ISCET Test Equipment and Measurement Questions and Answers

Question 1

A technician observes a waveform on an oscilloscope that spans 4.5 vertical divisions from its highest to its lowest point.
If the volts/division control is set to 2 V/div, what is the peak-to-peak voltage (Vpp) of the signal?

Accepted Answer

9.0 Vpp

Answer

2.25 Vpp

Answer

4.5 Vpp

Answer

11.0 Vpp

Question 2

When troubleshooting a complex digital system with a microprocessor and multiple data lines, which piece of test equipment is best suited for capturing and analyzing the timing relationships between many digital signals simultaneously?

Accepted Answer

Logic Analyzer

Answer

Spectrum Analyzer

Answer

Digital Multimeter

Answer

Function Generator

Question 3

A technician needs to measure a small AC ripple voltage riding on top of a large DC power supply output. Which oscilloscope input coupling setting is most appropriate for this measurement?

Accepted Answer

AC Coupling

Answer

DC Coupling

Answer

GND Coupling

Answer

HF Reject

Question 4

What is the primary advantage of using a True RMS multimeter compared to a more basic averaging (mean-responding) multimeter?

Accepted Answer

It provides more accurate measurements of non-sinusoidal AC waveforms.

Answer

It can measure higher levels of DC voltage.

Answer

It has a significantly higher input impedance for all measurements.

Answer

It measures resistance with greater precision.

Question 5

When using a digital multimeter to measure resistance, the display shows "OL". What does this indicate?

Accepted Answer

The measured resistance is too high for the selected range, or the circuit is open.

Answer

The multimeter's battery is low.

Answer

The resistance is zero ohms (a short circuit).

Answer

The test leads are connected to the wrong input jacks.

Question 6

Why must a circuit be completely de-energized before a technician can safely and accurately measure resistance with an ohmmeter?

Accepted Answer

External voltage can cause inaccurate readings and may damage the ohmmeter.

Answer

The ohmmeter's display will not light up if external voltage is present.

Answer

The ohmmeter can only measure negative resistance values in a live circuit.

Answer

AC voltage in the circuit will charge the ohmmeter's internal battery.

A technician observes a waveform on an oscilloscope that spans 4.5 vertical divisions from its highest to its lowest point.If the volts/division control is set to 2 V/div, what is the peak-to-peak voltage (Vpp) of the signal?

A technician observes a waveform on an oscilloscope that spans 4.5 vertical divisions from its highest to its lowest point.
If the volts/division control is set to 2 V/div, what is the peak-to-peak voltage (Vpp) of the signal?