Select Measurement Studio from the Filtered By drop-down list and follow the previous instructions. After installing the Device Document Browser, device documents are accessible from Start». Note You can download these documents at ni. In Windows, select Start»All.
Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password? Enter your email address and check your inbox. Please check your email for further instructions. Enter a new password. National Instruments. NI USB Introduction The NI USB Series data acquisition devices provide a USB interface for four channels of bit simultaneous sampling analog inputs with integrated signal conditioning.
Figure 1. Figure 2. Figure 3. Safety Guidelines for Hazardous Voltages If hazardous voltages are connected to the module, take the following precautions. Related Documentation Each application software package and driver includes information about writing applications for taking measurements and controlling measurement devices.
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One such research project requires applying an electrical noise signal to a subject in a controlled manner to quantify its effect on nerve sensitivity. Kimberly-Clark was challenged with creating a system to precisely and repeatedly control the amount of electrical stimuli applied to a subject during stochastic resonance testing while reducing systematic data collection errors. Because it used LabVIEW to control the process, the Kimberly-Clark team was able to apply electrical stimuli, and timing, rather than a manual solution, resulting in test conditions that were consistent and repeatable.
As people age, the effectiveness of their various sensory systems diminish. Solutions to assist people with age-triggered losses in visual and auditory sensory modality are quite prevalent. However, solutions to overcome age-triggered tactile sensory losses are less prevalent.
Loss of tactile sensitivity in the hands may diminish the ability to carry out manual tasks such as writing or pushing a button. Vibrotactile sensory loss in the big toe can lead to an increased tendency for the elderly to lose their balance and fall. Approximately one-third of adults in the U.
Numerous studies have shown that sub-threshold electrical or mechanical noise stimulation may help people overcome functional difficulties due to age-related tactile sensory loss. By increasing the sensitivity of mechanoreceptors, clinicians can effectively boost sensory information in a fashion that is concordant with normal functions.
As indicated in several articles, this technology has been used in clinical studies to investigate its effectiveness in reducing threshold values of tactile sensation.
Both mechanical and electrical noise stimulation have been used in these studies. Our team needed a system to deliver sub-threshold electrical noise stimulation to a test subject. The system requirements included:. We used a to 10 V analog waveform input supplied by an analog port on the NI USB to control the current stimulator output.
Kimberly-Clark designed the system so that one researcher can apply physical stimuli and control electrical stimuli to the subject. The LabVIEW software automatically controls electrical stimuli while prompting the researcher for proper mechanical stimuli. The company used built-in LabVIEW math and waveform functions to send a Gaussian noise signal with specific peak amplitude to the stimulator, which results in the subject receiving a current stimulus matching the wave shape and amplitude of the control signal.
For additional safety, stimulator feedback is monitored by the analog input port on the DAQ module to ensure the stimulator output stays below a predetermined maximum peak. The built-in tools in LabVIEW for waveform generation, waveform analysis, communication with DAQ modules, and other common functions saved considerable development time because the programmer could concentrate on higher-level test process flow. Waveform construction was a critical step in the testing process for two reasons.
First, it is important to prevent any unintended exposure to dc currents because this may be interpreted as a false positive by the test subject.
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