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首页> 外文期刊>Review of Scientific Instruments >A FIELD INTENSITY METER
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A FIELD INTENSITY METER

机译：磁场强度计

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摘要

The fundamentals of field intensity measurements are summarized. The general methods of using a receiving set and a source of voltage for calibrating are outlined. The methods are then extended in application to a radio receiver which utilizes a modified superheterodyne circuit. The resultant beat note is of low frequency, and may be greatly amplified by means of audiofrequency stages of amplification. This gives the receiver not only extreme sensitivity but also great selectivity. In other methods of measurement, the apparent field strength depends on the amount of modulation of the incoming wave. In the method here described, the beat note with the carrier wave is so great, compared to any contribution of the side‐bands, that the meter readings do not change by any noticeable amount when a transmitting station ceases to modulate and transmits only the carrier wave. The beat note with the carrier wave is so great that it is possible to make measurements on stations whose fields are so weak that they cannot be detected on an ordinary receiver. The attenuator is of the capacity type with a range of voltage from less than 1 microvolt to 3×106 microvolts. Detailed descriptions of the receiver and attenuator are given, as well as the methods of calibrating the apparatus.
机译：总结了场强测量的基本原理。概述了使用接收装置和电压源进行校准的一般方法。该方法然后在应用中扩展到利用改进的超外差电路的无线电接收机。所产生的节拍音符具有低频，并且可以通过音频的放大级大大放大。这不仅使接收器具有极高的灵敏度，而且具有很高的选择性。在其他测量方法中，视场强度取决于入射波的调制量。在这里描述的方法中，与边带的任何贡献相比，带有载波的拍子音非常大，以至于当发送站停止调制而仅发送载波时，仪表读数不会有任何明显的变化波。带有载波的节拍音非常大，可以在场弱到无法在普通接收器上检测到的电台上进行测量。衰减器是容量类型，其电压范围从小于1微伏到3×106微伏。给出了接收器和衰减器的详细说明，以及校准设备的方法。

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