HP 16555A, Руководство по обслуживанию

Страница: 90 / 141

2
Check the clock period. Using the oscilloscope, verify that the master-to-master
clock time is 9.05 ns. *
a In the oscilloscope Timebase menu, select Scale: 2.000 ns/div.
b In the oscilloscope Timebase menu, select Position. Using the oscilloscope knob,
position the clock waveform so that a rising edge appears at the left of the display.
c On the oscilloscope, select [Shift] Period: channel 2, then select [Enter] to display the
clock period (Period(2)). If the period is not less than 9.05 ns, go to step d. If the
period is less than 9.05 ns, go to step 3.
d In the oscilloscope Timebase menu, increase Position 9.000 ns. If the period is not less
than 9.05 ns, decrease the pulse generator Chan 2 Doub in 10 ps increments until one
of the two periods measured is less than 9.05 ns.
*If running HP 16555A software version v2.xx, then measure the master-to-master clock time of 10 ns.
3
Check the data pulse width. Using the oscilloscope, verify that the data pulse width
is 3.480 ns, +20 ps or - 80 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 1 width until
the pulse width is within limits.
Testing Performance
To perform the multicard test
3–63