GPS Synchronization Unit CMGPS
12
2.2 Purpose of the CMGPS
CMGPS is a system extension which allows for controlling (triggering) a CMC
test set at a precisely defined moment via the GPS
1
satellite signal with world-
wide reception (see also section ”Technical Principles”).
Based on this innovative test method by using two or more CMGPS extension
units, two or more CMC test sets can be started simultaneously with a
synchronization error of the CMGPS output of < 1 µs
2
. There may be any
distance between these test sets to be synchronized (see also
section 5 ”Synchronizing Two or More CMC Test Sets”).
By utilizing the GPS signal it is thus possible to ensure identical trigger time of
test processes of several independently operating test units, regardless of the
distance between them.
Figure 2-2:
CMGPS connected to
CMC 356 test set
1. Global Positioning System
2. Depends on the accuracy set by means of the software (please also refer to chapter
5.1 ”Standard Accuracy Mode”).
Antenna
ext. Interf.
ext. Interf.
CMC 356
Pulse out 2
Power supply unit
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