Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley Appnotes 2565 Noise in Lo Res

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                                         A    G R E AT E R       M E A S U R E       O F   C O N F I D E N C E




Problem: Noisy
Readings in
Low Resistance
Measurements
Probable Cause:                                                Changing magnetic fields can come from            B. Consider using shielded twisted pair
Magnetic Interference                                       local AC currents in the test system or from            cables. At the very least, run leads close
    The most common cause of noisy low                      the deliberate ramping of the magnetic field,           together.
resistance measurement is magnetic interfer-                such as for magnetoresistance measurements.          C. Tie down the cables to minimize move-
ence.                                                       Relative motion can come from something                 ment.
    Low resistance measurements are, in                     that seems as harmless as dangling leads,            D. If necessary, shield the test setup with Mu
general, low voltage measurements, and are                  which can generate nanovolts as they move in            metal, a special alloy with high perme-
susceptible to the low voltages generated by                the earth's magnetic field. To avoid this in ex-        ability at low magnetic flux densities.
magnetic interference. Faraday's law states                 tremely sensitive voltage measurements, the          E. Filter out AC signals from magnetic fields
that a voltage will be induced in any conduc-               leads must be kept short and rigidly secured.           at the input of the instrument.
tor exposed to a changing magnetic field.                                                                        F. Try moving the instrument farther from
This can happen in two ways:                                Remedies                                                the source of an interfering magnetic
1. The field changes with time.                             A. Use twisted pair cables, which reduce the            field.
2. There is relative motion between the cir-                   enclosed area in the magnetic field and
    cuit and the field.                                        minimize the induced voltage.




Specifications are subject to change without notice.
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