With accuracy rivaling that of strain-gauges, the USM-3, Ultrasonic Bolt Meter, defines the state of the art in the measurement of the actual clamp load produced by tightening a threaded fastener. The USM-3 can measure fastener elongation or the resulting load, very accurately in fasteners of virtually any material from 1/2 inch to over 50 feet in length.
The USM-3 allows up to 30 hours field operation from 4 'C' cell alkaline batteries.
The measurement is achieved by determining the change in the transit time, of an ultrasonic shock wave along the length of the fastener as the fastener is tightened by any method. The on-board microcomputer automatically interprets this time measurement to display the elongation or load in the fastener. Through the use of high speed digital signal processing and automated diagnostics, the USM-3 minimizes the requirements for extensive operator training.
Ultrasonic Stress Meter, USM-3
Part No. 40334
The Ultrasonic Stress Meter - USM-3 is a hand held instrument including; AC adaptor, nylon carrying case, storage case, transducer cable, RS232 data transfer cable, 4 oz couplant and operation manual.
Overview of Ultrasonic Measurement
The following series of Web pages presents an 'Overview of Ultrasonic Measurement' of fasteners. Ultrasonic measurement provides a very precise method of determining the elongation of a fastener due to tightening. This elongation is proportional to the load force exerted on the fastener.
Introduction
Required Equipment
Bolt Preparation
Calibrating the Ultrasonics
Measuring the Unloaded Lengths
Measuring the Elongation
Producing Reports
Software Updates
As we continue to make improvements to the USM instrument, we may find it necessary to update the software. To download the latest version to your USM, you will need both of the following files. (To do this 'right click' on link and select 'Save Target As...', save to Desktop or a relevant Directory):
Old versions of the software are: Version 1.3 and Version 1.2.
(Tip: When downloading any of the above files, please right click on the link and select 'Save Target As...', change the 'Save as type:' to 'all files', select the relevant Directory or Desktop and then press 'Save').
Sonic Bolt Utility Software
The USM-II can produce reports by sending data over its RS-232 port.
The reports can be sent to a printer directly, to a computer using a communications port, or to a computer using the SonicBolt Software. The report format is designed to be imported into a spreadsheet software for creating graphs and data analysis.
Install SonicBolt Utility Software v2.1e
Disclaimer
This program is for use with the Norbar USM instrument only and is provided without warranty of any kind. Norbar makes no claim to it's suitability or use and shall not be liable for any damages whatsoever caused by installation or use of the software.
(Obsolete) Ultrasonic Stress Meter, USM-2
Part No. 40333
The Ultrasonic Stress Meter – USM-2 is a hand held instrument including; AC adaptor, nylon carrying case, storage case, transducer cable, RS232 data transfer cable, 4 oz couplant and operation manual.