You have made a home made probe to measure digital signals on an oscilloscope. The probe reduces probe loading. Which of the following is/are true. There can be more than one correct statement.Question 3Select one or more:1.You will not get reflections as long as you just use a 50 ohm co-ax cable.2.You use a coax as cable. This goes directly to the scope channel input through a 50 ohm termination.3.The probe factor (scaling) will change if you use a 50 ohm termination on the scope input.4.The coax cable must have a characteristic impedance of 50 ohm if a 50 ohm termination is used at the scope.5.You use a coax as cable. This goes directly to the scope channel input.
Question
You have made a home made probe to measure digital signals on an oscilloscope. The probe reduces probe loading. Which of the following is/are true. There can be more than one correct statement.Question 3Select one or more:1.You will not get reflections as long as you just use a 50 ohm co-ax cable.2.You use a coax as cable. This goes directly to the scope channel input through a 50 ohm termination.3.The probe factor (scaling) will change if you use a 50 ohm termination on the scope input.4.The coax cable must have a characteristic impedance of 50 ohm if a 50 ohm termination is used at the scope.5.You use a coax as cable. This goes directly to the scope channel input.
Solution
The correct statements are:
- You use a coax as cable. This goes directly to the scope channel input through a 50 ohm termination.
- The probe factor (scaling) will change if you use a 50 ohm termination on the scope input.
- The coax cable must have a characteristic impedance of 50 ohm if a 50 ohm termination is used at the scope.
- You use a coax as cable. This goes directly to the scope channel input.
Statement 1 is not necessarily true because using a 50 ohm co-ax cable does not guarantee that you will not get reflections. Reflections can occur due to impedance mismatches anywhere along the signal path, not just at the probe tip. Therefore, even if you use a 50 ohm co-ax cable, you could still get reflections if there are impedance mismatches elsewhere in the signal path.
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