SECTION 1 OPERATING INSTRUCTIONS Page Introduction 1-1 Instrument Description 1-1 Installation and Removal 1-1 Instrument Operation 1-2 Input Connections 1-2 Probe 1-2 High Impedance Input 1-2 Input Overloading 1-2 Output Connections 1-2 Step Gain DC Balance 1-2 DC Offset Coarse and Fine 1-2 HF and LF Bandwidth Reduction 1-2 Pre-Charging 1-2 Functions Available at Rear Connector 1-3 Measurement Techniques 1-3 Single-Ended vs. Differential Measurements 1-3 Common Mode Rejection Ratio 1-4 Degradation of CMRR 1-5 Specifications 1-6 SECTION 2 THEORY OF OPERATION Introduction 2-1 Input Coupling 2-1 Input Overdrive Protection 2-1 Gate Current Compensation 2-1 Preamp 2-1 SECTION 2 THEORY OF OPERATION (cont) Page DC Offset 2-1 Input Cross Neutralization 2-1 High Frequency Common-Mode Balance 2-3 Preamp Output Stage 2-3 LF -3 dB POINT Selector 2-3 Gain Switching Amplifier 2-3 HF -3 dB POINT Selector 2-3 Variable Gain Stage 2-3 Output Amplifier 2-3 Overrange Indicator 2-4 Power Supplies 2-4 SECTION 3 SERVICE INFORMATION Symbols and Reference Designators 3-1 Electrical Parts List 3-2 Internal Adjustment Procedure Parts Location Grid Front Panel Controls and Block Diagram Preamplifier Schematic Output Amplifier chematic Switch Details Schematic Power Supplies Schematic Mechanical Parts List Exploded View Accessories and Repackaging