Reference phase shifter for testing electronic phase meters type ÉF-1 (F2-1)

Conclusions

It will be seen from analyzing (2') that the above methods of testing electronic phase meters can also be applied for testing digital phase meters (from 0 to 180°) by using more precise and higher-quality capacitance standards (for instance, capacitance boxes ME-1, ME-3 [5] KVM-4S [6], etc.), and a nonreactive resistance box type R-58, whose range extends to 5000 Hz, or a box consisting of nonreactive resistors UNU [7]. In the latter case the actual values of the resistors should be used, thus extending the frequency error testing range up to radio frequencies (without taking into consideration the shunting effect of the tested phase meter's input circuit).

The reference phase shifter can be fed from Soviet-made oscillators (for instance, GZ-33, GZ-4A, etc.) by checking their frequency against a crystal oscillator type KG-A by means of an oscilloscope (for instance, ÉO-7 etc.) or a digital frequency meter (for instance, Ch3-3A, Ch3-4A, etc.).

The testing will then be correct, provided that the input impedance of the tested digital phase meters retains a value of not less than Z_in=5 MΩ.

The value of Z_in drops with frequency, and this limits the phase meter's testing range.

The electronic phase meters type ÉF-1 (F2-1) tested by this method at the plants which use them have all without exception subsequently passed their state testing at the VNIIM.