of volt the two effects very nearly cancel each other, and the frequency error is less than 2% up to 100 megacycles. At frequencies up to about 50 megacycles the frequency error is less than d=2% for all levels.

The curves of Figure 4 also apply when the Type 726-P1 Multiplier is used, since it introduces no appreciable frequency error in the range from 1 to 100 megacycles.

When non-sinusoidal voltages are being measured at high frequencies, the peak value of the voltage acting on the diode may be markedly different from the peak value at the probe terminals, because of the different value of resonant rise experienced by the various components of the voltage. Consequently, considerable caution must be exercised in interpreting readings at the higher frequencies, if the voltage under measurement is not very nearly sinusoidal. For sinusoidal voltages, however, it is possible to make measurements at frequencies up to 150 megacycles with substantially the same accuracy that obtains at lower frequencies, by using the correction factors indicated in Figure 4.

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