Difference between revisions of "POT4a measurements"

Revision as of 09:11, 6 February 2006

POT4a : X10 (2-5-06)

DC test

 i = [-3870 -1114 -617 561 1298 2810]
 o = [-8270 -2380 -1323 1200 2779 5980]
 polyfit(i,o,1)
 2.1345   -4.1022

Derivative test (3.8Vpp input triangle)

dVi/dT = 3.8V * 2 * f

Freq  : Output voltage
8 Hz : 50mVpp
13 Hz : 100mVpp
40 Hz : 300mVpp
81 Hz : 600mVpp
160 Hz : 1.2Vpp
438 Hz : 2.4Vpp

fi = [8 13 40 81 160 438]
vo = [.05 .1 .3 .6 1.2 2.4]
dvidt = 3.8 * 2 * fi
1000 * vo./dvidt
= 0.8224    1.0121    0.9868    0.9747    0.9868    0.7210

dropping first and last:
VOut = dVi/dT * 9.901e-4

System Freq Response

• Input 8Vpp sine wave

1/sqrt(2) : 1.23KHz (LP2), 1.8KHz (no LP2)
1/2 @ 1.66K
1/3 @ 1.987
1/4 @ 2.42K
1/8 @ 3.14K

21 dB in 2.55x
18 dB in 1.89x

POT4a : X5 (2-5-06)

i = [-3750  -2104 -1222 -863 -386 -339 -79.9 166.2 496 507 1104 2463 3955 ]
o = [-8040  -4490 -2609 -1840 -820 -727 -166.9 357.9 1065 1086 2365 5250 8510 ]
polyfit(i,o,1)
2.1434    4.1506