
Chapter 18 NI 435X Devices
©
National Instruments Corporation 18-3 DAQ Hardware Overview Guide
You can scan any combination of channels in any order. You can also scan
the same channel multiple times in the scan sequence. An example
sequence follows: channel 7, channel 3, channel 0, channel 3, channel 7,
channel 5, channel 6, channel 4.
You can use the 435X devices to perform buffered scans. When the device
is configured, you can use it to acquire data one scan at a time or repeatedly
using a timed buffered acquisition.
The NI 435X performs an A/D conversion once every sample interval.
When the end of the scan sequence is reached, the device continues
acquiring data starting from the first entry in the sequence.
NI 435
X
Acquisition Timing
The onboard counter can perform timing for data acquisition, or you can
perform timing externally in software. The onboard counter controls the
sample rate, which also affects the filtering as shown in Table 18-3.
10 N > 1 2.8 10
50 N > 1 8.8 50
60 N > 1 9.7 60
Table 18-3.
Relationship between Filtering and Available Sample Rates
Harmonics of Noise
Frequencies Filtered
(Hz)
Single Channel
Measurement Mode
(reading/s)
Multiple Channel
Measurement
Mode (reading/s)
10, 50, and 60 10 2.8
50 50 8.8
60 60 9.7
Table 18-2.
Ranges for 435
X
Device Data Acquisition (Continued)
Notch
Frequency (Hz)
Number
of Channels
Reading
Rate (Hz)
Harmonics of Noise
Frequencies Filtered (Hz)
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