68.7.0 8.7.0
S+ 29.7.0 49.7.0 69.7.0 9.7.0
S- 30.7.0 50.7.0 70.7.0 10.7.0
ABS = |A+|+ |A-| 35.7.0 55.7.0 75.7.0 15.7.0
NET = |A+|- |A-| 36.7.0 56.7.0 76.7.0 16.7.0
share by QR code

How to connect the RS350 to different meter types?

This is only a short reference for most common meters. Make sure that you have read the RS350 operation manual with more examples.
Always follow your company safety guidelines. In addition it’s no mistake to take a look at our safety regulations.

Singlephase two wire meter, DIN terminal
Singlephase two wire meter, DIN terminal
single phase 2 wire, BS terminal
single phase 2 wire, BS terminal
DIN threephase 4 wire, direct connected
DIN threephase 4 wire, direct connected
DIN threephase 3 wire
DIN threephase 3 wire
DIN threephase 4 wire CT
DIN threephase 4 wire CT
DIN threephase 4 wire CT/PT
DIN threephase 4 wire CT/PT

Wiring Diagrams

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 of each component is clearly marked with a yellow identification sticker. This sticker corresponds with the electrically and pneumatically diagrams. The same identifier is also used in service- and operation manuals.

CLOU is using sub-group identifiers. Each component has a unique identifier. Structure of naming:

– (prefix for components)
– letter for main class
– letter for sub-class
– incrementing number

A small vertical line at the end of a conductor indicates that the line will continue. The continuity of the line is referenced with page no + / + row + column
Example: 5/ A2 links to page 5, row A, column 2

share by QR code

Active Power

rate at which energy is transported

Note: In an electrical system active power is measured as the time mean of the instantaneous power, which is calculated at each instant as the product of voltage and current

At sinusoidal conditions active power is the product of the r.m.s. values of current and voltage and the cosine of the phase angle between them, calculated for each phase. It is usually expressed in kW.

share by QR code