[Test-Equipment] 1 PPS visual

[Raimond]

 I'm looking at the output of a HP/Agilent/Symmetricom 5071A. About 2.4
volts to 4 volts into 50 ohms, 20 microsecond pulse width.

I think My main restriction is the scopes' capability. It's a BK Precision
Corp. Model 2190B 100 MHz Dual-Trace Oscilloscope

Raimond

-----Original Message-----
From: test-equipment-bounces at mailman.qth.net
[mailto:test-equipment-bounces at mailman.qth.net] On Behalf Of mikea
Sent: Monday, June 25, 2007 10:03
To: test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] 1 PPS visual

On Mon, Jun 25, 2007 at 09:44:16AM -0600, Raimond wrote:
>  
>  Any suggestions on the simplest, semi inexpensive way, to be able to 
> look at a one Pulse Per Second wave form? It's seems that most 
> oscilloscopes will not let me look that low in frequency. Basically I 
> want to know, and see if I have a pure, clean 1 PPS waveform.

Is there something about the waveform or your oscilloscope that prevents you
from setting the sweep mode to sweep-only-on-trigger, triggering on the
leading edge, and setting the sweep rate for an appropriate speed per
division to see as much as you want? For a very short pulse (and
correspondingly high sweep rate), you probably will have to crank the
intensity up fairly high to get a sufficiently bright trace.

How long is the pulse? 1 millisecond? 1 microsecond? 1 nanosecond?
What is the pulse amplitude? What are you getting it from? A Trimble or
Ashtech GPS receiver, or from something else (please specify)?

Maybe I'm missing something; if so, please let me know what. 

--
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin
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