When To Call a Doctor. Call or other emergency services immediately if you have vertigo (a spinning sensation) and: 1  You passed out (lost consciousness). 2  You have symptoms of a stroke, such as:  Sudden numbness, tingling, weakness, or loss of movement in your face, arm, or leg, especially on only one side of your body.
High quality deionized water has a conductivity of about 5.5 Î¼S/m, typical drinking water in the range of 5-50 mS/m, while sea water about 5 S/m (i.e., sea water's conductivity is one million times higher than that of deionized water).n alternating voltage is used in order to avoid electrolysis. The resistance is measured by a conductivity meter. Typical frequencies used are in the range 1â3 kHz. The dependence on the frequency is usually small, but may become appreciable at very high frequencies, an effect known as the DebyeâFalkenhagen effect.
1 Normal range up to 120 ms (3 small squares on ECG paper). 2  QT interval (measured from first deflection of QRS complex to end of T wave at isoelectric line). 3  Normal range up to 440 ms (though varies with heart rate and may be slightly longer in females).he amplitude, or voltage, of the recorded electrical signal is expressed on an ECG in the vertical dimension and is measured in millivolts (mV). On standard ECG paper 1mV is represented by a deflection of 10 mm.