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PMK | AC/DC Current Probes

IWATSU® Current Probe Series SS-500

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The IWATSU® SS-500 Series offers high-performance clamp-type current probes designed to measure current from microamps to hundreds of amps without breaking the circuit. With bandwidths up to 120 MHz, excellent noise performance, and support for small to large conductors, it's ideal for ripple current observation, switching current measurement, and general-purpose use across R&D, production, and power analysis..

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The IWATSU® SS-500 current probe series enables non-invasive, accurate current measurement by clamping around a conductor and detecting its magnetic field. This is particularly useful for live circuits or where power interruptions are not possible.

The series supports both low-current high-precision applications and higher current switching measurements. With models offering bandwidths from DC up to 120 MHz and low noise floors, it is ideal for everything from power supply ripple analysis to switching current spikes in high-frequency circuits.

Its design provides galvanic isolation, enhancing safety and signal fidelity. The high signal-to-noise ratio (SNR), combined with 10x output gain, makes it suitable even for 100 μA-level measurements.

Common applications include:

  • Power electronics development

  • Ripple current monitoring

  • Switched-mode power supply (SMPS) debugging

  • Low-current signal integrity analysis

  • High-speed switching waveform validation

  • Non-intrusive clamping: No need to break the circuit

  • Wide bandwidth range: DC to 120 MHz (model dependent)

  • Low noise, high sensitivity for ripple and microcurrent capture

  • Selectable measurement ranges: 30 A, 5 A, 0.5 A

  • Supports conductor sizes: 5 mm to 20 mm diameter

  • Excellent S/N ratio for high-accuracy microcurrent observation

  • DC current observation with galvanic isolation

  • Ideal for viewing 100 μA ripple, 1 mA microcurrent waveforms, and switching current transients

Model Bandwidth Max Current (rms) Key Features
SS-521 DC to 120 MHz 5 A High bandwidth, low noise
SS-520 DC to 50 MHz 5 A Optimized for ripple/microcurrents
SS-531 DC to 120 MHz Up to 500 A (varies) For large currents and cables

 

Parameter Value
Measurement Ranges 0.5 A, 5 A, 30 A (model dependent)
Min. Observable Current ~100 μA (with high-res oscilloscope)
Conductor Diameter 5 mm to 20 mm
Noise Performance Low-noise, high SNR for clean signal capture
Output Impedance 50 Ω (standard oscilloscope compatibility)
Interface BNC output