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Making The
Measurement
What you want to know is how much time elapses between the time RAS
goes low and the time CAS goes high again. You will use the X and O
markers to quickly find the answer. Remember you specified the
negative-going edge of the RAS to be your trigger point, therefore the X
marker (green) should be on this edge if the X to Trig field = 0. If not,
follow steps 1 and 2.
1. Touch the Trig to X field. The field will turn light blue. At this time
you can either adjust the X to trigger time using the front-panel
knob, or touch the field again and use the keypad to set the time to
0. Notice that this step has superimposed the X marker (green) over
the trigger marker (red).
2. Touch the Trig to O field. The field will turn light blue. At this time
you should use the front-panel knob to set O marker (yellow) on the
positive going edge of the CAS waveform. It is possible to touch
the field again and use the keypad pop-up to set the desired time,
however, you do not know the time to set it to. The knob allows
you to place the marker wherever you want it to be.
Figure 7-10. Marker Placement
Using the Timing Analyzer HP 16510B
7 - 12 Front-Panel Reference