Problem
In order for your 1PPS signal to be recognised by Paragon-X, you need to make sure that your input signals (both reference and measurement) are at the correct level.
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Front panel 1PPS (aux) input voltageThe maximum 1PPS input voltage which can be applied to the Paragon-X upper aux measurement port depends on its duty cycle. The table below specifies the maximum upper voltage level assuming the V(lo)=0:
So, for example, a 1PPS signal with a 50:50 duty cycle should have a maximum V(Hi) of 2.8V. Application of a signal voltage higher than those in the table may cause damage to your Paragon-X hardware and so must be avoided. For optimal detection of your 1PPS pulse, the threshold should be set in the Measurement Ports tab of the Setup Interface dialogue to a value approximately half of V(Hi).
1PPS signal timingThe measurement 1PPS signal must be received within 500ms of the reference 1PPS input. Signals outside this window will be indicated as a missing pulse in the Paragon-X GUI and CAT by a vertical red line:
1PPS reference inputThe threshold value for your 1PPS reference input signal (connected to the rear of Paragon-X) may also be adjusted, via the References tab of the Setup Interface dialogue:
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