Data Quality & Completeness Flashcards
7 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Data Quality & Completeness flashcards as text
In a data logging system, 'data latency' refers to:
Answer: The time delay between when an event occurs and when it is recorded
Data latency is the delay from the actual occurrence of a measured event to when the data system captures and records it.
Which standard defines procedures for the calibration of electronic test and measurement equipment in the United States?
Answer: ANSI/NCSL Z540
ANSI/NCSL Z540 (now largely superseded by ISO/IEC 17025) established requirements for calibration laboratories and equipment calibration in the US.
A digital multimeter displays '0L' or 'OL' during a resistance measurement. This most likely indicates:
Answer: The resistance exceeds the selected range (overload)
OL (overload) on a DMM resistance measurement means the resistance is higher than the currently selected measurement range.
In electronics testing, 'golden unit testing' involves:
Answer: Comparing a device under test against a known-good reference unit
Golden unit testing compares the outputs of a device under test (DUT) against a verified reference unit to identify deviations.
What is the significance of 'uncertainty of measurement' in a calibration certificate?
Answer: It quantifies the range within which the true value is expected to lie with stated confidence
Measurement uncertainty is a parameter that characterizes the dispersion of values that could reasonably be attributed to the measurand, expressed at a specified confidence level.
A technician observes that a digital sensor gives different readings when the measured quantity is increasing versus decreasing. This phenomenon is known as:
Answer: Hysteresis
Hysteresis is the dependence of a sensor's output on whether the input is increasing or decreasing, resulting in different readings for the same input value.
When performing a four-wire (Kelvin) resistance measurement, the primary advantage over a two-wire measurement is:
Answer: Elimination of test lead resistance from the measurement
Four-wire measurement uses separate current-source and voltage-sensing leads so that lead resistance is excluded from the measured value.