ICP DAS USA PCI-82x Series, Руководство пользователя

Страница: 18 / 82

PCI-82x Series Cards
Multifunction Boards
User Manual, Ver. 1.5, Jan. 2017, PMH-024-15, Page: 18
Figure 2.5-3: Connecting to a single-ended input configuration
A/D CH0
A/D CH1
A/D CHn
AGND
Es
Figure 2.5-4: Connecting to a thermocouple input configuration
A/D CH 0 HI
A. GND
A/D CH n LO
A/D CH n HI
A/D CH 0 LO
Do not join LO to A.GND at the computer
CAUTION
: The maximum allowable common mode voltage between the Analog Input source
and the A.GND pin for the connection shown in Figure 2.5-4 , is 70 V
p-p
. Ensure that the input signal
is below this value before making any connections. If the common mode voltage is above 70 V
p-p
,
the input multiplexer will be permanently damaged.
Note: If the input is not a
thermocouple signal, an
oscilloscope should be used to
measure the common mode
voltage of the V
in
before
connecting to the PCI-822/826,
rather than using a voltage
meter or multimeter.