Current probes for oscilloscopes, power analysers and wattmeters
Single phase clip around / Clip on flexible AC current sensing probes
Converting ac current to an isolated voltage (Instantaneous)
For fast & easy installation in confined spaces

 Powertek
UK Tel: +44 1788 519911
US Tel: +1 631 744 0294
Email : info@powertekuk.com

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The LFR ac current probe has been designed to have market leading low frequency performance, meaning low phase shift and low noise. This compact, low cost, clip-around probe is both flexible and dual-range, and is optimized to give minimal phase measurement error at frequencies from 45Hz to 20kHz and have a very low noise floor

The LFR current sensors convert ac current to an isolated 0-6V voltage signal.  The available LFR ranges are 0-60A to 0-60,000Apk.  The LFR offers accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted waveshapes - using a flexible clip-on sensing coil.

Typical applications:  Extending current ranges of power analyzers, wattmeters, oscilloscopes, data loggers, where energy and current monitoring is required.  Typical loading situations are ac/dc Wind turbines, VFD motor drives, arc welding, power conversion and power distribution.  For all LFR models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied.   All LFR current sensors use UL or CSA approved materials.

  • Peak Current ratings from 60A to 60kA
  • Dual Sensitivity set to give ±6Vpk output (e.g. 10mV/A for ±600Apk AND 1mV/A for ±6000Apk, switch selectable)
  • Typical Bandwidth 0.1Hz to 1MHz
  • Robust, flexible, clip-around coils
  • Standard lengths 300, 500, 700 or 1000mm
  • Custom lengths up to 5m
  • Coil thickness 8.5mm
  • Insulation 2kV pk
  • Both battery (1x9V PP3) and external DC power supply 
  • CE marked

 

 

LFR Specifications
Type Sensitivity

(mV/A)

 Peak current

(A)

 Noise typ.

(mV rms)

 Phase error at 50Hz

max.(deg.)

 LF (3dB) bandwidth typ. (Hz) fL Phase error in degrees at 20kHz

typ. (deg)

 Peak di/dt

(kA/us)
x10 x1 x10 x1 x10 x1 Coil 300mm Coil 700mm x10 x1
LFR 03/3 100.0 10.0 60.0 600.0 3.0 1.0 <0.85° 0.45 1.8° 3.0° 0.015 0.25
LFR 06/6 50.0 5.0 120.0 1.2k 3.0 1.0 <0.50° 0.23 1.8° 3.0° 0.03 0.5
LFR 1/15 20.0 2.0 300.0 3.0k 2.0 1.0 <0.35° 0.15 1.8° 3.0° 0.1 1.2
LFR 3/30 10.0 1.0 600.0 6.0k 2.0 1.0 <0.25° 0.10 1.8° 3.0° 0.2 2.5
LFR 6/60 5.0 0.5 1.2k 12.0k 2.0 1.0 <0.20° 0.08 1.8° 3.0° 0.4 5.0
LFR 15/150 2.0 0.2 3.0k 30.0k 1.0 0.5 <0.18° 0.07 1.8° 3.0° 0.9 6.0
LFR 30/300 1.0 0.1 6.0k 60.0k 1.0 0.5 <0.18° 0.07 1.8° 3.0° 1.8 6.0

 

High Freq Bandwidth -3dB 1.0 MHz for coil length 300mm
600kHz for coil length 700mm
Typical accuracy ±0.3% with conductor centered in sense coil (Rogowski loop).  Accuracy variation with conductor position is ±1%
Typical linearity ±0.05% (full scale)
DC Offset ±2.5mV
Absolute maximum values of di/dt in kA/uS(value must not be exceeded) Peak 6.0
RMS 0.3 @ 70°C

 

Coil and cable

1 COIL CIRCUMFERENCE  (mm) 300, 500, 700 or 1000mm
2 COIL CROSS SECTION  (mm) 8.5mm (14mm with sleeve)

14.0mm (with protection sleeve)

 
PEAK COIL VOLTAGE ISOLATION 2kV
Safe peak working voltage to earth. The coils are flash tested at 4kVrms for 60 seconds. The coil is supplied with a removable silicone sleeve for additional mechanical protection. Information about continuous use of the coils at high voltage can be obtained from Powertek.
TEMPERATURE RANGE (oC) -20°C to 70°C
For de-rating due to temperature cycling please consult Powertek
3 CABLE LENGTH (from box to coil) 2.5 m

 

Integrator
Power Supply Single 9V PP3 battery - battery life typically 50 hours.  Also supplied with 2.1 / 2.5mm socket for 12V to 24Vdc ( ±10% ) DC supply - (Quiescent current 10mA).
Optional power supply available from Powetek.
Battery inoperative with DC supply present.
Integrator Box Dimensions H = 28mm, W = 65mm, D = 90mm
Output Socket BNC (output impedance 50ohm - unit supplied with 0.5m BNC-BNC coaxial cable) Optional 0.5m BNC to banana plug available from Powertek.
Min. output loading 100k (for rated accuracy).
Temperature Range -10°C to 55°C


 

LFR current sensor order codes

Type & model / Coil circumference
LFR 06/6 / 700 mm
In this example supplied as 120A & 1200Apk, 0-6V output with 12-24Vdc power and 700mm coil length

* to meet CE / UL safety requirements, an external power adapter is supplied for 125Vdc, 110Vac and 230Vac options


All products have CE, IEC, EN, ASME or BS approvals.
 

Also see our RCT series flexible (split core) current sensors for permanent installation

rct_rms.jpg (35590 bytes)              
RCTi / RCTrms single phase                                 RCTi / RCTrms Three phase
 

rct01.jpg (8652 bytes)          
       Includes signal conditioner and power                TA5V-xA 1A or 5A adapter                       

Get pdf data sheets:       RCTi single phase      RCTi-3ph Three Phase

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