Overcurrent Protection (OCP)

The OCP is a protection feature employed by the power supply to guard against excessive output currents. When the output enters the + CC mode and the OCP is enabled, the OCP circuit down programs the output voltage and disables the output.

To enable the OCP, for output channel 1, send the command

OCP 1,1

To disable the OCP, send the command

OCP 1,0

You can find out the OCP setting by sending the following query and addressing the power supply to talk.

OCP? 1

The response from the power supply is either a "0’’ to indicate that OCP is off or a ’’1" to indicate that it is on. To reset the output channel after an overcurrent trip, you can either disable the OCP and send the reset command, or you can reduce the output current below the programmed current and then send the reset command. To reset output 1, send the command:

 

OCRST 1

 

 

Note

The supply can report a fault condition when an output is in overvoltage or overcurrent. Although the

 

OVRST and OCRST commands re-enable the output, they do not clear the fault register. As a

 

housekeeping measure, it is advisable to always clear the fault register by querying its value after an OV

 

or OC reset.

Multiple Output Storage & Recall

The power supply has 11 internal registers (0-10) each of which can store the voltage and current settings of all the outputs. By storing voltage, voltage range, current, current range and OV settings for all outputs and recalling them later, you can have significant savings in programming time. (See Supplemental Characteristics in Table 1-2). Upon shipment from the factory, registers (1-10) contain values of 0 volts and 0 current (see Table 5-4).

Registers 0-3 are non-volatile. They are limited to one STORE each. If more than one STORE is attempted, error 30 (STORE LIMIT) will result. The line must be turned off/on to re-enable these store locations. Register 0 is a special case that also contains Delay, Mask. When the power supply is turned on, it will access register 0 for power-up settings. Registers 4-10 (volatile) will be reinitialized to 0 volts and 10 mA (max OV & V, I ranges = HIGH) when power is cycled on/off.

To store voltage and current settings, issue the store (STO) command and specify a register (0-10). For example, to store the present setting of current and voltage of all outputs in register 2, send the following command:

STO 2

To set the power supply to the voltage, voltage range, current, current range, and overvoltage settings stored in a register, issue the recall (RCL) command followed by the desired register. For example to recall settings stored in register 2, send the following command:

RCL 2

When a register is recalled, the outputs will be set sequentially (output 1, output 2, etc.). If you attempt to recall a register outside the 0 to 10 range, you will get a number range error (GP-IB code 5 in Table 5-8).

Remote Operation 75

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Agilent Technologies 6629A, 6626A, 6628A, 6625A manual Overcurrent Protection OCP, Multiple Output Storage & Recall
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6629A, 6625A, 6626A, 6628A specifications

Agilent Technologies, a recognized leader in electronic test and measurement solutions, has developed a series of precision power supplies ideal for a variety of applications in both research and industry. The Agilent 6628A, 6626A, 6625A, and 6629A are part of the Agilent 6000 series and stand out due to their innovative technologies and robust functionalities.

The Agilent 6628A is a triple-output power supply, featuring two 0 to 20 V outputs capable of delivering up to 3 A each, along with a 5 V output that can supply 5 A. This combination is perfect for supplying power to devices that require multiple supply voltages simultaneously, making it an excellent choice for testing and development purposes.

The Agilent 6626A, on the other hand, offers dual output capabilities with higher specifications. Each of its outputs can be adjusted from 0 to 25 V and delivers up to 3 A, providing enhanced flexibility for designers and engineers working with various devices. Additionally, the 6626A's compact size and lightweight design make it easy to integrate into test setups without occupying excessive space.

For applications that require comprehensive monitoring, the Agilent 6625A provides a unique solution with its built-in digital voltmeter (DVM). This power supply comes with two 0 to 25 V outputs, both capable of 3 A. The integrated DVM allows real-time measurement and displays voltage and current values, ensuring accurate readings during experimentation and testing.

Lastly, the Agilent 6629A is designed for high-performance applications, providing up to four outputs, including two adjustable outputs that can be set between 0 to 35 V and deliver 5 A each. This model is particularly suited for environments where multiple devices need to be powered simultaneously with varying voltage requirements.

All four models come equipped with key features including ease of programming, precision regulation, and superior load transient response. They employ advanced technologies like low-noise operation and excellent line regulation, ensuring stable performance under varying load conditions. Additionally, safety features such as overvoltage protection, current limiting, and rapid recovery from overloads guarantee reliable operation.

In summary, Agilent's 6628A, 6626A, 6625A, and 6629A power supplies provide versatile, precise, and reliable solutions for all electronic testing needs. Their characteristics and dedicated functionalities make them indispensable tools for engineers, researchers, and developers across numerous fields. Whether it's for prototyping, testing, or production, these power supplies deliver the quality and performance that professionals expect from Agilent Technologies.
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