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General| Brand | Tektronix |
|---|---|
| Model | 491 |
| Category | Measuring Instruments |
| Language | English |
Details the electrical specifications of the spectrum analyzer, including frequency range, sensitivity, and accuracy parameters.
Details the function of front panel controls and connectors, categorized by system (CRT, Time Base, Trigger, IF).
Guides new users through initial setup and basic control familiarization for the Type 491.
Explains how to apply RF signals and details the selection of appropriate mixers and adapters for different frequency bands.
Details procedures for calibrating dispersion, IF center frequency, and balancing dispersion controls.
Describes how to achieve phase lock with internal or external reference frequencies for improved stability.
Describes the phase lock circuit's role in synchronizing the local oscillator with a reference frequency.
Covers general cleaning, lubrication, and inspection for instrument upkeep.
Explains component replacement, circuit board replacement, and general repair techniques.
Details procedures for removing and replacing assemblies like circuit boards and high voltage compartments.
Offers guidance on isolating and resolving instrument malfunctions through systematic checks.
Lists essential test equipment and specifications required for performance verification.
Details step-by-step procedures for checking instrument performance and control functions.
Covers checks for trace alignment, astigmatism, scale illumination, position controls, and sweep length.
Covers checks for internal triggering, IF center frequency, and dispersion accuracy.
Details checks for resolution bandwidth, IF GAIN control range, and IF attenuator accuracy.
Details checks for display flatness, RF center frequency calibration, sensitivity, and phase lock operation.
Covers checks for spurious signals from internal sources and dial accuracy.
Provides procedures for calibrating the RF section, including dial tracking and oscillator calibration.
Lists essential test equipment and specifications required for instrument calibration.
Provides a detailed sequence of steps for performing instrument calibration.
Guides calibration of the -10V, +10V, +150V, and high voltage power supplies.
Details calibration of intensity range and checks for power supply voltage regulation and ripple.
Covers calibration of trace alignment and vertical amplifier gain.
Guides calibration of trigger level centering, external/line triggering, and sweep circuits.
Details calibration of the IF amplifier response and resolution bandwidth.
Covers calibration of kHz/DIV dispersion and phase lock operation.
Provides detailed procedures for calibrating RF section components like oscillators and mixers.
