Maintenance 6

Performance Tests

4-WIRE (4T) CONNECTION

 

11

12

13

14

15

16

17

18

19

20

 

SOURCE

 

 

 

 

 

 

 

 

 

 

 

 

H L

 

H L

H L

H L

H L

H L

H L

H L

H L

H L

 

(4-WIRE)

 

 

 

 

 

 

 

 

 

 

 

 

SENSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H L

 

H L

H L

H L

H L

H L

H L

H L

H L

H L

 

(4-WIRE)

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

9

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DECADE

RESISTANCE

BOX

HYDRA

INPUT

MODULE

oo20f.eps

Figure 6-3. 4-Terminal Connections to Decade Resistance Box

Table 6-4. Performance Tests for Thermocouple Temperature Function (IPTS-68/ITS-90)

Thermocouple Type

J

K

N

E

T

Thermocouple Accuracy Specifications 1 Year

@ 18-28 Degrees C

±0.40°C

±0.44°C

±0.53°C

±0.38°C

±0.45°C

Open Thermocouple Response Test

1.Switch OFF power to the instrument and disconnect all high voltage inputs.

2.Remove the Input Module from the rear of the instrument. Open the Input Module and connect test leads to the H (high) and L (low) terminals of channel 1. Install the Input Module back into the instrument.

3.Reconnect power and switch the instrument ON.

4.Connect the test leads from the Input Module to an 820 ohm resistor.

5.Select the temperature and K-type thermocouple function for channel 1. Press MON.

6.The value displayed should approximate the ambient temperature.

7.Replace the 820 ohm resistor with a 4 kilohm resistor to simulate a high resistance or open thermocouple.

8.Verify a reading of "otc".

9.The Open Thermocouple Response Test is complete. However if you desire to perform this test on any other Input Module channel (2 through 20) repeat steps 1 through 8 substituting in the appropriate channel number.

6-13

Page 140 Page 142
Page 141
Image 141
Fluke 2620A, 2625A user manual Open Thermocouple Response Test, Decade Resistance BOX Hydra Input Module
Page 140 Page 142

2625A, 2620A 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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