Installing the A/D Converter Card
Analog Inputs

 Tips:  

The A/D converter card is no longer available from Dionex. However, as A/D converter cards may still be used in the field, refer to the corresponding installation instructions below.

This card is not supported under Windows Vista or later.

The analog inputs of the A/D converter card are designed for an input voltage of -10 up to +10V. Most chromatographic detectors yield a maximum voltage of 1V or 2V nominally at their integrator outputs. Therefore, the input range of the A/D converter card is not utilized completely. However, due to its automatic signal amplification, the card yields highly resolved measuring values.

The inputs of the A/D converter card are designed as differential inputs. Thus, ripple voltage, as caused by the fields of the electric power supply, is inhibited because the input signals are not connected between Ground (GND) and High at the A/D card connector, but between High and Low. However, the potential at the high input as well as at the low input must remain between -10V and +10V at any time with relation to ground. To make sure that the ground of the signal source (chromatography detector) and the ground of the A/D converter card have a continuous level of good quality, it is necessary to have a separate ground line between the ground connection at the signal source and the GND connection at the A/D converter card. If a detector has several channels that are to be connected to the A/D converter card, a separate ground line is not required for each of these channels. In this case, it is sufficient if the High and the Low lines are connected correctly. However, if another detector is to be connected to the A/D converter card, connect the ground of this detector to the ground of the A/D converter card, using a separate ground line.