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Lake Shore Model 480 Fluxmeter User’s Manual
Table of Contents i
Table of Contents
Chapter/Paragraph Title Page
1 INTRODUCTION .................................................................................................................................... 1-1
1.0 GENERAL ........................................................................................................................... 1-1
1.1 PRODUCT DESCRIPTION ................................................................................................. 1-1
1.2 SPECIFICATIONS .............................................................................................................. 1-2
1.3 SAFETY SUMMARY ........................................................................................................... 1-4
1.4 SAFETY SYMBOLS ............................................................................................................ 1-4
2 MAGNETIC MEASUREMENT OVERVIEW ........................................................................................... 2-1
2.0 GENERAL ........................................................................................................................... 2-1
2.1 INTEGRATING INSTRUMENTS ........................................................................................ 2-1
2.1.1 What Is An Integrator? ..................................................................................................... 2-1
2.1.2 Why Integrators Are Used For Magnetic Measurement .................................................. 2-1
2.1.3 Important Integrator Characteristics ................................................................................ 2-2
2.1.4 Reducing Integrator Drift .................................................................................................. 2-3
2.1.5 Dielectric Absorption ........................................................................................................ 2-3
2.1.6 Analog Versus Digital Integrators .................................................................................... 2-4
2.1.7 Fluxmeter Measurements in Magnetizers ....................................................................... 2-4
2.1.8 Making AC Measurements .............................................................................................. 2-6
2.2 COIL CHARACTERISTICS ................................................................................................. 2-6
2.2.1 Coil Sensitivity.................................................................................................................. 2-6
2.2.2 Coil Size ........................................................................................................................... 2-7
2.2.3 Coil Resistance ................................................................................................................ 2-7
2.2.4 Coil Temperature Coefficient ........................................................................................... 2-8
2.2.5 Coil Orientation ................................................................................................................ 2-8
2.2.6 Field Uniformity ................................................................................................................ 2-9
2.2.7 Lead Pickup ..................................................................................................................... 2-9
2.2.8 Inductance, Capacitance, and Self Resonance ............................................................... 2-9
2.2.9 Lake Shore Coils and Probes .......................................................................................... 2-9
2.3 FLUX OVERVIEW ............................................................................................................. 2-10
2.4 FLUX DENSITY OVERVIEW ............................................................................................ 2-10
2.4.1 What is Flux Density? .................................................................................................... 2-10
2.4.2 How Flux Density (B) Differs from Magnetic Field Strength (H) .................................... 2-11
2.5 MAGNETIC MOMENT OVERVIEW .................................................................................. 2-11
2.5.1 What is Magnetic Moment? ........................................................................................... 2-11
2.5.2 Important Parameters of a Hemholtz Coil ..................................................................... 2-11
2.5.3 Hemholtz Coil Constant Determination (For Non-Lake Shore Coils) ............................ 2-12
2.6 MAGNETIC POTENTIAL OVERVIEW .............................................................................. 2-13
2.6.1 What is Magnetic Potential? .......................................................................................... 2-13
2.6.2 Important Parameters of a Potential Coil ....................................................................... 2-13
3 SETUP .................................................................................................................................................... 3-1
3.0 GENERAL ........................................................................................................................... 3-1
3.1 RECEIVING THE MODEL 480 ........................................................................................... 3-1
3.1.1 Inspection and Unpacking ............................................................................................... 3-1
3.1.2 Repackaging For Shipment ............................................................................................. 3-1
3.2 REAR PANEL DEFINITION ................................................................................................ 3-2
3.3 LINE INPUT ASSEMBLY .................................................................................................... 3-2
3.3.1 Line Voltage and Fuse Verification .................................................................................. 3-2