Description
Probing is where a fast measurement is won or lost. In the Infiniium EXR-Series, the Keysight EXR404A oscilloscope offers 4 GHz of bandwidth on four analog channels. Lost in HCM lists it for rental and sale in Vietnam.

Keysight EXR404A oscilloscope specifications
| Item | Listed value |
|---|---|
| Instrument type | Infiniium EXR-Series oscilloscope |
| Bandwidth | 4 GHz |
| Analog channels | 4 |
The 4 GHz rating gives room for quick edges, while four channels suit a clock and data set or a pair of differential signals. The numbers only tell half the story, though. What reaches the front end depends on how you connect to the circuit.
Fixtures and probes set the real limit
Long leads, loose ground paths and clumsy adapters all add their own behavior to a fast signal. So choose probes for the job, keep connections short and plan the fixture before you power the board. Semiconductor and materials teams also plan for shielding, de-embedding and noise control, because small effects matter at this speed.
Who benefits from 4 GHz
- Telecom and connectivity teams checking link and protocol behavior, once the options and fixtures match the target.
- Chip and materials researchers who characterize devices with careful bias and low noise.
- Power-electronics groups that watch fast switching edges.
- University labs that want headroom for advanced coursework.
Configuration checklist for the Keysight EXR404A oscilloscope
Before you commit, confirm probes, MSO capability, analysis licenses, memory, interfaces and calibration for the exact unit. In addition, share the label and option list of any instrument you are replacing. Similar front panels can hide real differences, so the quotation should name every included item.
Rental or purchase through Lost in HCM
Rent for a characterization campaign, a bring-up phase or a customer demonstration. Buy when the scope serves the lab all year. To start, request a quote from Lost in HCM with your signals, probes, dates and delivery city. You can also view other oscilloscope listings, read about the maker on the Keysight website or contact SMK Vietnam.
EXR404A questions
Does 4 GHz make this scope better than a lower-bandwidth model?
It gives more headroom for fast edges, but only when probes and fixtures keep up. Match the bandwidth to your signals instead of buying the highest number.
What happens with analysis software?
Licenses count as separate items. The listing asks you to confirm analysis licenses for the exact unit, so name them in the quote request.
Can a team try the EXR404A before buying?
Lost in HCM lists rental and sale. Ask for both quotes with your project dates, then compare the cost of each route.
















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