Siglent CP4070 150 KHz 200 Amp Current Probe
Siglent CP4070 150 KHz 200 Amp Current Probe.
200 A AC/DC current probe, DC–300 kHz
The CP4070 carries 200 A peak and 70 Arms continuously with DC to 300 kHz of bandwidth — more than three times the current of the CP4020 for the same ±2% accuracy. This is the probe for three-phase equipment, large drives and inrush events that would clip a smaller clamp.
The output is a voltage on a plain BNC at a stated millivolts per amp, so it works with any oscilloscope of any brand — and with a multimeter through a BNC-to-banana adapter. A slide switch picks the range, a knob nulls the residual magnetism in the core before you measure, and the supplied 9 V adapter powers it. Nothing to configure, nothing proprietary.
What it does well
The things that decide whether a current measurement can be trusted.
True AC and DC
A Hall-effect core reads direct current as well as alternating, so a DC bus, a battery discharge or the standing current in a supply rail shows up as a real level — not a signal an AC-only clamp would miss entirely.
Works with any oscilloscope
Plain BNC output at 50 mV/A or 5 mV/A. Set the channel to match and read amps straight off the screen. No proprietary bus, no scope-brand lock-in.
200 A without losing accuracy
±2% right across both ranges, from 0.4 A to 200 A peak. Many high-current clamps give up accuracy at the top of their range; this one does not.
Zero before you measure
Clamping around iron leaves a remanent field that offsets every later DC reading. The zero adjustment nulls it in a second — the step that decides whether a DC current measurement can be trusted.
Rated for mains work
600 V CAT III · 600 V CAT II, with jaws that close over conductors up to 10.3 mm.
Key specifications
- DC–300 kHz (−3 dB), rise time 1.2 µs
- 70 Arms continuous · 200 A peak
- Ranges 50 mV/A and 5 mV/A
- Jaws accept conductors up to 10.3 mm
- Powered by the supplied 9 V adapter
- Plain BNC output — any oscilloscope, any brand
- Also reads on a multimeter with a BNC-banana adapter
- 600 V CAT III · 600 V CAT II
Application examples
Three-phase and industrial drives
70 Arms continuous covers most industrial single-phase and many three-phase legs without a CT.
Large inrush and fault current
200 A of headroom means the first cycle of a transformer or motor start is captured whole, not clipped.
Welding, heating and traction equipment
High steady currents where the waveform still matters — power factor, harmonics and switching artefacts.
Battery and DC distribution
True DC response reads charge and discharge current on 48 V systems and large battery banks directly.
Specifications
| Bandwidth | DC–300 kHz (−3 dB) |
|---|---|
| Rise time | 1.2 µs |
| Maximum continuous current | 70 Arms |
| Peak current | 200 A |
| Range switch | 50 mV/A and 5 mV/A |
| DC accuracy | ±2% ±0.4 A at 50 mV/A (0.4–10 A p-p) ±2% ±1 A at 5 mV/A (1–200 A p-p) |
| Power supply | DC 9 V adapter (supplied) |
| Maximum rated voltage to earth | 600 V CAT III · 600 V CAT II |
| Maximum conductor size | 10.3 mm |
| Output | BNC |
| Cable length | 100 cm |
| Weight | 310 g |
Taken from the SIGLENT Probe Data Sheet. Errors and omissions excepted; specifications may change without notice.
In the box
- Current probe
- 9 V DC adapter
- Instruction manual
Not sure this is the right probe?
Tell us the current you expect, the frequency it moves at, which oscilloscope you own and whether there is DC in the measurement. We will tell you which probe fits — including when a cheaper one covers it.