National Instruments Welding System 321645c-01 Manual De Usuario
Appendix B
Analog Input Channel, Gain Settings, and Voltage Calculation
NI-DAQ FRM for PC Compatibles
B-4
©
National Instruments Corporation
Internal Channel constants are defined in the following header files:
•
C programmers—
NIDAQCNS.H
(
DATAACQ.H
for LabWindows/CVI)
•
BASIC programmers—
NIDAQCNS.INC
(Visual Basic for Windows
programmers should refer to the
section in Chapter 1,
, for
more information.)
•
Pascal programmers—
NIDAQCNS.PAS
Note
When the channel is
ND_INT_DEV_TEMP
, you can compute the temperature from
the retrieved voltage by applying the following formulas:
For VXI MIOs:
For all other supported E series devices:
Table B-3. Internal Channel Purposes for Analog Input Devices
Internal Channel
Purpose
ND_INT_AI_GND
Analog Input Channels Offset
ND_INT_AO_GND_VS_AI_GND
Ground Differential
ND_INT_AO_CH_0
Analog Output Channel 0 Offset/Linearity
ND_INT_AO_CH_1
Analog Output Channel 1 Offset/Linearity
ND_INT_CM_REF_5V
Analog Input Channels Offset
ND_INT_REF_5V
Analog Input Channels Gain
ND_INT_AO_CH_0_VS_REF_5V
Analog Output Channel 0 Gain
ND_INT_AO_CH_1_VS_REF_5V
Analog Output Channel 1 Gain
ND_INT_AO_CH_1_VS_AO_CH_0
Analog Output Channel 1 vs Analog Output Channel 0
ND_INT_DEV_TEMP
Device Temperature
T
°
C
( )
Voltage
100
×
(
)
32
–
(
)
5 9
⁄
×
=
T
°
C
( )
Voltage
100
×
(
)
50
–
=