Tektronix TG8000 User Manual page 360

HD3G7 HD 3 Gb/s SDI Video Generator module
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PLL STATUS. This diagnostic displays the following:
Jit – Indicates the condition of the jitter attenuator used to clean up the
clock recovered from the input signal. The condition can be reported as
Lock (locked) or Unlk (unlocked). This diagnostic readout is only valid
and significant when in converter mode. If in converter mode it should read
"locked". If not, there may be a problem with the input signal or the module.
Flex0 – This circuit is not used, so the readout may show locked or unlocked.
The state has no bearing on instrument operation.
Flex1 – Indicates the state of the flexible clock generator. This readout should
show Lock (locked) and is only valid and significant when the instrument is
in generator mode. An Unlk (unlocked) reading might indicate a problem
with the module or mainframe.
DDS STATUS. This diagnostic displays the following:
DDS0 Phase – This circuit is not used, so the readout may show locked or
unlocked. The state has no bearing on instrument operation.
DDS1 Phase – Indicates that the flex clock circuit is correctly aligned with
the internal frame pulse. This readout should show Lock (locked) and is only
valid and significant when the instrument is in generator mode. An Unlk
(unlocked) reading might indicate a problem with the module or mainframe.
If the instrument is in converter mode, this readout is not active and may
show locked or unlocked.
CRC ERRORS. This diagnostic shows how many CRC errors are detected from
the input signal. If the output signal of the conversion process is not what you
expect, or the jitter attenuator is having trouble locking, then you should check
this readout for errors on the input.
It is normal to see errors when you are connecting or disconnecting the input, or
when no input is present. When this occurs, clear the errors after the connections
are made by using the Diagnostics > Clear CRC Errors submenu. After clearing
the errors, monitor this readout if you have concerns about the input signal.
This diagnostic displays the following:
Y – The number of errors detected on the Y portion of the active picture
area of the input signal.
YANC – The number of errors detected on the Y portion of the ancillary
data space in the input signal.
C – The number of errors detected on the C portion of the active picture area
of the input signal.
CANC – The number of errors detected on the C portion of the ancillary
data space in the input signal.
CLEAR CRC ERRORS. Press the ENTER button to clear the CRC error counters.
TG8000 Multiformat Test Signal Generator User Manual