· Collect also circuit on the Fig. 1.2
· Remove the waveforms or virtual instruments measure the amplitude values of voltage Vm and current Im for enter it in the appropriate table cell in Table 2.1.
· Transfer the value of Xc to the chart (fig 2.1) for a curve
Table 2.1
f, кHz
|
| 0,8
| 0,6
| 0,4
|
Vm,V
| 1,0 uF
| 4.8
| 4.8
| 4.8
| 4.8
|
Vm,V
| 0,47 uF
| 4.8
| 4.8
| 4.8
| 4.8
|
Vm,V
| 0,22 uF
| 4.8
| 4.8
| 4.8
| 4.8
|
, mА
| 1,0 uF
| 27.1
| 21.6
| 16.2
| 11.0
|
, mА
| 0,47 uF
| 14.6
| 11.7
| 8.9
| 6.0
|
, mА
| 0,22 uF
| 6.5
| 5.2
| 3.9
| 2.6
|
=Vm/Im, Ohm
| 1,0 uF
| -178.1
| -223.6
| -298.4
| -438.7
|
0,47 uF
| -329.6
| -410.9
| -543.4
| -806.6
|
0,22 uF
| -740.4
| -915.2
| -1234,1
| -1810.1
|
Хс = 1/( С), Ohm
| 1,0 uF
| -160
| -200
| -260
| -400
|
0,47 uF
| -340
| -420
| -600
| -900
|
0,22 uF
| -720
| -900
| -1100
| -1800
|
Fig 2.1
Xc-frequency