'Wet' snow vs. 'dry' snow. The size and make up of a snowflake depends on how many ice crystals group together and this will be determined by air temperatures. Snowflakes that fall through dry, cool air will be small, powdery snowflakes that don't stick together.
Calibration Services. NI offers high-performance hardware and is committed to helping you maintain that performance for years to come. Calibrating your test and measurement hardware regularly is critical to ensuring quality measurements and traceability. With multiple levels of calibration available worldwide, in addition to flexible options for service, NI can help you maintain peak performance while meeting your budgetary and uptime needs.
Calibration certification is the process of documenting the measurement accuracy and linearity of an ultrasonic instrument under specific test conditions. In the case of flaw detectors, both horizontal (depth or distance) and vertical (amplitude) certifications are provided.