The Agilent 6651A is a 500-watt single-output, linear-regulated DC power supply in the 6650A series, providing 0 to 8 V at 0 to 50 A with GPIB control. The series spans five models — 6651A, 6652A, 6653A, 6654A, and 6655A — covering output voltage ranges from 0–8 V up to 0–120 V and current ranges from 50 A down to 4 A, all within a common 500 W envelope and chassis.

These supplies are designed to maximize throughput of devices under test through the manufacturing test process. Fast up and down programming time, combined with fast crowbar overvoltage protection, mode crossover protection, and the ability to connect the protection circuitry of multiple supplies together, help protect valuable assemblies from current surges caused by component failures in the DUT and can increase production yield. Lab bench use is supported through fan speed control that helps minimize acoustic noise.

Brand Heritage

The 6650A series was originally introduced under Hewlett-Packard's test and measurement business. In 1999, HP spun off that business as Agilent Technologies, and in 2014 Agilent's electronic measurement division became Keysight Technologies. Instruments from this series may be encountered with HP, Agilent, or Keysight markings depending on their production date, and all three brand names refer to the same product lineage.

Compare Other Models in This Series

The Agilent 6650A series is a family of five 500-watt single-output, linear-regulated DC power supplies sharing a common chassis, GPIB interface, and protection feature set. The models differ primarily in output voltage and current envelope: the 6651A provides 0–8 V at 0–50 A, the 6652A provides 0–20 V at 0–25 A, the 6653A provides 0–35 V at 0–15 A, the 6654A provides 0–60 V at 0–9 A, and the 6655A provides 0–120 V at 0–4 A.

All five share the same 500 W power envelope, the same fast up/down programming architecture, the same fast crowbar and mode crossover protection, the same SCPI command set, and the same ability to chain up to 16 supplies on one GPIB address via the serial link. Selecting a model is primarily a matter of matching the voltage and current envelope to the DUT, not a matter of feature tiering.

Each model linked below is its own dedicated product page with pre-owned-matched pricing and inventory. Use the comparison table to confirm voltage and current envelope against your application, then click through to the model that matches your DUT requirements.

The 6651A is the high-current, low-voltage member of the series, with 0–8 V at 0–50 A. It is typically the right choice when the DUT requires significant current at low bus voltages and where the 500 W family envelope is allocated toward amps rather than volts. Programming accuracy is 0.06% + 5 mV on voltage and 0.15% + 60 mA on current, and ripple and noise are 300 µV rms / 3 mV peak-to-peak.

Across the family, voltage and current scale in opposite directions while the 500 W envelope stays constant: the 6651A delivers the highest current (50 A) at the lowest voltage (8 V), and the 6655A delivers the highest voltage (120 V) at the lowest current (4 A). Programming accuracy, ripple, and readback accuracy specifications all scale accordingly — for example, voltage ripple ranges from 300 µV rms on the 6651A and 6652A to 700 µV rms on the 6655A, and OVP accuracy ranges from 160 mV on the 6651A to 2.4 V on the 6655A.

The comparison table that follows lists output voltage, output current at 40 °C, derated current at 50 °C and 55 °C, programming accuracy on voltage and current, ripple and noise, and load regulation side by side. Use it to confirm which model's envelope best matches your DUT's voltage and current requirements before opening the model-specific product page.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

About this used unit

• Warranty included
• Functional verification included
• Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
• Note that unnecessary accessories may not be included (contact Test Architect to confirm).

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.