Theory of Operation 4

Overall Functional Description

4-12. Description of the In-Guard Lines

The following list describes the 11 5725A in-guard lines:

B-RCL

High-quality analog line from the 5725A which carries critical signals to be measured by the 5700A adc during either 5725A calibration or 5725A self diagnostics. During calibration, these signals are ICAL (output of the current calibration amplifier), HVSENSE (DC output of the sense amplifier during dc gain ac characterization), AC/AC (buffered output of the 5725A thermal rms sensor that does frequency characterization).

B-OUT HI

High voltage output from the 5725A step-up transformers, to be routed to either the 5700A front or rear panel terminals.

B-SENSE HI

High voltage sense line from the 5700A output terminals. This signal is then attenuated -100:1 by the High Voltage Sense assembly.

BOOST IN

During normal 5725A ac operation, carries the 5700A DAC outputs, which in turn drives either the High Voltage Amplifier or Current Amplifier. During 5725A calibration, BOOST IN drives the High Voltage Sense assembly with up to -260V from the 5700A Power Amplifier.

B-CURRENT

Analog line that carries the current high output from the 5700A. When the user sets the current output location to "5725A" in a 5700A menu, this signal is routed to the 5725A binding posts. Under this operating condition, all 5700A/5725A current ranges are available from the same binding posts. Line B-CURRENT carries up to

2.2A in normal operation. During current calibration, this line carries 1.3A to measure the value of the 0.02Ω 5725A current shunt.

B-IRTN

Current return for B-CURRENT; carries up to 2.2A. Line B-IRTN eventually ties to the same node as SCOM on the 5700A.

B-IGRD

Current guard voltage from the 5700A; enables internal guarding within the 5725A only.

B-VGRD

5700A guard. Enables discrete guarding/shielding within the 5725A.

B-PACOM

System common from the 5700A. Once inside the 5725A, it becomes VCOM, HVCOM, DCOM, and KCOM. B-PACOM is the current return for signals from the 5700A, including source current for driving the 5725A in the ac voltage function. Current output from the 5700A, when "5725A" is selected as the current output location, returns via B-IRTN.

B-SENSE LO

High quality ground from the 5700A that is the reference point for the 5700A DAC and Oscillator assemblies.

4-9

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Fluke 5725A instruction manual Description of the In-Guard Lines, ∙ B-Rcl

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.