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Fluke 2645A, 2640A user manual Interconnection Using 10Base2 Coaxial Wiring

Models: 2645A 2640A

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2640A/2645A NetDAQ

Users Manual

Interconnection Using 10Base2 (Coaxial) Wiring

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PCaution

Connect the ground lug on the 50-Ohm terminator to the instrument ground terminal only when there is no other shield ground connected for the network.

10Base2 interconnection uses 50-Ohm coaxial cables (Belden 9907 or equal) that loop between equipment items and connect at each station through a BNC "T" or "Y" connector. Each network endpoint terminates into a 50-Ohm load. The minimum distance between BNC T connections is 20 inches (0.5 meter) and the total cable length (without repeaters) must not exceed 600 feet (185 meters).

Complete the following procedure to interconnect the instruments and host computer using 10Base2 coax (Figure 2-31).

1.Connect a BNC T or Y to the 10Base2 port on each instrument and on each host computer.

2.Connect approved Ethernet cables (for example, Belden 9907) with BNC connectors to each BNC T or Y. Be sure you are using 50-Ohm cable!

3.Connect 50-Ohm terminators to the BNC T and Y end points. Be sure you have installed 50-Ohm terminations even if there is a direct connection between the host computer and a single instrument. The instrument 50-Ohm terminator at the network endpoint has a ground wire that is connected to the instrument ground terminal (adjacent to the BNC connector) only when there is no other shield ground connected for the network. (See Figure 2-32.)

Interconnection Using 10BaseT (Twisted-Pair) Ethernet Wiring

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The instruments support connection via twisted-pair Ethernet, usually in conjunction with a "hub" for multiple instruments (See Figure 2-33). Take care that you use twisted pair wires designed for 10BaseT network use (phone cables will not work). Refer interconnection issues to your network administrator. (See Appendix I, "Network Considerations.")

Direct connection between a single host computer and a single instrument with 10BaseT is possible, but you must use a special cable that has its transmit and receive lines crossed. (See Figure 2-32.)

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Fluke 2645A Interconnection Using 10Base2 Coaxial Wiring, Interconnection Using 10BaseT Twisted-Pair Ethernet Wiring
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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.