PEM LFR Dual-Range AC Current Probe
The PEM AC Current Probes utilize a Rogowski Coil and Matched Analog Integrator to provide accurate non-contact, measurement of AC currents over a very broad frequency range. These flexible “clip-around” Current Probes have very low insertion impedance compared to Current Transformers, (CT), or Hall Current Transducers, are easy to insert in confined spaces and are not damaged by over-current surges. They can be used for measuring ac, pulse or transient current waveforms. Since the PEM Current Probes have no magnetic core they can be used to measure ac current on a conductor with high dc current or in the presence of a high dc magnetic field.
LFR Dual Range AC Current Probe
A dual range, clip-around, battery powered Rogowski probe for general purpose ac power measurements. The LFR has a 10:1 switch selectable current ratio to give a wide dynamic range in a single probe.
Features
- Peak Current ratings from 60A to 60kA
- Robust, flexible, clip-around coils
- Integrator included with Rogowski Coil to provide an analog signal accurately proportional to primary current in amplitude and phase
- High voltage isolation and common mode rejection
- Measure ac current even in the presence of a high dc current
- Not influenced by high dc magnetic fields
- Bandwidth from 0.1Hz to 1MHz
- No I*t limitation as with CT
- Both battery (4xAA) and external DC power supply
- CE marked
- Special cryogenic versions
- Special long coil versions
Applications
- Monitoring current waveforms in semiconductor switches
- Development, test and servicing of power electronic equipment.
- Pulsed Power capacitor discharge and magnetic accelerator current measurements
- Welding, motor drive, generator, currents
- Ground currents in rotating machine shafts
- Induction heating and plasma current measurements
- Measuring AC currents in the presence of large DC currents
- Fault monitoring, circuit breaker interruption and lightning strike currents
- Monitor Battery and Capacitor Ripple Current
Tech Support
- LFR Datasheet – Revised March 2018
- AC/DC Wall Plug Power Adaptors
- CWT/LFR-YK Power Cable, 0.5m, For Yokogawa Oscilloscopes and ScopeCorders
Instructions for Use
Mechanical Dimensions
- LFR Technical Notes
- “High Performance Rogowski Current Transducers”, W. F. Ray and C. R. Hewson
- “Next-Generation Current Probes for High-Speed and High Power-Density Applications”, Dr Chris Hewson, Power Electronic Measurements Ltd
- LFR03 Noise Measurements
- “Power Integrity” by Steve Sandler. See Chapters 5: Probes and 7: Measuring Impedance for applications using PEM Rogowski Coils (purchase of book required).
- Application Note: Transducer Termination Impedance – Low and High Frequency Analysis
Pricing
Product Configurator:
Select product options from drop-down menus to quote standard products not normally in stock. For fully custom products, fill in the message box below.
Order Code for LFR: Type Battery / Coil Circumference
For example: LFR03/3 B/700
For descriptions of the possible selections, please see the Specifications above.
LFR Dual Range AC Current Probe
Part No. | Description | Price | In Stock |
---|---|---|---|
LFR03/3 B/300 | AC Current Probe, 100/10mV/A, 60A/600A, 0.45Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 300mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $620.00 | |
LFR06/6 B/300 | AC Current Probe, 50/5mV/A, 120A/1.2kA, 0.23Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 300mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $620.00 | |
LFR1/15 B/500 | AC Current Probe, 20/2mV/A, 300A/3kA, 0.15Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 500mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $620.00 | |
LFR3/30 B/500 | AC Current Probe, 10/1mV/A, 600A/6kA, 0.10Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 500mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $770.00 | |
LFR6/60 B/500 | AC Current Probe, 5/0.5mV/A, 1.2kA/12kA, 0.08Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 500mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $770.00 | |
LFR15/150 B/700 | AC Current Probe, 2/0.2mV/A, 3kA/30kA, 0.07Hz/1MHz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 700mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $810.00 | |
LFR30/300 B/1000 | AC Current Probe, 1/0.1mV/A, 6kA/60kA, 0.07Hz/1Mhz, Alkalai battery 1x9V, 2.5m cable coil to integrator, 1000mm coil circumference length, 8.5mm cross section. Includes US21S power supply. | $810.00 |
LFR Accessories
Part No. | Description | Price | In Stock |
---|---|---|---|
US21S | Power Supply, 120VAC, 12VDC, 300mA with a 2.1/2.5mm socket. Power disconnects battery when plugged into the integrator. | $40.00 | |
PowerCableYK21 | Yokogawa compatible power cord, 0.5m, supports all PEM units fitted with a 2.1mm DC power socket. | $60.00 | |
BNC-BP | Â 0.5m BNC to banana plug output cable | $30.00 |
Re-Calibration
Note: Calibration on new product is discounted 50%.
New PEM Rogowski Coils include a Manufacturer’s Calibration Certificate at no extra charge.
Note: LFR calibration can be done at one or both ranges, second range is 50% off first.
Part No. | Description | Price | In Stock |
---|---|---|---|
OL-17025-500A-AC | 17025 Accredited Calibration, Current Transducer, Full-scale Range between 0 and 500Arms, 50-400Hz, https://gmw.com/quality/ | $300.00 | |
OL-17025-500A-AC-ADD | Calibration of Additional Transducer | $150.00 | |
OL-17025-2000A-AC | 17025 Accredited Calibration, Current Transducer, Full-scale Range between 501 and 2000Arms, 50-400Hz, https://gmw.com/quality/ | $400.00 | |
OL-17025-2000A-AC-ADD | Calibration of Additional Transducer | $200.00 | |
OL-17025-8000A-AC | 17025 Accredited Calibration, Current Transducer, Full-scale Range between 2001 and 8000Arms, 50-400Hz, https://gmw.com/quality/ | $500.00 | |
OL-17025-8000A-AC-ADD | Calibration of Additional Transducer | $250.00 |
Repair
Part No. | Description | Price | In Stock |
---|---|---|---|
RECOIL-LFR | Recoil (replace damaged coil) and Recalibrate
| $560.00 |
Terms and Conditions
Quantity Discount Schedule:
Quantity | 1 – 9 | 10 – 24 |
Discount | 0% | 5% |
Terms and Conditions:
Prices above are for domestic deliveries to Canada, USA and Mexico only.
Prices are expressed in U.S. Dollars, FCA San Carlos, California.
Prices are subject to change without notice.
Higher quantity and OEM discounts are available.
Payment:
Visa, MasterCard, Amex, Prepayment before shipment, or Net 30 days (subject to credit
acceptance).
Delivery:
Items in stock shipped next business day. All other items are 8-10 weeks.