A precision phase angle meter in 50Hz or 60Hz version, the 597C has been in production for well over 10 years. It has inputs for voltage, direct current or current via a clipon CT.

The phase angle can be measured to 0.1deg accuracy over a wide range of voltage from 10V to 500V, and from 50mA to 50A using the direct current input.

The clipon CT option gives current measurement up to 500A with slightly less accuracy.

We have sold many of these simple, accurate and robust instruments to utilities, industry and educational institutions.

They are used for many purposes, from student instruction in the electrical laboratory to quality control in appliance testing.

The 632A has 50V, 160V and 500V voltage ranges and the current inputs are 1A, 3.2A and 10A.

Accuracy of power measurement is typically 0.5% and accuracy of phase angle is 0.5º.

This complements the Model 632A, since the Model 633 reads phase angle, true rms voltage and true rms current in a circuit. This instrument is designed to demonstrate the properties of phasors and real/imaginary number notation for electrical engineering students. This instrument gives the phase displacement and magnitude of the parameter under investigation. The unit has filters to eliminate harmonic distortion affecting phase angle measurement.

The instrument has 500V and 50V voltage ranges and 10A and 1A current ranges plus a 500V range reference voltage input. Phase angle accuracy is typically 0.5º and voltage /current accuracy is 0.3% at 50 Hz, 20% distortion.

The Model 4014 integrates four ammeters for the direct and simultaneous reading of CT secondaries up to 10A during the setting up or checking of protection systems while they are in service with normal 50/60Hz primary currents flowing. The two terminals of each channel of the Model 4014 are connected in series with the CT secondary with all other equipment in the loop or directly across the CT secondary. The unit is Ni-Cad battery powered with an internal charger.