The Practical Telephone Handbook : And Guide to the Telephonic Exchange
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In our eReader you can find the full English version of the book. Read The Practical Telephone Handbook : And Guide to the Telephonic Exchange 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 The Practical Telephone Handbook : And Guide to the Telephonic Exchange
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To quickly assess the difficulty of the text, read a short excerpt:
Insulation Resistance. — This is the measure of the resistance of the insulating materials used to confine Fig. 251.
the current to the required path through the line, and may be obtained by means of the Wheatstone bridge when the total resistance does not exceed 1,111,000 ohms (= I'll I megohms), (as in the case of long open lines), by connecting one end of the line as shown in Fig. 25 1, keeping the other end insulated, the terminal E and battery being earthed. It will need the 1,000 MLkCTRlC...AL MEASUREMENtS.
ioS ohms resistance in b and the loohms in a, the balancing resistance in R being then multiplied by lOO to get the absolute resistance. The number thus obtained, mul- tiplied by the length of the line in miles, will give the resistance per mile of the wire.
It will be neces- sary to U£e a strong battery for this test, and the galvanometer used should be a sensitive one.
For measure- ments of high in- sulation and very accurate tests it is necessary to employ a Kelvin Astatic Reflecting Gal- vanometer.
What to read after The Practical Telephone Handbook : And Guide to the Telephonic Exchange?
You can find similar books in the "Read Also" column, or choose other free books by J Poole to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Insulation Resistance. — This is the measure of the resistance of the insulating materials used to confine Fig. 251.
the current to the required path through the line, and may be obtained by means of the Wheatstone bridge when the total resistance does not exceed 1,111,000 ohms (= I'll I megohms), (as in the case of long open lines), by connecting one end of the line as shown in Fig. 25 1, keeping the other end insulated, the terminal E and battery being earthed. It will need the 1,000 MLkCTRlC...AL MEASUREMENtS.
ioS ohms resistance in b and the loohms in a, the balancing resistance in R being then multiplied by lOO to get the absolute resistance. The number thus obtained, mul- tiplied by the length of the line in miles, will give the resistance per mile of the wire.
It will be neces- sary to U£e a strong battery for this test, and the galvanometer used should be a sensitive one.
For measure- ments of high in- sulation and very accurate tests it is necessary to employ a Kelvin Astatic Reflecting Gal- vanometer.
What to read after The Practical Telephone Handbook : And Guide to the Telephonic Exchange?
You can find similar books in the "Read Also" column, or choose other free books by J Poole to read onlineMoreLess
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