![]() In addition, since the 92 only provide 2 mA IEPE excitation, they will only work as specified when an external preamp which has a built in gain setting is set to 0 dB gain. To prevent the above issues we recommend the use of National Instrument 9234 or other NI DSA cards where IEPE can be disabled. Microphone preamplifiers with their own powering source, and no IEPE support.This DC voltage can cause distortion, noise, and changes in frequency response of non IEPE devices coupled to the input of the 9233. It is extremely important to note that this is the only supported configuration, since the IEPE DC supply from the 9233 is designed such that the IEPE voltage is always on, and attempting to de-activate it by the front panel of noiseLAB, does not turn it off. You may also feel free to contact us at use the NI 9233 with IEPE devices which are powered directly from the NI 9233. Kindly search this page if you have any support issues. ![]()
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