Item: A comparison of the digital resistograph with the ram penetrometer
Title: A comparison of the digital resistograph with the ram penetrometer
Proceedings: 1990 International Snow Science Workshop, Bigfork, Montana USA, October 9-13
Authors: R. L. Brown and Karl Birkeland
Abstract: The digital resistograph (DR) is a microprocessor-based probe which is used to rapidly obtain strength index profiles similar to the profiles obtained with the ram penetrometer. The current version of the DR can collect as many as 500 strength profiles in a work day. In this study the DR is compared to the ram penetrometer for repeatability, learnability and ease of use. Additional studies were conducted to determine just how sensitive the DR readings are to penetration rate. The test results did show that the instrument has a repeatability at least as good as the ram penetrometer. The DR has a decided edge in terms of learnability. Two novices were found to give roughly the same DR profiles after a minute of instruction, whereas the ram penetrometer is widely known to show a wide range of results when used by novices. One of the the primary problems with the DR was durability, as the instrument frequently malfunctioned and failed to work properly in cold conditions. The DR shows much promise for becoming a substantial improvement over the ram penetrometer, provided a more reliable and durable version can be engineered.
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Keywords: ram penetrometer, digital resistograph, durability, penetration rate
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