Agilent/Keysight U1781A

The Agilent/Keysight U1781A is an AC current clamp accessory designed to extend the measurement capabilities of compatible handheld multimeters and LCR meters. It enables non-invasive AC current measurement by clamping around a single conductor, eliminating the need for direct circuit interruption. The clamp outputs through a BNC connector integrated with a banana plug adapter for direct connection to instruments with standard banana jack inputs.

Technical Specifications

• Measurement Type: AC Current


• Maximum Current Range: Up to 400 A


• Frequency Response: 50 Hz to 400 Hz


• Jaw Opening: 30 mm


• Output Connector: BNC with banana plug adapter


• Included Accessories: Alligator clip leads and BNC to banana plug adapter

Key Features

• Single-conductor clamp design for safe, non-contact AC current measurement


• 30 mm jaw opening accommodates standard electrical conductors


• Integrated BNC output with adapter for seamless multimeter integration


• Operates across industrial power frequencies and harmonic ranges

Typical Applications

• AC current measurement in live circuits without breaking connections


• Industrial power monitoring and troubleshooting


• Field measurements where conventional test leads are impractical


• Harmonic and load current analysis in power distribution systems

Compatibility & Integration The U1781A pairs with Agilent U1700 series handheld LCR meters and other Agilent handheld digital multimeters equipped with banana jack inputs. The supplied BNC to banana plug adapter enables direct connection without additional hardware. Measurement accuracy and resolution depend on the host multimeter's specifications.