Clarity INT9 - Manual (Page 5)

INT9 A/D converter 1 INT9 acquisition card
1 INT9 acquisition card
This manual describes the use of the INT9 A/D converter with the Clarity
software ver. 2.7 and later.
INT9 is an internal 24-bit A/D converter card that measures the voltages of
chromatographic and electrochemical detectors.
Fig 1: INT9
Brief technical overview
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Up to 4 dataacquisition channels on one card (one and two channel
versions are also available).
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The channels are completely independent sigma delta integrating A/D
converters, used for processing positive and negative voltages.
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4 digital inputs.
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8 digital outputs. The first four are also designed as relay contacts.
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PCI Slot.
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Excellent reliability and temperature stability.
The INT9 card of integration converters is a modernized successor of the
PCI card INT7.
1.1 A/D converter types in general
Prior to collecting and processing the chromatographic signal by a
computer, the analog signal of the detector must first be converted to
digital form using an analog/digital (A/D) converter.
In principle, there are three types of A/D converters – sampling,
integrating and δΣ (Delta-Sigma) - with continuous integration). The INT9
card uses Delta-Sigma integration.
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