DW500UB-2V

**DW500UB-2V** 

High precision fluxgate AC/DC current transducer for galvanically isolated measurement up to 750 A 

## **Features** 

- 500 A rms nominal current 

- 2V output at 500 A through BNC connector 

- 24/30 mm aperture with/without plastic insert 

- 10 MHz bandwidth 

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- 12.5 ns phase delay 

- 15 ppm linearity 

- 15 ppm offset 

- Dedicated power supply included 

## **Description** 

High precision wide bandwidth DC current transducer (DCCT) measuring up to 750 A currents and continuously measuring 500 A currents with a linearity error less than 15 ppm. 

Using a special high frequency transducer head, the DW500UB-2V has a very wide bandwidth up to 10 MHz. Phase compensation is made easy thanks to a near constant phase delay of around 12.5 ns, including a 2m coax cable. 

Based on the ultra stable Danisense closed loop flux gate technology, the DW500UB-2V has very low offset and ultra low drift. 

## **Applications** 

- Electric vehicle (EV) test bench 

- High frequency applications 

- Power measurement and power analysis 

- Precision drives 

- Battery testing and evaluation systems 

- Wide bandgap (WBG) SiC and GaN devices 

- Current calibration 

Built in a compact aluminium housing, it provides high resolution for precise monitoring, reliable and consistent performance, and a rugged design for durability. 

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## **Electrical specifications at 23 °C** 

|**Electrical specifcations at 23 °C**|||||
|---|---|---|---|---|
|**Parameter**|**Symbol**<br>**Unit**||**Min**<br>**Typ.**<br>**Max**|**Comment**|
|Nominal primary AC current<br>Nominal primary DC current<br>Measuring range<br>Nominal secondary voltage<br>Transfer ratio<br>Output resistance|IPN AC<br>Arms<br>IPN DC<br>A<br>ˆIPM<br>A<br>VO<br>V<br>k<br>A/V<br>Ω||500<br>-500<br>500<br>-750<br>750<br>-2<br>2<br>250<br>250<br>49<br>50<br>51|Refer toFig. 2for derating<br>Refer toFig. 2for derating<br>Refer toFig. 2for derating<br>At nominal primary DC current<br>Iprimary/Vsecondary|
|Linearity error|_ϵ_L|ppm|-15<br>_±_10<br>15|ppm refers to reading. SeeFig. 3|
|Ratio error<br>Ratio temperature coeffcient<br>Ratio stability|ppm<br>ppm/K<br>ppm/month||-50<br>_±_20<br>50<br>-3<br>_±_1<br>3<br>_±_10|ppm refers to reading<br>ppm refers to reading<br>ppm refers to reading|
|Offset (including earth feld)<br>Offset temperature coeffcient<br>Offset stability over time|ppm<br>ppm/K<br>ppm/month||-15<br>_±_5<br>15<br>-0.2<br>_±_0.1<br>0.2<br>-0.3<br>0.3|ppm refers to IPN DC<br>ppm refers to IPN DC<br>ppm refers to IPN DC|
|Bandwidth<br>Response time to a step current IPN|f(_±_3dB)<br>MHz<br>tr<br>µs||10<br>1|Small signal. SeeFig. 4<br>To 90% of step current|
|Total accuracy without offset<br><10 Hz<br><100 Hz<br><1 kHz<br><10 kHz<br><100 kHz<br><1MHz<br><10MHz|_ϵ_tot||_% of reading + % of full scale_<br>0.005 + 0.0015<br>0.02 + 0.0015<br>0.1 + 0.0015<br>0.25 + 0.0015<br>0.5 + 0.002<br>1 + 0.003<br>30 + 0.005|Full scale refers to IPN DC.<br>For details, seeReading and full<br>scale<br>For other frequencies, seeLinear<br>interpolation of accuracy<br>specifcation.|
|Phase shift<br><10 Hz<br><100 Hz<br><1 kHz<br><10 kHz<br><100 kHz<br><1MHz<br><10MHz|||0.01°<br>0.01°<br>0.15°<br>0.15°<br>1°<br>6°<br>60°|Without phase compensation<br>Using 2 m RG58 coax cable<br>SeeFig. 4<br>SeeBNC Cable Lengthfor details|
|RMS noise<br><10 Hz<br><100 Hz<br><1 kHz<br><10 kHz<br><100 kHz|ppm rms||0.1<br>0.2<br>0.3<br>1<br>0.3<br>1<br>0.3<br>1<br>2<br>4|ppm refers to IPN DC|
|Peak-to-peak noise<br><10 Hz<br><100 Hz<br><1 kHz<br><10 kHz<br><100 kHz|ppm p-p||1<br>4<br>4<br>7<br>30|ppm refers to IPN DC|
|Fluxgate excitation frequency<br>Power supply voltages<br>Power supply AC input frequency<br>Power supply AC nominal current|fexc<br>kHz<br>Vrms<br>Hz<br>A||31.25<br>85<br>265<br>50<br>60<br>0.3|50-60 Hz|
|Offset change with external magnetic feld|ppm/mT||1.3<br>3.5|ppm refers to nominal current|



