Agilent/Keysight 1143A

The Keysight 1143A is a probe offset control and power module that supplies independent power and programmable offset voltage to dual active probes in measurement systems where direct oscilloscope front-panel powering is unavailable. It delivers stable ±17.3 Vdc output with 300 mA per rail and enables two independently operated probes with offset adjustment from ±50 V at variable current up to ±5 mA per channel. Rear-panel 9-pin D-subminiature connectors and remote control input support flexible system integration.

Designed for the Keysight 54700-series and 54701A active probes, the 1143A operates reliably across 0°C to +55°C and altitude to 4,600 meters.

Technical Specifications

• Positive Power Output: +17.3 Vdc ±150 mV


• Negative Power Output: -17.3 Vdc ±150 mV


• Maximum Current per Supply: 300 mA


• Programmable Offset Range: ±50 V


• Offset Current Control: 0 to ±5 mA variable


• Independent Channels: 2 probes


• Offset Control Interface: 9-pin D-subminiature rear connector


• Input Voltage: 90–132 Vac / 198–264 Vac


• Input Frequency: 47 to 440 Hz


• Power Consumption: 40 VA maximum


• Operating Temperature: 0°C to +55°C


• Operating Humidity: Up to 95% RH (non-condensing) at +40°C


• Operating Altitude: Up to 4,600 meters (15,000 ft)


• Vibration Tolerance: 0.3 grms (5–500 Hz random, 10 min per axis)


• Dimensions: 211 mm × 173 mm × 78 mm


• Net Weight: 1.5 kg

Key Features

• Dual-channel independent offset control


• Remote offset control input for automated test systems


• Compact form factor with universal AC input range


• Stable supply voltage tolerances ensure probe accuracy

Compatibility & Integration The 1143A pairs with Keysight 54700-series and 54701A active probes, making it suitable for 50-ohm measurement systems where dedicated probe power is required. A 1.5-meter probe power extension cable (Option 001) is available for systems requiring offset connections beyond the module's rear panel. Note: This product is obsolete and no longer manufactured due to non-compliance with EU RoHS Directive 2011/65/EU.