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1949 - shown in an experimental arrangement, with the thermistor mount and coaxial switch at left

HIGH-FREQUENCY VOLTAGE STANDARD

E&MP 44.045

Electricity - High-frequency Voltage

March 11, 1949

Figure 1. a NEW PRIMARY RADIO-FREQUENCY VOLTAGE STANDARD DEVELOPED BY THE

National Bureau of Standards makes available high-precision voltages without any frequency corrections.

Effective coverage is provided in the range from 10 millivolts to 10 volts at frequencies up to 50 Mc.

The standard consists of a voltage-measuring thermistor bridge, a special thermistor mount, instantaneous and simultaneous r-f/d-c switching arrangement, a d-c voltage source stability of the order of 1 part in 107 per minute, and d-c measuring circuitry with a sensitivity of 1 part in 107 (measurement accuracy of 1 part in 105 to 1%).

The equipment is shown in an experimental arrangement, with the thermistor mount and coaxial switch at left.

 

Original Caption by Science Service
© National Bureau of Standards



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