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Managing Your Network Using Fluke DAQ

Using Equations with Computed Channels

Each computed channel can have an expression of 250 characters but the maximum number of characters available in all 60 channels is limited to 6,000 characters.

For example, you could use an equation to calculate the rate of flow in gallons per second. The rate of flow could be calculated as follows. Since TS is in milliseconds, you need to divide by 1000 to calculate gallons per second. In this example, during the first pass, C902 will not be defined and the result will be not a number (#Inf). However, in subsequent passes, C902 will be defined and will provide the correct result.

C101 = some fake measurement to force the time calculation

C901 = (TOT-C902)/(TS/1000)

C902 = TOT

Note

You need one physical channel configured in the module that you’re scanning for this to work even though you’re not using the channel in the expression.

Computed channels and the time value are initialized to zero at the beginning of scanning. Physical channels that haven’t been measured are still initialized to positive infinity.

To measure the total energy used by a simple system, a calculation could be generated using the equation, energy = R x I^2 * time, as follows:

c101 = Ohms

c102 = Current

c959 = c959+c960

c960 = c101*c102**2*ts/1000

Note

This equation assumes that the resistance and current are constant for the duration of the time interval. It also does not calculate the energy used in the first increment of time.

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Fluke 2686A, 2680A manual Using Equations with Computed Channels
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2686A, 2680A specifications

The Fluke 2680A and 2686A are sophisticated data acquisition systems designed for versatile applications in electrical and environmental testing. These high-performance devices cater to engineers and technicians who require reliable and precise measurement capabilities.

At the heart of these instruments is their advanced modular design, which allows users to customize the system according to specific measurement needs. The Fluke 2680A offers eight channels, while the 2686A boasts an impressive 20 channels of data acquisition, thus providing flexibility for various testing scenarios. This modularity ensures that users can easily expand their measurement capabilities by adding more channels or switching between different measurement modules.

One of the standout features of the Fluke 2680A and 2686A is their ability to perform simultaneous measurements across multiple channels. This is particularly beneficial for applications that require real-time data analysis, minimizing the time spent on sequential measurements. With sample rates reaching up to 100 kS/s, these devices provide quick and accurate data collection, making them ideal for both laboratory settings and field use.

Both models incorporate advanced signal conditioning technology, enabling them to handle a wide range of input types, including voltage, current, temperature, and resistance. This capability eliminates the need for external signal conditioning equipment, streamlining the setup and reducing overall costs for users. The inclusion of built-in digital filtering and scaling further enhances measurement accuracy, ensuring reliable results even in noisy environments.

The Fluke 2680A and 2686A also feature robust connectivity options, including USB, Ethernet, and RS-232 interfaces. This promotes seamless integration into existing networks and facilitates remote monitoring and control. Additionally, both devices support various programming languages, allowing for easy automation of testing procedures.

Another highlight is the intuitive user interface that allows users to configure the device with minimal effort. An embedded web server provides remote access to the instrument, enabling users to monitor data and configure settings from anywhere.

In summary, the Fluke 2680A and 2686A stand out as premier data acquisition systems, offering exceptional modularity, versatile measurement capabilities, and advanced connectivity options. Their combination of speed, accuracy, and ease of use makes them indispensable tools for professionals in testing and measurement applications.
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