Shanghai Diamond Card can measure pulse stopwatch
Stopwatch is a commonly used measuring instruments. Also known as "mechanical stop watch." By the pause button, clockwork head, minute hand and other components.
All know that stopwatches are designed to measure time periods, but they are mostly used for sports athletics or scientific experiments, but there is a section specifically designed to measure people's pulse and should be designed specifically for medical staff; If you just use the ordinary watch to test the pulse of your body, you have to pulse the pulse, read your heart count, and watch your watch. The process usually takes a minute.
The Shanghai Diamond Card can measure the pulse of the stopwatch, it is no different from other stopwatch, but at the bottom of the dial more than about half a circle of multi-scale, is red, the value from 40 to 200; The specific use is: Hold the table with his left hand, thumb hold the watch ready to start, the right hand to touch the wrist pulse was measured, and then start the stopwatch, until the pulse count to 15, immediately stopped stopwatch, then the pointer below the dial The corresponding number of red scale, is the number of beats per minute of the person being tested.
The advantage of using it is that the measurement time is short, fast and accurate. Even if the family now has an electronic sphygmomanometer, it is still the easiest, most convenient and portable meter for measuring people's pulse. I now often take the rope tied to the waist, the daily "three provinces Wu body," because I am now high blood pressure, and heart rate and blood pressure have a direct relationship, as always monitor self physical condition, with this stopwatch I feel Very useful.
In the early years of this domestic stopwatch selling 80-90 yuan, now the flea market, which is about 100 yuan or so, and similar electronic products, it is very mechanical taste, in the hands of the special tradition, but also a little put the show.
Precautions for using stopwatch
1. Before use, tighten the clockwork, but do not be too tight, so as not to damage the clockwork; be sure to use before the test table, the key to see if there is a problem, the recording time is accurate.
2. Use, with the thumb knuckles or index finger second knuckles buttoned, and the stopwatch against their own chest, not in any swing arm to complete the key. Do not press the table too hard, to prevent damage to the parts;
3. Back to the table, if the second hand does not point zero, should note its value (zero point reading), subtract from the measured value after the test (note the symbol); use the right angle and the right power when the button, try not to Press at the edge of the button or bevel to avoid getting stuck or broken buttons.
4. Do not open the stopwatch after the stopwatch hanging around your neck or on the pocket to prevent running stopwatch keys collide with the body, causing an unexpected stop or open.
5. Special attention should be given to prevent breaking the stopwatch, when not in use must be placed in the middle of the box after the experiment.
6 should pay attention to open the table for the signal of smoke, stop the table with the finish line straight, can not oblique look.
How to stopwatch
Large circle for the second, the small circle is divided into big circle is 30 points grid (the top of the write is 30, there may be 60 cells, indicating the accuracy to half a second), a small circle in one minute is divided into two small cells, read the whole If after a small grid, add half a minute on the large circle of seconds, if not, directly read the large circle of seconds.
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