AUTOMATIC MUTUAL INDUCTANCE BRIDGE FOR ACCURATE ALTERNATING CURRENT SUSCEPTIBILITY MEASUREMENTS FROM 1.2 TO 300 K.

THE AUTHORS DESCRIBE A COMPLETELY COMPUTER-DRIVEN SENSITIVE ALTERNATING CURRENT SUSCEPTOMETER FOR EXPERIMENTS AT FREQUENCIES BETWEEN 10 HERTZ AND 5 KILOHERTZ IN THE TEMPERATURE RANGE FROM 1.2 TO 300 K AND IN MAGNETIC FIELDS F 6 T. THE SUSCEPTIBILITY IS MEASURED BY MOVING THE SAMPLE BETWEEN THE SECONDARY COILS, WHICH FORM PART OF A MUTUAL INDUCTANCE BRIDGE CONTROLLED BY A PERSONAL COMPUTER. THE TEMPERATURE IS REGULATED BY A NEWLY DEVELOPED CLAMPED PI ALGORITHM. THE CALIBRATION PROCEDURE IS DESCRIBED AS WELL AS THE EXPERIMENTAL CONTROL PROGRAM. ABSOLUTE VALUES OF THE SUSCEPTIBILITY ARE MEASURED WITH AN ACCURACY OF 2%.