Appendix A
Device-Specific Information
©
National Instruments Corporation
A-27
position. Figure A-23 shows the source type switch locations on the front
panel of the BNC DAQPads.
Figure A-23.
BNC DAQPad Front Panel
Figure A-24 shows the analog input circuitry on BNC DAQPads. When the
switch is in the FS position, AI
x
– is grounded through a 0.1
µ
F capacitor
in parallel with a 5 k
Ω
resistor.
Figure A-24.
BNC DAQPads Analog Input Circuitry
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
FS
GS
1
3
5
7
9 11 13 15 17 19 21 23 25 27 29
2
4
6
8 10 12 14 16 18 20 22 24 26 28 30
USER 2
USER 1
PWR
COM
CTR 0
OUT
EXT
REF
DAC 0
OUT
ACH 6
ACH 4
ACH 2
ACH 0
ACH 1
ACH 3
ACH 5
ACH 7
DAC 1
OUT
PFI 0/
TRIG 1
FS
GS
FLOATING SOURCE
GND REF SOURCE
FS
GS
Source Type
Switch
Source Type
Switch
FS = Floating Source
GS = Grounded Source
AI
x +
AI
x –
GS
0.1 µF
5 k
Ω
AI GND
FS