Chapter 1
Getting Started
1-2
ni.com
Device Self-Calibration
NI recommends that yo
u
self-calibrate yo
u
r USB-621
x
device after
installation and whenever the ambient temperat
u
re changes.
Self-calibration sho
u
ld be performed after the device has warmed
u
p for the
recommended time period. Refer to the
NI USB-621x Specifications
to find
yo
u
r device warm-
u
p time. This f
u
nction meas
u
res the onboard reference
voltage of the device and adj
u
sts the self-calibration constants to acco
u
nt
for any errors ca
u
sed by short-term fl
u
ct
u
ations in the environment.
Disconnect all external signals when yo
u
self-calibrate a device.
Yo
u
can initiate self-calibration
u
sing Meas
u
rement & A
u
tomation
Explorer (MAX), by completing the following steps.
1.
La
u
nch MAX.
2.
Select
My System»Devices and Interfaces»NI-DAQmx
Devices»
your device
.
3.
Initiate self-calibration
u
sing one of the following methods:
•
Click
Self-Calibrate
in the
u
pper right corner of MAX.
•
Right-click the name of the device in the MAX config
u
ration tree
and select
Self-Calibrate
from the drop-down men
u
.
Note
Yo
u
can also programmatically self-calibrate yo
u
r device with NI-DAQmx,
as described in
Device Calibration
in the
NI-DAQmx Help
or the
LabVIEW Help
in
version 8.0 or later.
Device Pinouts
Refer to Appendix A,
, for USB-621
x
device
pino
u
ts.
Device Specifications
Refer to the
NI USB-621x Specifications
, available on the NI-DAQ Device
Doc
u
mentation Browser or from
ni.com/manual
s
, for more detailed
information abo
u
t USB-621
x
devices.
