Q.series
Gantner Instruments GmbH
39
4 Connecting the modules → Synchronization of several systems
1. Use the time signal in the Q.pac Test Controllers based on the
IRIG standard (Inter Range Instrumentation Group) to syn-
chronize all other Test Controllers to one master controller.
The master controller (first device in the chain of devices)
uses its in
ternal clock for the date/time stamp (gray path in
Fig. 4-13). For this type of synchronization you must l
ay syn-
chronization lines between the Test Controllers; the maxi-
mum length of all lines together is 400 m. The master control-
ler transfers the time stamp through an RS-485 link to the
other Test
Controllers. This method achieves the best time
synchronization with the smallest jitter (approx. ±2 μs)
between
the individual modules, because the time informa-
tion passes simultaneously to all
Test Controllers.
2. You connect a radio receiver for time signals, e.g. for DCF77
which conver
ts the received time signal to IRIG-B, to a Q.pac
Test Controller.
As master controller this then synchronizes all other Test
Contro
llers using IRIG (orange colored path in Fig. 4-13) as
with Variant 1. If it is not possible to connect the individual
Test Con
trollers via synchronization lines or this is not
desired, you can also connect a receiver to each Test Con-
troller (Variant 2b).
3. You connect an NMEA-0183 compatible GPS
receiver (Global
Positioning System) to a Q.pac Test Controller, which then,
similar to Variant 1, synchronizes as master controller all
other Test Controllers.
With this method the time information of the GPS signal is
evaluated inst
ead of a pure time signal. In addition you can
also process the position details of the GPS receiver in the
system and assign the measurements (light blue path in
Fig. 4-13). If it is not possible to connect the individual Test
Controllers via synchronization lines or this is not desired,
you can also connect a receiver t
o each Test Controller (also
to Q.gate) (Variant 3b).
4. You define a PC as an SNTP time server which can distribute
the
NTP time stamp to all Q.gate or Q.pac Test Controllers
(dark blue path in Fig. 4-13).
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