On 2021-11-04 11:09, Carey, Samuel Craig via USRP-users wrote:
Howdy,
I’m trying to verify whether an E310 is synchronizing its clock based
on a PPS input signal.
I tried running the test_pps_input UHD example with –source option set
to “gpsdo”, “external”, and the default.
Even after I had disconnected the PPS input and GPS input, this test
reported “SUCCESS!”
I tried measuring the center frequency of an input reference tone from
a separate signal generator and there was an obvious improvement in
accuracy when the PPS was connected vs. not connected.
Why is this test reporting success when the PPS input is not even present?
Is there a better way to check whether the E310 clock is locked to a
PPS input?
This is happening on multiple E310 devices.
The UHD version is reported during test execution as
“UHD_003.009.002-0-unknown”. I cannot easily update the version.
Thanks,
Sam Carey
/R&D S&E, Computer Engineering/
/Sandia National Laboratories/
/Org. 7662, Telemetry and Software Systems/
/Mobile: (505) 239-2698/
On the E310, there's always a PPS signal, even without an external 1PPS
reference. It generates 1PPS internally.
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