(a) Headform accelerometers shall have dimensions, response characteristics, and sensitive mass locations specified in drawing SA572-S4 (incorporated by reference; see Sec. 572.100) and be mounted in the headform as shown in drawing 92041-001 (incorporated by reference; see Sec. 572.100).
(b) The outputs of accelerometers installed in the headform are recorded in individual data channels that conform to the requirements of SAE Recommended Practice J211, OCT 1988, ``Instrumentation for Impact Tests,'' Class 1000 (incorporated by reference; see Sec. 572.100).
(c) Coordinate signs for instrumentation polarity conform to the sign convention shown in the Free-Motion Headform User's Manual (incorporated by reference; see Sec. 572.100).
(d) The mountings for accelerometers shall have no resonant frequency within a range of 3 times the frequency range of the applicable channel class. [GRAPHIC] [TIFF OMITTED] TC01AU91.173 [60 FR 43060, Aug. 18, 1995]