Table 1.

The key specifications of BFH350-6AA and NI 9237.

Materials/Device	Parameters	Values with unit	Unit/Remarks
BFH350-6AA	Resistance	350 ± 0.1	Ω
	Base length × base width	10.3×3.9	mm
	Grid length × grid width	6×2.9	mm
	Sensitivity	2.0 ± 1%	—
	Tolerance to nominal values	1000 ± 3	Ω
	Tolerance to means	≤0.5	Ω
NI 9237	Excitation	3.3	V/Four 350 Ω Full Bridges
	Sampling rate	$f_s=\frac{f_M}{256·n}$	fM is the principal time base, and n is an integer from 1 to 31
	Accuracy	± 100	ppm·max.value-1
	Excitation noise	100	μVrms
	Conversion accuracy	2.9802	nV·V-1·LSB-1
Cantilever piece	Material	65 Mn	—
	elastic modulus	1.97×1011	Pa
	Width of strain area	7.00	mm
	Thickness	0.50	mm
	Max.length of strain area	55.00	mm