Hi Tushar,
It may be possible for a field engineer to visit your site locally. However this engineer would be unable to affect any modifications or repairs, and would only be able to verify that the 8175 has malfunctioned and indeed needs repair. At this point, the unit would need to be sent into us.
In order to initiate an return merchandise authorization, please give our technical support a call at 1-866-275-6964, so we can obtain all the required information from you.
Knowing this information, if you'd still like to have a field engineer visit you, please reply with your company name, and location of the facility so we can verify which individuals serve your region. You can alternatively call in to the number listed above to speak with one of our support engineers.
Best Regards,
Evan R.
Applications Engineer
National Instruments
http://www.ni.com/support