[time-nuts] PRS-10 PPS output

[Taka Kamiya]

I've seen this with my own.  You are catching the leading edge of ringing of the signal.  

Since the output is CMOS, and high impedance, it really doesn't have enough current to push through low impedance cables.  Try shorter and different cable.  Terminate it with 50 ohms.  Set the trigger level little higher.  In my setup, the cable is actually a very short twisted pair, and only 2" long into a buffer board.

You might want to look at what your PRS-10 is set to, as far as pulse width is concerned.  Also, use much longer horizontal scan rate.  The standard pulse width is 10 MICRO second.  Your image is capturing beginning of the pulse but not the whole of it.

--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
 

    On Friday, April 3, 2020, 3:21:09 PM EDT, Mike Ingle <finndmike62 at gmail.com> wrote:  
 
 Hello fellow nuts,

I just received my PRS-10 with boardlet and heat sink, and I have a
question regarding my PPS output signal.
My output looks strange, (but usable).  I have attached a couple
screen-shots of my scope/
The first is with 50 ohm termination after 5foot of 5g-58 cable, the second
is without termination.

--mike
[image: pps_term.png]
[image: pps_unterm.png]
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