5725A

Instruction Manual

Inside the 5725A, B-SENSE LO is buffered by the 5725A, with the equivalent voltage called MCOM.

B-FEEDBACK

During ac voltage operation, B-FEEDBACK is the output of the High Voltage Sense assembly; this signal represents B-SENSE HI divided by -100, and drives the 5700A ac/dc thermal sensor. During low-frequency ac voltage calibration, this is the sense path for the -260V dc from the 5700A Power Amplifier.

During ac current operation, B-FEEDBACK is the output of the current calibration amplifier. It represents the output current divided by -5 and drives the 5700A Oscillator feedback.

During dc current operation, voltage from the 5700A 2V dc range is fed to the 5725A on B-FEEDBACK.

If B-FEEDBACK is out of tolerance during 5725A ac voltage or current operation but no other faults are reported, the 5700A sends a message to the 5725A asking for a sequenced shutdown into standby, and displays a fault message on its Control Display. The 5725A FAULT indicator lights. A faulty 5700A/5725A interface connection could cause this problem.

4-13. Functional Summaries by Assembly

For an overview of all the assemblies in the 5725A and the functions contained on each, refer to Figure 4-1, the overall block diagram, and the following list:

Interconnect Assembly (A1):

Connectors and traces to link other assemblies and fan

High voltage transformer secondary switching circuitry

Power Supply Assembly (A4):

Rectifiers for high voltage supplies

Filters for high voltage supplies

High voltage current-limit circuitry

High voltage supply-monitoring circuitry

Rectifiers for system supplies

Filters for system supplies

Regulators for system supplies

Rectifiers for fan supply

Filter for fan supply

Digital Assembly (A5)

LED front panel status annunciators

CPU, RAM, ROM, EEROM, watchdog timer, logic

Current Amplifier Assembly (A2):

Transconductance amplifier

Current shunt

Heat sink and current power devices

5700A current routing circuits

Filters for high current supply

Rectifier bridge for high current supply

Regulators for low current supply

Current heat sink temperature monitor

4-10

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Fluke 5725A instruction manual Functional Summaries by Assembly, ∙ B-Feedback

5725A specifications

The Fluke 5725A is a high-performance, multifunctional temperature calibration source designed to meet the demanding requirements of laboratory and industrial environments. Renowned for its accuracy, reliability, and versatility, the 5725A serves as a powerful tool for engineers and technicians engaged in temperature calibration processes.

At the core of the 5725A is its advanced measurement technology, which allows for precision temperature calibrations across a wide range. With an operating temperature range from -200°C to 660°C, it caters to various applications, making it suitable for calibrating thermocouples, resistance temperature detectors (RTDs), and other temperature measurement devices.

One of the standout features of the Fluke 5725A is its outstanding accuracy, boasting a specified uncertainty of just ±0.15°C. This level of precision ensures that users can maintain compliance with regulatory standards and regulatory requirements in fields such as aerospace, pharmaceuticals, and manufacturing.

The Fluke 5725A is equipped with dual-channel capabilities, allowing users to calibrate two devices simultaneously. This enhances productivity by minimizing downtime and optimizing workflow efficiency. The intuitive touchscreen interface simplifies operations, enabling users to view measurements, set up test parameters, and access historical data with ease.

Versatile connectivity options such as USB and Ethernet enable seamless integration into existing systems and allow for data transfer, remote control, and configuration. This feature empowers technicians to conduct calibrations efficiently, whether on-site or remotely.

The robust design of the Fluke 5725A ensures its durability in demanding environments. Built with high-quality materials, it is resistant to shocks and vibrations, making it suitable for use in manufacturing plants and laboratories where equipment may be subjected to harsh conditions.

Another notable characteristic of the 5725A is its ability to generate stable temperature outputs with minimal drift, contributing to consistency in calibration results. Its built-in self-test functionality helps ensure that the unit remains in peak operating condition, giving users confidence in their calibration processes.

In summary, the Fluke 5725A is a top-tier temperature calibration source that excels in accuracy, reliability, and user-friendliness. Whether in laboratory settings or industrial applications, its advanced technologies and features make it an essential tool for professionals tasked with maintaining precision in temperature measurements.