CET Test Equipment and Measurements 3

Question 1

Probe compensation adjustment on an oscilloscope is performed to:

Accepted Answer

Match the probe's capacitance to the oscilloscope input for flat frequency response

Answer

Probe compensation trims the probe's capacitor to match the oscilloscope input impedance, ensuring accurate, flat frequency response across the probe's bandwidth.

Question 2

What does the acronym VSWR stand for in RF measurements?

Accepted Answer

Voltage Standing Wave Ratio

Answer

VSWR (Voltage Standing Wave Ratio) quantifies the degree of impedance mismatch in an RF transmission line, with 1:1 indicating a perfect match.

Question 3

What is the primary purpose of a vector network analyzer (VNA)?

Accepted Answer

To measure S-parameters, impedance, and frequency response of RF components

Answer

A VNA measures S-parameters (such as return loss S11 and insertion loss S21), impedance, and phase of RF and microwave components across frequency.

Question 4

True RMS multimeters are essential when measuring:

Accepted Answer

Non-sinusoidal AC waveforms such as square waves or distorted signals

Answer

True RMS meters correctly measure the effective (RMS) value of any waveform shape, while average-responding meters are only accurate for pure sine waves.

Question 5

Rise time of a signal measured on an oscilloscope is conventionally defined as the time for the signal to transition from:

Accepted Answer

10% to 90% of final amplitude

Answer

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.

(CET) Certified Electronics Technician Practice Test

(CET) Certified Electronics Technician Practice Test

CET Test Equipment and Measurements 3