The **VPS220-R** is a high-voltage industrial probe set designed primarily for use with **Fluke ScopeMeter** test tools (specifically the 190 Series). It is engineered for heavy-duty electrical troubleshooting. Below is a breakdown of its electronic specifications, components, and safety features. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Attenuation Ratio** | 10:1 (Fixed) | | **Bandwidth** | 200 MHz | | **Max. Input Voltage** | 1000 V CAT II / 600 V CAT III | | **Input Resistance** | 10 MΩ | | **Input Capacitance** | 18.5 pF | | **Cable Length** | 1.2 Meters (approx. 4 feet) | | **Color Coding** | Red (indicated by the "-R" suffix) | --- ### 2. Main Electronic Components The VPS220-R is a **passive high-impedance probe**. Its internal circuitry consists of several critical stages: #### A. The Probe Head (The Tip) The tip contains a precision resistor-capacitor (RC) network. Because it is a 10:1 probe, it uses a **9 MΩ resistor** in series with the oscilloscope's **1 MΩ input** to create a voltage divider. This reduces the signal voltage by a factor of 10, protecting the scope and increasing the input impedance. #### B. The Compensation Box (BNC Connector) Located at the end of the cable that plugs into the oscilloscope, this box contains a **variable trimmer capacitor**. * **Function:** It allows the user to match the probe's capacitance to the specific input capacitance of the oscilloscope channel. * **Why it matters:** Proper adjustment ensures a flat frequency response, preventing "overshoot" or "rounding" of square waves. #### C. The Coaxial Cable Unlike standard copper wire, the internal wire of the VPS220-R is often made of high-resistance wire (like Monel) to dampen high-frequency ringing and reflections within the cable itself. --- ### 3. Safety & Design Features The VPS220-R is built for industrial environments where high energy transients are common. * **Reinforced Insulation:** The parts are double-insulated to meet **CAT III 600V** safety standards. * **Integrated Grounding:** It typically includes a heavy-duty ground lead with a large alligator clip to ensure a solid reference point, which is critical for reducing electronic noise at 200 MHz. * **Shrouded BNC:** The connector is fully shielded to prevent accidental contact with high-voltage signals while plugging into the meter. --- ### 4. Application Use-Case Because of the **200 MHz bandwidth**, this probe is suitable for: * Analyzing Variable Frequency Drives (VFDs). * Troubleshooting switching power supplies. * Capturing fast rise-time pulses in industrial control systems.