User manual

Masterclock NTD200 Series User Manual – v1 – January 2014

TIME ZONE OFFSETS

The NTD200 digital time display maintains time as UTC

initially. A Time Zone offset or bias can be provided to adjust

the time for display purposes. A bias can be set as a positive

(+) or negative (-) value. Expect a resolution of one second.

DAYLIGHT SAVING TIME

An automatic Daylight Saving Time (DST) adjustment can be

configured separately and in addition to a Time Zone offset.

U.S. STANDARD

DST begins on the second Sunday of March at 2:00 AM (Local

Time) and ends the first Sunday of November at 2:00 AM

(Local Time).

EU STANDARD – EUROPEAN UNION

In the European Union, daylight change times are defined

relative to the UTC time of day. 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.

FREEWHEELING ACCURACY

The NTD200 has built-in provisions to allow it to freewheel

and maintain accuracy for extended periods in the absence of

NTP. These features also allow the unit to be set manually

and run without NTP with precision.

TCXO AND RTC CIRCUIT

The NTD200 contains a precision TCXO (Temperature

Compensated Crystal Oscillator) and RTC (Real Time Clock)

circuit allowing the clock to maintain an accuracy of ± 1

minute per year to the last known NTP input (±165 mSec per

day) when NTP is not present 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 one year with a fully-charged

battery under constant drain.

If the Time Code input is different from

UTC, do not adjust the Time Zone and/or

DST offset. These will adjust automatically.

European customers: Please carefully

consult the section entitled “Device

Settings” for details on setting your

“Summertime Period.”

Daylight Savings Time (DST) adjustments

must be configured using the daylight time

option and not with the Time Zone offset

option in order to ensure proper year-

around operation.