Calculating Heart Rate from CRT Display: A Guide for Beginners

  • Thread starter QueryQueen86
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In summary, the conversation discusses the operation of a CRT in a heart rate monitor. The time base is typically measured as time per distance, with a standard of 0.40s/cm. By measuring the distance between peaks on the display, one can calculate the time taken for one heart beat. The question also includes confusion about the time base measurement and how to approach the problem.
  • #1
QueryQueen86
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This question is on the operation of a CRT.

In a heart rate monitor, the time base is a standard 0.40s/ms.
The distance between adjacent peaks on the display is 1.25cm per heart beat.
Calculate the time taken for one heart beat.

Any help with this will be very much appreciated. I missed a few lectures due to illness and now I'm so behind. I don't even know where to start with this!
 
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  • #2
Welcome to PF.

I don't think I exactly understand your problem statement, because typically your oscilloscope will be given as time/div.

Now if you had said .40s/div then that would indicate to me that you have a .5sec peak to peak, for 1 heart beat, or 60/.5 = 120 beats per minute.
 
  • #3
QueryQueen86 said:
In a heart rate monitor, the time base is a standard 0.40s/ms.
You have copied this down wrong. The timebase must be time/distance, ie 0.4s/cm

Then if you measure the distance on the screen (1.25cm) and you know how fast the trace is moving you can work out how many seconds the 1.25cm represents.
 

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