Category: portable | Shenzhen CLOU

The portable reference standard and calibrator RS350 is especially designed for the needs of metering engineers for on-site testing with high precision.
The equipment offers highest functionality together with excellent menu guided operation through a 8” Tablet PC.
It’s the perfect instrument to reduce technical- and non-technical losses.

What can I do with this instrument?

Accuracy Tests for Energy Meters

The RS350 can perform error measurement for maximum 3 energy meters at time. The last five individual errors are shown on the tablet together with average error and standard deviation.
The instrument can also detect the meter constant, if the meter is not proper marked.
The tablet gives full information for the testing time, remaining time and shows a progress bar. Instrument transformer ratios can be easy applied.

doing five accuracy tests in 27 seconds

Energy Register Tests

Register tests are necessary to verify that the energy supplied to the meter is matching with the internal register or counter. The RS350 can perform this tests on site.

Demand Register Tests

The RS350 can check demand registers over a defined time for up to 3 meters in parallel.

Instrument Transformer Testing

RS350 CT Error — *error test for current transformers*

The RS350 can perform various instrument transformer tests. Current transformers can be tested for ratio, phase displacement and burden.

Real Time Measurement

RS350 Real Time Parameters — *display of all available parameters*

The RS350 real time measurement display shows all 51 electrically relevant parameters on one screen. The instrument shows THD & Crest Factor for each phase in voltage & current. It has an easy application of Instrument transformer (IT) ratios for comparison purpose.
Supported are many measurement modes, e.g. 1Ph 2W, 3Ph 3W, 3Ph 4W, in active, reactive & apparent mode, (total & fundamental).
The Apparent power definition is switchable between arithmetical- or trigonometric calculation.

Long Time Measurement

The RS350 can record all basic measurement values in cyclic time intervals. The intervals can be set between 1 to 99 seconds. The tablet can store 36,000 records (10 hours with 1 second interval time). The results can be displayed in table- or graphical format. It’s also possible to export the data to a comma separated values file (CSV).
The record interval and integration time can be controlled by a start/stop timer.

Waveform Analysis

The RS350 can flexible selected display the actual voltage- and current waveforms for maximum 6 channels in parallel, either in one graph or in one graph per phase.
All waves can be saved. To capture suspicious events the RS350 has a HOLD function.
The RS350 can also show the waveforms of active- and reactive power.

Harmonics Analysis

RS350 harmonics — *harmonics graph for phase L2*

The RS350 can perform the analysis for harmonic content in voltage & current circuits up to 63^rd order. All harmonics are displayed simultaneously on one screen in graphical or table format.
All 6 channels can be stored together.
It’s possible to select the harmonics in percent of the fundamental wave or as total RMS value.
Power harmonics are displayed by phase.

Wiring Check

The RS350 helps you to debug complex wiring problems.

Vectorial display along with relevant electrical parameters
Automatic hints on the actual wiring status
Supports both vectorial presentations (U & I based)
Power quadrant display (per phase & total)

Site Analysis

The automatic site analysis function of the RS350 checks the essential parameters versus predefined limits and makes wiring checks for the meter tester easier.
Indicated with PASS/FAIL information are:

Presence of voltages & currents
Direction of currents
Balancing of phase voltages & currents
Phase symmetry
Phase sequence of voltage & current circuits
THD in voltage & current circuits

The limits can be set as per utility rules and regulations.

Wiring Simulator

The calibrator RS350 has a integrated wiring simulator. The simulator can be used for analysis and for training purpose. It can either read the actual values or simulation values.
It’s written in HTML/Javascript and supports most browsers. Take a look here for full screen mode. All grey circles are interactive.
It is possible to read and analyse the actual RS350 values. The interesting part is the financial loss due to irregular wiring at the right bottom.

Meter Testing Workflow

The workflow for the meter tester can be defined by the utility. It allows to create systematic meter test sequences. Once the structure is defined, all meter testers will report with the same testing content and nothing will be forgotten. The RS350 guides the user trough all test steps.
The test sequence can include:

recording site data
verification of proper sealing
taking of photos
accuracy tests
record of the GPS location
Signature of witness
Report generation

You can share the reports by email, Whatsapp, Wechat or to whatever service is available on your tablet/phone.

