ASTM E4-09a

Historical Standard: Standard Practices for Force Verification of Testing Machines

ASTM E4

Scope

1.1 These practices cover procedures for the force verification, by means of standard calibration devices, of tension or compression, or both, static or quasi-static testing machines (which may, or may not, have force-indicating systems). These practices are not intended to be complete purchase specifications for testing machines. Testing machines may be verified by one of the three following methods or combination thereof:

1.1.1 Use of standard weights,

1.1.2 Use of equal-arm balances and standard weights, or

1.1.3 Use of elastic calibration devices.

Note 1—These practices do not cover the verification of all types of testing machines designed to measure forces, for example, the constant-rate-of-loading type which operates on the inclined-plane principle. This type of machine may be verified as directed in the applicable appendix of Specification D76.

1.2 The procedures of 1.1.1-1.1.3 apply to the verification of the force-indicating systems associated with the testing machine, such as a scale, dial, marked or unmarked recorder chart, digital display, etc. In all cases the buyer/owner/user must designate the force-indicating system(s) to be verified and included in the report.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3.1 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 Forces indicated on displays/printouts of testing machine data systems—be they instantaneous, delayed, stored, or retransmitted—which are verified with provisions of 1.1.1, 1.1.2, or 1.1.3, and are within the ±1 % accuracy requirement, comply with Practices E4.

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 determine the applicability of regulatory limitations prior to use.

Keywords

calibration; force range; resolution; verification; Calibration–load testing machines; Constant rate-of-traverse (CRT) test; Force verification; Load-measuring machines; Testing machines; Verification

ICS Code

ICS Number Code 19.060 (Mechanical testing)

DOI: 10.1520/E0004-09A

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Significance and Use Calibration Devices Advantages and Limitations of Methods
3	System Verification Gravity and Air Buoyancy Corrections Application of Force TABLE 1
4	Selection of Verification Forces Eccentricity of Force Procedure
5	Procedure Temperature Equalization Procedure Lever-Type Creep-Rupture Testing Machines
6	Basis of Verification Corrections Time Interval Between Verifications Accuracy Assurance Between Verifications Report and Certificate
7	Keywords A1. VERIFYING THE FORCE MEASURING SYSTEM OUT OF THE TEST MACHINE A1.1 Significance and Use A1.2 Calibration Devices A1.3 Verification A1.4 Calculation and Report
8	X1. DETERMINING RESOLUTION OF THE FORCE INDICATOR X1.1 X1.2 X1.3 X1.4 X1.5 X1.6
9	X2. IDENTIFYING AND DETERMINING MEASUREMENT UNCERTAINTY COMPONENTS DURING AN ASTM E4 VERIFICATION X2.1 X2.2 X2.3 X2.4