1 ppm nominal = 2 _µ_ V secondary voltage. 

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**DW500UB-2V** 

## **Linearity error** 

Linearity error is defined as the deviation from a straight line. The straight line is a linear regression trend line based on the least squares method of the measurement points from 0 to positive max current and another trendline is calculated from 0 to negative max current. The difference between each measured point and the linear trend line is the linearity error. The linearity error _ϵ_ L can be expressed as (1), where Ireading is the measurement result and Ifitted is the regression value. 

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0<br>Measurement<br>Trendline<br>0<br>Reference Reference<br>Reading<br>Linearity error<br>**----- End of picture text -----**<br>


Figure 1: Linearity error definition 

## **Reading and full scale** 

Reading is the actual value measured at a given time. Full scale is the rated nominal value of the device. If a given current Ireading is measured, the total accuracy is calculated as (2). Example: A 500 A rated device has a specification of 0.005% + 0.0015% (reading + full scale) at < 10 Hz, plus an offset of 0.001 % (of full scale). The device is measuring (reading) 10 A dc, and the accuracy is calculated as (3). 

_ϵ_ tot = _ϵ_ reading _·_ Ireading + ( _ϵ_ fullscale + _ϵ_ offset) _·_ IPNDC (2) _ϵ_ tot = 0.005% _·_ 10A + (0.0015% + 0.001%) _·_ 500A = 13mA (3) 

## **Primary and secondary current/voltage** 

The secondary current IS or voltage VS is calculated by using the transfer ratio k, as in (4). 

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If the accuracy at a specific frequency is required, it is possible to use linear interpolation between known points. If the frequency f is f1 < f < f2 and the accuracy at the frequency _ϵ_ (f) is _ϵ_ (f1) < _ϵ_ (f) < _ϵ_ (f2), then the accuracy at f is found as (8). 

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1000 30<br>Unit 1 Unit 2 Unit 3<br>20 Unit 4 Unit 5 Unit 6<br>100 10<br>0<br>10 25°C –10<br>45°C<br>–20<br>60°C<br>1 –30<br>10 Hz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz<br>Frequency<br>Current (A)<br>–500–400–300–200–100 0 100 200 300 400 500<br>Linearity error (ppm)<br>Primary current (Arms)<br>**----- End of picture text -----**<br>


Figure 2: Maximum continuous primary current vs. frequency 

Figure 3: Linearity error of 6 samples 

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4 60°<br>2 40°<br>0 20°<br>-2 0°<br>-4 Gain -20°<br>Phase<br>-6 -40°<br>Phase (compensated)<br>-8 -60°<br>10 Hz 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz<br>Frequency<br>Phase<br>Magnitude (dB )<br>**----- End of picture text -----**<br>


Figure 4: Frequency characteristics with 2m RG58 cable. See Phase Compensation for details. 

