User manual

Chapter 3 Software Overview
NI-DAQ User Manual for PC Compatibles 3-124 ni.com
The call sequence is much simpler because the scan interval timer
automatically controls the Track/Hold state of the module during the
interval-scanning operation. Remember that only the MIO and AI devices,
Lab-PC+, PCI-1200, SCXI-1200, and DAQCard-1200 devices work with
channel-scanning using tan SSH module.
SCXI Data Acquisition Rates
The settling time of the SCXI modules can affect the maximum data
acquisition rates that your DAQ device can achieve. The settling times of
the different SCXI modules at each gain setting are listed in Table 3-12 for
three different DAQ devices.
The maximum data acquisition rate you can use will be the inverse of the
settling time for your SCXI module and DAQ device. For example, if the
settling time is listed as 7 µs, your maximum data acquisition rate will be
1/7 µs = 143 kS/s.
If you are using a DAQ device with a maximum acquisition rate faster
than the AT-MIO-16E-2 (such as the PCI-MIO-16E-1), you should use the
settling times and corresponding maximum acquisition rates listed for the
AT-MIO-16E-2.
If you are using a DAQ device with a maximum acquisition rate slower than
200 kS/s (such as the PCI-6032E), you should add 1 µs to the settling time
of your DAQ device. The maximum acquisition rate for the PCI-6032E
would be 1/(10 µs + 1 µs) = 90.9 kS/s.
If you are using a DAQ device faster than 200 kS/s but slower than the
AT-MIO-16E-2 (such as an AT-MIO-64E-3), you can interpolate between
the settling times listed for these devices to calculate an appropriate settling
time and corresponding maximum data acquisition rate.