DCF77 Timing
INPUT 2 DCF77
Time: 08:20:08
Date: 06 OCT 2016
DOW: Thu
Z1: 1 Z2: 0
A1: 0 A2: 0
Jitter: ---.- uS, ---.- RMS
In1 - In2 Delta T: ---.- uSecs
Amplitude: 4.8 Volts
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
100% H
Figure 29: DCF77 Signal Connected to Input 2
DCF77 is a one minute time code with 58 bits of time informa-
tion. The 59th second bit is missing, which is normal for standard
DCF77. It can be illustrated as an analog clock as seen in Fig-
ure 30.
DCF77 Marker Details – Figure 30
M:
minute marker (second marker No. 0): 0.1 s
R:
second marker No. 15 indicates service request to the DCF77
signal generation system
A1:
announcement of a forthcoming change from CET to CEST
or vice versa
Z1, Z2:
time zone indication: CET: Z1, 0.1 s, Z2 0.2 s; CEST: Z1
0.2 s, Z2 0.1 s
A2:
announcement of a leap second, 0.2 s
S:
Start of encoded time. Always 1.
P1, P2, P3:
parity check bits
DCF77 Time Zone Arrangement
•
CET is Central European Time, UTC + 1:00
•
CEST is Central European Summer Time, UTC + 2:00.
33
Summary of Contents for 940A
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