User manual

Masterclock RC 500 User Manual – v2014.01.01
31
Time Zone Offsets
A Time Zone offset or bias can be used to adjust the
time for display purposes because the default is UTC
time. Local or custom time can be set as a positive (+)
offset indicating that the unit is earlier than UTC time or
negative (-) offset indicating the unit is later than UTC
time. See page 30.
DAYLIGHT SAVING TIME (DST)
An automatic DST setting can be configured separately
and in addition to a Time Zone offset. The RC500
provides flexible configuration options supporting most
DST standards through the Configuration Menu (p. 30).
USA and Canada
DST begins on the second Sunday of March at 2:00 AM
(Local Time) and end the first Sunday of November at
2:00 AM (Local Time).
EU Standard – European Union
Summertime period begins at 1:00 AM UTC on the last
Sunday of March and ends at 1:00 AM UTC on the last
Sunday of October.
Please carefully consult the section entitled “Device
Settings” (p. 13 for Standalone and p. 22 for Network
input) for details on setting DST.
Freewheeling Accuracy
The RC500 has built-in provisions to allow its internal clock to freewheel and maintain accuracy
for extended holdover periods in the absence of a reference. You can also set the unit manually
(Standalone Configuration) and operate without a reference input.
TCXO AND RTC CIRCUIT
The RC500 contains a precision TCXO and RTC circuit allowing the clock to maintain an accuracy
of ±1 minute per year to the last known Time Code input (±165 mS per day) when a time
reference is not preset or cannot be decoded (i.e. freewheeling mode).
MAINTENANCE-FREE RECHARGEABLE BATTERY
The RTC and TCXO are maintained continuously from a rechargeable battery circuit during
periods of power outage. Minimum holdover period is two weeks with a fully-charged battery.
The battery automatically charges whenever the unit is powered and it requires no maintenance.
NON-VOLATILE CONFIGURATION
The RC500 interprets time
input as UTC. If the time
reference to this unit is not
UTC, do not adjust the Time
Zone and/or DST offset.
To ensure proper hands-
free year-around operation,
DST adjustments must be
configured using the
“Daylight time” option and
not with the “Time Zone
offset” option.