5343 HW2

1 thru 25

The ISO/IEC 17025 standard defines the requirements for a test lab to deliver reliable test and _________ services.

calibration

The ISO/IEC 17025 standard allows test reports and calibration ___________ generated in one lab to be accepted by labs in other countries without additional testing.

certificates

Measurement uncertainty is the statistical __________ of the values attributed to a measured quantity.

spread

The typical measure used in a measurement uncertainty is the standard __________ .

deviation

When calculating measurement uncertainty you identify relevant physical variables, and research what may cause them to ________.

vary

Which one of these items are used in data reduction and analysis when performing a measurement uncertainty study? Past calibration reports, product manuals, R&R studies, product spec sheets, product performance data in the field.

all of the above

When calculating measurement uncertainty you identify the probability ________________ for each uncertainty contributor.

distribution

A measurement uncertainty estimate must be ____________ than the reference standard reported in your equipment’s calibration certificate.

larger

Accuracy is the difference between the output value of a sensor and the ____________ value of the output as measured by a perfect calibration standard.

actual

The accuracy spec consists of a __________ error due to statistical bias of the sensor, and a random error, the result of statistical variability.

systematic

Random errors are not ______________ on an individual basis.

predictable

The precision of a measurement system is the degree to which repeated measurements by a consistent calibration process show the same ________.

results

A precise sensor has a ____________ distribution when its output data is plotted on a normal curve.

narrow

Which one of these items affect the measurement uncertainty attributed to a sensor? Ambient temperature, linearity, calibration errors, hysteresis.

all of the above

Linearity error is a systematic error that defines the degree to which a percentage change in _________ is not reflected in the same percentage change in sensor output.

input

Linearity error is measured after you use __________ techniques to create a linear curve for your sensor.

best-fit

Hysteresis is the maximum difference that can be measured between corresponding pairs of data points obtained by running an _____________ sequence of inputs.

ascending and descending

Which one of these items affects the value of hysteresis? Ambient temperature, previous usage, span of measurement cycle, exposure time.

all of the above

Traceability is a method of tracing the results of a calibration to a reference source through an ___________ of calibrations.

unbroken chain

For sensors with multiple measurement capability, each value must be ____________ to a calibration hierarchy.

traceable

The measurement uncertainty of each instrument in the calibration chain __________ the measurement uncertainty of your equipment.

increases

A calibration certificate contains model & serial number, internal calibration equipment used, manufacturer name, and device description.

all of the above

In a piece of calibration equipment the reference standard must have _____ accuracy than the sensor under test.

higher

In one type of pressure calibration equipment a high-pressure pump fills a reservoir with pressurized fluid and a reference _____________ measures the actual pressure.

digital pressure gauge

In a second type of pressure calibration equipment a set of _________ push down on a fluid cylinder to pressurize the reservoir.

weights