20
Introduction
HBM QuantumX
Synchronization using IRIG−B
IRIG−B is a standardized time code.
The digitally or analogously modulated time signal is externally fed to an arbitrary analog
voltage input of type MX840A or MX440A amplifiers to synchronize the QuantumX system
(see assignment, chapter 6.3.1).
The B127 format uses an analogons mudulation. The connection is similar to the one used
with a 10 V voltage sensor. The other formats are BCD-encoded and require connection
analogously to the sensor “Frequency measurement without directional signal” , see chapter
6.11.21.
The amplifiers can record type B000 through B007 and B120 through B127 IRIG−B signals.
All modules connected via FireWire are automatically synchronized as well. The code
includes the time, the year and, optionally, the seconds of the current day.
Comparison of synchronization mechanisms
Characteristic FireWire Ethernet (NTP) EtherCat IRIG−B
Synchronization with
other device types
QuantumX only QuantumX, MGCplus
other
interrogators
all EtherCAT
nodes
all IRIG−B-
nodes
Max. distance
between QuantumX
modules
5 m (40 m with
FireWire extender,
500 m via fiber-optics
100 m (Ethernet) 100 m −
Number of modules
to be synchronized
24 unlimited CX27 required,
unlimited
unlimited
MX440A, MX840A
required
Synchronization
accuracy
< 1 µs 100 µs to 10 ms < 1 µs < 1 µs
Synchronization
setting time
immediately approx. 2 h on first
start, approx. 10 min
on restart
immediately immediately
Synchronization
Master
Auto
1 QuantumX module
external SyncMaster
, e.g. PC
external SyncMaster external IRIG−B
master
Voltage supply < 1.5 A, looped
through
− − −
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