12.1.2 Configure the multi-weight (FRR) accessory to take
at least two MFR determinations at each load condition used
before changing to the next test load. After switching load
conditions, achieve stable flow by allowing sufficient piston
travel or time to elapse before beginning measurements (see
Note 19). Piston travel distances shall be chosen so that at least
2 seconds elapse during the measurement and that the distances
are determined within 60.4 %.
NOTE 19—Normally, 5 mm of piston travel or 2 min is sufficient to
obtain stable flow after changing test loads.
12.1.3 Adjust the automatic timing device to make multiple
test measurements as required and set to begin timing the first
measurement when the bottom of the piston foot is 46 6 2 mm
above the top of the die. Do not take readings below 18.35 mm
above the top of the die.