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AD1200 Reference
Single Ended inputs and outputs, having a common ground,
should be arranged to ensure that ground loops are
avoided. Also prevent significant voltages being induced in
ground return leads returning to the single point ground.
Differential outputs from DAC0 and DAC1, similarly
should be shielded tied to AGND at the PC card end.
Digital inputs and digital outputs should be shielded by the
DIGITAL ground.
The Analogue Ground MUST be kept separate from
the Digital Ground especially when connections are
made to external, user supplied, circuits.
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Input Voltage.
The analogue input to the A to D converter MUST be kept
within 20% of the maximum otherwise it may be damaged
or go permanently out of specification. This is of particular
importance when the Programmable Gain Amplifier is
being used, a gain of 1000 when set for -2.5 to +2.5 Volts
input gives a full scale reading from +/-2.5 milli Volts and
a maximum input level of +/-3.00 milli Volts!
Beware it is all too easy to over load the analogue
input at high gain levels.!
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Problems!
If the system fails to power up check the following.
i.)
Ensure that the PC AD1200 card is installed correctly.
ii.)
Ensure that other cards in the PC have not been upset.
iii.) Ensure that the power is connected & PC is switched ON!
iv.) Ensure that the PC AD1200 i/o address is set correctly,
default is 0218h.
If all these have been checked and the PC still does not
power up then there is probably a conflict of i/o address between
the PC AD1200 board and another board in the PC. Ask your
dealer to check this or contact the HELP line as given on Intro
page 2.
Page 50
Installation Guide
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Overvoltage Warning!
Chapter 2
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