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FAQs
What is the “waveform refresh rate” of an oscilloscope?
Waveform capture rate indicates how many times per second the oscilloscope can capture and display waveforms. Think of an oscilloscope as a video camera that takes snapshots of waveforms. Waveforms are continuous and constantly evolving, whereas a camera captures only discrete images—snapshots taken at specific moments. Even if the instrument can capture one million samples per second, there will still be gaps between successive captures, causing some waveform details to be missed. To observe waveforms that more closely resemble their true shape, we need to increase the number of captures within each second, thereby improving the chances of detecting rare signals with extremely low probabilities.
Can a differential probe be used with other oscilloscopes, and how do you use it?
The BNC universal connector is compatible with other oscilloscopes; just ensure the probe supports 50 Ω impedance, as some oscilloscopes only accommodate 1 MΩ. For models with a bandwidth of 300–500 MHz, 50 Ω impedance is required.
Why can’t I install apps from the Google Play Store or apps I’ve developed myself?
To prevent unauthorized third-party apps from interfering with the oscilloscope’s functionality, only official apps from the Appmarket can currently be installed.
How can I save common oscilloscope settings for reuse?
Pull the oscilloscope down from the top, locate the “Save” setting, and click Save according to your preferred naming convention to store the current configuration. To recall it next time, simply go back to this screen and select “Restore.”
Why does touchscreen interference occur?
Touchscreen interference is inherent to capacitive screens and currently has no industry‑wide solution. The only alternative is resistive touchscreens, but they are far less practical. When interference occurs, users are left with the workaround of connecting a mouse—though, for now, this approach is adopted by only a small minority. Such interference is commonly observed in inverters and variable‑frequency drives.
What is the difference between the frequency counter on an oscilloscope and the frequency measurement function?
The frequency counter is implemented in hardware and provides up to six-digit accuracy; the frequency measurement in the measurement menu is based on the signal displayed on the oscilloscope screen and is accurate to only four digits.
What is the maximum number of data points that the oscilloscope’s FFT function can handle?
Currently, the Fourier‑transform FFT can handle up to 100,000 data points. In electronic measurements, the FFT is useful for identifying noise sources, characterizing the impulse response of filters and systems, performing jitter analysis, analyzing harmonic power, conducting electromagnetic interference (EMI) analysis, and carrying out frequency‑response analysis, among other applications.
What is the purpose of the oscilloscope’s persistence feature?
Afterglow refers to the trace left on the screen by a waveform. You can set the afterglow duration anywhere from 100 milliseconds to 10 seconds, or enable infinite afterglow, which ensures that any point where the waveform has appeared on the screen remains visible. Using infinite afterglow allows you to measure noise and jitter, examine the worst-case scenarios of changing waveforms, detect timing violations, or capture rare events.
