U-PAD - External USB A/D Converter

U-PAD is an external 24-bit A/D converter for the USB. The U-PAD is a predecessor of the U-PAD2 A/D converter. Discontinued from sale as of 2007.

U-PAD is an external measuring unit for the CSW32 and Clarity stations designed for acquiring data from any chromatograph. U-PAD uses a USB communication channel and thus is directly powered by the PC.

The unit can be connected or disconnected anytime without having to shut down the computer. The unit contains two independent channels, with the latest 24-bit A/D converters, capable of higher effective resolution, especially at higher frequencies and at lower voltage ranges. The input connector is compatible with the internal INT7 board. U-PAD has been discontinued from sale since 2007.


Replacement options


Converter type 24 bit integrating, sigma - delta
Analog inputs differential
Number of channels 2, isolated from USB,
(inputs share common ground)
Input range unipolar and bipolar, each channel independently 156, 1250 or 12 585 mV
Input impedance 1 MOhm
Integration frequency
(Sample Rate)
50 Hz rejection: 6.25, 12.5, 25, 50, and 100 Hz
60 Hz rejection: 7.5, 15, 30, 60, and 120 Hz
Temperature dependence  
Digital inputs 2 TTL (5 V), can be controlled using the built-in opto-electronic unit (5 mA current)
Digital outputs 2 TTL (5V, maximum current load 20 mA), also as relay contacts(100 V/0.5 A)
Dimensions 100 x 55 x 16 mm
Weight 110 g
Power supply from the PC via the USB cable

Effective resolution for various acquisition speeds and input ranges:

  12.585 V 1 250 mV 156 mV
6.25 Hz 22 bit 22 bit 20 bit
12.5 Hz 21 bit 21.5 bit 20 bit
50 Hz 20.5 bit 21 bit 19 bit
100 Hz 20 bit 20 bit 18.5 bit

Possible combinations:

  Windows 10* Windows 8.1* Windows 7SP1*
U-PAD Clarity
Clarity Lite
(both from 6.2)
Clarity Lite
(both from 4.0.3)
Clarity Lite

* 64-bit OS versions are not supported.

Combinations with obsolete operating systems:

  Windows VistaSP2* Windows XPSP3 Windows 2000
U-PAD Clarity
Clarity Lite
(until 7.2)
Clarity , Clarity Lite
(until 7.4.1)
Clarity (until 3.0)
Clarity Lite (until 3.0)

* 64-bit OS versions are not supported.