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0.05 0.05°<br>0.04 Gain 0.04°<br>0.03 Phase 0.03°<br>0.02 0.02°<br>0.01 0.01° 2 3<br>0 0° 1 0 4<br>-0.01 -0.01° 6 5<br>-0.02 -0.02°<br>-0.03 -0.03°<br>-0.04 -0.04°<br>-0.05 -0.05°<br>0 1 2 3 4 5 6<br>Conductor position<br>Difference from center position (%)<br>**----- End of picture text -----**<br>


Figure 5: Impact of conductor position at 100 kHz 

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## **Isolation specifications according to IEC 61010-1** 

- When using _REINFORCED insulated_ wire, all wiring must be insulated for the highest voltage used. When using _BASIC insulated_ or _uninsulated_ wire, follow the specified voltages in the table below: 

|**Parameter**|**Parameter**|**Unit**|**Value**|
|---|---|---|---|
|Clearance<br>Creepage distance<br>||mm<br>mm<br>|11.5<br>12<br>|
|Comparative tracking index (CTI)||V|> 600|
|Continuous working voltage according to IEC 61010-1 with:<br>_Uninsulated_wire:<br>Non mains<br>CAT II (dc and rms)<br>CAT III (dc and rms)<br>_BASIC insulated_wire:<br>Non mains<br>CAT II (dc and rms)<br>CAT III (dc and rms)||V|1000<br>1000<br>600<br>2000<br>1000<br>1000|
|Transient voltage according to IEC 61010-1 with:<br>_Uninsulated_wire:<br>Non mains<br>CAT II<br>CAT III<br>_BASIC insulated_wire:<br>Non mains<br>CAT II<br>CAT III||V|5000<br>9500<br>9500<br>8000<br>6000<br>8000|



- Do not connect the transducer to signals or use for measurements within Measurement Category IV, or for measurements on MAINs circuits or on circuits derived from Overvoltage Category IV which may have transient overvoltages above what the product can withstand. The product must not be connected to circuits that have a maximum voltage above the continuous working voltage, relative to earth or to other channels, or this could damage and defeat the insulation. 

## **Environmental and mechanical characteristics** 

|**Parameter**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|
|Altitude<br>Usage<br>Pollution degree<br>Operating temperature range<br>Storage temperature range<br>Relative humidity<br>Mass|m<br>°C<br>°C<br>%<br>kg|-30<br>-40<br>20|2.5|2000<br>2<br>60<br>85<br>80|Designed for indoor use<br>Non-condensing<br>Including carrying case and cables|



Connections: Mains AC cable and BNC connector Standards: EMC: EN 61326-1:2013-2021 Cleaning: The transducer should only be cleaned with a damp cloth. No detergent or chemicals should be used. 

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Temperature: 

When multiple primary turns are used or high primary currents are applied the temperature around the transducer will increase, please monitor to ensure that the maximum ratings are not exceeded. It is recommended to have minimum 1 mm[2] per ampere in the primary bus bar. 

## **Transducer Connection - Control Cable** 

Connect the control cable to the circular connector on the front of the control box. 

## **Mains Connection via C7 Cable** 

Use the supplied mains cable to connect mains power to the control box. The control box is designed for using universal mains 100-240Vac, 50-60Hz. The product is designed as a Class II product, meaning that it is intended to be used without a safety earth connection. 

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Ro<br>+<br>V BNC<br>–<br>Chassis<br>**----- End of picture text -----**<br>


Figure 6: BNC shield and chassis connection 

## **Mounting** 

## **Chassis and Shield Connection** 

The chassis of the control box is electrically connected to the sensor head aluminium housing and the BNC shield, see Fig. 6. The screw terminal on the backside of the control box is an optional shield connection reference. This connection may be used if the user wishes to connect the chassis of the control box to an external reference point. For best high frequency performance when using the shield reference, it is recommended to connect the shield reference only to the same physical reference point/GND point as the measurement equipment to which the BNC cable is connected. 

The unit can be installed into a fixed installation using the designated mounting holes – see Fig. 8 in the datasheet for drawings of the unit. The mounting holes are the same as used to fasten the rubber feet on the bottom of the control box – the rubber feet can be removed for fixed installation use. 

## **Power on LED** 

The Power On LED is indicated with this symbol . When the LED is ON (green light) it means that mains power is connected, and the control box is powered. 

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## **Status LED** 

The Status LED is indicated with this symbol . When the LED is ON (green light) it means that the cable to the transducer is connected, and the unit is ready for measurements. If the LED is OFF (no green light): 

For a typical RG58 cable, the signal velocity is around v = 198 _·_ 10[6] m/s corresponding to a delay of 10.1 ns/m. 

