HYDRA

Service Manual

 

S2

 

 

A3R11

 

 

 

A3K17

 

 

 

INPUT HI

 

 

 

A3R10

 

 

 

A3Z4

 

 

 

10M

 

 

 

S3

 

 

 

S9

 

 

 

 

S10

PASSIVE

 

 

 

HIGH

 

 

FILTER

 

 

 

A3Z4

 

 

A/D

10.01k

A3R34

 

 

 

 

 

 

 

 

LOW

A3K16

 

 

 

INPUT LO

 

 

 

 

 

 

s4f.eps

Figure 2-4. DC Volts 300V Range Simplified Schematic

When an input is switched in for a measurement, the ohms source in Analog Processor A3U8 is set to the correct voltage for the range selected and is connected to the appropriate reference resistor in network A3Z4. A measurement current then flows through A3Z4, relay A3K16, thermistor A3RT1, resistor A3R10, the unknown resistance, A3R43, ground, and the ohms source.

The resulting voltage across the unknown resistance is integrated for a fixed period of time by the A/D Converter through the HI SENSE path of A3R11, A3K17, A3R42 and A3U8 switch S2, and the LO SENSE path of A3R35 and Analog Processor switch S19. Passive filtering is provided by A3C34, A3C27, and portions or all of the DC Filter block.

The voltage across the reference resistor for the 300Ω and RTD, 3-kΩ, and 30-kΩranges (the 1-kΩ, 10.01-kΩ, and 100.5-kΩresistances in A3Z4, respectively) is integrated for a variable period of time until the voltage across the integrate capacitor reaches zero. For the 300Ω and RTD range, the reference resistor voltage is switched in through Analog Processor switch S6 and applied to the A/D Converter by switch S8. For the 3-kΩrange, switches S9 and S11 perform these functions, respectively. For the 30- kΩ range, switches S13 and S14 are used. For all ranges, the voltage is routed through A3R34 to the RRS input.

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Fluke 2635A, 2625A service manual Input HI
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2635A, 2625A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

Equipped with a large LCD display, the Fluke 2625A provides clear and user-friendly access to real-time measurement data. Its graphical interface allows users to visualize trends and monitor readings easily, which significantly enhances usability. The device supports a variety of input types and can connect to thermocouples, RTDs, and other sensors, offering great flexibility for various measurement tasks.

The Fluke 2625A employs advanced measurement technologies that ensure accuracy in data logging. With a high sampling rate, it captures fast-changing signals while maintaining data integrity. The device features a built-in memory that allows for extensive logging, accommodating long-term monitoring tasks without requiring constant oversight. Users can set it to log data at specified intervals, offering customizable solutions for different monitoring needs.

Another significant characteristic of the Fluke 2625A is its robust communication capabilities. The device supports USB and RS-232 interfaces for easy connectivity with computers and other devices, making data transfer and analysis seamless. This feature is especially beneficial for users who need to compile or analyze large sets of data quickly.

Furthermore, the Fluke 2625A is designed with durability in mind. Its rugged construction makes it suitable for challenging environments, including those with high levels of vibration, dust, or moisture. This reliability ensures that the device can withstand the rigors of fieldwork while still delivering accurate measurements.

In summary, the Fluke 2625A is a powerful data logger that combines versatility, accuracy, and reliability. Its user-friendly interface, advanced measurement technologies, and robust design make it an essential tool for professionals in various industries, from manufacturing and HVAC to research and development. Whether monitoring temperature changes in a laboratory or assessing voltage levels in an industrial setting, the Fluke 2625A stands out as a trusted solution for effective data logging and analysis.
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