Maintenance

6

 

Performance Test

2-Wire Resistance Accuracy Test (2640A)

6-17.

 

Complete the following procedure to test the accuracy of the resistance function for the 2640A using 2 terminals. Measurement accuracy applies to all channels, not just the channel used for the test. (The 4-wire resistance accuracy test is more rigorous and you may wish to skip this step and continue to “4-Wire Resistance Accuracy Test.”)

1.Connect the Resistance Source to Channel 1 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. 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.

2.Configure Channel 1 for Ohms In NetDAQ Logger, configure channel 1 for Ohms-2W, 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 channel 0101 (instrument 01, channel 01) from the Channel list. 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

30 kΩ

300kΩ

3MΩ

Decade Resistor

Short Circuit (Zero)

290Ω

Short Circuit (Zero)

2.9 kΩ

29 kΩ

290 kΩ

2.9 MΩ

Minimum Reading

0Ω

289.86Ω

0Ω

2.8986 kΩ

28.983 kΩ

289.61 kΩ

2.8914 MΩ

Maximum Reading

10Ω

300.14Ω

10.5Ω

2.9114 kΩ

29.027 kΩ

290.39 kΩ

2.9086 MΩ

*The resistance accuracy in this table makes allowance for up to 0.1Ω of lead wire resistance plus 0.01% decade resistance tolerance. You must add any additional lead wire resistance present in your setup to the resistance values given in this table.

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Fluke 2645A user manual Wire Resistance Accuracy Test 2640A, Resistance Range, Decade Resistor

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.