4. BEFORE YOU BEGIN MEASURING
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4.5
Signal I/O
4.5.1
SDI Signal Input (LV 5770SER08 and LV 5770SER09A)
Figure 4-6 SDI input connectors
*
“/EYE” is displayed on the LV 5770SER09A.
•
Input Format
This instrument supports 3G, HD, HD dual link, and SD signals. Apply signals that this
unit supports to its SDI input connectors.
If you are measuring embedded audio in simul mode, apply signals synchronized to
channels A and B.
See section 2.3.1, “SDI Video Signal Formats and Standards (LV 5770SER08 and LV 5770SER09A).”
•
Terminators
The SDI input connectors are terminated internally at 75
Ω, so there is no need to
connect terminators to them. Connect cables with a characteristic impedance of 75 Ω to
the input connectors.
•
Measurement Channels
To switch to a measurement channel, press A or B. Also, when the SIM key's LED is lit,
you can measure the signal applied to SDI INPUT A and the signal applied to SDI
INPUT B simultaneously (excluding when the status display or the eye pattern display is
in use).
See section 5.4, “Selecting the Input Channel.”
•
Cables
It has been confirmed for each channel that errors do not occur when the LV 7770
receives an 800 mVp-p stress pattern through the following cables.
3G:
LS-5CFB cable, 70 m
HD:
LS-5CFB cable, 110 m
SD:
L-5C2V cable, 260 m
•
Eye Pattern Measurement (LV 5770SER09A)
Use a color bar signal to measure the amplitude of an eye pattern and jitter values.
Because measured values are influenced greatly by the cable that is used, we
recommend that you use a high-quality, low-loss 5C-FB or Belden 1694A measurement
cable. Before connecting the cables, check that the cable connectors are not dirty,
deformed, or otherwise damaged.
Especially if you are measuring the amplitude of eye patterns, rise time, fall time, rising
edge overshoot, or falling edge overshoot of relay instruments, use one of the cables
described above (1 meter in length).
