1. Scope
1.1 These practices cover procedures and requirements for the calibration and verification of torque by means of standard calibration devices for static and quasi-static torque-testing machines or devices. These may, or may not, have force-indicating systems and include those devices used for the calibration of hand torque tools. This practice is not intended to be complete purchase specifications for torque-testing machines or devices. Testing machines may be verified by one of the two following methods or combination thereof:1.1.1 Use of standard weights and lever arms with a specific uncertainty of measurement having a traceability derived from national standards of mass and length.1.1.2 Use of elastic calibration devices.1.2 The procedures of 1.1.1 and 1.1.2 apply to the verification of the torque-indicating systems associated with the torque-testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, and so forth. In all cases, the buyer/owner/user must designate the torque-indicating system(s) to be verified.1.3 Since conversion factors are not required in this practice, either inch-pound units, SI units, or metric values can be used as the standard.1.4 Torque values indicated on displays/printouts of testing machine data systems-—be they instantaneous, delayed, stored, or retransmitted-—that are verified with provisions of 1.1.1 and or 1.1.2, and are within the ±1 % accuracy requirement, comply with Practices E X.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
Current national standards do not exist for these calibrations.
Keywords
calibration; torque range; resolution; verification
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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