PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 18
Figure 2-4:
Single-ended input with floating signal source
A/D CH0
A/D CH1
A/D CH n
AGND
Es
Figure 2-5:
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 2-5
, 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 PCI-1002 series
card. Don’t use a voltage
meter or multi-meter.