The Keysight N2781B is a high-current, high-bandwidth AC/DC active current probe designed for accurate current measurements up to 150 A RMS. With a flat frequency response from DC to 10 MHz, it offers reliable current analysis on digital oscilloscopes when powered by the compatible N2779A power supply.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | BNC (output signal), proprietary power connector for N2779A |
| Compatible Oscilloscopes | Any oscilloscope with a 1 MOhm BNC input |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Requires external N2779A power supply (±12 V ±0.5 V, 5.3 VA max) |
| Operating Temperature | 0 °C to +40 °C |
| Dimensions (W×H×D) | 176 mm × 69 mm × 27 mm |
| Weight | 0.5 kg |
Electrical Performance
| Parameter | Value |
|---|---|
| Bandwidth | DC to 10 MHz (-3 dB) |
| Rise Time | ≤ 35 ns (calculated) |
| Maximum Continuous Current | 150 A AC/DC RMS |
| Maximum Peak Current | 300 A peak (non-continuous) |
| Output Voltage Rate | 0.01 V/A (10 mV/A) |
| Amplitude Accuracy | ±1.0% of reading ± 100 mA (DC, and 45 Hz to 66 Hz, 0 to 150 A) |
| Equivalent Input Noise | ≤ 25 mA RMS (on 20 MHz bandwidth limited oscilloscope) |
Physical Measurement Capabilities
| Parameter | Value |
|---|---|
| Maximum Conductor Diameter | 20 mm |
Safety & Compliance
| Parameter | Value |
|---|---|
| Maximum Rated Voltage to Earth | 300 V CAT III, 600 V CAT II (insulated conductor) |
Physical Characteristics
| Parameter | Value |
|---|---|
| Cable Length | 2 m |
Environmental
| Parameter | Value |
|---|---|
| Operating Humidity | 80% RH or less (no condensation) |
| Storage Temperature | -10 °C to +50 °C |
| Storage Humidity | 80% RH or less |
| Operating Altitude | Up to 2000 m |
Performance
| Parameter | Value |
|---|---|
| Delay Time | 230 ns (typical) |
| Insertion Impedance at 50/60 Hz | 1 mΩ or less |
| Insertion Impedance at 1 MHz | 0.1 Ω |
| Insertion Impedance at 10 MHz | 0.5 Ω |
| Effect of External Magnetic Fields | Equivalent to 150 mA or less (in a magnetic field of 400 A/m, DC or 60 Hz) |
Outputs
| Parameter | Value |
|---|---|
| Output Connector | BNC |
Power Requirements
| Parameter | Value |
|---|---|
| Power Consumption | 5.3 VA max |
| Compatible Power Supply | N2779A |
Technology
Active AC/DC Current Probe
Applications
High-current waveform analysis, power supply design, and motor drive testing