Choosing an oscilloscope for signal testing requires understanding bandwidth, sampling rate, memory depth, channel requirements, and measurement features. Agilent oscilloscopes, now associated with Keysight Technologies, are available across different performance categories for electronics development, education, troubleshooting, and laboratory testing. The appropriate instrument depends on the type of signals being measured, their frequency range.
Selecting an oscilloscope for signal testing involves matching the instrument's specifications with the characteristics of the signals being measured. Agilent Technologies' electronic test and measurement business became part of Keysight Technologies, so many instruments historically associated with Agilent are now available under the Keysight brand. The selection process should focus on measurement requirements rather than brand name alone.
An oscilloscope displays electrical signals as waveforms and helps users examine characteristics such as voltage, frequency, timing, and noise. The most important specifications depend on the signals and measurements involved.
Important specifications to consider include:
Bandwidth: Determines the highest frequency components the oscilloscope can accurately capture. Higher-frequency signals generally require greater bandwidth.
Sample rate: Indicates how frequently the oscilloscope samples an input signal. A sufficiently high sample rate helps represent rapidly changing waveforms accurately.
Memory depth: Determines how much waveform data can be stored during an acquisition. Deeper memory can be useful when analyzing long events or detailed signal behavior.
Number of channels: Two-channel models may suit basic measurements, while four or more channels can be useful for examining relationships among multiple signals.
Vertical resolution: Affects the instrument's ability to distinguish small voltage changes. Higher resolution can be useful for low-level signal measurements.
Triggering: Advanced triggering functions help isolate specific waveform events, making it easier to analyze intermittent or complex signal behavior.
The appropriate combination of these specifications depends on whether the oscilloscope will be used for digital electronics, analog circuits, power electronics, communications, embedded systems, or general troubleshooting.
Beyond basic specifications, additional features can influence how efficiently measurements can be performed. Users should consider the types of analysis required and how the oscilloscope will fit into their existing test setup.
Useful considerations include:
Probe compatibility: Probes should be appropriate for the voltage, frequency, and physical characteristics of the circuit being tested.
Automatic measurements: Functions for frequency, amplitude, rise time, duty cycle, and other parameters can simplify repetitive measurements.
Waveform mathematics: Mathematical operations can help compare, combine, or transform acquired signals.
Protocol analysis: Certain models provide tools for examining communication buses and digital signals.
Connectivity: USB, LAN, and other interfaces may support data transfer, remote operation, or integration with laboratory systems.
Display and usability: A clear display and intuitive controls can make waveform interpretation and troubleshooting easier.
When comparing models, users should also consider the testing environment. Laboratory research may require advanced analysis and high performance, while classroom work or basic maintenance may require fewer specialized functions. Safety ratings and appropriate measurement practices are particularly important when working with high-voltage or power circuits.
choosing an Agilent oscilloscope for signal testing requires careful consideration of bandwidth, sample rate, memory depth, channel count, resolution, triggering, probes, and analysis capabilities. Since Agilent's electronic test and measurement business is now part of Keysight Technologies, users may encounter both historical Agilent references and current Keysight product information. The most suitable oscilloscope is determined by the signals being measured and the accuracy, analysis, and connectivity requirements of the specific testing application.