© 2019 Jackson Labs Technologies, Inc. 33
Micro-JLT GNSS™ User Manual
will print 100 of the most-recent time-stamps at once every second. The 100th element is the
time-stamp of the most-recent pulse. The MEMory mode can be configured to process and store the
time-stamps of pulses in background without outputting the time-stamps. PTIMe:STAMp:MEMory?
command in can be used to retrieve the stored time-stamps once.
If the mode is switched to the DIFFer, the unit can display the time-stamp offset between GPS 1PPS
and other PPS signal sources. The source(s) displayed in DIFF mode can be chosen using the
PTIMe:STAMp:DIFFer command in Section 3.5.14 . Note that the PTIMe:STAMp:SOURce ALL
command will be configured automatically when enabling the DIFFer mode.
The following command will query the state of the PTIMe:STAMp:MODE command:
PTIMe:STAMp:MODE?
All time-stamps have the following format:
wwww, ssssss.ssssssssss
Where:
wwww = week number
ssssss.sssssssss = week seconds with nanosecond precision
Below is an example of the results displayed for the PTIMe:STAMp:MODE ASYnc command:
GPS time-stamp: 2059, 520524.000000016
Below is few samples of the results displayed when using the PTIMe:STAMp:MODE OUTput or
PTIMe:STAMp:MEMory? commands:
01: 2060, 167182.000000061; (first time-stamp)
. . .
100: 2060, 167236.000000306; (last time-stamp)
Below is an example of the results displayed for the PTIMe:STAMp:MODE DIFFer command:
EXT Offset: 266 ns
GPS Offset: 5 ns
3.5.13 PTIMe:STAMp:SOURce <GPS|EXTernal|ALL>
The PTIMe:STAMp:SOURce command is unrelated to OCXO disciplining. To select a source for
OCXO disciplining, please refer to Section 3.6.4 .
This command configures the source of PPS signals for time-stamping ONLY. The time-stamping
will only apply to PPS signals from configured source(s) in this command.
By default, the time-stamp source is set to GPS ONLY and external PPS signals are discarded for
time-stamping.
The following command will configure the unit to process PPS signals of both GPS and external
PPS sources:
PTIMe:STAMp:SOURce ALL
Note that the PTIMe:STAMp:SOURce ALL command will be configured automatically when
enabling the PTIMe:STAMp:MODE DIFFer mode in Section 3.5.12 .
The time-stamp source may also be hard-coded to external PPS source with the following command
and the GPS 1PPS signal will be discarded for time-stamping:
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