Accuracy matters: Calibration Options for Lab Standards

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Accuracy matters: Calibration Options for Lab Standards Bob Stern Principal Metrologist, Keysight Technologies Matthew Woerner Metrologist, Keysight Technologies National Labs maintain SI Units National
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Accuracy matters: Calibration Options for Lab Standards Bob Stern Principal Metrologist, Keysight Technologies Matthew Woerner Metrologist, Keysight Technologies National Labs maintain SI Units National Institutes of Metrology (NMI)... NIST: National Institute of Science & Technology (USA) NPL: National Physics Laboratory (UK) NRC: National Research Council (Canada) METAS: Swiss Federal Institute of Metrology PTB: Physikalisch Technische Bundesanstalt (Germany) CENAM: Mexican National Laboratory INMETRO: Brazil National Laboratory... are responsible for maintaining the most accurate implementations of the key quantities needed to support international commerce. Page 2 Traceability Traceability: Property of the result of a measurement or the value of a standard whereby it can be related to the international system of units (SI units) via national metrology institutes, through an unbroken chain of comparisons all with stated uncertainties. Source: International Vocabulary of Basic and General Terms in Metrology (VIM) Page 3 4 Traceability Traceability to SI Units platinum-iridium prototype kilogram kept locked in Paris BIPM safe. US National standard platinum-iridium kilogram. Metrology laboratory uses reference masses to characterize working mass standards. Factory producing scales uses a working standard mass for scale calibration. Your bathroom scale 1. SI = Le Sisteme International d unites (Int l System of Units) The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram Page 4 Mass primary standard Photo courtesy of NRC (Ottawa) Page 5 50 lb. reference standard Page 6 Did you know? Gravity is local! Location Acceleration in Acceleration in m/s 2 ft/s 2 Amsterdam Athens Auckland Bangkok Brussels Buenos Aires Chicago Copenhagen Frankfurt Helsinki Istanbul Jakarta Kuwait Lisbon London Los Angeles Mexico City Montréal New York City Oslo Ottawa Paris Rio de Janeiro Rome San Francisco Page 7 DC/Low Frequency Hierarchy Example Page 8 Loveland, CO Standards Lab Page 9 Keysight 3458A Page 10 Page 11 Page 12 Loveland Standards Lab Page 13 Laminar airflow temperature monitors Page 14 Thermal voltage converter test station Page 15 El Segundo Center of Excellence Page 16 50 lb. reference standard from NIST Page 17 Dimensional measurements Page 18 Gage blocks need 20º ± 0.5º Celsius Page 19 Page 20 Gage block comparator Page 21 Torque - Defined Page 22 Lotsa torque wrenches Charles and his torque tester Page 23 Vacuum Measurements at El Segundo Custom vacuum chamber by Glenn Gaza Page 24 Temperature Thermodynamic temperature in Degrees Kelvin is an SI Unit Page 25 Fixed Temperature Cell Primary Standards How do you calibrate PRTs and SPRTs? COE Temp. Stds. Description ºC Boiling point, liquid Nitrogen ºC Triple point, Mercury (Hg) ºC Triple point, water (H 2 0) ºC Freeze point, Tin (Sn) ºC Freeze point, Zinc (Zn) Page 26 Triple point cell (water) Page 27 Tin Sn Zinc - Zn Page 28 Reference Thermometer (PRT) Fluke/Hart Scientific Platinum Resistance Thermometer PRT mfrgs : YSI Inc., Rosemount, & Hart Scientific (now Fluke) More good info on PRTs at: Page 29 SPRT report excerpt This Standard Platinum Resistance Thermometer (SPRT) was calibrated with a DC Bridge at constant currents of and ma. The procedure followed is based on the technical information contained in NIST Technical Note 1265, Guidelines for Realizing the International Temperature Scale of 1990 (ITS-90). In accordance with the ITS-90, the sub-ranges of to and K to , with the following fixed points and their uncertainties (k=2) were used to calibrate the thermometer. FIXED POINT TEMPERATURE UNCERTAINTY (point) (type) T90 (K) t90 ( C) (mk, estimated) LN 2 Comp ±2.3 Hg TP ±1.4 H 2 O TP ±0.4 Sn FP ±2.5 Zn FP ±2.8 Page 30 Thermocouple test system Page 31 Thermocouple Cal report excerpt Many physical cals have associated standard methods The last sentence answers the question, Why do we have to send thermocouples in for calibration? Page 32 Optical Wavelength Standard Standard Reference Material (SRM) precisely absorbs light at 1531 nm with an expanded uncertainty (coverage factor k=2) of ± nm. Page 33 Precision lengths for OTDR characterization Page 34 NIST Time & Frequency Measurement and Analysis System Page 35 Close-up: NIST Time & Frequency Page 36 Frequency Standards calibration capability Page 37 RF & MW stations Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Roseville (Sacramento) Laboratory Technologies Page Page 45 NIST Microwave Power Primary Standard NIST Water Bath Courtesy of Ron Ginley, Section Head, RF Measurements, NIST, Boulder, CO Page 46 Power Sensor Calibration Traceability Example Calibration Standard or System Cal factor measurement uncertainty: TAT (days) NIST/NMI primary standard - X NIST/NMI CN mount - X NIST/NMI thermistor cal (such as 8487B) 8 GHz (see curve) 8 12 weeks weeks Roseville Standards Lab (8487A-H84) Roseville Keysight cal + uncertainty (8487A) 8 GHz 15 days 8 GHz 7 days Page 47 Page 48 Cal Factor Measurement uncertainty (%) Power Sensor Cal Accuracy Choices (8481A) Keysight cal+ Unc. 7 days H84 Stds Lab Cal 15 days NMI CAL 8-12 weeks A Unc/Keysight cal 8481A-H84 Unc/Roseville 8478A Unc/ NPL 0 Frequency GHz Page 49 Traceability RF Power Measurement example Primary SI NMI 0 Lab Reference Standard 1 Stds. Lab Cal opt. H84 2 Keysight Cal + 3 Uncertainties Normal use case 4 Primary Std. Calorimeter Page 50 Attenuator Calibration Page 51 Roseville Standards Lab Screen room Page 52 Summary comments Page 53 Page 54 Keysight Standards Lab Capabilities Electro-Optics RF, Microwave, Millimeter Wave Dimensional /Optical Physical Electrical Attenuation Antenna Gain Angle Air Velocity AC-DC Difference Color Attenuation Flatness Density AC Current Fiber Optic Power Frequency Length Dew/Frost Point AC Voltage Laser Power * Impedance Magnification Force Capacitance Luminous Intensity Temperature Wavelength Impedance, Reflection Coefficient Linear Antenna Probe On-Axis Polarization Gain, Axial Ratio, Tilt Angle Main Component Pattern Amplitude, Phase Noise Temperature, Excess Noise Ration (ENR) Phase Noise Phase Shift Power Straightness/ Parallelism Thread Lead Gas Flow Rate Helium Leak Humidity Mass Pressure Temperature Torque Vacuum DC Ratio DC Resistance DC Voltage Inductance Phase Angle Ratio, AC Current Ratio, AC Voltage Sinusoidal/Shock Sensitivity keysight.com/find/standardslab Newly added Keysight capabilities Page 55 Call to action For any of the disciplines mentioned in this Webcast ask us if we can offer a Standards Lab calibration for your reference Lab standards. at what uncertainties?... and turnaround time & cost. Page 56 Page 57 Keysight Standards Lab Capabilities Electro-Optics RF, Microwave, Millimeter Wave Dimensional /Optical Physical Electrical Attenuation Antenna Gain Angle Air Velocity AC-DC Difference Color Attenuation Flatness Density AC Current Fiber Optic Power Frequency Length Dew/Frost Point AC Voltage Laser Power * Impedance Magnification Force Capacitance Luminous Intensity Temperature Wavelength Impedance, Reflection Coefficient Linear Antenna Probe On-Axis Polarization Gain, Axial Ratio, Tilt Angle Main Component Pattern Amplitude, Phase Noise Temperature, Excess Noise Ration (ENR) Phase Noise Phase Shift Power Straightness/ Parallelism Thread Lead Gas Flow Rate Helium Leak Humidity Mass Pressure Temperature Torque Vacuum DC Ratio DC Resistance DC Voltage Inductance Phase Angle Ratio, AC Current Ratio, AC Voltage Sinusoidal/Shock Sensitivity keysight.com/find/standardslab Newly added Keysight capabilities Page 58
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