Brookfield DV-III Ultra Rheometer - Manual (Page 113)

Brookfield Engineering Laboratories, Inc. Page 113 Manual No. M/98-211-B0104
Brookfield Engineering Laboratories, Inc. Page 113 Manual No. M98-211-E0912
Where:
θ
M
= Angular distance of motor shaft (rad)
w
= Rotational speed (rpm)
t = time of test (seconds)
= θ
cal
x (2 π) x 0.01 S
Where:
S = Radial spring factor (rad/%torque)
θ
cal
= Spring windup angle (revolutions)
=
θ
cal
(V
cal
x t
cal
)
60000
Where:
θ
cal
= Spring windup angle (revolutions)
V
cal
= Calibration speed (fixed at 0.1 rpm) (rpm)
t
cal
= Calibration time (milliseconds)
(time for 0% to 100% spring wind up)
= t
cal
bi
b
cal
x 100
V
V
cal
x
Where:
t
cal
= Calibration time (milliseconds)
(time for 0% to 100% spring windup
during calibration)
bi = Base increment (milliseconds)
b
cal
= base increment calibration torque (%torque/base increment)
V = Speed (rpm)
V
cal
= Calibration speed (rpm)
(fixed at 0.1 rpm)