Front Panel Operation - 5

2 - Querying and Clearing Output Protection

The dc source will disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output.

Query and clear the dc source overcurrent protection feature as follows:

Action

1.On the Function keypad, press Protect. In this example, OC indicates that an overcurrent condition has occurred. Other protection indicators are: OT (overtemperature), OV (overvoltage), RI (remote inhibit), and FS (internal fuse is open).

2.On the Function keypad, press Current. This displays the present output current limit. (10% of the maximum rating is the default current limit setting).

3.To restore normal operation after the cause of the overcurrent condition has been removed, press Shift, Prot Clr. The OCP annunciator then will go off.

3 - Making Front Panel Measurements

Display

OC -- -- -- --

CURR 0.2045 (2 amp unit)

When the dc source is operating in front panel meter mode, all front panel measurements are calculated from a total of 2048 readings taken at a 46.8 microsecond sampling rate. The unit alternates between voltage and current measurements. Therefore, the data acquisition time for a single front panel voltage or current measurement is about 100 milliseconds. The sample rate and number of data points are fixed, and there are no trigger controls for front panel measurements. This fixed sampling rate and data acquisition time combined with a built-in windowing function, reduces errors due to sampling a non-integral number of cycles of a waveform for frequencies of 25 Hz or greater. Note that the windowing function is less accurate when measuring output waveforms for frequencies less than 25 Hz, causing the front panel meter to jitter.

When controlling the unit over the HP-IB interface, you can vary both the sampling rate and the number of data points in each measurement. If you are using the HP 66332A dc source to measure waveform data, the HP-IB interface also lets you qualify the triggers that initiate the measurements. With this flexibility, measurement accuracy can be improved for waveforms with frequencies as low as several Hertz. Refer to chapter 3 in the Programming Guide for more information.

Two current measurement ranges can be selected in the Input menu. A high current range is available for measuring output currents up to the 30% higher than the maximum rating of the dc source. A low current range is available for improved resolution when measuring output currents below 20 milliamperes. The low current measurement range is accurate to 0.1% of the reading

±2.5 microamperes. When the current Range is set to AUTO, the unit automatically selects the range that provides the best measurement resolution.

NOTE: If the front panel display indicates OVLD, the output has exceeded the measurement capability of the instrument. If the front panel display indicates

-- -- -- -- -- -- , an HP-IB measurement is in progress.

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HP 6634B, 6633B, 6632B, 6631B manual Querying and Clearing Output Protection, Making Front Panel Measurements, Action
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6631B, 6633B, 6634B, 6632B specifications

The HP 6632B, 6634B, 6612B, and 6633B are high-performance programmable power supplies that have gained prominence in various testing and measurement applications. These models are part of the HP 6000 series, which is renowned for its reliability and versatility in providing precision power supply solutions.

The HP 6632B offers a dual-output capability, delivering up to 32 volts and 3 amps per channel. It is designed for applications requiring stable and accurate voltage and current supplies. With features like overvoltage protection and short-circuit protection, it ensures the safety of both the device under test and the power supply itself. The programmable voltage and current settings allow operators to automate their testing procedures, increasing efficiency.

The HP 6634B takes performance a step further with multiple outputs, providing up to 32 volts and 5 amps per channel. This model is particularly suited for applications requiring higher current, especially in battery testing and device characterization. The ability to program the device remotely adds an extra layer of usability, making it ideal for integration into automated testing environments.

The HP 6612B model is tailored for users who require a compact and portable power supply solution. It delivers up to 20 volts and 2 amps. Despite its smaller size, it retains essential features like programmable settings and fast transient response, making it suitable for both educational purposes and field testing scenarios.

For users looking for a versatile, multi-channel solution, the HP 6633B presents itself as an excellent choice. This model offers up to 32 volts and 5 amps across multiple outputs. It supports a wide range of programmable features and has an intuitive interface, making it user-friendly for both beginners and experienced engineers. The robust design of the 6633B ensures reliable performance in demanding environments.

All four models utilize advanced linear power supply technology that minimizes ripple and noise, which is critical for sensitive electronic components. Together, these power supplies provide professionals in research, manufacturing, and testing with the precision they need for their experiments and product developments. The combination of programmability, safety features, and high-performance specifications makes the HP 6632B, 6634B, 6612B, and 6633B essential tools for electronic engineers and technicians.
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