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Masterclock NTDS Series User Manual – v2 – December 2012

STATUS LED (LIGHT EMITTING DIODE)

The LED colons on the display will follow the following

protocol after power is applied:

TIME ZONE OFFSETS

The NTDS 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.

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 NTDS has built-in provisions to allow it to freewheel and

maintain accuracy for extended periods in the absence of

Time Code. These features also allow the unit to be set

manually and run without Time Code with precision.

TCXO AND RTC CIRCUIT

The NTDS 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 Time Code input (±165

mSec per day) when Time Code 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 two weeks 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.

LED

STATE

STATUS INDICATION

Flashing

No Reference: The NTDS is not

able to reference NTP

On Solid

Referenced Time: The NTDS is

receiving time referenced from

a NTP server

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