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

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Getting Started

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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Contents 2680A/2686A Limited Warranty and Limitation of Liability Interference Information Safety InformationSafety Terms in this Manual Xwwarning Xwwarning Do not Operate in Explosive Atmospheres General Specifications Characteristic Additional Safety InformationSpecification Page Table of Contents 2680A/2686A Introduction Getting StartedAdditional Information Contacting FlukeReviewing and Setting the Base Channel Number Configuring the 268XAReviewing and Setting the Base Channel Number Examples for Reviewing and Setting the BCN Reviewing and Setting the Line Frequency Reviewing and Setting the Line FrequencyExamples for Reviewing and Setting the Line Frequency Reviewing and Setting the Network Type Reviewing and Setting the Network TypeExamples for Reviewing and Setting the Network Type Reviewing and Setting the Network Type to General Communications display for reviewing the network type IP address display for setting an IP0 digit for example Reviewing and Setting the General Network Socket Port Reviewing and Setting the General Network Socket PortReviewing and Setting the General Network IP Address Reviewing and Setting the General Network IP AddressReviewing and Setting the Subnet Mask and Default Gateway Appears in the secondary display Reviewing and Setting the Subnet Mask and Default GatewayViewing the Device Ethernet Address Viewing the Device Ethernet AddressExamples for Viewing the Ethernet Address Host Computer and Network Preparation Installing Host Computer Ethernet AdapterPreparing for Network Operation SoftwareHost Computer/Device Direct Connection Device and Host Computer InterconnectionInterconnection Using 10/100BaseT Twisted Pair Wiring Installing Host Computer Networking Software Setting Host Computer Networking Parameters To install Fluke DAQ software on your computer Installing Fluke DAQ SoftwareInstalling Fluke DAQ Software Fluke DAQ Toolbar Buttons Function Using the ToolbarUnderstanding the User Interface Understanding the User Interface Understanding the Workspace Area Computed Channel Status Icon Checking Operational StatusDevice Status Icon Module Status IconDevice Configuration Dialog Configuration DialogsNetwork Configuration Dialog Computed Channel Configuration Dialog Module Configuration DialogAnalog Channel Configuration Dialog DIO Configuration DialogSecurity Dialogs Communication DialogsTrend Dialog Alarm DialogMail and Web Settings Dialogs To insert and configure a device Managing Your Network Using Fluke DAQInserting and Configuring a 268XA Device Network Type Configuration fileGroup is externally wired Advanced Setting autodisable scan Interval 3 autoscan rateTreeView panel, select the device you just added Verify Button Configuration transferTemperature Units IP AddressLog to PC Card 2686A only Monitor ChannelScan Parameters Scan OverflowModule Type Inserting and Configuring a ModuleTo insert and configure a module Module NumberAlg109s.bmp Drift Correction Alarm TriggerInterval Trigger External TriggerDirection Start CountDebounce To insert and configure a Channel Inserting and Configuring a ChannelUnit Label Alarm TypeCH # LabelConfiguring a Computed Channel Alg117s.bmp Computed channels are assigned channel numbers from 901 to Channel a or Channel B Use Channel as Alarm TriggerDigital Output Trigger Scan With ModuleUsing Equations with Computed Channels Alg120s.bmp Starting a Scan Starting a Configuration ScanTo start a configuration scan To start a device scan Starting a Device ScanTo start a Spy scan Starting a Scan Using SpyTo view module measurement data Viewing Module Measurement DataTo view digital I/O points dialog Using the Digital I/O Points Communication DialogTo use the trend feature Using Trend to View Collected DataExport PenType ZoomDuration Device IDModule Start Date/Start TimeTo change the strip chart display Changing the Chart DisplayTo view alarms Viewing AlarmsPeriod of Viewing Alarm Device FiltersAck To use the system security feature Using Fluke DAQ System Security FeaturesTo enter web and alarm mail settings Configuring Web and Alarm Mail SettingsUniform Resource Locator URL Send alarms by e-mailUpdate Data Server IP Address

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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