E-74
SIMEAS Q80 7KG8080
Power Quality Recorder SIMEAS Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 09.02.2011
14.2
Synchronization and time base
Parameter
value typical
min. / max.
Remarks
time base per device without external synchronization
balanced (default)
±
10 ppm
at 25°C (accuracy of internal time base)
Drift
±
20 ppm
±
50 ppm
-40 °C bis +85 °C operating temp.
Ageing
±
10 ppm
at 25°C, 10 years
time base per device without external synchronization
Parameter
GPS
DCF77
IRIG-B
NTP
Supported format
B002
B000, B001, B003*
version 4 (downwards
compatible)
Precision
±1 µs
<5 ms after ca. 12 h
Jitter (max.)
±8 µs
Voltage level
TTL
5 V TTL Pegel
5 V TTL Pegel
---
Input resistance
1 k
W
(pull up)
20 k
W
(pull up)
---
Input connector
DSUB-9
BNC connector "SYNC"
short circuit proof, not isolated
Ethernet
Shield potential input
system ground
---
*using BCD information only
Synchronization with DCF77 for several devices (Master/Slave)
Max. cable length
200 m
BNC cable RG58
Max. number of devices
20
slaves only
Common mode
0 V
theses device must have the same ground
voltage level, otherwise signal quality
problems (signal edges) may result.
Voltage level
5 V
DCF input/output
connector "SYNC"
BNC
Shield potential, IRIG-input
system ground
40