Agilent Technologies 54622D Especificações descarregar pdf (Página 17)

Note that using the Digital Channel Position control (directly under the D7 Thru D0

hardkey) we can move the D0 display up and down on the screen, as needed. Also look at

the top of the graticule in the display above; the D7 _ _ _ _ _ _ _ ¤ D0 box shows that D7 -

D1 are turned OFF, and that D0 is going between logic 1 and 0.

9) If you have a 4-bit counter available (e.g. a TTl 7493 IC or CMOS CD40161 or CD4024-

use 4 of the 7 bits), connect the input to a suitable oscillator. Then, connect digital

channels D0 - D3 to the counter output, with D3 going to the MSB (most significant bit).

10) Press the AutoScale button, and you should see a display somewhat like the one below:

11) Triggering can be a bit tricky at first, and AutoScale doesn't always make a triggering

choice that will give a "good" display. For example, in the display above of D0 - D3, the

trigger source chosen is D2 (with positive edge triggering), and the D3 waveform is

jumping around.

12) Press the Edge hardkey in the Trigger section, and rotate the Entry Knob to select D3

as the trigger source (as shown below). Since D3, the MSB, is the lowest frequency of

the four digital channels, a stable display will result.

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Agilent Technologies 54622D Especificações Página 17