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OFTWARE
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6021GPS GPS Satellite Clock - V01.00
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
Input example for Germany (CET/CEST)
WT (CET)
Ö
ST (CEST)
at 2 a.m. on the last Sunday in March.
Input: from
last
Sunday
in
March
02:00
Changeover WT (Standard / Winter Time)
Ö
ST (Summer Time)
local time
UTC
difference UTC
Ö
local time
01:59:58 h
00:59:58 h
+1 hour
01:59:59 h
00:59:59 h
+1 hour
03:00:00 h
01:00:00 h
+2 hours
03:00:01 h
01:00:01 h
+2 hours
ST (CEST)
Ö
WT (CET)
at 3 a.m. on the last Sunday in October.
Input: to
last
Sunday
in
October
03:00
Changeover ST (Summer Time)
Ö
WT (Standard / Winter Time)
local time
UTC
difference UTC
Ö
local time
02:59:58 h
00:59:58 h
+2 hours
02:59:59 h
00:59:59 h
+2 hours
02:00:00 h
01:00:00 h
+1 hour
02:00:01 h
01:00:01 h
+1 hour
3.6.4 SyncON / SyncOFF
These timers can be used to delay the change of status from QUARTZ to SYNC (SyncON)
and from SYNC to QUARTZ (SyncOFF).
The
SyncOFF
timer serves to provide reception failure bypassing for operation free of fault
messages in difficult reception conditions.
In the event of a synchronization source reception failure (GPS in this instance), the re-
synchronization of the system to quartz status (C) is delayed by the set value. The system
continues to run in synchronization status (R) on the internally regulated, highly accurate
quartz base during this period.
This setting depends primarily on the desired freewheel accuracy.
Example freewheel accuracy calculation
In order to calculate the maximum value to be set for the SyncOFF timer, the desired
minimum system accuracy is divided by the freewheel accuracy value of the quartz. If, for
example, the freewheel accuracy is 1x10E-6 and the desired minimum system accuracy is
5msec. the following calculation results:
0.005s / 1x10E-6 = 5000s =
83 minutes 20 seconds
Ö
The
max
. value to be set for the SyncOFF timer is thus
83 minutes
.
The
SyncON
timer serves on systems operating on a highly accurate, regulated quartz base
to ensure that the system does not synchronize before the quartz base has been accurately
regulated. This timer should be set to
00 as standard
on the Board 6021 GPS.
Value range
SyncON
00 ... 30 min
SyncOFF
0000 ... 1440 min