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G4B09

AMATEUR RADIO PRACTICES · - Tests and test equipment

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When is an analog multimeter preferred to a digital multimeter?

  1. AWhen testing logic circuits
  2. BWhen high precision is desired
  3. CWhen measuring the frequency of an oscillator
  4. DWhen adjusting circuits for maximum or minimum values
Why An analog meter's moving needle gives you a continuous visual sense of which way a reading is heading, so when you tune a circuit for a peak or a null you can watch the needle swing and stop at the turning point. A digital display just throws up a string of numbers that jump around and lag, making it hard to see the trend while your hand is on the adjustment. That is why analog meters survive in tuning, peaking, and nulling work like adjusting a trap or dipping a stage.
Watch out High precision favors the digital meter, which typically resolves 3.5 digits or more and has no parallax or needle friction error. Frequency is measured with a counter, not a multimeter, and logic circuits are checked with a logic probe or scope.
Needle for trends, digits for numbers: watch the swing when peaking or nulling.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of G4B

  1. G4B01 What item of test equipment contains horizontal and vertical channel amplifiers?
  2. G4B02 Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
  3. G4B03 Which of the following is the best instrument to use for checking the keying waveform of a CW transmitter?
  4. G4B04 What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope patter…
  5. G4B05 Why do voltmeters have high input impedance?
  6. G4B06 What is an advantage of a digital multimeter as compared to an analog multimeter?
  7. G4B07 What signals are used to conduct a two-tone test?
  8. G4B08 What transmitter performance parameter does a two-tone test analyze?
  9. G4B09 When is an analog multimeter preferred to a digital multimeter?
  10. G4B10 Which of the following can be determined with a directional wattmeter?
  11. G4B11 Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
  12. G4B12 What effect can strong signals from nearby transmitters have on an antenna analyzer?
  13. G4B13 Which of the following can be measured with an antenna analyzer?
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