Vintage Beckman RF-221-22 RF Probe, designed for use with compatible 22 MΩ input impedance meters.
The RF-221 is a peak-detecting RF probe that extends AC voltage measurement capability into the radio-frequency range. According to Beckman documentation, the probe operates from 2 kHz to 200 MHz and provides a DC output calibrated to correspond to the RMS value of a sine-wave input.
This example is marked “MODEL RF-221-22 – FOR 22 MEGΩ IMPEDANCE METERS” and has an approximately 85 cm cable.
The probe includes the attached test tip, ground lead/clip and meter connection as pictured.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Beckman Instruments |
| Model | RF-221-22 |
| Series / Base Model | RF-221 |
| Type | RF Probe |
| Detection | Peak sensing, RMS calibrated |
| Frequency Range | 2 kHz–200 MHz |
| Maximum Reading | 25 Vrms |
| Input Impedance | 1.5 MΩ in parallel with 7 pF |
| Meter Compatibility | 22 MΩ impedance meters |
| Accuracy, 2 kHz–10 MHz | ±(1% input + 50 mV) |
| Accuracy, 10–100 MHz | ±1 dB |
| Accuracy, 100–200 MHz | ±6 dB |
| Overvoltage Protection | 130 Vrms at 60 Hz or 250 VDC |
| Cable Length | Approx. 85 cm |
| Condition | Used, fully functional. |
Compatibility / Application
Designed for RF voltage measurements with compatible Beckman and other suitable 22 MΩ input impedance meters. Compatibility with a specific meter should be confirmed by connector type and instrument specifications before use.
Package Contents
1 × Beckman RF-221-22 RF Probe with approx. 85 cm cable and attached leads, exactly as pictured.
Shopify Tags
Beckman, Beckman Instruments, RF-221, RF-221-22, RF probe, radio frequency probe, multimeter probe, 22 megohm, RF measurement, vintage test equipment, electronic test equipment
SEO Keywords
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Meta Title
Beckman RF-221-22 RF Probe 2kHz-200MHz 22MΩ
Meta Description
Vintage Beckman RF-221-22 peak-detecting RF probe for 22 MΩ meters. Frequency range 2 kHz–200 MHz, maximum reading 25 Vrms, 85 cm cable.
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