Agilent Technologies Weather Radio 1680 Uživatelský manuál stáhnout pdf (Strana 61)

Chapter 3: Testing Performance

To test the single-clock, multiple-edge, state acquisition

2 Check the data pulse width. Using the oscilloscope, verify that the data

pulse width is 3.000 ns, +0 ps or −100 ps:

a In the oscilloscope Timebase menu, select Scale: 1.000 ns/div.

b In the oscilloscope Timebase menu, select Position. Using the

oscilloscope knob, position the data waveform so that the waveform is

centered on the screen.

c On the oscilloscope, select [Shift] + width: channel 1, then select

[Enter] to display the data signal pulse width (+ width(1)).

d If the pulse width is outside the limits, adjust the pulse generator

channel 2 width until the pulse width is within limits.

Check the setup/hold with single clock, multiple clock

edges

The following setup/hold combinations will be tested.

Setup/Hold Combinations

Te s t

Combination

Setup/Hold

Times

Setup/Hold

Window

Sample Position

(in middle of Window)

1 5.0/-2.0 ns 3.0 ns -3.5 ns

2 -1.5/4.50 ns 3.0 ns +3.0 ns

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 173 174

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Agilent Technologies Weather Radio 1680 Uživatelský manuál Strana 61