Project Name M-DCPS MASTER Nov. 2014
Project No. SPECIFICATION GUIDELINES 13745 − 10
d. Pushbuttons for selecting schedules.
e. Synchronize to the US Naval Observatory (USNO) time, a minimum of once
every 24 hours, using a GPS receiver.
f. Interface with secondary clocks, either analog or digital, with provision for hourly
and 12-hour corrections.
g. Ability to program for automatic holiday operation.
h. Ability to program for required secondary clock correction.
i. Software selection of user zones (4, 6, or 8) or schedules.
j. Ability to program a combination of zones or schedules for each day.
k. Automatic daylight-saving time change, easily accomplished by user
programming.
l. Display of the next scheduled event on the clock by pushing a single button.
m. A key lock to prevent tampering with the clock or making unauthorized program
changes.
n. Programmable signal duration from 1 to 59 seconds.
o. User programming of different duration for each zone.
p. A "zero" duration programmable for latched operation.
q. Selection of 12-hour or 24-hour display format.
r. A battery backup kit.
s. Instruction panel for rack mount, detailing programming procedure in step-by-
step sequence.
t. AC or DC output buffer modules.
6. The power requirements for the programmable master clock shall be 120 volts AC, 60
Hz. It shall be available for standard rack or for wall mount. The clock shall
incorporate all-solid-state circuitry, and shall meet requirements of ANSI/UL 60065.
7. The master control clock shall be capable of driving both analog and digital
secondary clock simultaneously through solid-state-relay type buffer modules.
8. Secondary Clocks:
a. Flush mounted.
b. Shall be 24-volt DC impulse or 24-volt AC synchronous.
c. Shall be regulated by the master control clock each hour for “minute” correction,
and every 12 hours for “hour” correction.
d. “Reduced Wire System” - Clocks having the ability of using an associated
intercom/paging system’s speaker wires for power and correction are acceptable.
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NOTE TO SPECIFIER: Edit the following item to suit project specific design requirements. Note
that digital secondary clocks may be used only with prior written permission from M-DCPS
Facilities Design and Standards on a per condition basis.
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e. Secondary clocks shall be [analog][digital].
1) [Analog Clocks:]
a) Size: Nominal 12" diameter.
b) Clock motion: Mechanical.
c) Display: Standard 12-hour dial-face with black numerals.
d) Clock dial face shall be white and impervious to discoloration.
e) The hour and minute hands shall be black.
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