CCT Electrical & Electronic Calibration Flashcards
6 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCT Electrical & Electronic Calibration flashcards as text
What is the typical input impedance of a modern calibration-grade digital multimeter on its voltage function?
Answer: 10 MΩ
Calibration-grade digital multimeters typically have an input impedance of 10 MΩ on their voltage ranges, which minimizes loading effect on the circuit under test.
When calibrating a power analyzer, which quantity represents the product of RMS voltage and RMS current regardless of phase angle?
Answer: Apparent power in volt-amperes
Apparent power (VA) is the product of RMS voltage and RMS current without regard to phase angle, while true power (W) accounts for the phase relationship between voltage and current.
What is the function of a precision voltage divider in electrical calibration?
Answer: To accurately reduce a high voltage to a lower, calibrated ratio for safe measurement or comparison
A precision voltage divider accurately reduces high voltages to lower, known ratios, allowing calibration of high-voltage instruments using lower-range reference standards.
In calibrating frequency counters, what type of reference oscillator provides the highest long-term frequency stability?
Answer: GPS-disciplined oscillator (GPSDO) or cesium atomic oscillator
GPS-disciplined oscillators and cesium atomic oscillators provide the highest long-term frequency stability, with uncertainties traceable to atomic time standards, making them ideal for calibrating frequency counters.
What does 'dielectric absorption' mean when calibrating capacitance standards?
Answer: A phenomenon where a capacitor slowly recovers charge after being discharged, causing measurement errors
Dielectric absorption causes a discharged capacitor to slowly recover a portion of its charge due to polarization in the dielectric material, which can introduce errors in precision capacitance measurements.
Which calibration method is used to determine and remove systematic offset errors from an electrical measuring instrument?
Answer: Zero and span calibration (two-point calibration)
Zero and span (two-point) calibration adjusts the instrument at both its zero point and a known upper-range value, correcting systematic offset and gain errors across the measurement range.