2A-23

Theory of Operation (2635A) 2A

Detailed Circuit Description

	Table 2A-4. Analog Measurement Processor Pin Descriptions (2635A)

Name		Description

VDD		+5.4V supply
ACBO		AC buffer output
AIN		(not used)
AGND2		Analog ground
ACR4		AC buffer range 4 (300V)
ACR3		AC buffer range 3 (30V)
ACR2		AC buffer range 2 (3V)
ACR1		AC buffer range 1 (300 mV)
VSSA		-5.4V supply for AC ranging
REFJ		Reference junction input
DCV		A/D converter low input
LOW		Driven guard
GRD		Reference resistor sense for ohms
RRS		Tap #4 on the DCV input divider/ohms reference network
V4		Tap #3 on the DCV input divider/ohms reference network
V3
V1		Tap #1 on the DCV input divider/ohms reference network
GRD		Driven guard
V2F		Tap #2 input on the DCV input divider/ohms reference network
V2		Tap #2 on the DCV input divider/ohms reference network
GRD		Driven guard
V0		Tap #0 on the DCV input divider/ohms reference network
GRD		Driven guard
OVS		Ohms and volts sense input
GRD		Guard
AGND1		Analog ground

-(not used)

DGND	Analog ground
FC0	Function control #0
FC1	Function control #1
FC2	Function control #2
FC3	Function control #3
FC4	(not used)
FC5	(not used)
FC6	Function control #6
FC7	Function control #7
XIN	Crystal oscillator input
XOUT	Crystal oscillator output
MRST	Master reset
AS	Analog send
AR	Analog receive
SK	Serial clock
CS	Chip select
BRS	(not used)
VSS	-5.4V dc
INT	Integrator output
SUM	Integrator summing node
B.1	Buffer output, 100 mV range
B.32	Buffer output, 300 mV range
B1	Buffer output, 1000 mV range
B3.2	Buffer output, 3V range

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 2625A, 2635A service manual 2A-23

Models: 2635A 2625A

2A-23

2635A, 2625A specifications