Radio doings (Dec 1930-Jun1932)

Record Details:

Title:
Radio doings
Date:
Dec 1930-Jun1932
Publisher:
[Los Angeles, etc.] : Doubleday, Page & Co. 19.
Volume:
Radio doings; "the Red book of radio" ... 
Leaf #:
000183
Language:
English
Subjects:
Radio broadcasting -- Pacific States -- Periodicals, Radio programs -- Pacific States -- Periodicals","Radio personalities -- Periodicals.
Contributor:
University of Maryland, College Park
Sponsor:
LYRASIS Members and Sloan Foundation
Coordinator:
Media History Digital Library
Date Added:
March 28, 2024
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March, 1931 RADIO DOINGS Page Twenty-nine For The Service Man Tig.l Pig. 2 Tig. 3 Tig. 4 TO MAKE aB.C, VOLTMETER a MULT I -RAN 05 VOLTMETER . Rv= resistance of voltmeter in ohms, or, if ohms per volt is given, then Rv= ©has per rolt x maximum reading, in volts. Vi«* original maximum reading, in volts. T253 desired new maximum reading, in volts. V2 ^r« If « multiplying factor. Rjj— resistance of multiplier needed, in ohms. Then %=» (N-l)x Rv TO HAKE a D.C. MILLIAMETER a D.C. VOLTMETER. I « original maximum reading, in milliamperes V =* desired maximum reading, in volts. Ra" resistance of multiplier required, in ohmi Then 000 x V T TO FIND THE SHUNT REQUIRED TO MAKE ANY D.C. MILLIAMBTER A HIGHER RANGE MILLIAMETER. Rm=* re si stance of meter, in ohms. Im = original maximum reading, in milliamperes. I «desired new maximum reading, in milliamperes. -H» multiplying factor. R8 m resistance of shunt required, in ohms. Then RB~ Rm 8 N-l If the meter resistance is not accurately known, greater accuracy in scale conversion may be had by the use of two Precision Wire Wound Resistors, aa shown in Pig. 4. Rm= approximate meter resistance, as from manufacturer's catalog. Rk»a resistor, equal, in ohms, to 9 times Rm. Vote Then R Rfcjgg _ 10 Rm B N-l N-l Tot intermittent use, it is recommended that th« load on any Precision Wire Wound Resistor should not exceed 2 watts