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To get a more stable, detailed oscilloscope trace, first make the waveform fill as much of the vertical display as possible without clipping. Then reduce noise with averaging, high-resolution acquisition, bandwidth limits, or better probing—choosing methods that preserve the signal details you need. These techniques improve effective measurement resolution; they do not add physical bits to the oscilloscope’s ADC.
What increasing vertical resolution can—and cannot—do
Vertical resolution describes how finely an oscilloscope digitizes voltage. Many digital scopes provide 8-bit vertical resolution in normal acquisition mode, according to Keysight’s low-current measurement application note. Acquisition processing and careful setup can make a trace appear less noisy and use the available ADC range more effectively, but they do not change the ADC’s hardware bit depth.
Extra effective resolution is not a guaranteed number. It depends on the scope’s ADC and vertical gain and offset accuracy, as well as probe noise, bandwidth, jitter, trigger stability, and signal characteristics. A smoother trace is useful only if the measurement still includes the signal’s relevant frequency content.
Start by using the vertical range well
Choose the smallest volts-per-division setting that keeps the waveform’s peaks and offsets on-screen. Leave enough headroom for expected transients, but avoid displaying a small waveform across only a fraction of the available height.
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Keysight explains that a waveform occupying half the display can reduce effective ADC use from 14 to 12 bits, while one occupying a quarter can reduce it to 10 bits. These are examples of the effect of scaling on ADC utilization—not a change in hardware bit depth or a promise that every oscilloscope will deliver those exact figures. See Keysight’s discussion of scaling and resolution.
Scaling cannot recover clipped peaks or eliminate noise already present in the oscilloscope or probe. If the trace clips, increase the range before interpreting its amplitude.
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Choose an acquisition method that fits the signal
| Technique | Best fit | Main benefit | Main trade-off |
|---|---|---|---|
| Vertical scaling | Signals that fit on-screen | Uses more ADC codes immediately | Cannot recover clipped peaks or remove hardware noise |
| Waveform averaging | Repetitive or DC signals | Reduces uncorrelated noise across acquisitions | Needs a stable, repeatable trigger and slows updates |
| HiRes/high-resolution acquisition | Oversampled signals, including many single-shot captures | Averages adjacent samples within one acquisition | Reduces bandwidth and sample-rate information |
| Bandwidth limiting or FIR filtering | Signals with known out-of-band noise | Reduces noise outside the needed frequency range | Can remove signal detail above the cutoff |
| Differential probing | Floating, noisy, or common-mode-sensitive circuits | Can reduce probing-related pickup | Requires a probe with suitable rating, bandwidth, and connection |
Waveform averaging for repeatable signals
When the signal repeats reliably, averaging successive acquisitions can reduce uncorrelated noise. Tektronix gives the ideal resolution improvement as 0.5 log2(N) bits, where N is the number of acquisitions averaged: four averages ideally add one bit, and 16 ideally add two. This is an ideal relationship, not a guaranteed increase in ADC resolution. It applies to noise reduction under suitable signal and acquisition conditions; averaging also slows updates and requires a stable, repeatable trigger. See Tektronix’s application note on measurement resolution and its averaging FAQ.
Start with a modest average count and check whether the waveform remains stable and the noise floor falls. Increase the count only while the added averaging is useful. Averaging can obscure changes that do not repeat consistently, so it is not a suitable substitute for a single-shot capture when the event itself matters.
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HiRes mode for oversampled signals
High-resolution, or HiRes, acquisition averages adjacent samples within one acquisition. It can be useful when the scope samples faster than the signal bandwidth requires, including in many single-shot measurements. Unlike averaging repeated acquisitions, it does not depend on the event recurring in the same way; it does, however, trade bandwidth for reduced noise and increased effective vertical resolution. Yokogawa describes the mode as a way to remove high-frequency noise and increase vertical resolution in its high-resolution mode FAQ.
Tektronix gives the vendor-described relationship vertical bits = 8 + 0.5 log2(D), where D is the maximum sample rate divided by the actual sample rate. It also gives an approximate filtered bandwidth of BW = 0.44 × actual sample rate. These relationships describe a particular acquisition-processing model, not universal scope performance. The actual available sample rate and mode behavior depend on the oscilloscope. See Tektronix’s application note.
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After enabling HiRes, inspect edges and narrow pulses: the filtering may smooth or remove details you intended to measure. Compare timing and amplitude readings with the original acquisition mode.
Bandwidth limits and digital filters
A bandwidth limit or digital/FIR filter can lower noise by excluding frequency content outside the measurement band. Set the cutoff above the highest signal content you need, rather than choosing a cutoff solely to make the trace look smooth. A filter cannot restore information that was never captured, and an overly low cutoff can alter edges, peaks, and other fast features.
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Compare filtered and unfiltered traces before relying on a result. Keysight discusses bandwidth limiting in its low-current measurement application note; Tektronix covers resolution techniques and their bandwidth trade-offs in its application note.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Reduce noise at the probe and circuit
The probe, surrounding environment, and oscilloscope itself can all contribute noise. Check the probe connection, ground lead, and source impedance before assuming the displayed noise is an ADC-resolution problem.
If ground-referenced probing or common-mode pickup is limiting the measurement, use a differential probe suited to the circuit. Verify its voltage rating, bandwidth, and attenuation for the measurement; an unsuitable probe can add error or fail to preserve the signal detail you need. Tektronix lists differential probing among techniques for addressing noise in its resolution application note.
A practical workflow
- Set the vertical scale: Reduce volts per division until the waveform uses as much screen height as possible without clipping. Allow headroom for offsets and expected transients.
- Decide whether the signal repeats: For a stable repetitive or DC signal, try a modest waveform average. Confirm trigger stability and increase the count only while the noise floor continues to fall.
- For single-shot or non-repetitive captures, test HiRes: Use it when the acquisition provides oversampling relative to the signal bandwidth. Check that edges and narrow pulses remain intact.
- Limit bandwidth only as far as needed: Choose a cutoff above the highest frequency content required for the measurement. Compare the filtered result with the unfiltered trace.
- Inspect the measurement setup: Check the probe, ground lead, and source impedance. If common-mode pickup is suspected, use an appropriately rated differential probe and confirm its bandwidth and attenuation.
- Recheck measurements after a mode change: Averaging and filtering change noise and may change bandwidth, affecting peak, RMS, and timing readings.
Why a smoother trace may not mean a better measurement
Each technique removes or deemphasizes something: scaling uses more of the ADC range; averaging suppresses noise that varies between repeatable acquisitions; HiRes averages adjacent samples; and filtering rejects frequencies outside a selected band. The apparent improvement is valuable only when the discarded noise is not part of the signal feature being measured. Preserve enough bandwidth and acquisition detail for the question at hand, and treat vendor formulas as ideal guidance rather than a guaranteed accuracy specification.
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