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6.1.7.2.2. Fine Tuning

Setup the system by performing steps 1,4, and 6 from section

6.1.7.2.1.

above.

Tum on the system power.

Adjust the input signal amplitude and offset so that the scanner now steps from -2.0° to 0.0° in

a square wave fashion and at the same

frequency

as before.

Adjust the oscilloscope channel monitoring Vp to lOmV/div. The system should now look

like Figure

25.

Note: Since only the coarse tuning has been performed thus far, your waveform may look

slightly different at this point. However, the same tuning rules still apply.

Tum

R59

CW to minimize the amplitude ofthe undershoot as shown in Figure 26.

........ i ....:.... 1 ....:.... 1 .... •

: . T

T CH1=Pos)

;

•

CH2

{ CH2=Posi

^T..T..;.•....i....:....;

K..,^.^

• + _•

; CH

JmV

(

1 : I : :

h2 SOimV

2.5ms

tion Out

tion In

xt/ifi/

.. ..

•

.81V

'•••!••••!•• ^ •!••••!''••_;_•••• M •• ^ !••••;•••!••• -^

T • . . . .

• i CH1=PositionOut

:••_:; I CH2=PosHion In

:.:::!...::

. . . .

CH2

• •

• ;

^m'

CH1 -

•V f - • •]

.••••J"

:••••:

: : : T : :

;;: + ::

lOmV Ch2 SOOmV M

2.5ms

ExtyiO/ 1.91V

Figure 25

Figure 26

6. Tum

R25 CW

to eliminate the overshoot. See Figure 27.

Iterate steps 5 and 6 until the system settles as well as possible. See

figures

28 and 29.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 67 68

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