I-prober 520 Positional current probe

The I-prober 520 achieves something radically new in current measurement technology. Designed to observe and measure currents in PCB tracks and other conductors where conventional current probes can’t be used, this innovative tool can access areas such as captive wires in components, integrated circuit legs, and PCB ground planes. Unlike traditional methods that require breaking the circuit or encircling the conductor with a magnetic loop, the I-prober 520 measures currents from DC up to 5MHz simply by placing its insulated tip onto the conductor.

Key Features

• Insulated Probing: Measure currents directly from the conductor without breaking or surrounding the circuit.
• Versatile Application: Suitable for PCB tracks, component leads, and ground planes.
• Wide Dynamic Range: Capable of measuring currents from 10mA to 20A peak to peak.
• Broad Bandwidth: Operates from DC to 5MHz, making it ideal for various applications.
• Low Noise: Maintains a noise figure of less than 6mA RMS at full bandwidth.
• Safety Rated: Certified to 300V Cat II and 600V Cat I for safe usage in various environments.
• Oscilloscope Compatibility: Easily connects to any oscilloscope.
• High Accuracy: Functions as a general-purpose H-field probe.
• Dual Functionality: Converts to a standard ‘closed magnetic circuit’ current probe for more traditional measurements.

Unique Capabilities

• No Circuit Disruption: Measures currents without breaking or encircling the conductor, minimising disturbance to circuit conditions.
• Access Confined Spaces: Effective in confined and hard-to-reach areas.
• Surface Mount Components: Measures current into surface mount components and IC legs.
• Ground Plane Observation: Capable of observing currents flowing within ground planes.
• High Voltage and Temperature: Suitable for use on high voltage conductors and in high-temperature areas.

Advanced Sensor Technology

The I-prober 520 uses a patented miniature fluxgate magnetometer, a highly advanced sensor technology. Unlike conventional fluxgate magnetometers, which are large and limited in bandwidth, the sensor within the I-prober 520 is submillimetre in size and uses an excitation frequency of several tens of MHz. This results in a sensor with a DC to 5MHz bandwidth, low noise, and a wide dynamic range.

Practical Application in PCB Track Current Measurement

Measuring current in PCB tracks has always been challenging due to the impracticality of breaking the track or encircling it with a magnetic circuit. The I-prober 520 solves this by sensing the magnetic field in close proximity to the track, allowing precise measurement without circuit disruption. Engineers can now observe and measure currents in high-density PCB designs directly, a crucial capability as electronic designs become more compact and intricate.

Enhanced Measurement Accuracy

The I-prober 520 includes a calibrator within its control box, allowing sensitivity adjustment for different track widths and compensating for other field effects. This ensures accurate current measurement even in complex environments. The control box also features DC offset control and switchable filters to mitigate unwanted interference.

Closed-Loop Current Measurement

For traditional current measurement, the I-prober 520 includes a clip-on toroid assembly. This accessory converts it into a closed magnetic circuit probe, maintaining its wide bandwidth, dynamic range, and low noise while improving accuracy and repeatability.

Minimal Circuit Disturbance and High Safety Standards

The I-prober 520’s low insertion impedance and negligible stray capacitance mean it can observe and measure currents without affecting circuit performance. Safety-rated to 300V CAT II and 600V CAT I, it’s safe for use on circuits with direct AC line connection up to 300V RMS and isolated circuits up to 600V RMS. It can also measure high-temperature PCB tracks and component leads, ensuring reliable performance under demanding conditions.

The I-prober 520 sets a new standard in current measurement for PCB tracks and other challenging conductor environments. Its innovative design, advanced sensor technology, and versatile application capabilities make it an essential tool for professional engineers seeking precise, non-intrusive current measurement solutions. Whether dealing with high-density PCBs or high-voltage circuits, the I-prober 520 delivers unparalleled performance and accuracy.