Is It Possible to Cascade the Channels of NI PXIe 6739?

Updated May 30, 2019

Reported In

Hardware

  • PXIe-6738
  • PXIe-6739

Software

  • LabVIEW

Driver

  • NI-DAQmx

Operating System

  • Windows

Issue Details

I am using the NI PXIe 6739 module for controlling my DUT channels. My DUT requires more voltage and current than what a single channel of PXIe 6739 can provide. Is it possible to cascade the channels of NI PXIe 6739 for higher voltage or current requirement? Can I join two channels together to do this? 

Solution

No, you should not extend the maximum output range (Current/Voltage) of the card's channels by cascading them in series.
 
Please use external circuitry to amplify your signal after it comes out of the module.

Additional Information

The NI PXIe 6739 does not offer isolated outputs or a combination of isolated and non-isolated channels, therefore not allowing Stacking Voltages or Current .

Analog Output Ground—AO GND is the reference for AO. When AO GND is listed next to an analog signal name, it is the dedicated ground reference for those signals (e.g. AO GND 2/3 is the ground reference for AO 2 and AO 3). Both ground references—AO GND and D GND—are connected on the device. NI 6738/6739 devices and modules provide no isolation. Refer to the user manual to know more.

Analog outputs are grouped into four-channel banks. Each bank of four channels is supported by one DAC per bank, and can select between the AO Sample Clock or a software-timed convert.
 
There are other hardware modules you can consider to make this happen:
  • If your power supply offers isolated outputs or a combination of isolated and non-isolated channels, you can easily extend the maximum output range by cascading channels in series.
  • If your power supply offers isolated outputs or a combination of isolated and non-isolated channels, you can easily extend the maximum output range by cascading channels in parallel. This type of configuration is sometimes quicker or even costs less than purchasing a new higher-current power supply.
For example, you can extend the current output of a single NI PXI-4110 power supply by cascading an isolated and non-isolated channel.

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