Testing Instruments

Radio Record, Volume III, Issue 28, 24 January 1930, Page 31

Testing Instruments

"THE majority. of listeners "usually * contrive to manage without a voltmeter or ammeter, but those who possess one generally ‘find’ that a ‘cheap instrument for measuring A and B battery voltages is sufficient for their needs. On the.other hand, the serious ‘experimenter finds that: accurate measuring instruments are a real necessity, for without them it is impossible: to ascertain whether the set is working up to a standard; any falling off in current consumption is. instantly: reflected in the tell-tale needle. Only meters of the moying-coil type are completely satisfactory for this work.’ In addition to serving as a ‘check on the set an accurate measuring instrument like a milliameter is of valuable assistance in tracing faults. It is a good plan to connect a milliameter in the B battery circuit and‘ an ammeter in the A battery circuit so that an instant. check of the current consumption from both batteries is available. ---aEaEE