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At 1 MHz with 2m RG58 cable: 

- The cable from the transducer to the control box might not be connected 

- The current is out of the measurement range 

- Current have been applied to the busbar before powering the unit 

- An internal error has occurred 

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At 10 MHz with 2m RG58 cable: 

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## **Control Cable** 

It is important that the 3m cable from the transducer must be connected to the control box before current is applied to the busbar under measurement. The unit may fail if high current is applied before connecting the cable to the powered control box. 

## **Signal Output – BNC** 

The voltage output signal from the transducer is available from the BNC-type connection with an internal output resistance of 50Ω. It is recommended to use a high impedance (≥1MΩ) analyzer for best precision. 

## **BNC Cable Length** 

The standard length of the supplied coaxial BNC cable type RG58 is 2m. Other lengths of BNC connection cable may be used. The length of the cable affects the high frequency phase response (delay). Choose a high quality RG58-type coaxial cable if other lengths are required. Phase response or time delay with longer or shorter cables may be compensated by the attached receiving analyzer. BNC cable phase error in degrees (using high impedance input) is calculated as in (9). Where f is the frequency in Hz, l is the cable length in meters and v is signal velocity of the cable. 

## **Phase Compensation** 

The DW500UB-2V has a phase shift of around -4.5°at 1 MHz using a 2m RG58 coax cable. This corresponds to a time delay of 12.5 ns. For the most accurate phase compensation, use the measured phase delay of the specific unit. 

## **Isolation Plastic Ring** 

The current transducer is constructed with an isolation plastic ring to ensure specified insulation to the busbar. It is possible to remove the plastic isolation ring to obtain a larger aperture by clicking the two parts apart with two fingers. 

IMPORTANT: If the isolation ring is removed, the user must � ensure proper electrical insulation of the busbar to meet the safety requirements to avoid electric shock. The isolation ring can be stored in the product carrying case. 

## **Measuring at High Frequencies** 

See application note on high frequency current measurement on our website: https://danisense.com/wp-content/uploads/Current -Measurements-at-High-Frequencies.pdf 

All information subject to change without notice 

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**----- Start of picture text -----**<br>
 Ø24 with insulation tube<br>Ø30 without insulation tube<br> 82   3000<br>| |a ——<br> 128<br>2x M4 4x M4 - Slotted holes<br>0 6 ° as<br>: 8 EE<br>0 ° @o°<br> 38<br> 36,8   74,8<br>Figure 7: Dimensions of sensor head. Tolerance is 0.3 mm<br>92,2<br>direc<br>current  43<br>Positive<br> 65<br> 67,2<br> 73,5<br>**----- End of picture text -----**<br>


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 50,4<br> 162,5<br> 6,4<br> 17,8  Positive current direction<br>Is identified by an arrow on the transducer label<br> 127<br>: Mounting instructions<br>Base plate mounting: 4 slotted M4 holes<br>Back mounting: 2 threaded M4 holes<br>Control box : 4 threaded M4 holes or rubber feet<br>Ye) ie.<br>Fastening torque: 5.5 Nm<br> 17,8<br> 110   110   74,5<br> 17,8<br>**----- End of picture text -----**<br>


Figure 8: Dimensions of control box. Tolerance is 0.3 mm 

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**DW500UB-2V** 

## **Declaration of Conformity** 

Danisense A/S Malervej 10 

DK-2630 Taastrup Denmark 

Declares that under our sole responsibility that this product is in conformity with the provisions of the following EC Directives, including all amendments, and with national legislation implementing these directives: 

Directive 2014/30/EU Directive 2014/35/EU 

And that the following harmonized standards have been applied 

EEN 61010-1 (Third Edition):2010, EN 61010-1:2010/A1:2019 EN 61010-2-030:2021/A11:2021 EN 61326-1:2013 

All DANISENSE products are manufactured in accordance with RoHS directive 2011/65/EU. Annex II of the RoHS directive was amended by directive 2015/863 in force since 2015, expanding the list of 6 restricted substances (Lead, Hexavalent Chromium, PBB, PBDE and Cadmium) 

Danisense follows the provision in EN 63000:2018 

Place Taastrup, Denmark 

Date Henrik Elbæk 2022-03-15 

All information subject to change without notice 

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