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Top 10 News:
1. Calibrating Precision Multimeters Using a Characterized Multifunction Calibrator
Can a multifunction calibrator really verify a long scale digital multimeter that is more accurate than the calibrator? This paper describes methods to characterize a multifunction calibrator to better than manufacturer’s 24 hour specification at all points that are used to verify 8.5 digit multimeters. Using automated processes, data collection and statistical methods, it was found that a calibra
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2. Artifact calibration: theory and application
Electronic instruments generally contain both a large number and a wide variety of components. The circuit configuration and the values of the components determine the characteristics of the instrument. Unfortunately, because nothing is absolutely stable, the value of any component varies with time, and because of this, instruments require periodic calibration to assure continued compliance with s
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3. Why did my temperature sensor fail calibration
Temperature is the most commonly measured parameter in the world. Temperature sensors are used in instruments designed for measuring temperature. To be accurate, all temperature sensors must be calibrated against a known standard. Only short-term stability is checked during calibration. Long term stability should be monitored and determined by the user. Occasionally, a temperature sensor migh
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4. Calibrating the Hewlett-Packard 3458A DMM with the Fluke 5720A Multifunction Calibrator
The calibration support of your most accurate workload has always been a formidable task. As technical advances make it easier for manufacturers to offer products with state-of-the-art performance, the metrologist must find practical ways to support workload that often pushes the capabilities of the standards available. The test uncertainty ratios (TURs) between the unit under test (UUT) and the s
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5. Industrial temperature readout and probe selection guide
Industrial temperature sensors are typically calibrated by placing them in a stable temperature source (dry-well, furnace, calibration bath) and comparing their output to a reference standard probe connected to a thermometer readout. This document provides a guide for selecting a thermometer readout and companion reference standard probe thatwill provide adequate system accuracy required to calibr
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6. Verification of electrical safety testers: A better approach
Instrumentation to test the safety of electrical installations, appliances, machines and electrical/electronic devices is becoming more prevalent, driven by new regulatory standards designed to protect users from electrocution and fire hazards. Examples of mandatory, annual testing standards are the UK BS 7671/16th Edition and the German equivalent, VDE 0100. Both ensure safety compliance in comme
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7. Automated batch temperature probe calibration
Temperature probe calibration can consume a significant amount of time and require a high level of manual intervention in calibration labs. ISO 9000, global quality programs and regulatory agencies have been primary factors in the increased volume of probe calibrations requested of calibration labs today. Finding efficient methods of performing multiple probe calibrations, from temperature profili
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8. Calibrating Industrial Temperature Sensors
Industrial temperature measurement and control are two of the most dynamic subsets of the process control industry. Sensors are manufactured in every size, shape, length, and accuracy imaginable to fulfill a specific temperature application. In many cases, probes and probe assemblies are chosen not based on the application’s success, but on other factors such as price, expediency, or availability.
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