MASTER CLOCK (GNSS Synchronization) QC-5500 Series

QC-55101/55102

QC-55201/55202

QC-55301/55302

*GNS-300 is available separately

SEIKO QC-5500 Series is a high-precision quartz master clock

equipped with a wide variety of functions that meet the needs of

the users, such as synchronization output via RS-422 and daylight

saving time setting. Models operating on AC 110 V (QC-55X01) and

AC 220 V (QC-55X02) are available.

By connecting the GNSS Receiver (GNS-300) for exclusive use with

QC-5500 Series, the internal clock can be adjusted automatically

on a regular basis.

How to Drive Secondary Clocks

Accuracy and Synchronization of Secondary Clocks

The role of the secondary clock in a time-keeping system is to accurately reproduce the

time signal supplied by the master clock. The master clock and secondary clocks are

connected electrically , and the Crystal oscillator frequency of 32.768kHz or 4.194304

MHz/sec. from the master clock is reduced in several stages by the frequency diving LSI

and finally transmitted to the secondary clock as a 1-sec. or a 30-sec. polarized signal of

±24V DC. The secondary clock converts this electrical signal into mechanical energy and,

with the same precision as the master clock, simultaneously displays the correct time.

(1) Master clock function (QC-5510X, QC-5520X and QC-5530X)

Up to 30 secondary clocks can be connected to each channel

(if the current consumption of each secondary clock is 12mA).

(2) External synchronization function

By connecting with an external master clock generating 30-sec

polarized signal output, the loss/gain of the clock is corrected

automatically.

(3) Time correction function

By connecting with the GNSS Receiver (GNS-300), the time

correction is made automatically.