A-003 — Measurements

Measurements: meters, oscilloscopes, counters, signal generators, and what a reading actually tells you.

All 66 questions

• A-003-001-001 What is the easiest amplitude dimension to measure by viewing a pure sine wave on an oscilloscope?
• A-003-001-002 What is the RMS value of a 340 volt peak-to-peak pure sine wave?
• A-003-001-003 What is the equivalent to the RMS value of an AC voltage?
• A-003-001-004 If the peak value of a 100 Hz sinusoidal waveform is 20 volts, the RMS value is:
• A-003-001-005 In applying Ohm's law to AC circuits, current and voltage values are:
• A-003-001-006 The effective value of a sine wave of voltage or current is:
• A-003-001-007 AC voltmeter scales are usually calibrated to read:
• A-003-001-008 An AC voltmeter is calibrated to read the:
• A-003-001-009 Which AC voltage value will produce the same amount of heat as a DC voltage, when applied to the same resistance?
• A-003-001-010 What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?
• A-003-001-011 A sine wave of 17 volts peak is equivalent to how many volts RMS?
• A-003-002-001 The power supplied to the antenna transmission line by a transmitter during an RF cycle at the highest crest of the modulation envelope is known as:
• A-003-002-002 To compute one of the following, multiply the peak-envelope voltage by 0.707 to obtain the RMS value, square the result and divide by the load resistance. Which is the correct answer?
• A-003-002-003 Peak-Envelope Power (PEP) for SSB transmission is:
• A-003-002-004 The formula to be used to calculate the power output of a transmitter into a resistor load using a voltmeter is:
• A-003-002-005 It gives an indication of the resonant frequency of a circuit How is the output Peak-Envelope Power of a transmitter calculated if an oscilloscope is used to measure the Peak-Envelope Voltage across a dummy resistive load (where PEP = Peak-Envelope Power, PEV = Peak- Envelope Voltage, Vp = peak-voltage, RL = load resistance)?
• A-003-002-006 What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
• A-003-002-007 What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?
• A-003-002-008 What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?
• A-003-002-009 What is the output PEP from a transmitter, if an oscilloscope measures 400 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?
• A-003-002-010 What is the output PEP from a transmitter, if an oscilloscope measures 800 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?
• A-003-002-011 An oscilloscope measures 500 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output during unmodulated carrier conditions. What would an average-reading power meter indicate under the same transmitter conditions?
• A-003-003-001 What is a dip meter?
• A-003-003-002 What does a dip meter do?
• A-003-003-003 What two ways could a dip meter be used in an amateur station?
• A-003-003-004 A dip meter supplies the radio frequency energy which enables you to check:
• A-003-003-005 A dip meter may not be used directly to:
• A-003-003-006 The dial calibration on the output attenuator of a signal generator:
• A-003-003-007 What is a signal generator?
• A-003-003-008 A dip meter:
• A-003-003-009 Which two instruments are needed to measure FM receiver sensitivity for a 12 dB SINAD ratio (signal + noise + distortion over noise + distortion)?
• A-003-003-010 The dip meter is most directly applicable to:
• A-003-003-011 Which of the following is not a factor affecting the frequency accuracy of a dip meter?
• A-003-004-001 What does a frequency counter do?
• A-003-004-002 What factors limit the accuracy, frequency response and stability of a frequency counter?
• A-003-004-003 How can the accuracy of a frequency counter be improved?
• A-003-004-004 If a frequency counter with a time base accuracy of +/- 0.1 PPM (parts per million) reads 146 520 000 Hz, what is the most that the actual frequency being measured could differ from that reading?
• A-003-004-005 If a frequency counter, with a time base accuracy of 10 PPM (parts per million) reads 146 520 000 Hz, what is the most the actual frequency being measured could differ from that reading?
• A-003-004-006 The clock in a frequency counter normally uses a:
• A-003-004-007 The frequency accuracy of a frequency counter is determined by:
• A-003-004-008 Which device relies on a stable low-frequency oscillator, with harmonic output, to facilitate the frequency calibration of receiver dial settings?
• A-003-004-009 What is the traditional way of verifying the accuracy of a crystal calibrator?
• A-003-004-010 Out of the following oscillators, one is NOT, by itself, considered a high-stability reference:
• A-003-004-011 You want to calibrate your station frequency reference to the WWV signal on your receiver. The resulting beat tone must be:
• A-003-005-001 If a 100 Hz signal is fed to the horizontal input of an oscilloscope and a 150 Hz signal is fed to the vertical input, what type of pattern should be displayed on the screen?
• A-003-005-002 What factors limit the accuracy, frequency response and stability of an oscilloscope?
• A-003-005-003 How can the frequency response of an oscilloscope be improved?
• A-003-005-004 You can use an oscilloscope to display the input and output of a circuit at the same time by:
• A-003-005-005 An oscilloscope cannot be used to:
• A-003-005-006 The bandwidth of an oscilloscope is:
• A-003-005-007 When using Lissajous figures to determine phase differences, an indication of zero or 180 degrees is represented on the screen of an oscilloscope by:
• A-003-005-008 A 100-kHz signal is applied to the horizontal channel of an oscilloscope. A signal of unknown frequency is applied to the vertical channel. The resultant wave form has 5 loops displayed vertically and 2 loops horizontally. The unknown frequency is:
• A-003-005-009 An oscilloscope probe must be compensated:
• A-003-005-010 What is the best instrument to use to check the signal quality of a CW or single-sideband phone transmitter?
• A-003-005-011 What is the best signal source to connect to the vertical input of an oscilloscope for checking the quality of a transmitted signal?
• A-003-006-001 A meter has a full-scale deflection of 40 microamperes and an internal resistance of 96 ohms. You want it to read 0 to 1 mA. The value of the shunt to be used is:
• A-003-006-002 A moving-coil milliammeter having a full-scale deflection of 1 mA and an internal resistance of 0.5 ohms is to be converted to a voltmeter of 20 volts full-scale deflection. It would be necessary to insert a:
• A-003-006-003 A voltmeter having a range of 150 volts and an internal resistance of 150 000 ohms is to be extended to read 750 volts. The required multiplier resistor would have a value of:
• A-003-006-004 The sensitivity of an ammeter is an expression of:
• A-003-006-005 Voltmeter sensitivity is usually expressed in ohms per volt. This means that a voltmeter with a sensitivity of 20 kilohms per volt would be a:
• A-003-006-006 The sensitivity of a voltmeter, whose resistance is 150 000 ohms on the 150-volt range, is:
• A-003-006-007 The range of a DC ammeter can easily be extended by:
• A-003-006-008 What happens inside a multimeter when you switch it from a lower to a higher voltage range?
• A-003-006-009 How can the range of an ammeter be increased?
• A-003-006-010 Where should an RF wattmeter be connected for the most accurate readings of transmitter output power?
• A-003-006-011 At what line impedance do most RF wattmeters usually operate?