2640A/2645A NetDAQ

Users Manual

the computers and other devices attached to the network wiring. The Ethernet standard consists of a set of low-level addressing and data transmission protocols that run on several different wiring schemes.

Computers on a network are usually referred to as a “host.” The NetDAQ instruments are hosts in this context. Devices that facilitate communication between different sections of a network are called by names that indicate their function, for example, routers, bridges, repeaters, etc.

Physical Layer Wiring Schemes Supported by NetDAQ

I-5.

NetDAQ supports two of the most common wiring schemes used in Ethernet networks: 10BaseT (or UTP), and 10Base2 (thin coax).

The 10Base2 wiring method uses coaxial cable (similar to cable TV wire). This simple wiring method supports many connections to the cable, allowing multiple instruments to be directly connected to the PC. The only trick to 10Base2 wiring is that a terminator must be connected to the cable at each open end. Fluke supplies a terminator with each NetDAQ instrument and wiring kit.

The 10BaseT wiring method uses two or four pairs of twisted wires. It is also referred to as Unshielded Twisted Pair (UTP) wiring. This wiring method supports only two connections to any one run of wire. To support more than two connections, an active device called a "hub" must be used.

A hub is an active device that supports multiple 10BaseT connections. The network host attached to each connection of the hub may communicate with every other host attached to the hub. Hubs also typically allow other types of cable connections, such as 10Base2 and 10Base5 (fat coax). This is done to allow a hub to communicate with other network hosts, such as other hubs, routers, bridges, etc.

If you want to use 10BaseT wiring without a hub (to connect one NetDAQ and one PC), you must use a special 10BaseT cable. This is necessary because both hosts transmit and receive on the same pair of wires within the cable. To operate correctly in a direct wiring situation, these pairs must be crossed in the cable, so that the transmitter on one end is connected to the receiver on the other.

The 10BaseT wiring method is becoming very popular because the wire is inexpensive to purchase and install, the use of a hub allows some protection from malfunctioning network hosts, and this type of wiring is easier for network administrators to manage and control.

Network Interconnection Devices

I-6.

The following five basic devices are used in networks to extend, partition, and interconnect networks:

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Fluke 2645A, 2640A user manual Physical Layer Wiring Schemes Supported by NetDAQ, Network Interconnection Devices
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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.
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