HBM QuantumX MX840 Operating Manual page 20

20
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
Synchronization with
other device types
Max. distance
between QuantumX
Number of modules
to be synchronized
Synchronization
Synchronization
Synchronization
Voltage supply
HBM
FireWire
QuantumX only
5 m (40 m with
FireWire extender,
modules 500 m via fiber-optics
24
< 1 μs
accuracy
immediately
setting time
Auto
Master 1 QuantumX module
< 1.5 A, looped
through
Ethernet (NTP)
QuantumX, MGCplus all EtherCAT
other
interrogators
100 m (Ethernet)
unlimited CX27 required,
100 μs to 10 ms
approx. 2 h on first immediately
start, approx. 10 min
on restart
external SyncMaster external SyncMaster
, e.g. PC
−
Introduction
EtherCat IRIG−B
all IRIG−B-
nodes nodes
100 m −
unlimited
unlimited MX440A, MX840A
required
< 1 μs < 1 μs
immediately
external IRIG−B
master
− −
QuantumX