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NI C Series Getting Started

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NI-9234
Getting Started
2024-01-25

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  • Page 1 NI-9234 Getting Started 2024-01-25...
  • Page 2 NI-9234 Getting Started........
  • Page 3 NI-9234 Getting Started NI-9234 Getting Started NI-9234 Pinout The NI-9234 provides connections to four simultaneously sampled analog input channels. Figure 1. NI-9234 Pinout AI0+ AI0– AI1+ AI1– AI2+ AI2– AI3+ AI3– To minimize ground noise, prevent the metal shells of the BNC connectors from coming in contact with each other, the modules, or the chassis.
  • Page 4 The NI-9234 uses common-mode bias current to bias the current-limiting diodes when IEPE current is turned off. When the NI-9234 is using grounded signal sources, this current causes an error that is dependent on the AI- lead impedance. This error is approximately 50 ppm of range and 15 ppm of reading per ohm of AI- impedance.
  • Page 5 NI 9234 IEPE Excitation Current The NI-9234 can also provide an IEPE excitation current for each channel to measure ground-referenced or floating IEPE sensors. Typical IEPE sensors have a case that is electrically isolated from the IEPE electronics, so connecting the sensor to the NI-9234 results in a floating connection even though the case of the sensor is grounded.
  • Page 6 NI-9234 Getting Started The NI-9234 analog input channels are referenced to chassis ground through a 50 Ω resistor. To minimize ground noise, make sure the chassis ground is connected to earth ground. Each channel is protected from overvoltages. AC/DC Coupling You can configure each channel in software for AC or DC coupling.
  • Page 7 ) controls the data rate (f ) of the NI-9234. The NI-9234 includes an internal master timebase with a frequency of 13.1072 MHz, but the module also can accept an external master timebase or export its own master timebase. To synchronize the data rate of an NI-9234 with other modules that use master timebases to control sampling, all of the modules must share a single master timebase source.
  • Page 8 When using an external timebase with a frequency other than 13.1072 MHz, the NI-9234 has a different set of data rates. Note The NI 9151 R Series Expansion chassis does not support sharing timebases between modules. ni.com © 2024 National Instruments Corporation.

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