Tektronix CSA7000 Series, Руководство пользователя, Страница: 43 / 62

Reference
Serial Mask Testing & Serial Pattern Trigger User Manual
35
The following are key recovered clock (R Clk) points:
H
Recovered clock is a synchronous clock signal derived from the serial
communications signal by using a Phase Lock Loop (PLL) clock recovery
circuit.
H
The recovered clock function only applies to NRZ source signals with a
signal bit rate that is less than or equal to 2.5 Gb/s. The recovered clock and
recovered data (up to 1.25 Gb/s) are also available at the front panel of a
CSA7000 Series instrument.
H
When you select recovered clock, the instrument attempts to trigger on and
acquire a lock on the derived clock signal. If the source data stream is
interrupted or is very distorted, then the instrument may not acquire a lock or
may loose signal lock, causing an unstable waveform display.
If this occurs, verify that the source signal is correct, and then push the
LEVEL (Push to set 50%) front-panel knob to force the instrument to
reacquire a lock on the data stream.
H
The recovered clock function is not available on TDS7054 or TDS7104
instruments.
Recovered Clock (R Clk)
Key Points