2-18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service Manual

HYDRA

 

 

 

ACV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC BUFFER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K15

 

GAIN CONTROL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RMS

ACTIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ACV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONVERTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FILTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

7

6

5

2

 

 

 

 

 

61

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S42

FREQUENCY

 

 

 

 

 

 

 

 

 

 

 

R32

 

 

 

S16

 

 

 

 

 

 

 

 

 

 

 

Figure

REFERENCE

 

 

 

10

 

 

 

 

 

COUNTER

 

 

S81

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JUNCTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ω LO

 

 

 

 

 

 

 

 

 

S19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ACTIVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R35

 

11

LOW

 

 

 

 

 

 

 

 

 

FILTER

 

 

 

 

 

 

 

 

 

 

 

 

S18

A/D LO

 

 

AMP

 

 

 

2-

 

 

 

V LO/RRS LO

 

 

 

 

 

 

 

 

 

 

+

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

3.

 

 

 

R34

 

DIVIDER

 

 

 

 

 

 

 

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

59

 

 

Analog

 

 

 

1K

 

 

SWITCHING

 

 

 

RRS

 

 

 

 

 

 

 

 

 

300Ω

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HI

R10

Ω

10K

300V

15

 

 

 

 

 

 

 

 

 

 

 

 

58

 

 

K16

 

 

 

 

 

 

 

 

 

 

 

 

 

PASSIVE

 

Simplified

SOURCE

 

 

3 KΩ

 

 

 

 

 

 

 

 

DC HI

 

 

 

 

57

 

 

 

1M

 

 

 

 

 

 

 

 

 

 

 

 

DC

 

 

 

 

300 KΩ

16

 

 

 

 

 

 

 

 

 

 

 

 

56

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FILTERS

 

 

 

 

100K

3 MΩ, 10 MΩ

 

 

 

 

 

 

 

 

 

 

A/D HI

 

 

 

HI

R11

 

30V

19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30 KΩ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SENSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Schematic

LO

 

 

 

 

 

TO OHMS

 

 

 

 

 

 

 

 

 

 

VDD

 

SENSE

 

 

 

 

 

SOURCE &

 

 

 

 

 

 

 

 

 

 

 

 

 

10M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LO

 

 

30 VDC

21

RRS HI

 

 

 

 

 

 

 

 

 

 

Z2

 

SOURCE

 

 

 

300 VDC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 VDC/300 MVDC/TC/Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

51

 

 

 

 

 

 

 

S3

 

 

 

 

RRS HI

 

 

 

 

VR1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Z4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R42

23

 

 

 

 

 

 

 

 

A/D

 

 

1.05V

 

 

Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C12

 

 

R43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RRS LOW

 

 

 

 

 

 

 

 

 

 

 

S2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K17

 

 

 

TO

 

 

 

 

 

 

52

A/D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REFERENCE

U8 ANALOG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

REF

 

 

 

 

 

 

 

 

 

RESISTOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPEN

 

 

 

 

OHMS

 

 

MEASUREMENT

 

DIGITAL

 

 

 

 

 

 

 

 

25

 

 

 

 

 

SECTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMOCOUPLE

 

VOLTAGE

 

 

PROCESSOR*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DETECT

 

 

 

SOURCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28

29

30

31

32

33

36

37

39

40

41

42

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.84 MHz

 

 

 

 

 

 

 

 

 

 

 

TO U9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TO U9

 

 

 

 

 

TO U9

 

 

 

 

 

s3f.

 

RRS = REFERENCE RESISTOR SENSE

 

* NOT ALL U8 SWITCHES ARE SHOWN HERE.

 

 

 

 

 

 

 

 

eps

 

 

 

 

 

REFER TO THE SCHEMATIC DIAGRAM IN SECTION 8.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 65 Page 67
Page 66
Image 66
Fluke 2635A, 2625A service manual Analog, Simplified
Page 65 Page 67

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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