Agilent / HP / Keysight 6627A

The Agilent / HP 6627A Multiple Output Linear Power Supply features a combination of programming capabilities and linear power supply performance that make systems applications. The model in its family offers a total of up to 200 watts of output power, with voltages up to 50 volts and currents up to 10 amps.

Each isolated output can supply power in two ranges. This flexibility allows using the same output to power loads with different voltage and current requirements.

In the 6627A, no separate command is required to program ranges; the power supply automatically selects one of the operating ranges based on the last parameter (voltage or current) that is set.

Additionally, each output contains an active down-programmer, which means that voltage down-programming can be accomplished as quickly as up-programming, even without a load.

The output voltage and current for any output can be monitored with the front panel display. Output specific error messages are also displayed. Front panel annunciators show the operating status of the instrument.

The front panel keypad lets the user set and read back the voltage limit, current limit, and over voltage trip level of any output. With the keypad of the 6627A, outputs can be enabled or disabled mask and delay bits in the fault register, enable over current protection, reset over voltage and over current protection, and return to local operating mode.

The multiple output power supply can be both a listener and a talker on the GP-IB. (GP-IB is Hewlett Packard's implementation of IEEE-488). The built-in interface is tailored to the supply, resulting in simpler programming. Voltage and current settings can be sent directly to the specified dual range output in volts and amps.

The supply responds to a serial poll by identifying the output on which the fault occurred. Self-contained measurement and read-back capability eliminate the need for externally scanning the outputs using a separate DVM. Upon command the supply will measure its output voltage or current and return the value on the GP-IB.

Voltage and current programming, Voltage and current measurement and read back, present and accumulated status read back, programmable service request mask, programmable over voltage and over current protection, storage and recall of programmed voltage and current values for all outputs, Queries of programmed functions or settings, Output enable or disable, Programming syntax error detection, Programmable delay time for service request and OCP mask, Voltage, current, and over-voltage calibration, GP-IB interface selftest, Message display capability on the front panel are the functions implemented via GP-IB.

Output connections are made to rear panel screw terminals. Either the positive or negative output terminal can be grounded, or the output can be floated up to 240 Vdc (including output voltage) from the chassis's ground. Output voltage can be locally or remotely sensed, and identical outputs can be operated in series or parallel combinations for increased output voltage or current capability. As shipped from the factory, the power supply is jumpered for local sensing.

Power supply can be calibrated without having to remove the cover or even having to remove it from your system cabinet. This feature allows calibrating the supply at its normal operating temperature. The recommended calibration interval is one year. A calibration security jumper is available inside the unit.

The GP-IB board provides the interface between the user and the multiple outputs of the power supply. Each output board is actually an output channel that can be individually selected and controlled over the GP-IB or from the supply’s front panel. Circuits on the GP-IB board interpret commands from the GP-IB or from the front panel to control the selected output.

The GP-IB board also processes measurement and status data received from the output boards. This data may be read back over the GP-IB and/or displayed on the supply’s front panel.