Wavetek 148A Generator
Manufacturer:
Model:
148A
Date:
1981
Category:
Group:
Description:
AM/FM/PM Generator

Information

THE MODEL 148A Wavetek Model 148A 20 MHz AM/FM/PM Generator is a precision source of sine, triangle, square, ramp and pulse waveforms plus dc voltage. The waveforms may be controlled in symmetry as well as amplitude and dc offset. A built-in modulation Generator can modulate frequency, phase and amplitude or modulation may be by an external source. The Generator may be run in continuous mode or triggered for a single pulse or gated for a burst of pulses. Triggering and gating may be by the model 148 built-in modulation Generator or by an external source. The triggered and gated waveform start/stop point is selectable from -90° through +90°, Start/stop control plus dc offset control gives haverwave capability. The main output of waveforms may be attenuated and offset. A TTL sync pulse is available at main Generator frequencies, and the modulation Generator waveforms are available at fixed amplitudes. Frequency of both the main Generator and the modulation Generator can be manually controlled at the front panel or electrically controlled by external voltages. An external sync input (Option 001) located on the rear panel allows the instrument to be synchronized to an external signal source.

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User Manual
Manual type:
User Manual
Pages:
21
Size:
562.62 Kbytes (576123 Bytes)
Language:
english
Revision:
6/81
Manual ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
22 February 2008
MD5:
2798f7f9a33b7e5471c80523522ada5e
Downloads:
1319
Service and User Manual
Manual type:
Service and User Manual
Pages:
68
Size:
3.64 Mbytes (3813936 Bytes)
Language:
english
Revision:
Manual ID:
Date:
01 August 1982
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
12 August 2018
MD5:
44c7783805b52d1992f890c1891b4a44
Downloads:
472

Information

SECTION 1 GENERAL DESCRIPTION Page 1.1 THE MODEL 148A ... 1-1 1.2 SPECIFICATIONS ... 1-1 1.2.1 Main Generator. ... 1-1 1.2.1.1 Waveforms ... 1-1 1.2.1.2 Operational Modes ... 1-1 1.2.1.3 Modulation Modes ... 1-1 1.2.1.4 Frequency Range ... 1-2 1.2.1.5 Function Output (5QQ) ... 1-2 1.2.1.6 Adjustable Waveform Start/Stop Point ... 1-2 1.2.1.7 DC Output and DC Offset . ... 1-2 1.2.1.8 External Modulation Input ... 1-2 1.2.1.9 Symmetry ... 1-2 1.2.1.10 Sync Output (TTL) ... 1-2 1.2.1.11 Trigger and Gate ... 1-2 1.2.1.12 Frequency Precision ... 1-3 1.2.1.13 Amplitude Precision ... 1-3 1.2.1.14 Waveform Characteristics ... 1-3 1.2.1.15 External Sync Input ... 1-3 1.2.3 Modulation Generator ... 1-3 1.2.2.1 Waveforms ... 1-3 1.2.2.2 Frequency Range ... 1-3 1.2.2.3 Output (60012) ... 1-3 1.2.2.4 Frequency Modulation (FM IN) ... 1-3 1.2.2.5 Waveform Characteristics ... 1-3 1.2.4 General ... 1-3 1.2.3.1 Stability (for amplitude, dc offset and frequency) ... 1-3 1.2.3.2 Environmental ... 1-3 1.2.3.3 Dimensions ... 1-3 1.2.3.4 Weight ... 1-3 1.2.3.5 Power ... 1-3 1.3 ITEMS FURNISHED ... 1-4 1.4 ITEMS REQUIRED ... 1-4 1.5 TOOLS AND TEST EQUIPMENT ... 1-3 SECTION 2 INITIAL PREPARATION 2.1 MECHANICAL INSTALLATION ... 2-1 2.2 ELECTRICAL INSTALLATION ... 2-1 2.2.1 Power Connection ... 2-1 2.2.2 Signal Connections ... 2-1 2.3 ELECTRICAL ACCEPTANCE CHECKOUT ... 2-1 2.4 PREP FOR RESHIPMENT ... 2-7 2-5 PREP FOR STORAGE ... 2-7 SECTION 3 OPERATION 3.1 CONTROLS AND CONNECTORS ... 3-1 3.1.1 Main Generator ... 3-1 3.1.2 Modulation Generator ... 3-3 3.1.3 Rear Panel Connector ... 3-3 3.2 OPERATION ... 3-3 3.2.1 Continuous Operation ... 3-3 3.2.2 Triggered Operation ... 3-3 3.2.3 Gated Operation ... 3-4 3.2.4 Manual Triggering and Gating ... 3-4 3.2.5 AM Operation ... 3-4 3.2.6 FM Operation ... ... 3-4 3.2.7 Sweep Operation ... r ... 3-5 3.2.8 PM Operation ... 3-5 SECTION 4 CIRCUIT DESCRIPTION 4.1 FUNCTIONAL BLOCK DIAGRAM ANALYSIS ... 4-1 4.2 CIRCUIT ANALYSIS ... 4-3 4.2.1 VCG Amplifier ... 4-3 4.2.2 Symmetry Control ... 4-3 4.2.3 Range Switching ... 4-3 4.2.4 Capacitance Multiplier ... 4-5 4.2.5 Triangle Amplifier ... 4-5 4.2.6 Hysteresis Switch ... 4-5 4.2.7 Diode Gate and Timing Capacitor ... 4-5 4.2.8 Triangle Buffer ... 4-6 4.2.9 Signal Shaper ... 4-6 4.2.10 Transconductance Multiplier ... 4-6 4.2.11 Preamplifier ... 4-6 4.2.12 Output Amplifier ... 4-6 4.2.13 Sync Amplifier/Square Amplifier ... 4-8 4.2.14 Trigger Signal Limiter ... 4-8 4.2.15 Trigger Logic/Trigger Amplifier ... 4-8 4.2.16 Baseline Compensation ... 4-9 4.2.17 Modulation Generator and Ramp Generator ... 4-9 SECTION 5 CALIBRATION 5.1 FACTORY REPAIR ... 5-1 5.2 REQUIRED TEST EQUIPMENT ... 5-1 5.3 REMOVING Generator COVERS ... 5-1 5.4 CALIBRATION ... 5-1 SECTION 6 MAINTENANCE 6.1 ROUTINE MAINTENANCE ... 6-1 6.1.1 Cleaning ... 6-1 6.1.2 Inspection ... 6-1 6.2 REPAIR ... 6-1 6.2.1 Repair and Replacement ... 6-1 6.2.2 Factory Repair ... 6-1 6.2.3 Disassembly ... 6-1 6.2.4 Reassembly ... 6-1 6.3 TROUBLESHOOTING ... 6-2 6.4 TROUBLESHOOTING INDIVIDUAL COMPONENTS ... 6-2 6.4.1 Transistor ... 6-2 6.4.2 Diode ... 6-2 6.4.3 Operational Amplifier ... 6-2 6.4.4 FET Transistor ... 6-2 6.4.5 Capacitor ... 6-2 SECTION 7 PARTS AND SCHEMATICS 7.1 DRAWINGS ... 7-1 7.2 ORDERING PARTS ... 7-1 7.3 ADDENDA ... 7-1

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