Maintenance 6

Calibration

4.Verify Trigger Output is Enabled In NetDAQ Logger, select Setup Instrument Config. In the Instrument Configuration dialog box, verify the Trigger Out box is checked. Click OK to return to the Main Window. (See “The Instrument Configuration Dialog Box" in Chapter 3 of this manual.)

5.Connect Trigger Output Connect the TO test lead on the ALARM/TRIGGER IO connector to the Σ (Totalizer) test lead on the DIGITAL I/O connector. This allows each Trigger Output pulse to be counted by the Totalizer.

6.Start Instrument Scanning Click the Start Instrument button on the Button Bar to enable instrument scanning.

7.Open Spy Window Select the Spy command from the Utilities menu. Select 01TOTAL. Click OK to open the Spy window.

8.Verify Totalizer Count The Spy window displays the Totalizer count. Note the Totalizer is incrementing at 1-second intervals as it counts the Trigger Output pulse at the start of each scan.

9.Close Spy Window.

10.Stop Scanning Click the Stop Instrument button on the Button Bar to stop instrument scanning.

Calibration

6-33.

Note

Refer to the Service Manual (PN 942615) for calibration procedures. The instrument must be stabilized in an environment with an ambient temperature of 22°C to 24°C and a relative humidity of less than 70%, and must have been powered at least 30 minutes prior to calibration.

The instrument features closed-case calibration, that is, calibration that is completed over the RS-232 interface. Using known reference sources, closed-case calibration has many advantages. There are no parts to disassemble, no mechanical adjustments to make, and the instrument can be calibrated by an automated instrumentation system.

The instrument should normally be calibrated on a regular cycle, typically every 90 days to 1 year. The chosen calibration cycle depends on the accuracy specification you wish to maintain. The instrument should also be calibrated if it fails the performance test or has undergone repair.

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Fluke 2640A, 2645A user manual Calibration

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.

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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.

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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.