Series LFR
  • Series LFR

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Manufacturer: PEM

Series LFR

The LFR is a dual range ac current probe with a flexible,clip-around coil. It can be powered either by a single 9V battery or an external dc supply.
The LFR has market leading low frequency performance, optimised to give minimal phase measurement error from 45Hz up to 20kHz and the lowest possible noise floor. It also has a good high frequency performance e.g. 1.0MHz bandwidth for a 300mm coil.

Technical data

HIGH FREQ. (-3dB) bandwidt:
1.0 MHz (for coil length 300mm)
 
600.0 kHz (for coil length 700mm)
TYPICAL ACCURACY
Calibrated to ±0.3% with conductor central in the Rogowski loop.
 
Calibration certificate supplied. Variation with conductor position in the coil loop typically ±1%
TYPICAL LINEARITY
±0.05%
Offset DC (temp. max 65°C):
± 2.5mV
ABSOLUTE MAXIMUM PEAK di/dt:
6.0 kA/ μ s

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 at
20kHz *2
typ. (deg)		 Peak di/dt
(kA/µs)
x10 x1 x10 x1 x10 x1 300mm 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 3.8 1.8 6.0

Parameters
COIL CIRCUMFERENCE
300, 500, 700 or 1000mm
COIL CROSS SECTION
8.5mm(
 
PEAK COIL VOLTAGE ISOLATION
2kV
 
TEMPERATURE RANGE
-20..+70°C
CABLE LENGTH
2.5m
INTEGRATOR
POWER SUPPLY

Single 9V PP3 battery - battery life typically 50 hours
-plus-
2.1/2.5mm socket for 12V to 24Vdc (±10%) DC supply
- (Quiescent current 10mA)
Optional power supply available from PEM.
Battery inoperative with DC supply present
INTEGRATOR BOX DIMENSIONS
H = 28mm, W = 65mm, D = 90mm
OUTPUT SOCKET
 BNC (output impedance 50W - unit supplied with 0.5m BNC - BNC coaxial cable)
Optional 0.5m BNC to banana plug cable available from PEM
 
MIN. OUTPUT LOADING
100kW (for rated accuracy)
 
TEMPERATURE RANGE
-10..+55°C
 
Catalogue number
Type
* see table above
Coil Circumference (mm)
300, 500, 700, 1000mm
Less
Read more

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The LFR is a dual range ac current probe with a flexible,clip-around coil. It can be powered either by a single 9V battery or an external dc supply.
The LFR has market leading low frequency performance, optimised to give minimal phase measurement error from 45Hz up to 20kHz and the lowest possible noise floor. It also has a good high frequency performance e.g. 1.0MHz bandwidth for a 300mm coil.

Technical data

HIGH FREQ. (-3dB) bandwidt:
1.0 MHz (for coil length 300mm)
 
600.0 kHz (for coil length 700mm)
TYPICAL ACCURACY
Calibrated to ±0.3% with conductor central in the Rogowski loop.
 
Calibration certificate supplied. Variation with conductor position in the coil loop typically ±1%
TYPICAL LINEARITY
±0.05%
Offset DC (temp. max 65°C):
± 2.5mV
ABSOLUTE MAXIMUM PEAK di/dt:
6.0 kA/ μ s

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 at
20kHz *2
typ. (deg)		 Peak di/dt
(kA/µs)
x10 x1 x10 x1 x10 x1 300mm 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 3.8 1.8 6.0

Parameters
COIL CIRCUMFERENCE
300, 500, 700 or 1000mm
COIL CROSS SECTION
8.5mm(
 
PEAK COIL VOLTAGE ISOLATION
2kV
 
TEMPERATURE RANGE
-20..+70°C
CABLE LENGTH
2.5m
INTEGRATOR
POWER SUPPLY

Single 9V PP3 battery - battery life typically 50 hours
-plus-
2.1/2.5mm socket for 12V to 24Vdc (±10%) DC supply
- (Quiescent current 10mA)
Optional power supply available from PEM.
Battery inoperative with DC supply present
INTEGRATOR BOX DIMENSIONS
H = 28mm, W = 65mm, D = 90mm
OUTPUT SOCKET
 BNC (output impedance 50W - unit supplied with 0.5m BNC - BNC coaxial cable)
Optional 0.5m BNC to banana plug cable available from PEM
 
MIN. OUTPUT LOADING
100kW (for rated accuracy)
 
TEMPERATURE RANGE
-10..+55°C
 
Catalogue number
Type
* see table above
Coil Circumference (mm)
300, 500, 700, 1000mm
Less
Read more