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1.1 INTRODUCTION ... 1-1 1.1.1 List of Abbreviations ... 1-1 1.2 OPTIONS ... 1-1 1.3 SPECIFICATIONS ... 1-1 1.3.1 Waveforms (functions) ... 1-1 1.3.2 Operational Modes ... 1-1 1.3.3 Waveform Quality ... 1-2 1.3.4 Frequency ... 1-2 1.3.5 Amplitude ... 1-2 1.3.6 Offset ... 1-2 1.3.7 Outputs ... 1-2 1.3.8 Inputs ... 1-3 1.3.9 Displays ... 1-3 1.3.10 GPIB Programming ... 1-3 1.3.11 General ... 1-3 1.4 EQUIPMENT SUPPLIED ... 1-3 1.5 EQUIPMENT REQUIRED BUT NOT SUPPLIED ... 1-3 SECTION 2 PREPARATIONS 2.1 RECEIVING AND INSPECTING SHIPMENTS ... 2-1 2.2 RETURNING EQUIPMENT FOR REPAIR ... 2-1 2.3 INITIAL CHECKOUT ... 2-1 2.3.1 Introduction ... 2-1 2.3.2 Preparation for Use ... 2-1 2.3.3 Turn-on and Initial Checkout Procedure ... 2-2 2.3.4 Maintenance Messages and Errors ... 2-3 2.3.5 Performance Verification ... 2-3 2.4 PREVENTIVE MAINTENANCE ... 2-6 2.4.1 General ... 2-6 2.4.2 PM Procedures ... '.r ... 2-6 SECTION 3 OPERATION 3.1 USE AND FUNCTION OF EACH CONTROL ... 3-1 3.1.1 Front Panel Controls, Indicators, and Connectors ... 3-1 3.1.2 Rear Panel Controls, Indicators, and Connectors ... 3-11 3.2..NORMAL OPERATION ... 3-12 3.2.1 Start-Up ... 3-12 3.2.2 Continuous Wave (CW) ... 3-12 3.2.3 Sweep Modulation ... 3-13 3.2.4 Amplitude Modulation (AM) ... 3-14 3.2.5 Frequency Modulation (FM) ... 3-15 3.2.6 Voltage Controlled Frequency (VCF) ... 3-17 3.2.7 GPIB (Remote) Operation ... 3-19 3.3 GPIB COMMAND STRUCTURE ... 3-20 3.3.1 Introduction ... 3-20 3.3.2 Model 288 Commands ... 3-20 3.3.2.1 Command Types ... 3-21 3.3.2.2 288 Command Syntax ... 3-22 3.3.2..3 288 Command List ... 3-23 3.3.3 Universal and Addressed Commands ... 3-26 3.3.4 Detailed Command Descriptions ... 3-26 3.3.5 Service Requests ... 3-28 3.3.6 Displaying Messages ... 3-29 3.3.7 GPIB Keys ... 3-30 SECTION 4 CIRCUIT DESCRIPTION 4.1 THE MODEL 288 ... 4-1 4.2 DETAILED CIRCUIT DESCRIPTION ... 4-2 4.2.1 Motherboard Assembly ... 4-2 4.2.1.1 Microprocessor Circuit ... 4-2 4.2.1.2 GPIB Interface Circuit ... 4-2 4.2.1.3 Frequency Synthesizer Circuit ... ■ 4-3 4.2.1.4 Internal Calibration Network Circuit ... 4-3 4.2.1.5 DAC/Sample and Hold Network Circuit ... 4-3 4.2.1.6 Secondary Input/Output Network Circuit ... 4-3 4.2.1.7 Relay Driver Network Circuit ... 4-4 4.2.1.8 Balanced Output Attenuator Network and Impedance Control Circuit ... 4-4 4.2.1.9 Unbalanced Output Attenuator Network and Impedance Control Circuit ... 4-4 4.2.1.10 Power Supplies Circuit ... 4-4 4.2.2 Front Panel ... 4-4 4.2.2.1 Control Knob ... 4-4 4.2.2.2 Display ... 4-4 4.2.2.3 Keyboard Circuit ... 4-5 4.2.2.4 LED Circuit ... 4-5 4.2.3 Function Generator ... 4-5 4.2.3.1 VCG Summing Amplifier ... 4-5 4.2.3.2 Sweep Generator ... 4-5 . 4.2.3.3 Symmetry Control ... 4-6 4.2.3.4 VCG Current Sources ... 4-6 4.2.3.5 High Frequency Compensation ... 4-6 4.2.3.6 Comparator ... 4-6 4.2.3.7 Frequency Range Switches ... 4-7 4.2.3.8 Capacitance Multiplier ... 4-7 4.2.3.9 Triangle Buffer ... 4-7 4.2.3.10 Auto Calibration ... 4-7 4.2.4 Phase Lock Loop Assembly ... 4-7 4.2.4.1 Phase Lock Loop ... 4-7 4.2.4.2 Sine Convertor ... 4-8 4.2.4.3 Amplitude Modulator ... 4-9 4.2.5 Output Assembly ... 4-9 4.2.5.1 Function Selector ... 4-9 4.2.5.2 Preamplifier ... 4-9 4.2.5.3 R-R2 Ladder ... 4-9 4.2.5.4 Power Amplifier ... 4-9 4.2.5.5 -20dB Attenuator ... 4-10 4.2.5.6 Unbalanced and Balanced Drivers ... 4-10 4.2.5.6 Peak Detector ... 4-10 4.2.6..Rear Panel ... 4-10 SECTION 5 CALIBRATION PROCEDURE 5.1 CALIBRATION ... 5-1 5.1.1 Auto Cal ... 5-1 5.1.2 Calibrate ... 5-1 5.2.AUTO CAL PROCEDURE ... 5-1 5.3 CALIBRATE PROCEDURE ... 5-1 SECTION 6 TROUBLESHOOTING 6.1 INTRODUCTION ... 6-1 6.2 FACTORY REPAIR ... 6-1 6.3 BEFORE STARTING ... 6-1 6.3.1 Inspection ... 6-1 6.4 TROUBLESHOOTING ... 6-1 SECTION 7 PARTS LISTS AND SCHEMATICS 7.1..DRAWINGS ... 7-1 7.1.1 Assembly Drawings ... 7-1 7.1.2 Schematics ... 7-1 ?.1.3 Parts Lists ... 7-1 7.2..ADDENDA ... 7-1 7.3 ORDERING PARTS ... 7-1 APPENDIX A. PERFORMANCE VERIFICATION FORM ... A-1