Taking Cable Loss Measurements - Tektronix WFM8200 User Manual

Monitoring the SDI Physical Layer

Taking Cable Loss Measurements

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Figure 56: Using cursors to measure jitter
After you have configured the instrument for Eye measurements, you can take
cable loss measurements using the SDI Status display.
NOTE.
The accuracy of the Approx Cable (length) and Source Level readouts
depends strongly on correctly setting the Cable Type and on the quality of the
cable and connections in the signal path. These readouts are derived from the
measured Cable Loss and the specified Cable Type. The Source Level readout of
the SDI Status display indicates the calculated signal amplitude at the signal
source, even when the signal level is greatly reduced at the instrument due to
cable loss. Therefore, the automatic Eye Amplitude measurement (Option PHY
only) may be significantly less than the indicated Source Level.
1. Perform the initial setup for Eye measurements. (See page 105, Eye
Measurement Set Up.)
2. Press the STATUS button to select the Status display.
3. Press and hold the STATUS button to display the pop-up menu.
4. Use the arrow keys and the SEL button to select the SDI Status display.
5. Use the Cable Loss thermometer and readouts to monitor the cable loss.
(See Figure 57.)
WFM8200 and WFM8300 Waveform Monitors