Goniometers

The ER 218PG1 Programmable Goniometer has been designed to simplify and speed-up the previously tedious task of measuring EPR spectra of single crystals as a function of their angular position in the magnetic field. The goniometer uses a computer controlled stepper motor to position the sample with an angular resolution of 0.125 degree and a reproducibility of 0.5 degrees, independent of the direction of rotation. The sample tube or quartz rod is inserted and locked in a special keyed holder which then fits onto the goniometer in a reproducible position. To ensure that the crystal does not wobble excessively during rotation, the sample tube is supported at two positions in the holder. The ER 218PG1 is compatible with the temperature controller systems ER 4112HV and ER 4131VT.