Database

The RS350 has an internal database for all saved data. The pdf-reports are generated from the database.
Individually imported and exported for synchronisation can be:

customer information
meter types
site information
meter test workflows

All test data can be uploaded to a common PC database working under our Electric Measurement Studio platform (EMS5).

Product Details

Specifications

Mains and environment
Voltage:	60 V – 265 V AC
Frequency:	47 Hz – 63 Hz
Power consumption:	< 30 VA
Operating temperature:	-5 °C – 50 °C
Max. relative humidity:	≤ 85 %, not condensate
Surge voltage protection:	class C
Installation category:	III
Pollution degree:	2
Ingress protection	IP 30
Housing material	Polycarbonate
Weight:	< 3 kg
Dimensions	268 mm x 243 mm x 68 mm

Measurement parameters
Test voltages, phase-neutral	0.5 V – 576 V
Voltage ranges	60 V, 120 V, 240 V, 480 V, auto range
Test current, direct connected	1 mA – 24 A
Current ranges	20 mA, 50 mA, 100 mA, 200 mA, 500 mA, 1 A, 2 A, 5 A, 10 A, 20 A, auto-range
Frequency range, fundamental wave	15 Hz – 70 Hz
Bandwidth	4 kHz
Voltage measurement accuracy	< 0.01 %
Voltage measurement drift	< 35 ppm/year
Current measurement accuracy < 25 mA	< 0.02 %
Current measurement accuracy ≥ 25 mA	< 0.01 %
Current measurement drift	< 65 ppm/year
Power measurement accuracy P, Q, S (related to apparent power)	< 0.05 % (current ≥ 25 mA and λ = 1)
Power measurement drift	< 100 ppm
Phase angle	< 0.01° (current ≥ 25 mA and voltage > 30 V)
Frequency	0.005 Hz
Voltage temperature drift	< 2,5 ppm/K
Current temperature drift	< 5 ppm/K
Power temperature drift	< 7.5 ppm/K

Content of Delivery

Calibrator and Tab

Reference Standard and Tablet PC
The calibrator RS350 has it’s own compartment inside of the transport case. The tablet is for transport safely stored in the case flap.
The actual tablet is a Lenovo TB3-850F. It has 1 GB RAM and 16 GB internal storage. Operation with battery is up to 8 hours.

Transport Case

The equipment is delivered in a trolley with wheels and handle for easy transportation. The trolley is designed in such way that you can leave the RS350 inside and only make the connections to the meter. The cables can remain connected to the RS350 during transport. This saves time and increases the efficiency of use. The suitcase dimensions are 483.5 mm x 474 mm x 237 mm. The weight with standard accessories is less than 12 kg.

RS350 case, front view — RS350 case, top view

Scanning Head

Scanning head specifications

parameter	value
Wave-length	400 – 1100 nm
max. frequency, unmodulated	> 3 kHz
max. frequency, modulated	> 9 kHz
dark to light change	max. 15 µs
light to dark change	max. 15 µs
uncertainty of switching edge detection	±1 µs
pulse width	min. 0.2 ms
operating voltage	3.3 V – 24 V DC
operating current	≤ 50 mA
scanning distance	0 – 50 mm
output signal, high	≥ 3.0 V
output signal, low	≤ 0.3 V
Housing	Polycarbonate
Color	blue-grey
dimensions	30 mm x 46 mm x 22 mm
weight incl. cable	< 80 g
cable length	2 m
ingress protection	IP 54
operating temperature	-40 °C – +85 °C
relative humidity	> 85 %

Cables and Connectors

The content of delivery for the calibrator RS350 includes:
10 pcs laboratory cable
4 pcs crocodile clips
10 pcs connector with cable lug
10 pcs adapter with 4 mm pin
10 pcs connector with pin
1 mains power supply cable
10 fuses

Clamp-On CTs, 120 A

The content of delivery for the calibrator RS350 includes 3 pcs. clamp-on CTs. The CLOU clamp-on CT is designed to perform measurements up to 100 A + 20 %. The CT is rated for 600 V ac circuits of Measurement Category III, Pollution Degree 2, per EN/IEC 61010-1 and EN/IEC 61010-2-032.

