PCI-1202/1602/180x Series Card
Multi-Function Boards
User Manual/ Ver. 4.8/ Mar. 2015/ PMH-0014-48/ Page: 26
Figure 2.4-3:
Single-ended input with floating signal source
A/D CH0
A/D CH1
A/D CH n
AGND
Es
Figure 2.4-4:
Differential input with floating thermocouple signal
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:
In
Figure 2.4-4
, the maximum common mode voltage between the analog input source and the
AGND is 70 V
p-p
. Make sure that the input signal is under specification first! If the common mode voltage is
over 70 V
p-p
, the input multiplexer will be permanently damaged.
Note: If the input signal is
not thermocouple, the user
should use an oscilloscope to
measure common mode
voltage of Vin before
connecting to PEX-1202 and
PCI-1202/1602/1800/1802
series card. Don’t use a
voltage meter or
multi-meter.
