Practical Electrical Measurement
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In our eReader you can find the full English version of the book. Read Practical Electrical Measurement Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Practical Electrical Measurement
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The standard instrument is made so that a division of -Ajth per cent, causes considerable deflection.
This is perhaps the most accurate way of calibrating from a standard ammeter, as the other methods are limited by the possibility of reading the scale of the standard.
The standard instrument must be carefully calibrated throughout its scale to begin with, and must be checked every month or so to make sure that the controlUng magnet, if there is one, is not weakened at all. If it is weakened th...e magnet must be moved closer to the needle, or the deflecting coil must be moved further from it. The standard instrument may be calibrated to begin with by making up a special resistance and • working from the standard cell, or by deposition, as will be presently described.
So far most of the arrangements described have given currents increasing ampere by ampere, the main current being altered by resistance till it is the required number of amperes.
In Prof. Fleming's arrangement, which will now be described, the current is altered by a resistance to any approximate value, and this value is measured by means of a potentiometer.
What to read after Practical Electrical Measurement?
You can find similar books in the "Read Also" column, or choose other free books by James Swinburne to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The standard instrument is made so that a division of -Ajth per cent, causes considerable deflection.
This is perhaps the most accurate way of calibrating from a standard ammeter, as the other methods are limited by the possibility of reading the scale of the standard.
The standard instrument must be carefully calibrated throughout its scale to begin with, and must be checked every month or so to make sure that the controlUng magnet, if there is one, is not weakened at all. If it is weakened th...e magnet must be moved closer to the needle, or the deflecting coil must be moved further from it. The standard instrument may be calibrated to begin with by making up a special resistance and • working from the standard cell, or by deposition, as will be presently described.
So far most of the arrangements described have given currents increasing ampere by ampere, the main current being altered by resistance till it is the required number of amperes.
In Prof. Fleming's arrangement, which will now be described, the current is altered by a resistance to any approximate value, and this value is measured by means of a potentiometer.
What to read after Practical Electrical Measurement?
You can find similar books in the "Read Also" column, or choose other free books by James Swinburne to read onlineMoreLess
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