Specifications
The accuracy classes are related to apparent power. The given accuracy classes are including the internal RS350 error.

Range	current	Accuracy class
100 A	24 A ≤ 120 A	0.2
20 A	6 A < 24 A	0.2
5 A	1.2 A < 6 A	0.2
1 A	0.24 A < 1.2 A	0.3
0.2 A	0.05 A < 0.24 A	0.5

Mechanical parameters
Can be uses for wiring diameters	up to ⌀ 20 mm
Max. Jaw opening	20 mm
Dimensions	53 mm x 138 mm x 28 mm
Weight	350 g
Material	PC + ABS + Polycarbonate, UL94 V0

Electrical parameters
Primary current	10 mA – 120 A AC
Max. continuous input current	120 A
Ratio	1200 : 1
Load capacity	≤ 4 Ω
Over voltage category	CAT III 600 V
Frequency range	40 Hz – 3800 Hz
Dielectric strength	3 kV 50 Hz / 60 Hz for 1 minute
Temperature range	-20 °C – +55 °C
Output	2.0 meter cable with connector for RS350
Max. voltage not insulated conductors	600 V
Compliant with Standards	EN/IEC 61010-1, EN/IEC 61010-2-032, IEC 60044-1

Pulse Output Cable

This cable adapter is used for accuracy verification of the RS350 against a higher accurate standard (e.g. our reference standard CL3115)

Documentation

The documentation for the calibrator RS350 includes:

user manual
company calibration certificate
warranty card

3rd party calibration certificates can be provided at additional cost.

Optional accessories

Clamp-On CTs, 5 A

The CLOU clamp-on CT is designed to perform measurements up to 5 A + 20 %. The CT is rated for 600 V ac circuits of Measurement Category III, Pollution Degree 2, per EN/IEC 61010-1 and EN/IEC 61010-2-032.

Specifications

The accuracy classes are related to apparent power. The given accuracy classes are including the internal RS350 error.

Range	current	Accuracy class
5 A	2.4 A ≤ 6 A	0.2
2 A	1.2 A < 2.4 A	0.2
1 A	0.6 A < 1.2 A	0.2
0.5A	0.24 A < 0.6 A	0.2
0.2 A	0.12 A < 0.24 A	0.3
0.1 A	0.05 A < 0.12 A	0.3

Mechanical parameters
Can be uses for wiring diameters	up to ⌀ 8 mm
Max. Jaw opening	10 mm
Dimensions	53 mm x 136 mm x 28 mm
Weight	350 g
Material	PC + ABS + Polycarbonate, UL94 V0

Electrical parameters
Primary current	10 mA – 6 A AC
Max. continuous input current	6 A
Ratio	1000 : 1
Load capacity	≤ 4 Ω
Over voltage category	CAT III 600 V
Frequency range	40 Hz – 3800 Hz
Dielectric strength	3 kV 50 Hz / 60 Hz for 1 minute
Temperature range	-20 °C – +55 °C
Output	2.0 meter cable with connector for RS350
Max. voltage not insulated conductors	600 V
Compliant with Standards	EN/IEC 61010-1, EN/IEC 61010-2-032, IEC 60044-1

Clamp-On CTs, 1000 A

The CLOU clamp-on CT is designed to expand the measurement capabilities of CLOU calibrators like RS350 in industrial and power environments to measurements up to 1000 A + 20 %. The CT is rated for 600 V ac circuits of Measurement Category III, Pollution Degree 2, per EN/IEC 61010-1 and EN/IEC 61010-2-032.

Specifications
The accuracy classes are related to apparent power. The given accuracy classes are including the internal RS350 error.

Range	current	Accuracy class
1000 A	between 1200 A and 100 A	0.2
100 A	between 100 A and 10 A	0.1
100 A	Between 10 A and 500 mA	0.2

Mechanical parameters
Can be uses for wiring diameters	up to ⌀ 50 mm
Max. Jaw opening	50 mm
Dimensions	103 mm x 220 mm x 28 mm
Weight	550 g
Material	PC + ABS + Polycarbonate, UL94 V0

Electrical parameters
Primary current	0 – 1000 A AC
Max. continuous input current	1200 A
Ratio	2000 : 1
load capacity	≤ 4 Ω
Over voltage category	CAT III 600 V
Frequency range	40 Hz – 3800 Hz
Dielectric strength	3 kV 50 Hz / 60 Hz for 1 minute
Temperature range	-20 °C – +55 °C
Output	2 m cable with connector for RS350
Max. voltage not insulated conductors	600 V
Compliant with Standards	EN/IEC 61010-1, EN/IEC 61010-2-032, IEC60044-1

Clamp-On CTs, 2000 A

The CLOU clamp-on CT is designed to expand the measurement capabilities of CLOU calibrators like RS350 in industrial and power environments to measurements up to 2000 A + 20 %. The CT is rated for 600 V ac circuits of Measurement Category III, Pollution Degree 2, per EN/IEC 61010-1 and EN/IEC 61010-2-032.

Specifications

The accuracy classes are related to apparent power. The given accuracy classes are including the internal RS350 error.

Range	current	Accuracy class
2000 A	between 2400 A and 600 A	0.1
500 A	between 600 A and 120 A	0.2
100 A	Between 120 A and 24 A	0.3
20 A	Between 24 A and 2 A	0.5

Mechanical parameters
Can be uses for wiring diameters	up to ⌀ 50 mm
Max. Jaw opening	75 mm
Dimensions	116 mm x 327 mm x 35 mm
Weight	550 g
Material	PC + ABS + Polycarbonate, UL94 V0

Electrical parameters
Primary current	0 – 2400 A AC
Max. continuous input current	2400 A
Ratio	4000 : 1
load capacity	≤ 4 Ω
Over voltage category	CAT III 600 V
Frequency range	40 Hz – 3800 Hz
Dielectric strength	3 kV 50 Hz / 60 Hz for 1 minute
Temperature range	-20 °C – +55 °C
Output	2 m cable with connector for RS350
Max. voltage not insulated conductors	600 V
Compliant with Standards	EN/IEC 61010-1, EN/IEC 61010-2-032, IEC 60044-1

Clamp-On CT, 100 A, neutral

The RS350 can measure the current in Neutral together with the phase currents.
For Neutral current measurement an additional current clamp is needed.
The specifications are the same as for the 100 A clamps.

Extension Box for 3 Scanning Heads

The functionality of the RS350 hardware can be enhanced to use 3 scanning heads in parallel. For this purpose we have an extension box together with a connection cable to the RS350.

Additional Scanning Head

The basic set of the calibrator RS350 includes one scanning head. Sometimes it’s useful to check the accuracy of two or three energy meters in parallel. The hardware is supporting maximum 3 scanning heads.
The additional scanning heads are delivered with fixing devices.
Please note that the extension box is needed when using more than one scanning head.
The specifications are the same as for the original delivered head.

Wireless Scanning Head

This scanning head can be used for detection of metrological LED pulse outputs for static electronic meters together with CLOU portable meter test equipment RS350.
The TP-17 Wireless scanning head is based on the Nordic nRF24L01+, highly integrated, ultra low power (ULP) 2 Mbps RF transceiver for the 2.4 GHz ISM (Industrial, Scientific and Medical) band. It includes the Enhanced ShockBurst™ hardware protocol accelerator for a high-speed SPI interface. The no. of TP-17 Wireless scanning heads working in parallel is not limited.

The scanning system consists of

Scanning head TP-17 wireless 2.4 GHz transmitter, fixed at the energy meter
Fixing device TP-GS 2
– fastening to meter by two side-plates, can be moved up and down along the meter
– can be used for rectangle- or round meters
– adjustable width from 35 to 180 mm
– provides magnetic adhesion to scanning probes
– provides mechanical adhesion to scanning probes
– probes can be moved left/right freely
– made of insulation material, which ensures safety and portability
Receiver TP-17 wireless
USB charging cable for scanning head
Pairing cable
Transport bag

The scanning head TP17-wireless is designed and manufactured in conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA). The compliance was verified by MicroTest (external type test laboratory).

