Specifications

11-6
Performance Tests
Introduction
7. Note the histogram which has been plotted. The peak of this histogram defines the
voltage level where the “EYE CROSSOVER” occurs. Record this voltage level.
8. Press the upper right key on the scope to show WINDOW and select Time histogram.
Locate the START marker approximately 20 mV below the EYE CROSSOVER and
the STOP marker approximately 20 mV above the EYE CROSSOVER.
9. Press the ACQUIRE key on the scope, set the number of samples to 1000 and then
press the START ACQUIRING key on the scope (the acquisition progress can be
observed at the top right hand side of the scope display as an increasing percentage
value).
10.Press RESULTS and note the histogram which has been plotted. Locate the LOWER
DISTRB MARKER at the far left of this histogram and the UPPER DISTRB
MARKER at the far right of the histogram.
11.Read the DELTA T value from the bottom of the scope display. Enter this value of
DATA JITTER on the Calibration Data sheet.
Data (inverted) Risetime
1. Perform the Preliminary setup with the exception: re-connect the cable from
channel 3 on the scope to the DATA port.
2. On the scope DELTA Volts menu, set MARKER 1 to the lower level of the signal
(midway into the noise band). Set MARKER 2 to the Hi level of the signal (midway
into the noise band).
3. Press Preset Level 0 to 100% on the scope. This will automatically move markers 1 and
2 to 10 and 90% levels.
4. Center a rising edge transition on the scope display and expand the timebase to
10 ps/div.
5. On the scope DELTA T menu, set the START MARKER to the crossover of the V
marker on the 10% level of the rising edge (midway into the edge noise or jitter). Set
the STOP MARKER to the crossover of the V marker at the 90% level (midway into
the edge noise or jitter).
6. Read the DELTA T value from the bottom of the scope display. Enter this value of
DATA RISETIME on the Calibration Data sheet.
Data (inverted) Falltime
1. Perform the Preliminary setup with the exception: re-connect the cable from
channel 3 on the scope to the DATA port.
2. Center a falling edge transition on the scope display and expand the timebase to
10 ps⁄ div.
3. On the scope DELTA Volts menu, set MARKER 1 to the lower level of the signal
(midway into the noise band). Set MARKER 2 to the Hi level of the signal (midway
into the noise band).
4. Press Preset Level 0 to 100% on the scope. This will automatically move markers 1 and
2 to 10 and 90% levels.