Maintenance 7

Performance Tests

Note

If other than a T-type thermocouple is used, be sure that the instrument is set up for the type of thermocouple used.

3.Reconnect power and switch the instrument ON.

4.Insert the thermocouple and a mercury thermometer in a room temperature bath. Allow 20 minutes for thermal stabilization.

5.Select the temperature and T-type thermocouple function for channel 1.Press M.

6.The value displayed should be the temperature of the room temperature bath as measured by the mercury thermometer (within tolerances given in Table 7-4, plus any sensor inaccuracies.).

7.The Thermocouple Temperature Accuracy Test is complete. However, if you desire to perform this test on any other Input Module channel (2 through 20), repeat steps 1 through 6, substituting the appropriate channel number.

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. Reinstall the Input Module into the instrument.

Table 7-4. Performance Tests for Thermocouple Temperature Function (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

1.Reconnect power and switch the instrument ON.

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

3.Select the temperature and T-type thermocouple function for channel 1.Press M.

4.The value displayed should approximate the ambient temperature.

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

6.Verify a reading of "otc".

7.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 the appropriate channel number.

7-11

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Fluke 2635A user manual Open Thermocouple Response Test
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2635A specifications

The Fluke 2635A is a highly advanced multichannel data acquisition system designed for engineers and technicians requiring precision and versatility in their measurement tasks. This instrument excels in monitoring and capturing data from various sources, making it a valuable tool in laboratories, production environments, and field applications.

One of the standout features of the Fluke 2635A is its ability to support up to 20 measurement channels. Users can simultaneously monitor multiple signals, which is crucial for complex testing scenarios where numerous variables need to be tracked. The device is equipped with a 6.5-digit precision measurement capability that ensures high accuracy and resolution in readings. This level of precision is particularly beneficial in applications such as environmental monitoring, research and development, and industrial process control.

The unit incorporates a variety of measurement modes, including voltage, current, temperature, and resistance, making it exceptionally versatile. The Fluke 2635A not only handles standard signals but also integrates with various transducers, providing extensive compatibility for users engaged in diverse testing applications.

To enhance data management, the Fluke 2635A offers advanced data logging capabilities. Data can be stored internally or transferred to external devices for further analysis. The internal memory can accommodate extensive datasets, which can be crucial in long-term monitoring tasks. Integration with external software enables users to analyze and visualize data effectively, allowing for informed decision-making based on comprehensive results.

The user interface is designed for ease of use, featuring a large, bright LCD display that clearly presents measurements and status information. The device is also equipped with a simple navigation system, allowing users to switch between channels and measurement types without hassle.

In terms of construction, the Fluke 2635A is built to withstand rigorous environments. It features a robust design that ensures reliability and durability, making it suitable for both laboratory settings and field operations. Furthermore, the device supports a wide temperature range, thus enabling usage in diverse conditions.

Overall, the Fluke 2635A is a powerful and flexible instrument that provides precise measurements across multiple channels, supporting a wide range of applications. Its advanced technology, combined with user-friendly features, makes it an essential tool for professionals in various fields. The combination of accuracy, flexibility, and durability solidifies its standing as a trusted choice for data acquisition and monitoring tasks.
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