Specifications scanning head TP-17 Wireless
wavelength	400 …1100 nm
max. sampling frequency	3 kHz
uncertainty of switching edge detection	± 1 μs
pulse width	≥ 0.2 ms
operating voltage	3.3 V DC
scanning distance	10 … 100 mm
housing	hard plastic
color	blue-grey
dimensions	55 mm x 30 mm x 38 mm
weight	< 90 g
transmission power	0 dBm ≙ 1 mW
transmission range, outdoor	max. 40 m
transmission range, indoor, industrial environment	25 m (one wall)
battery capacity	800 mAh
permanent operation, battery full charged	72 h
battery charging	USB adapter cable
ingress protection	IP 54
operating temperature:	-40 °C…+85 °C
relative humidity:	> 85 %

Specifications receiver for scanning head TP-17 Wireless
operating voltage	3.3 V … 5 V DC
operating current	≤ 30 mA
output signal, high	≥ 4.5 V
output signal, low	≤ 0.3 V

Start/Stop Switch

This switch is connected to the pulse input socket of the RS350. It is used to test electromechanical meters under low load conditions.
A scanning head needs about 2 full rotations of the meter disk for adjustment. With the Start-Stop switch you can monitor the mark on the disk. When it is in front, you press the button for starting the measurement. Once the mark arrives again at the front, press the button and see the error result.

Frequently Asked questions

What are the constants of the RS350?

RS350 power constants
	60 V	120 V	240 V	480 V
0.02 A	5x 10¹⁰	2.5x 10¹⁰	1.25x 10¹⁰	6.25x 10⁹
0.05 A	2x 10¹⁰	1x 10¹⁰	5x 10⁹	2.5x 10⁹
0.1 A	1x 10¹⁰	5x 10⁹	2.5x 10⁹	1.25x 10⁹
0.2 A	5x 10⁹	2.5x 10⁹	1.25x 10⁹	6.25x 10⁸
0.5 A	2x 10⁹	1x 10⁹	5x 10⁸	2.5x 10⁸
1 A	1x 10⁹	5x 10⁸	2.5x 10⁸	1.25x 10⁸
2 A	5x 10⁸	2.5x 10⁸	1.25x 10⁸	6.25x 10⁷
5 A	2x 10⁸	1x 10⁸	5x 10⁷	2.5x 10⁷
10 A	1x 10⁸	5x 10⁷	2.5x 10⁷	1.25x 10⁷
20 A	5x 10⁷	2.5x 10⁷	1.25x 10⁷	6.25x 10⁶

The table refers to the automatic settings. It's valid for 3 wire- and 4 wire measuring mode.

The output frequency for end of range in voltage/current pair with three phase connection is 50 kHz. The power pulses are on TTL/CMOS level. The burden capacity is > 20 mA.

Calculation formulas

Frequency

Constant

Where can I download the specifications?

Complete specifications, can be used for comparison or tender purpose (doc-file, 120 kB)

Do you have a demo video for meter test?

Lixin is doing a meter test

Do you provide training?

We are also offering theoretical- and practical training, either in our headquarter in Shenzhen or at customer site.

For more information please contact us

voltage output	1 V ... 456 V (ph-N)
voltage stability	0.02 % ti = 120 s
voltage THD	≤ 0.2%
voltage output power	3x 25 VA
current output	10 mA ... 120 A
current stability	0.02 % ti = 120 s
current THD	≤ 0.2%
current output power	3x 35 VA
active power accuracy	0.05 %
reactive power accuracy	0.1 %
phase shift	±180°
adjustment	0.01°
power factor range	-1 ... 0 ... +1
frequency output	45 Hz ... 65 Hz
frequency accuracy	0.002 Hz
harmonics	2nd to 21st
harmonics amplitude	0 ... 40 %
harmonics phase shift	±180°
accuracy, active energy	0.05 %
accuracy, reactive energy	0.1 %
dimensions	471 mm x 445 mm x 190 mm
weight	30 kg
mains power supply	200 V ... 240 V, 50 Hz