Tektronix OI1125, Instruction Manual

Page: 51 / 88

Performance Verification
OI1125 E/O Transmitter Instruction Manual
39
a. In the All Timebases box, set the Mode field to Short Term Jitter from
the drop-down menu.
b. Set Units to Seconds.
7. Select the Trig tab to set the trigger parameters.
a. In the Trigger Source box, select External Direct.
8. Close the Setup window.
Preview the Waveform.
9. Enable the laser by turning the keyswitch clockwise (to the unlocked
position). The Laser On LED and Laser Output Active LED both light.
10. Turn on the channel that the optical module is plugged into.
11. Press Autoset.
12. Press the Clear Data button and then the Run/Stop button on the oscilloscope
to display a waveform as shown in Figure 15 on page 40.
NOTE . You may need to adjust the location of the rising edge of the waveform,
and the size of the histogram box to have your display resemble Figure 15.
Follow the procedure in Take Measurements to get the correct display.
13. Select the Hist tab to set the histogram parameters.
a. In the source box, set Source to the optical channel you are using.
b. Check the Enable Histogram box.
c. Check the Horizontal box.
d. Check the Use Waveform Database box.
e. In the Display box, check Histogram and Linear.
Take Measurements. Refer to Figure 15 as you align the waveform.
1. Press the Clear Data button, and then the Run/Stop button on the oscillo-
scope to display a waveform as shown in Figure 15.
2. Align the rising edge of the waveform with the center of the oscilloscope
graticules.
3. Reduce the vertical size of the histogram box as small as possible.