Principles of Electric and Magnetic Measurements |
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Page 84
... junction . cold When a circuit is made of wires of two or more different metals and one junction is maintained at a temperature different from the temperature of the rest of the circuit , an e.m.f. is produced at the junction , and a ...
... junction . cold When a circuit is made of wires of two or more different metals and one junction is maintained at a temperature different from the temperature of the rest of the circuit , an e.m.f. is produced at the junction , and a ...
Page 88
... junctions and galvanometers . 6. Heater and Vacuo - junction . In this instrument the heater is only 5 or 6 mm . long , and is surrounded by a very thin tube of quartz , round which the wire , with the junction in the middle , is coiled ...
... junctions and galvanometers . 6. Heater and Vacuo - junction . In this instrument the heater is only 5 or 6 mm . long , and is surrounded by a very thin tube of quartz , round which the wire , with the junction in the middle , is coiled ...
Page 89
... junctions the heater and junction were soldered together ; this was a disadvantage , because the potential of the heater was fixed by that of the galvanometer circuit , which , at radio frequency , is always very close to zero . Another ...
... junctions the heater and junction were soldered together ; this was a disadvantage , because the potential of the heater was fixed by that of the galvanometer circuit , which , at radio frequency , is always very close to zero . Another ...
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accuracy adjusted alternating current ammeter ampere angle anode approximately axis balance ballistic bridge C₁ calculated calibration capacitance cathode cell condenser conductor connected connexion constant copper curve damping deflection determined direct current disc eddy currents effect electric electrodes electromagnet employed equal equation ferromagnetic field-strength flux density galvanometer grid heater hysteresis impedance increased induced e.m.f. inductometer instrument insulation ions Kc/s known length loop magnetic circuit magnetic field magnetizing coil magnetizing current magnetizing force magnetometer material maximum means measured meter method metre moving coil multivibrator mutual inductance needle number of turns obtained ohms oscillations oscillograph permeability permeameter plate position potential potentiometer produced proportional quartz radio frequencies ratio reading resistance resonance reversed rotation search-coil secondary sensitivity shown in fig shunt specimen standard strips suitable tance temperature terminals torque torsion transformer tube uniform usually variable varies vertical vibration voltage voltmeter volts wattmeter Wheatstone bridge winding wire wound zero