Device-Specific Sampling Methods

S Series and X Series simultaneous sampling devices use simultaneous sampling. M Series, E Series, all other X Series devices use multiplexed sampling.

C Series devices in CompactDAQ chassis[1]1 cDAQ-9171, 9174, 9178, 9179, 9181, 9184, 9185, 9188, 9188XT, 9189, and 9191, TestScale modules in TestScale chassis[2]2 TS-15000 and TS-15010, CompactDAQ controllers[3]3 cDAQ-9132, 9133, 9134, 9135, 9136, and 9137, CompactRIO controllers[4]4 cRIO-9040, 9041, 9042, 9043, 9045, 9046, 9047, 9048, 9049, 9053, 9054, 9055, 9056, 9057, and 9058 and CompactRIO Single-Board controllers[5]5 sbRIO-9603, 9608, 9609, 9628, 9629, and 9638 use both simultaneous and multiplexed sampling, where all devices in the chassis share the same sample clock. Devices, such as the NI 9215, with an ADC for each analog channel use simultaneous sampling. Devices, such as the NI 9204 and NI 9205, with a single ADC sample in sequence use multiplexed sampling.

Each multiplexed C Series device has a separate convert clock. The convert clock timing is based on the number of channels for that device in the task, not the total number of channels in the task. You can set the convert clock rate on a per-device basis using the Active Devices and AI Convert Rate attributes/properties on the DAQmx Timing property node. The following figure depicts a ten-channel analog input task on two simultaneous sampling C Series devices and two multiplexed sampling C Series devices with different AI convert rates:



1 cDAQ-9171, 9174, 9178, 9179, 9181, 9184, 9185, 9188, 9188XT, 9189, and 9191

2 TS-15000 and TS-15010

3 cDAQ-9132, 9133, 9134, 9135, 9136, and 9137

4 cRIO-9040, 9041, 9042, 9043, 9045, 9046, 9047, 9048, 9049, 9053, 9054, 9055, 9056, 9057, and 9058

5 sbRIO-9603, 9608, 9609, 9628, 9629, and 9638