Repeatable closure
Spring-loaded stainless steel fasteners close a split toroidal core inside a precision-machined aluminum enclosure. The aperture is 32 mm.
SW 9601 A2, 1 kHz–420 MHz, RF Current Measurement Clamp
RF Current Measurement Clamp
Measure RF disturbance currents on cables and cable bundles.
The Schwarzbeck SW 9601 A2 is a shielded split-core RF current transformer covering 1 kHz–420 MHz. It accepts cables up to 31 mm in diameter, connects to 50-ohm instruments through an N-female connector, and includes individual transfer-impedance calibration data.
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SW 9601 A2 Datasheet
SPECIFICATIONS
1 kHz–420 MHzUsable frequency range
31 mmMaximum cable diameter
N female50-ohm interface
Product overview
Designed around the measurement
Application coverage
The manufacturer lists disturbance-current measurements associated with CISPR 16-2-1, ISO 11452-4, RTCA DO-160, MIL-STD-461 G and IEC/EN 61000-4-6.
Unit-specific correction
Use the individual calibration data supplied with the clamp to correct the instrument reading. Published datasheet values below describe the reference response, not the calibration of every unit.
Application details
Convert voltage to current
Logarithmic conversion
At a 50 Ω measurement input: I [dBµA] = U50 [dBµV] − ZT [dBΩ]. Subtract the transfer impedance at the measurement frequency from the measured voltage.
Typical sensitivity
The specification lists approximately 0 dBΩ at 1 MHz and 10 dBΩ at 100 MHz. The detailed published table contains 0.54 dBΩ and 9.75 dBΩ at those frequencies, respectively.
Calibration accessory
The optional CF 9651 fixture supports transfer-impedance and insertion-impedance measurements for this clamp family.
Connection overview
See where it fits.
01Cable disturbance current
02SW 9601 A2 around cable
0350 Ω instrument voltage
04Subtract calibrated ZT current
I [dBµA] = U50 [dBµV] − ZT [dBΩ]. Use the transfer impedance for the actual frequency and clamp.
I [dBµA] = U50 [dBµV] − ZT [dBΩ]
Conversion from the manufacturer datasheet. U50 is the voltage measured across a 50 Ω input.
Technical data
SW 9601 A2 specifications
Ratings, connectors and mechanical details consolidated from the manufacturer’s product page and Rev. A datasheet.
Read the full datasheet| Usable frequency range | 1 kHz–420 MHz |
|---|---|
| Connector | N female; 50 Ω measuring system |
| Typical transfer impedance at 1 MHz | 0 dBΩ |
| Typical transfer impedance at 100 MHz | 10 dBΩ |
| VSWR, specification summary | Typical <1.3; see frequency-dependent plot |
| Maximum conductor current | Approximately 300 A, DC–400 Hz |
| Transformation ratio | 1:2 |
| Maximum line diameter | 31 mm |
| Aperture | 32 mm |
| Dimensions | 104 × 45 × 79 mm |
| Weight | Approximately 600 g |
| Calibration data | Individual transfer-impedance data supplied |
| Optional calibration fixture | CF 9651 |
Original manufacturer figures
Performance curves
Extracted from the datasheet with axes, legends and limit lines intact. Typical curves characterize the device; use the stated specifications and unit calibration where applicable.
Construction & application
Photos, details and test setups
Original figures extracted from the associated datasheet. Open any image to inspect the full-size figure.
Practical questions
Before you specify the product
How do I convert the measured voltage to current?
For a 50 Ω input, subtract transfer impedance in dBΩ from voltage in dBµV to obtain current in dBµA.
Does the typical VSWR apply at every frequency?
The summary lists typical VSWR below 1.3, but the plotted response rises near the top of the range. Consult the full curve for the frequency of interest.
Build the setup
Related products
Components and supporting equipment
- Included: SW 9601 A2 RF current measurement clamp and individual transfer-impedance calibration data.
- Optional: CF 9651 calibration fixture.
- Required for measurement, specified separately: a compatible 50-ohm measuring instrument and suitable N-connector coaxial cable. Apply cable-loss corrections as required by the measurement setup.
Absolute EMC · North American sales
Specify the right setup.
Ask about the SW 9601 A2, compatible accessories and your measurement requirements.
Product inquiries for the United States, Mexico and Canada.
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