Topic: An Updated Methodology for Scale and Balance Calibrations
Speaker: Ken Kolb, Transcat, Inc.
This presentation details a revision to the methodology used by Transcat for the calibration of scales and balances. In particular, a 'substitution' method is now used to evaluate nonlinearity. This method eliminates a characteristic of the former 'direct' method that frequently resulted in very low or upside-down TURs. Other enhancements in the revised method also contribute to a better estimation of the overall balance uncertainty. The overall uncertainty (often thought of as accuracy) is useful in direct weighing applications, especially when the OEM specifications state subcomponent performance ratings (linearity, repeatability, eccentricity, etc.) but not the overall accuracy. The substitution linearity method could also be applied to other measurement systems where physical artifacts can be used. For example, a relatively short end measuring rod could be used to incrementally characterize the nonlinearity of a long length measuring apparatus and provide an uncertainty typically much smaller than achievable using assortment length end rods.
- Learn a revised methodology for the calibration of scales and balances.
- Understanding a new 'substitution' method used to evaluate nonlinearity
- Enhancements in the revised method that contribute to a better estimation of the overall balance uncertainty
Topic: The Metrology of High Frequency Signal Integrity
Speaker: Chris Grachanen, Transcat, Inc.
The fifth generation (5G) of mobile communication networks is one of the upcoming communication schemes which requires advance hardware technologies to support higher data rates, lower network latencies, better energy efficiencies and reliable connectivity. These hardware technologies are restrained by the passive interconnections between integrated circuits which are susceptible to impediments such as transmission loss, return loss due to complex impedance mismatches, signal risetime adulteration, channel to channel timing skews and cross-talk interference. The validation of interconnection performance employs a variety of time and frequency domain based test equipment and associated testing methodologies operating in the tens of gigahertz. This presentation will explore the metrology behind high frequency interconnection measurements. So, hold on to your pocket protector, it’s going to get technical.
- What is the fifth generation (5G) of mobile communication networks
- Metrology behind high frequency interconnection measurements
Topic: Innovations in Precision Voltage Dividers
Speaker: Tim Stark, Guildline Instruments Limited
Voltage dividers are commonly used with Electronic Voltage References, typically 10 V or 1 V, to calibrate voltage references, voltage meters, and voltage sources. One application is to divide down the reference voltage to create very accurate lower voltages (e.g. from 1 V to 1 mV via 1:10, 1:100 and 1:1000 ratios). Another use of voltage dividers is to allow comparison from a secondary voltage source to an Electronic Voltage Reference by reducing the secondary’s voltage level to that of the Electronic Voltage Reference. This presentation will show the progression of voltage dividers from the early 1950’s through the variations available today. Different designs will be presented for voltage dividers, along with a description of manufacturing issues and operational challenges. For example, today the lowest uncertainty voltage dividers require a lengthy calibration process before use and typically can meet their best uncertainties for only an 8-hour operational period. The calibration and operational process is either 100% manual or requires very expensive and complex standards as well as time-consuming and complicated procedures. The presentation will provide insight into newly developed and patent pending technology/designs that overcome many of the issues that have plagued the limitations of precision voltage dividers as well as solutions to operational, and automation of these standards.
- Understand the use of high precision voltage dividers
- Progression of voltage dividers from the early 1950’s through the variations available today
- How to overcome the limitations of precision voltage dividers and solutions to automate these measurements
Topic: Balancing Cost Savings and ISO/IEC 17025
Speaker: Gary Bennett, National Instruments Corporation
How does standardizing contract review help and hinder a calibration laboratory? As a Metrology Laboratory Manager, I want the variations of the laboratory processes to be at a minimum. In our laboratory we want one way to calibrate each item that we support. The efficiencies we’ve developed are lost when a customer wants something different than what we normally provide. On the other hand, when I send one our standards out for calibration, I want it calibrated exactly how I tell that provider I want it calibrated. I don’t care that it’s not the way they normally do that particular item. I’m the customer and ISO/IEC 17025 talks a lot about meeting the customers’ requirements. Everything that I send out for calibration I want done the same as last time. With every variation, something has to give, and efficiency is reduced. I am willing to pay more for the variation I demand from another calibration laboratory, but I report to people within my organization that require cost savings. Variation and cost savings are almost always mutually exclusive; unless I charge a lot more for the variation to allow for the variation to happen. During this presentation you’ll see some examples of how we have worked with our calibration providers to achieve the calibrations we needed.
- Understand contract review requirements if ISO/IEC 17025
- Understand what to ask for when requesting a calibration
- Understand you can't just say "I want this calibrated." anymore. Every calibration laboratory can perform a calibration differently. Even the same laboratory can provide a different calibration on the same item.
Speaker: David A. Patterson, Fluke Calibration