DAQ USB Modules
The DAQ USB modules provides similar features as the analog input PCI cards, bringing more operative use than the PCI cards; they may be asserted especially in mobile or laboratory measurements.
All types of modules are intended for USB rev. 1.1 full speed, or USB rev. 2.0 full speed.
All-purpose mutlifunctional USB modules
Basic series USB modules (max. 40 kHz ADC)
| Type | AIN | AIN connect |
ADC | ADC Buffer |
DAC | DAC Buffer |
CNT | DIO |
|---|---|---|---|---|---|---|---|---|
| UDAQ-1408A | 8x S.E. | pluggable terminal block | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1408E | 8x S.E. (isolated) |
pluggable terminal block | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1408CA | 8x S.E. | D-Sub 25 | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1408CE | 8x S.E. (isolated) |
D-Sub 25 | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1416CA | 16x S.E. | D-Sub 25 | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1416CE | 16x S.E. (isolated) |
D-Sub 25 | 14-bit 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
Advanced series USB modules (max. 200 kHz ADC)
| Type | AIN | AIN connect |
ADC | ADC Buffer |
DAC | DAC Buffer |
CNT | DIO |
|---|---|---|---|---|---|---|---|---|
| UDAQ-1416AL | 16x S.E. | D-Sub 25 | 14-bit 200kHz |
256kB | - - - | 256kB | 2 | 4+1 |
| UDAQ-1416AS | 16x S.E. | D-Sub 25 | 14-bit 200kHz |
256kB | 2x 12-bit 200kHz / 1MHz |
256kB | 2 | 4+1 |
| UDAQ-1416DL | 16x S.E./ 8x DIF. |
D-Sub 25 | 14-bit 200kHz |
256kB | - - - | 256kB | 2 | 4+1 |
| UDAQ-1416DS | 16x S.E./ 8x DIF. |
D-Sub 25 | 14-bit 200kHz |
256kB | 2x 12-bit 200kHz / 1MHz |
256kB | 2 | 4+1 |
| UDAQ-1432AL | 32x S.E. | 2x D-Sub 25 | 14-bit 200kHz |
256kB | - - - | 256kB | 2 | 4+1 |
| UDAQ-1432AS | 32x S.E. | 2x D-Sub 25 | 14-bit 200kHz |
256kB | 2x 12-bit 200kHz / 1MHz |
256kB | 2 | 4+1 |
Discontinued USB modules
| Type | AIN | ADC | ADC Buffer |
DAC | DAC Buffer |
CNT | DIO |
|---|---|---|---|---|---|---|---|
| UDAQ-1208 not available, replacement type UDAQ-1408A |
8x S.E. | 12-bit/ 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1408 not available, replacement type UDAQ-1408A |
8x S.E. | 14-bit/ 40kHz |
1kB | - - - | - - - | 2 | 2+1 |
| UDAQ-1216AL not available, replacement type UDAQ-1416AL |
16x S.E. | 12-bit 200kHz |
256kB | - - - | - - - | 2 | 4+1 |
| UDAQ-1216AS not available, replacement type UDAQ-1416AS |
16x S.E. | 12-bit 200kHz |
256kB | 2x12-bit 200kHz (stream) 1MHz (cyclic) |
256kB | 2 | 4+1 |
Several hints for the USB module selection
- For achieving maximal sampling frequency it is necessary to reserve enough PC performance and to disable all running applications that need lots of system resources. The stability of the transfer during the PC load is higher when the USB module provides larger data buffers.
The basic UDAQ modules (e.g. UDAQ-1408A/E) provide small buffers. The maximum available sampling frequency depends on the used PC configuration.
At the testing PC (Celeron 600MHz, 128MB RAM, Windows 98SE, no parallel applications running) the maximal sampling frequency of 40 kHz has been reduced to 20 kHz when being saved to HDD (data were sampled to RAM). When PC fitted with 2GHZ processor was used, there was no problem with saving data even with other applications saving to HDD simultaneously.
The modules that provide the data buffers of hundreds of kB may handle the transfer dropouts of even hundreds of ms, so they can operate reliably at the highest sampling rates. The limiting parameters are not short-term transfer failures due to the operating system load, but the overall data throughput of the USB line. We have achieved the continuous data throughput of 400 kB/s (that means 200 kSamples/s) at the Pentium 4 at 2GHz, Windows XP with no applications running simultaneously. - The modules that provide the D/A converters with the data buffer may generate the signals in the data stream mode (i.e. getting the signal data from the PC memory) or cyclic data mode (the module generates the signal from the data block saved in the module buffer; data are no longer transferred during the generation).
- The overall data throughput of the UDAQ modules with 2x 256 kB buffers allows the user to achieve continuous transfer rate more than 400kB/s; that means e.g. 200kSamples/s of measuring or 100 kSamples/s of measuring + 100 kSamples/s of generating.
- The power consumption of the UDAQ-1208/1408/1408x/1408Cx/1416Cx family (up to 160mA) satisfies direct connecting to the USB host adapter or active USB hub. The power consumption is too highr for connecting through the passive USB hub.
Other modules are USB 2.0 compliant in all USB-powered device modes or are supplied with the power supply (i.e. self-powered device).