Tektronix OI1125, Инструкция по эксплуатации

Страница: 58 / 88

Performance Verification
46
OI1125 E/O Transmitter Instruction Manual
Oscilloscope Measurement.
Set the TDS8000 Vertical settings as follows:
1. Select the Horz tab to set the horizontal parameters.
a. In the All Timebases box, set the Mode field to Short Term Jitter from
the drop-down menu.
2. Select the Mask tab to set the mask parameters.
a. Set Source to the optical channel you are using.
b. Check the Enable Mask Counts box.
c. Check the Use Waveform Database box.
d. In the Display box, check the Mask box.
e. Set Communication Standard to SONET
→
OC-48.
f. In the Mask Margins box, check the On box, and set the Margin field to
5%.
3. Select the Meas tab to set the measurement parameters.
Steps 3a through e assign measurement functions to generic oscilloscope
measurement names. For example, you assign Extinction Ratio (dB) to Meas 1.
(See Table 14).
a. In the Meas x field, select Meas 1.
b. In the source tab, in the Signal Type box, click NRZ.
c. Click Select Meas.
d. From the drop-down menus, select NRZ Amplitude
→
Extinction Ratio
(dB). Meas 1 is now renamed Extinction Ratio (dB).
e. Repeat steps a through d for Meas 2 through Meas 4. When doing step d,
refer to Table 14 below for the correct menu path and function.
Table 14: Measurement function menu paths
Generic name Parent menu name Measurement function
Meas 1 NRZ Amplitude Extinction Ratio (dB)
Meas 2 NRZ Timing Pk-Pk Jitter
Meas 3 NRZ Amplitude Crossing %
Meas 4 NRZ Amplitude Average Optical Power (dBm)