Memory depth—a critical parameter for capturing long-duration signals with high resolution—varies significantly among models, influencing their suitability for different applications.
🏷️ Rigol Oscilloscopes ⭐⭐⭐⭐⭐
This report provides a detailed comparison of entry-level oscilloscopes, focusing on memory depth specifications across brands like Rigol, Siglent, OWON, Hantek, and UNI-T.
Table of Contents
Oscilloscope Comparison Table
| Brand | Model | Memory Depth | Bandwidth | Sample Rate |
|---|---|---|---|---|
| Rigol | DS1054Z | 12 Mpts | 50 MHz | 1 GSa/s |
| Siglent | SDS1052DL+ | 32 kpts | 50 MHz | 500 MSa/s |
| OWON | VDS1022I | 5 kpts | 25 MHz | 100 MSa/s |
| Hantek | DSO5062B | 40 kpts | 60 MHz | 1 GSa/s |
| Hantek | DSO5102P | 40 kpts | 100 MHz | 1 GSa/s |
| UNI-T | UPO1104 | 56 Mpts | 100 MHz | 2 GSa/s |
| UNI-T | UPO1054 | 56 Mpts | 50 MHz | 2 GSa/s |
Detailed Breakdown by Model
Rigol DS1054Z
A standout in the cost-effective category, the DS1054Z offers 12 Mpts standard memory, expandable to 24 Mpts with optional upgrades. Its four-channel design and UltraVision technology (30,000 wfms/s capture rate) make it ideal for mixed-signal debugging. The 1 GSa/s sampling rate ensures accurate representation of 50 MHz signals, while serial decoding (included) supports SPI, I²C, and UART protocols.
Siglent SDS1052DL+
With 32 kpts memory, the SDS1052DL+ targets budget-conscious users needing basic waveform analysis. Its 500 MSa/s sampling rate and 50 MHz bandwidth suit low-frequency analog circuits, though the limited memory restricts long-duration captures. The 7-inch display and digital filter functions provide clarity for educational use.
OWON VDS1022I
This USB-powered oscilloscope emphasizes portability with 5 kpts memory and MIT USB isolation.
While its 25 MHz bandwidth and 100 MSa/s sampling rate are modest, the XY/FFT display modes and low noise floor (<100 μV) make it viable for field diagnostics. However, the shallow memory depth limits detailed signal analysis.
Hantek DSO5062B and DSO5102P
Both Hantek models share 40 kpts memory but differ in bandwidth (60 MHz vs. 100 MHz). The DSO5102P’s 1 GSa/s sampling rate captures transient events effectively, though the lack of deep memory hampers prolonged recordings. Notably, these scopes can be firmware-hacked to unlock higher bandwidths (200 MHz), enhancing value.
UNI-T UPO1104 and UPO1054
The UPO1104 dominates with 56 Mpts memory—unmatched in this price range—paired with a 500,000 wfms/s waveform capture rate.
Its full-memory hardware decoding enables real-time protocol analysis (SPI, I²C, RS232) without slowing refresh rates. The UPO1054 offers identical memory at a lower bandwidth (50 MHz), catering to cost-sensitive users prioritizing storage over speed.
What is Memory Depth?
Memory depth refers to the amount of waveform data an oscilloscope can store before it begins overwriting old data. It determines how long an oscilloscope can capture signals at its maximum sample rate. The deeper the memory, the longer the capture time at high resolution.
Why Does Memory Depth Matter?
- Longer Signal Capture Without Sacrificing Detail
A high sample rate is only useful if the oscilloscope can maintain it over a significant period. A shallow memory forces the scope to either reduce the sample rate (losing detail) or capture only a short window of data. - Better Troubleshooting for Complex Signals
When debugging circuits, especially with intermittent glitches or long-duration waveforms, deep memory ensures you can capture and analyze the entire event rather than just a fraction of it. - Accurate Signal Analysis
Shallow memory can introduce aliasing or gaps in data, leading to misleading signal analysis. This is particularly crucial when working with fast digital signals, modulated RF signals, or serial protocols. - Multi-Channel Signal Capture
When using multiple channels, memory depth is divided among them. If an oscilloscope has limited memory, capturing multiple signals simultaneously can reduce its effectiveness significantly.
The Trade-Off in Low-Cost Oscilloscopes
Budget oscilloscopes often come with limited memory depth (e.g., a few kilobytes to a few megabytes). This means that while they may advertise high sample rates, maintaining those rates over longer capture times is not always feasible. Choosing a model with deeper memory ensures that your oscilloscope remains useful for a wider range of applications.
Memory Depth Considerations
- Low Memory (≤40 kpts): Suitable for repetitive signals or short captures (e.g., basic audio waveforms).
- Moderate Memory (12–56 Mpts): Enables detailed analysis of complex signals (e.g., serial protocols, power electronics).
- Trade-offs: Higher memory depths require faster processors to avoid lag during data processing. For instance, the UPO1104’s 56 Mpts demands robust hardware to maintain its 500k wfms/s rate.
Conclusion
The UNI-T UPO1104 offers the best balance of memory depth (56 Mpts), bandwidth (100 MHz), and advanced features like hardware decoding.
The Rigol DS1054Z remains a versatile choice for multi-channel applications, while the OWON VDS1022I serves as a portable, isolated option for field work. Engineers should prioritize memory depth when analyzing long or complex waveforms, opting for models like the UPO1104 to avoid aliasing and capture glitches effectively.
