Maintenance

6

 

Performance Test

4-Wire Resistance Accuracy Test (2645A)

6-20.

 

Ensure that the Accuracy Tests (above) have been completed before performing this test on the 2645A.

1.Connect the Resistance Source to Channels 1 and 11 Remove the Universal Input Module from the instrument and connect a cable from the Decade Resistance Source to the Universal Input Module terminals for channel 1 (Sense) and channel 11 (Source) as shown in Figure 6-4. Reinstall the Universal Input Module. You may also use the 5700A resistance calibration output instead of the Decade Resistance Source. Tables are provided for both connections. Refer to Figure 6-5 for the 5700A 4-wire connections.

2.Configure Channel 1 for Resistance In NetDAQ Logger, configure channel 1 for Ohms-4W, 300 range. (See “Configuring Analog Channel Functions" in Chapter 3 of this manual.)

3.Open Spy Window Select the Spy command from the Utilities menu. Select analog channel 01. Click OK to open the Spy window.

4.Verify Accuracy Configure the Decade Resistance Source for the output values below and verify the Spy window measurement is between the minimum and maximum values. Change the channel 1 range as required (see Step 2).

Resistance Range

300Ω

300Ω

3kΩ

3kΩ

30κΩ

300κΩ

Decade Resistor

Short Circuit (Zero)

290Ω

Short Circuit (Zero)

2.9 kΩ

29 kΩ

290 kΩ

Minimum Reading

0Ω

289.81Ω

0Ω

2.8981 kΩ

28.981 kΩ

288.37 kΩ

Maximum Reading

0.1Ω

290.19Ω

1.0Ω

2.9019 kΩ

29.019 kΩ

291.63 kΩ

3 MΩ

2.9 MΩ

2.8600 MΩ

2.9400 MΩ

 

 

 

 

The resistance accuracy in this table makes allowance for up to 0.01% decade resistance tolerance.

6-23

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Fluke 2640A, 2645A user manual 300Ω

2645A, 2640A specifications

The Fluke 2640A and 2645A are advanced bench multimeters that represent a significant leap in measurement technology, designed primarily for electrical engineers and technicians who require precision and reliability in their readings. These multimeters are built to cater to complex applications in manufacturing, research, and development.

One of the standout features of the Fluke 2640A and 2645A is their high accuracy. With specifications that can reach up to 0.0035% DC Voltage accuracy, users can trust that their measurements will be consistent and precise. This is especially critical in fields like automated test equipment (ATE) where exact measurements can be crucial for product quality and safety.

Both models incorporate a large, easy-to-read display, making it convenient for users to view measurement results clearly from a distance. They also feature a wide measurement range, capable of handling a variety of tasks, from basic voltage and current measurements to more complex tasks such as resistance and temperature measurements with appropriate sensors.

The multimeters also stand out with their advanced data logging capabilities. The Fluke 2645A, for instance, can store up to 10,000 readings, allowing for extensive data collection and analysis without the need for constant monitoring. This is beneficial for long-term studies or processes that require continual oversight.

Connectivity is another key characteristic. Both the 2640A and 2645A support USB and RS-232 interfaces, which enable easy integration with computers and other devices for seamless data transfer. This feature is important for engineers who rely on software for data analysis and visualization.

Another notable technology included in these models is the Fluke Connect app compatibility, which allows users to remotely monitor measurements from their smartphones or tablets. This capability provides added flexibility, enabling technicians to work hands-free while still keeping an eye on process measurements.

Additionally, the Fluke 2645A comes with a graphical display option, allowing users to visualize measurement trends over time. This graphical representation can be invaluable for diagnosing issues or observing patterns in data.

In conclusion, the Fluke 2640A and 2645A multimeters offer exceptional performance with their high accuracy, extensive data logging, connectivity options, and advanced visualization capabilities. These features make them indispensable tools for professionals in a variety of fields, ensuring that they can achieve reliable results in their measurement endeavors.