Home Iwatsu | Probes FF-1500 Optical Isolation Probe
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Iwatsu | Probes

FF-1500 Optical Isolation Probe

Now includes NABL Calibration Certificate.

High-speed, high-voltage optical isolation probe with >1.5 GHz bandwidth, ±60 kV common-mode voltage, and 180 dB CMRR—ideal for accurate differential signal measurements in GaN/SiC-based power circuits..

  • Detail
  • Special Features
  • Specification

The FF-1500 Optical Isolation Probe is a next-generation measurement solution built to handle today’s fastest and highest-voltage switching environments. It’s designed specifically for wide bandgap semiconductor applications like GaN and SiC-based inverters, motor drives, and power conversion systems. This precision probe enables reliable signal capture in environments where common-mode noise or ground referencing would otherwise cause instability or error.

The system comprises a probe head, powered by a standard 18650 rechargeable Li-ion battery (sold separately), and an interface box, connected via a 2-meter optical fiber link for complete galvanic isolation. The probe head integrates a high-bandwidth input amplifier and EO converter, and supports different probe tip cables to match measurement range needs—from ±1 V to ±50 V.

The output is delivered via a standard BNC connector to any 50 Ω oscilloscope input. The design ensures exceptional signal fidelity, even under demanding differential and common-mode conditions. It’s ideal for non-ground-referenced signals, such as high-side gate drives and current measurements using shunt resistors in switching power supplies.

  • Ultra-wide bandwidth: >1.5 GHz

  • Industry-leading 180 dB CMRR (DC), ensures signal integrity

  • Handles up to ±60 kV common-mode voltage

  • Supports multiple differential voltage ranges via interchangeable probe tip cables

  • Optical fiber isolation between probe head and interface box

  • Universal BNC output compatible with any oscilloscope

  • Ultra-low noise and <2 mV RMS with 1X input

  • Long-lasting battery-powered operation (>30 hours typical)

  • Probe tip compatibility with low Ls, Cp MMCX(P) connectors

  • Designed for high-side gate signal and shunt-based current sensing

Electrical Performance

  • Bandwidth: >1.5 GHz (typical)

  • Rise Time: <280 ps

  • Common-Mode Voltage Range: ±60 kV (DC + AC peak)

  • Input Attenuation Options: 1×, 10×, 25×, 50× via probe tip cables

  • Maximum Differential Input: Up to ±50 V (destructive), up to 100 V (non-destructive)

  • CMRR:

    • DC: >180 dB

    • 1 MHz: Up to 165 dB

    • 100 MHz: Up to 110 dB

    • 1 GHz: Up to 90 dB

  • Input Impedance:

    • Up to 10 MΩ // 2 pF depending on cable

  • DC Accuracy: <2% ± offset

  • Noise Floor: <2 mV RMS (1× input)

  • Propagation Delay: 15 ns (typical with 2 m fiber)

  • Output: DC coupled, 50 Ω termination

Mechanical & Power

  • Power Supply: 18650 Li-ion battery with protection circuit (sold separately)

  • Battery Life:

    • 30 hrs at room temperature

    • 4 hrs at 50°C

  • Connectivity:

    • SMA input on probe head

    • BNC output on interface box

Environmental Ratings

  • Operating Temperature:

    • Probe Head: 0°C to +50°C

    • Interface Box: 0°C to +40°C

  • Storage Temperature:

    • Up to +71°C for probe & interface box

    • Up to +85°C for probe tip cables

  • Relative Humidity:

    • Up to 85% non-condensing

  • Altitude:

    • Operation: 3000 m

    • Non-Operating: 15,000 m

Safety & Compliance

  • Pollution Degree: 2

  • Laser Safety: Laser Class 1 IEC/EN 60825-1:2014

  • Certifications: RoHS, WEEE

Ordering Process

  1. Select base probe: FF-1500-INT (includes fiber cable and color ring)

  2. Choose probe tip cable (1×, 10×, 25×, 50× attenuation)

  3. Add connectivity accessories and adapters

  4. Choose a probe control unit (e.g., PS-02)

  5. Add positioning system if required