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DC & Low Frequency Metrology |
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Martin Instrument Laboratories is capable of making many types of electrical measurements. Our quality system and measurement assurance programs are integral parts of providing traceable measurements. A computer controlled GPIB instrument network and automated calibration software allow us to log, analyze, and document large amounts of measurement and calibration data efficiently. Measurement assurance programs are maintained to validate our instrument’s calibrations, and their stability between regular calibrations. These measurement assurance programs also allow us to participate in advanced metrology studies. Martin Instrument Laboratories DC measurement assurance programs utilizes two Fluke 732B DC Reference Standards, a Fluke 752A Reference Divider, a Hewlett Packard 3458A Long Scale Digital Multimeter, and a Fluke 5500SC300 Multi-Product Calibrator. Our AC Low Frequency measurement assurance programs utilizes various Vacuum Thermal Converters, a GPS Time and Frequency Receiver with rubidium atomic clock and a low phase noise crystal oscillator. A VLF WWVB Time-Frequency Receiver/Comparator is also utilized.
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Regular phase comparisons with atomic clocks are made via the NIST provided WWVB 60kHz LF radio broadcast, and GPS satellite transmissions. These phase comparisons are used, among other things, to determine the aging characteristics of our field use, ovenized quartz oscillator. In this chart, corrections are not applied for the predicted regression of our field standard. However, I do like the above chart as it clearly shows the normal aging characteristics of a precision ovenized quartz oscillator which is heavily utilized in field calibrations. |
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Instrument Service |
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DC & LF Metrology |
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Pressure Metrology |
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Mass & Force Metrology |
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Resistance Metrology |
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Temperature Metrology |
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Gas Flow Metrology |
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Instrument Service |
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DC & LF Metrology |
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Pressure Metrology |
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Mass & Force Metrology |
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Resistance Metrology |
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Temperature Metrology |
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Gas Flow Metrology |
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Above a DC Volt measurement assurance program utilizes the Hewlett Packard 3458A long scale digital multimeter to directly measure one of the 732B reference standards. Corrections are applied for the bias and predicted regressions of the standards. Martin Instrument Laboratories utilizes this HP3458A to make over 100 GPIB automated measurements of our Fluke 5500A/SC300 calibrator between our onsite workloads. |
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The Fluke 732B DC Reference Standards are inter-compared to detect changes in their bias and regressions. Currently these standards are utilized for measurement assurance programs and metrology studies only and are not utilized for the direct transfer of traceable measurements. |