Choosing a data acquisition recorder is less about finding the most expensive box and more about matching the digitizer to your signals, your computer, and the space on your bench. In the used market, one search can show a low-priced rack-mount SCSI digitizer sitting beside a far more expensive low-noise system with an included HumSilencer. Can the inexpensive unit handle your experiment? Does the high-priced unit justify its cost? The answer depends on which system's interface, resolution, and noise controls match the work you actually do.
Quick Take
For a low-cost Axon digitizer for the lab, the DigiData 1322A is the natural starting point. For a USB-connected system that is easy to reposition, the IOtech Personal Daq/56 fits well. The DATAQ DI-500-16 is the middle-priced model. And if low-noise acquisition is the deal-breaker, the Axon Digidata 1550A deserves serious attention.
Listed-Price Comparison
| Product | Price | Price Bar |
|---|---|---|
| Axon DigiData 1322A 16-Bit System | $249.99 | |
| IOtech Personal Daq/56 USB System | $599.99 | |
| DATAQ DI-500-16 | $635.00 | |
| Axon Digidata 1550A with HumSilencer | $4,999.99 |
The bars show where each asking price falls relative to the four systems; the Axon 1550A dominates the cost scale.
Decision Matrix
| Your priority | The system that fits best |
|---|---|
| The lowest entry cost in the group | Axon DigiData 1322A 16-Bit System |
| USB portability plus 22-bit resolution and screw-terminal wiring | IOtech Personal Daq/56 USB System |
| A middle-priced U.S.-sourced system | DATAQ DI-500-16 |
| Maximum noise control | Axon Digidata 1550A with HumSilencer |
Use this as a shortlist, then read the notes below to check the trade-offs.
Product Notes
Axon DigiData 1322A 16-Bit System
This used Axon Instruments digitizer is the low-price entry point at $249.99. It gives you 16-bit resolution, 16 analog input channels, two analog output channels, 16 digital inputs, and 16 digital outputs. The SCSI interface and rack-mount configuration point to a fixed laboratory setup, and the unit powers on with the POWER and READY indicators illuminated. If you need a channel-rich digitizer for a bench that already has a SCSI-capable computer, this is the most economical way into the group. The limitation is exactly that SCSI connection: if your current computer does not support it, you will need adapters or an older host before the low price becomes useful.
IOtech Personal Daq/56 USB System
At $599.99, the IOtech Personal Daq/56 gives you a 22-bit USB data acquisition recorder with four removable screw-terminal blocks and a USB cable included. That combination makes it the easiest unit here to move between benches or take to a classroom. It was removed from a known-working classroom test station and shows minimal signs of use. The trade-off is the wiring: you will connect your signals through the screw terminals rather than a fixed connector panel, so you need to plan your wiring before you start recording. It is the middle-ground pick for someone who wants USB convenience without stepping up to the expensive Axon.
DATAQ DI-500-16
The DATAQ DI-500-16 is the $635.00 middle-price entry in this set, and its U.S. origin is the clearest headline. It is the pick for a shopper who already knows the DI-500-16 family and wants another unit for a test rack. The model name and country are the main points of comparison here, so it is not the easiest choice for a first-time comparison shopper. If you are familiar with what the model includes, the price is reasonable for a U.S.-sourced system. The limitation is that you need to bring that prior knowledge to the purchase.
Axon Digidata 1550A with HumSilencer
The Axon Digidata 1550A plus HumSilencer is the high-priced option at $4,999.99, and it is the only system in the group that advertises a HumSilencer. It is mint and fully operational. If your work centers on low-noise acquisition, this Axon is built to reduce hum-related interference in sensitive setups, which is exactly what the HumSilencer name suggests. The high price makes sense only when you need that noise performance. The limitation is arithmetic: it costs $4,750 more than the least expensive system here, so it should be reserved for applications where line-noise suppression matters more than budget.
Final Recommendation by Use Case
- Lowest-cost 16-bit lab digitizer: Axon DigiData 1322A 16-Bit System, if your computer can handle SCSI.
- USB-connected acquisition: IOtech Personal Daq/56 USB System for 22-bit resolution and included terminal blocks.
- Established DATAQ users: DATAQ DI-500-16 for another unit at a middle price.
- Noise-sensitive experiments: Axon Digidata 1550A with HumSilencer for low-noise acquisition with an included HumSilencer.
Match the interface and the noise performance to your bench, and the right recorder becomes obvious.
