The manual for the Wavetek Model 148A 20 MHz AM/FM/PM Generator provides detailed instructions on setting up and operating the device, including waveform selection, modulation modes, and frequency control, either manually or via external voltages. It also covers troubleshooting aspects such as adjusting waveform symmetry, start/stop points, and handling external modulation inputs, ensuring users can effectively manage the generator's functions and outputs.
Manual Overview
The Wavetek Model 148A 20 MHz AM/FM/PM Generator manual provides detailed instructions for operation, troubleshooting, and maintenance. The generator is capable of producing sine, triangle, square, ramp, and pulse waveforms with adjustable symmetry, amplitude, and DC offset. It features both internal and external modulation capabilities, allowing for amplitude, frequency, and phase modulation. Troubleshooting involves checking external and internal trigger/gate settings and verifying waveform outputs. Error diagnostics are not explicitly detailed, but issues can often be traced to incorrect modulation settings or improper external signal inputs. Calibration and adjustments are made via the front panel controls, which allow for manual frequency and amplitude adjustments. The manual provides board-level guidance, emphasizing the importance of correct input impedance and sensitivity settings for external modulation inputs. The generator’s frequency range is from 0.0002 Hz to 20 MHz, with precision controlled by a vernier dial. The manual stresses the importance of maintaining proper waveform symmetry and offset to ensure accurate signal generation.
Overview
Wavetek Model 148A is a 20 MHz AM/FM/PM Generator that provides a precision source of various waveforms, including sine, triangle, square, ramp, and pulse, as well as DC voltage. The generator allows control over waveform symmetry, amplitude, and DC offset. It features a built-in modulation generator for modulating frequency, phase, and amplitude, and can be operated in continuous, triggered, or gated modes. The device supports both internal and external modulation, with adjustable start/stop points and attenuation options for waveform outputs. The frequency can be manually or electrically controlled, and the device includes a TTL sync pulse output.
Specifications
- Waveforms: Selectable sine, triangle, square, positive square, negative square, and dc. TTL sync pulse provided. Variable symmetry, amplitude, and dc offset.
- Operational Modes: Continuous, External Trigger, External Gate, Internal Trigger, Internal Gate.
- Modulation Modes: Internal Modulation, External Modulation.
- Frequency Range: 0.0002 Hz to 20 MHz in 10 overlapping ranges.
- Function Output: Selectable and variable to 30V p-p. All waveforms and dc can supply 150 mA peak current. Attenuated to 60 dB in 20 dB steps.
- Adjustable Waveform Start/Stop Point: Approximately -90° to +90° to 2 MHz.
- DC Output and DC Offset: Selectable through function output. Controlled by front panel controls.
- External Modulation Input: AM, FM, PM with specified sensitivities and input impedances.
- Symmetry: Continuously adjustable from 1:19 to 19:1.
- Sync Output (TTL): TTL level pulse. Frequency and time symmetry same as function output.
- Trigger and Gate: Input Range: 1V p-p to ±10V. Input Impedance: 10 kΩ, 33 pF. Pulse Width: 25 ns minimum. Repetition Rate: 10 MHz maximum.
- Frequency Precision: Dial Accuracy specified for different ranges.
- Output: Fixed level outputs specified for different waveforms.
- Frequency Modulation (FM IN): Voltage control of modulator frequency with specified sensitivity and input impedance.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
The Wavetek Model 148A is a 20 MHz AM/FM/PM generator that produces various waveforms such as sine, triangle, square, ramp, and pulse, along with DC voltage. It can modulate frequency, phase, and amplitude using either an internal or external source. The generator operates in continuous mode, triggered mode for a single pulse, or gated mode for a burst of pulses. Triggering and gating can be controlled internally or externally, with selectable start/stop points. The output waveforms can be attenuated and offset, and a TTL sync pulse is available. Frequency control is manual or via external voltages. The generator supports internal and external modulation modes, including amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM), with specific sensitivities and input impedance for each mode. The frequency range is from 0.0002 Hz to 20 MHz, with adjustable waveform symmetry and start/stop points.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 488.9 KB)
Wavetek 148A 20MHz Generator Manual: Provides instructions for operation, calibration, and troubleshooting of AM/FM/PM functions.
- Brand: Wavetek-model-148a-20mhz-am-fm-pm-generator-instruction
- Model: MANUAL
- Type: Manual
- File size: 488.9 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Wavetek Model 148A 20MHz AM/FM/PM Generator Overview
The Wavetek Model 148A is a versatile 20MHz signal generator designed for amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM) applications. This precision instrument is widely used in electronics testing, calibration, and communications research to generate stable and accurate modulated signals across a broad frequency range. Its robust design and reliable performance make it ideal for laboratory and field use.
Main Features and Specifications
- Frequency range: DC to 20 MHz
- Modulation types: AM, FM, and PM
- High stability frequency output with low distortion
- Adjustable modulation depth and deviation
- Output amplitude control with calibrated attenuator
- Internal modulation oscillator with variable frequency
- External modulation input capability
- Clear analog display and intuitive control layout
Basic Usage and Operation Tips
Before operating the Wavetek 148A, ensure the device is properly connected to a stable power source. Start by selecting the desired modulation type (AM, FM, or PM) using the front panel controls. Adjust the carrier frequency within the 20MHz range, then set the modulation parameters such as depth or deviation to match your testing requirements. Use the output amplitude control to fine-tune the signal level. For best results, allow the instrument to warm up for a few minutes to stabilize frequency output. When using external modulation, verify input signal levels to avoid distortion.
Troubleshooting and Maintenance
If the output signal is unstable or distorted, check all cable connections and ensure the device is grounded properly. Verify that the modulation source is functioning correctly and within specified input limits. Regularly clean the front panel and connectors to prevent dust accumulation. For internal maintenance or calibration, refer to the official service manual and consult qualified technicians. Avoid exposing the instrument to extreme temperatures or humidity to prolong its lifespan.
Safety Reminder
Always operate the Wavetek Model 148A in a dry environment and avoid contact with exposed electrical components. Disconnect the device from power before performing any maintenance. Use proper grounding techniques to prevent electric shock and equipment damage. Follow all local electrical safety regulations when using this equipment.