Calculating Heart Rate from CRT Display for Beginners

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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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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.
 
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.