Difference between revisions of "Single ended - Floating"
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| − | This is a | + | Single Ended Floating signals which are not electrically connected to ground. The signal appears between the two terminals of the signal source. This signal can either be a voltage source or a current source. |
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| + | An ideal voltage source has a near zero internal impedance - a battery for example. A pH electrode is a voltage source but this has a very high internal resistance. An accurate reading can only be obtianed with a measuring circuit whose own internal resistance is much higher than the source resistance of the source. Voltmeters therefore need to have a high internal reistance - ideally infinite. | ||
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| + | An ideal current Source has a near infinite internal impedance - a solar cell. In this case to measure the source current the measurment impedance should be very low. Ammeters therefore need to have a low internal resistance - ideally zero. | ||
Here is a picture: | Here is a picture: | ||
| − | [[File:SE-Floating Source.svg]] | + | [[File:SE-Floating Source.svg|100 px]] |
Latest revision as of 18:29, 13 September 2013
Single Ended Floating signals which are not electrically connected to ground. The signal appears between the two terminals of the signal source. This signal can either be a voltage source or a current source.
An ideal voltage source has a near zero internal impedance - a battery for example. A pH electrode is a voltage source but this has a very high internal resistance. An accurate reading can only be obtianed with a measuring circuit whose own internal resistance is much higher than the source resistance of the source. Voltmeters therefore need to have a high internal reistance - ideally infinite.
An ideal current Source has a near infinite internal impedance - a solar cell. In this case to measure the source current the measurment impedance should be very low. Ammeters therefore need to have a low internal resistance - ideally zero.
Here is a picture:
