Test Equipment and Measurements 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 Test Equipment and Measurements flashcards as text
Probe compensation adjustment on an oscilloscope is performed to:
Answer: Match the probe's capacitance to the oscilloscope input for flat frequency response
Probe compensation trims the probe's capacitor to match the oscilloscope input impedance, ensuring accurate, flat frequency response across the probe's bandwidth.
What does the acronym VSWR stand for in RF measurements?
Answer: Voltage Standing Wave Ratio
VSWR (Voltage Standing Wave Ratio) quantifies the degree of impedance mismatch in an RF transmission line, with 1:1 indicating a perfect match.
What is the primary purpose of a vector network analyzer (VNA)?
Answer: To measure S-parameters, impedance, and frequency response of RF components
A VNA measures S-parameters (such as return loss S11 and insertion loss S21), impedance, and phase of RF and microwave components across frequency.
True RMS multimeters are essential when measuring:
Answer: Non-sinusoidal AC waveforms such as square waves or distorted signals
True RMS meters correctly measure the effective (RMS) value of any waveform shape, while average-responding meters are only accurate for pure sine waves.
Rise time of a signal measured on an oscilloscope is conventionally defined as the time for the signal to transition from:
Answer: 10% to 90% of final amplitude
Rise time is measured from 10% to 90% of the final amplitude to exclude rounding and overshoot at the very beginning and end of the transition.
Which instrument or technique is most appropriate for measuring the phase difference between two electronic signals?
Answer: Dual-trace oscilloscope or dedicated phase meter
A dual-trace oscilloscope displays two signals simultaneously, allowing direct visual measurement of their phase difference by comparing timing.
When calibrating test equipment, a NIST-traceable calibration standard ensures:
Answer: Measurements can be traced to national standards for verified accuracy
NIST-traceable calibration links measurement results to the National Institute of Standards and Technology reference standards, guaranteeing accuracy and cross-lab consistency.