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to interaction of the line with the EM field being measured.

It is planned to make further performance tests at NBS of the EFM-5 instrument, for example to determine the magnitude of the CMRR at several frequencies and to measure the effects of ambient temperature, especially over the range of 15° to 25°C. The latter tests will be made at various frequencies and probe orientations with respect to the E field. Another planned test is to determine the amount of case leakage vs signal level and frequency. These tests will include the effect of ambient temperature on the sensitivity of the detector diodes in the probe and on the varistor shaping curve. However, sufficient field tests have already been made to ensure adequate performance of the radiation monitor.

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Figure 24.

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Photograph of the preamplifier board showing the zeroing controls and test points.

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