Description
A long capture forces a hard choice on a shallow-memory scope: slow the sample rate or lose the event. The Rigol DHO4404 oscilloscope avoids much of that trade with 250 Mpts of standard memory and sampling up to 4 GSa/s. Lost in HCM lists it for rental and sale in Vietnam, and it quotes each configuration separately.
Why record length leads the story
Memory depth divided by sample rate gives the time you can capture. At the top rate of 4 GSa/s, 250 Mpts spans about 62 ms. So a slow startup ramp and a fast glitch inside it can share one record. The optional 500 Mpts then doubles that window at the same rate.
Rigol DHO4404 oscilloscope key figures
| Parameter | DHO4404 |
|---|---|
| Analog bandwidth | 400 MHz |
| Inputs | 4 analog plus external trigger |
| Maximum sample rate | Up to 4 GSa/s |
| Memory depth | 250 Mpts standard, up to 500 Mpts optional |
| Waveform capture | Up to 1,500,000 wfms/s in UltraAcquire mode |
| Vertical resolution | 12 bit |
| Display | 10.1-inch 1280 x 800 capacitive touchscreen |
400 MHz and 12 bits together
Four analog inputs and an external trigger come with 400 MHz of bandwidth. Rigol places the DHO4000 family in low-noise measurements, power analysis, serial buses and mixed laboratory work. In addition, 12-bit vertical resolution gives finer steps than the 8-bit scopes many labs still use.
Bench jobs that use the depth
Power analysis often needs both a long window and fine edges. For example, you can record a converter through a load step, then zoom into one switching cycle. Serial-bus work also benefits, because a long record can hold many frames. However, decode software and probes are separate items, so list them in the quote.
What the photo shows
The picture is a DHO4000 series reference with a dark front panel. A 10.1-inch screen shows a waveform view above an FFT trace, and four BNC inputs sit along the bottom beside two USB ports.
Rent a deep-memory scope or buy one
Rent when one project needs long captures for a few weeks. Buy instead when the lab records long events every day. To start, request a quote from Lost in HCM for the Rigol DHO4404 oscilloscope. Name the memory option, probes and firmware. Then browse other models in the oscilloscopes category. Rigol keeps datasheets at rigol.com, and you can contact SMK Vietnam with questions.
DHO4404 questions
Is the 500 Mpts option included?
Not by default. Standard memory is 250 Mpts, so ask Lost in HCM to confirm which depth your unit carries.
Which family does it belong to?
It belongs to the DHO4000 family, which the listing describes as a higher-performance, high-resolution line.
Does it handle serial-bus work?
Rigol lists serial buses among the family targets. Still, confirm any decode option, because the listing does not assume it.
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