Description
When your current stays in the hundreds of amps, a smaller range gives a cleaner trace. The Rohde & Schwarz CMN50HF3 probe is a Rogowski current probe for up to 600 A, with a 12 Hz to 50 MHz band and a 10 mV/A output. Like any Rogowski design, it wraps a flexible coil around the conductor, so you never open the circuit. Lost in HCM rents and sells it in Vietnam.
Why 10 mV/A matters
Signal level decides how much detail you see. For instance, a 20 A ripple gives 200 mV from this coil, against 20 mV from the 6 kA version. So small features rise above the scope noise, and you can use a finer vertical scale.
| Model | Max current | Sensitivity | Band |
|---|---|---|---|
| CMN50HF3 | 600 A | 10 mV/A | 12 Hz to 50 MHz |
| CMN50HF15 | 3 kA | 2 mV/A | 3.0 Hz to 50 MHz |
| CMN50HF30 | 6 kA | 1 mV/A | 1.5 Hz to 50 MHz |
Good fits for the Rohde & Schwarz CMN50HF3 probe
- Switch-mode supplies and server power shelves.
- EV chargers and onboard charger stages.
- UPS and solar inverter output stages.
- Gate loops and snubbers where space is tight.
All of these carry fast edges at moderate current. As a result, the 50 MHz top end and the higher output both earn their place.
The 12 Hz corner
The Rohde & Schwarz CMN50HF3 probe starts higher than its siblings, at 12 Hz. That trade comes with the higher output. Mains-frequency signals still sit inside the listed band. Even so, check the Rohde & Schwarz data for low-frequency response before you rely on slow waveforms.
Sending a CMN50HF3 request
Tell Lost in HCM your scope model, RMS and peak current, conductor size and test dates. Then request a quote from Lost in HCM for rental or purchase. Meanwhile, view more oscilloscope probes or open the Rohde & Schwarz current probe family page. You can also contact SMK Vietnam.
CMN50HF3 FAQ
What if my current goes above 600 A?
Stay within the listed rating, because the Rohde & Schwarz CMN50HF3 probe tops out at 600 A. For larger currents, step up to the CMN50HF15 or CMN50HF30.
Is the cable long enough for a cabinet?
The listing gives a 2.5 m cable and a 100 mm coil, which suits most bench and cabinet work.
Can it read 50 Hz mains current?
50 Hz lies inside the listed band, which starts at 12 Hz. Still, confirm the low-frequency response in the R&S data first.
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