Tektronix WFM 601i, Руководство пользователя

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Functional Overview
2–12
WFM 601i Serial Component Monitor
0
INVALID
FF CRC ERR SEC
STATUS
5
VALID
AP CRC ERR SEC
STATUS
F1 AP CRC VALUE
F2 AP CRC VA;UE
CHANGE SINCE RESET FOC8
EA26
YES
0 DAY
10:12:25
ELAPSED TIME
SIGNAL PRESENT AUDIO
525 LINES 1 2 3 4 5 6 7 8
10 BITS
FORMAT ERROR
OTHER ANC DATA
DISPLAY
STATUS
FORMAT
RESET
Figure 2-5: Basic Status Screen
The middle half of the screen gives error rate information. EDH is supported
with full field and active picture asynchronous errored seconds readouts. Also,
the computed active picture CRCs for both monochrome fields is given, and a
flag indicates if they have changed in value (this is useful for error detection with
a fixed pattern source when incoming EDH is not available). Finally, the elapsed
time since the errored seconds readouts were last cleared (via the RESET soft
key) is shown. This particular screen shows that only the AP CRC in the
incoming EDH error status packet is valid so only AP errors can be counted via
EDH. 5 AP errored seconds have been counted since the last reset, 0 days, 10
hours, 12 minutes, and 25 seconds ago. The present F1 and F2 APCRC’s are
F0C8 and EA26, respectively. The value of one or both CRCs has changed at
least once since the last reset (CHANGE SINCE RESET = YES).
The embedded audio, format error, and other anc data fields are not displayed
when these conditions are missing. Figure 2-6 shows how the STATUS screen
would look in this case.
Only EDH anc data is present. Both full field and active
picture CRCs are incoming for error monitoring.