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A frequency counter needs to measure a frequency of 30 Hz. If the gating time is 2 seconds then determine how many times the trigger level has been crossed?
- a)30
- b)60
- c)15
- d)50
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
A frequency counter needs to measure a frequency of 30 Hz. If the gati...
Concept:
Digital frequency counters that use a direct counting approach count the number of times the input signal crosses a given trigger voltage (and in a given direction, e.g. moving from negative to positive) in a given time. This time is known as gate time.
The frequency is equal to the number of crossings of the trigger level in one second. Therefore
Frequency=Trigger level crossing/Gatetime
Calculation:
Given;
Gate time = 2 sec
Frequency = 30 Hz
Then;
Frequency=Trigger level crossing/Gatetime
∴Trigger level crossing = frequency × gate time = 30 × 2 = 60
Digital frequency counters that use a direct counting approach count the number of times the input signal crosses a given trigger voltage (and in a given direction, e.g. moving from negative to positive) in a given time. This time is known as gate time.
The frequency is equal to the number of crossings of the trigger level in one second. Therefore
Frequency=Trigger level crossing/Gatetime
Calculation:
Given;
Gate time = 2 sec
Frequency = 30 Hz
Then;
Frequency=Trigger level crossing/Gatetime
∴Trigger level crossing = frequency × gate time = 30 × 2 = 60
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Community Answer
A frequency counter needs to measure a frequency of 30 Hz. If the gati...
To determine the number of times the trigger level has been crossed, we need to consider the frequency of the signal and the gating time.
Frequency of the signal: 30 Hz
Gating time: 2 seconds
To calculate the number of times the trigger level has been crossed, we can use the formula:
Number of crossings = Frequency * Gating time
Let's plug in the given values:
Number of crossings = 30 Hz * 2 seconds
Number of crossings = 60
Hence, the correct answer is option 'B' - 60.
Explanation:
Let's break down the calculation step by step:
1. Frequency of the signal: 30 Hz
This means that the signal completes 30 cycles in one second.
2. Gating time: 2 seconds
The gating time is the duration for which the frequency counter counts the number of crossings. In this case, the gating time is 2 seconds.
3. Number of crossings = Frequency * Gating time
Substituting the values, we get:
Number of crossings = 30 Hz * 2 seconds
Number of crossings = 60
Therefore, the trigger level has been crossed 60 times within the given gating time of 2 seconds.
Note: It is important to understand that the frequency counter counts the number of crossings of the signal above the trigger level within the specified gating time. This count can be used to determine the frequency of the signal accurately.
Frequency of the signal: 30 Hz
Gating time: 2 seconds
To calculate the number of times the trigger level has been crossed, we can use the formula:
Number of crossings = Frequency * Gating time
Let's plug in the given values:
Number of crossings = 30 Hz * 2 seconds
Number of crossings = 60
Hence, the correct answer is option 'B' - 60.
Explanation:
Let's break down the calculation step by step:
1. Frequency of the signal: 30 Hz
This means that the signal completes 30 cycles in one second.
2. Gating time: 2 seconds
The gating time is the duration for which the frequency counter counts the number of crossings. In this case, the gating time is 2 seconds.
3. Number of crossings = Frequency * Gating time
Substituting the values, we get:
Number of crossings = 30 Hz * 2 seconds
Number of crossings = 60
Therefore, the trigger level has been crossed 60 times within the given gating time of 2 seconds.
Note: It is important to understand that the frequency counter counts the number of crossings of the signal above the trigger level within the specified gating time. This count can be used to determine the frequency of the signal accurately.
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A frequency counter needs to measure a frequency of 30 Hz. If the gating time is 2 seconds then determine how many times the trigger level has been crossed?a)30b)60c)15d)50Correct answer is option 'B'. Can you explain this answer?
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