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Introduction to the NHMFL Pulsed Field Facility at LANL

Information on the physical set-up of pulsed field measurements

Read about lock-in amplifiers and their role in your measurements

Information about noise and ways to eliminate it from your measurements

How to collect and evaluate your measurement data

Information on optical spectroscopy

Information about time-resolved optics

Information on de Haas van Alphen Effect measurements

Information on Shubinkov de Haas Effect measurements

Information on Absolute Resistivity measurements

Information on Heat Capacity measurements

Information on RF Penetration Depth measurements

Time Constant and Filtering


FILTERING AND TIME CONSTANTS:

The time constants should be set to as small a valve as possible consistent with required SIN.

The filter settings on preamplifiers have no effect on final noise levels. These are determined only by the lock-in time constant and associated noise bandwidth. Therefore, preamplifier filters must be set to stop only unwanted signals outside the lock-in bandwidth. This can help prevent overloading of the lock-in.