Operation
Time stamps and timing reference sources
The default timing reference source upon launch of SignalVu-PC is system time.
If you change the source in the Timing Reference tab in the UI from default to one of the externally generated sources
(GPS, PPS, IRIG-B) without a valid signal, the time will remain system time.
If you set the source to GPS, PPS, or IRIG-B after launch of SignalVu-PC (thus changing the time from the default
system time), and then disconnect from that source or otherwise lose the lock to that source, the time used will be that of
the previous externally generated source. This will remain so until you set a different source with a valid signal.
GPS, PPS, and IRIG-B sources will update the xmrk
fi
le to include the following parameters: timestamp_source to indicate
last valid signal type, event_code to indicate software_marker, and each signal pulse to be noted with a time and sample
number. All other event codes, such as triggers and acquisition status events, will reference the last valid external timing
reference signal.
IRIG-B signals
You can use the IRIG-B connector on the RSA7100 to connect to an IRIG-B signal generator. SignalVu-PC allows you to
select one of two IRIG-200-04 standard signals to use for timing reference. IRIG-B is the standard for 1 kHz IRIG signals with
frame lengths of 1 second. SignalVu-PC can detect IRIG-B AM and DC signals.
IRIG-B detection is only available on RSA7100 units with Option GPS and an
IRIG-B
connector.
When switching from any time reference to IRIG-B, it takes several seconds for the time to update with a valid signal.
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RSA7100 Series Quick Start User Manual
