eDAQ EA168, Руководство пользователя

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Quad pH/mV Amp 27
A P P E N D I X A
A
Technical Aspects
This appendix describes the some of the important technical aspects of
the Quad pH/mV Amp. You do not need to know the material here to
use the pH/mV Amp. Please remember that user modification of the
equipment voids your rights under warranty.
Quad pH/mV Amp Operation
The Quad pH/mV Amp and other eDAQ Amps have been designed to
be used with an e-corder system. The pH/mV Amp is effectively an
extension of the e-corder’s analog input channels. It provides:
• very high impedance, electrically isolated inputs suitable for direct
connection to pH or other ion selective electrodes.
• software controlled filtering of the signal.
• reference electrode input.
• software selectable gain ranges.
Technical Description
As with other eDAQ Amps, all internal functions of the Quad pH/mV
Amp are controlled from the e-corder by sending information on a
special communications connection called the I
2
C (eye-squared-sea)
bus. This connection supplies power to the eDAQ Amp as well. eDAQ
Amps are connected to the analog input channels of the e-corder via