The LP-VP-DSW window / dual slope voltage transducer converts an ac voltage input into an output signal which is proportional to the rms calibrated arithmetic mean of the input. Accurate measurement assumes a sinusoidal input waveform. To enhance the resolution of the reading the transducer can be set up to operate with a window or a dual slope. The window option suppresses the lower end of the range so that the transducer reads over a band of voltage centred on the nominal working voltage of the system being measured. The dual slope option has a lower resolution at the low end of the range with a higher resolution centred on the nominal working voltage of the system being measured.