Hydra

Service Manual

	2-32.	Digital Kernel	2-10
	2-43.	Digital I/O	2-14
	2-44.	Digital Input Threshold	2-15
	2-45.	Digital Input Buffers	2-15
	2-46.	Digital and Alarm Output Drivers	2-15
	2-47.	Totalizer Input	2-16
	2-48.	External Trigger Input Circuits	2-16
	2-49.	A/D Converter PCA	2-16
	2-50.	Analog Measurement Processor	2-17
	2-51.	Input Protection	2-17
	2-52.	Input Signal Conditioning	2-20
	2-58.	Passive and Active Filters	2-25
	2-59.	A/D Converter	2-26
	2-60.	Inguard Microcontroller Circuitry	2-27
	2-61.	Channel Selection Circuitry	2-27
	2-62.	Open Thermocouple Check	2-28
	2-63.	Input Connector PCA	2-28
	2-64.	Display PCA	2-29
	2-65.	Main PCA Connector	2-29
	2-66.	Front Panel Switches	2-29
	2-67.	Display	2-30
	2-68.	Beeper Drive Circuit	2-30
	2-69.	Watchdog Timer and Reset Circuit	2-30
	2-70.	Display Controller	2-31
	2-71.	Memory PCA (2625A Only)	2-33
	2-72.	Main PCA Connector	2-33
	2-73.	Address Decoding	2-33
	2-74.	Page Register	2-34
	2-75.	Byte Counter	2-34
	2-76.	Nonvolatile Memory	2-34
	2-77.	IEEE-488 Interface (Option -05)	2-34
2A	Theory of Operation (2635A)		2A-1
	2A-1.	Introduction	2A-3
	2A-2.	Functional Block Description	2A-3
	2A-3.	Main PCA Circuitry	2A-3
	2A-4.	Power Supply	2A-3
	2A-5.	Digital Kernel	2A-3
	2A-6.	Serial Communication (Guard Crossing)	2A-6
	2A-7.	Digital Inputs and Outputs	2A-6
	2A-8.	A/D Converter PCA	2A-6
	2A-9.	Analog Measurement Processor	2A-6
	2A-10.	Input Protection Circuitry	2A-6
	2A-11.	Input Signal Conditioning	2A-6
	2A-12.	Analog-to-Digital (A/D) Converter	2A-6
	2A-13.	Inguard Microcontroller Circuitry	2A-6
	2A-14.	Channel Selection Circuitry	2A-7
	2A-15.	Open Thermocouple Check Circuitry	2A-7
	2A-16.	Input Connector Assembly	2A-7
	2A-17.	20 Channel Terminals	2A-7
	2A-18.	Reference Junction Temperature	2A-7
	2A-19.	Display PCA	2A-7
	2A-20. Memory Card Interface PCA		2A-7
	2A-21. Detailed Circuit Description		2A-7

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.

Fluke 2635A, 2625A service manual Hydra

Models: 2635A 2625A

HYDRA

Watchdog Timer and Reset Circuit

Theory of Operation (2635A)

2A-1

2635A, 2625A specifications