I'll try that out, and let you know how it goes!
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of David McGaw
Sent: Monday, June 25, 2007 11:32
To: [EMAIL PROTECTED]; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] 1 PPS visual Test
Using Normal triggering, any digital scope will allow you to see the 1PPS
edges clearly. Most analog scopes should have enough brightness at
reasonably high sweep rate to see the edges in a darkened room or using a
hood. Turn the brightness up to just below the point where a steady dot is
seen on the screen with no trigger.
David
At 01:02 PM 6/25/2007, you wrote:
Randy,
and that's what I'm looking for, the actual measurement isn't that
important, the fidelity of the pulse is. The concern is, that if I over
drive the out put amplifiers of the distribution amps, I can make a
VERY ugly picture, much like taking a five MHz sine wave, and turning
it into a dirty semi square wave generator.
Raimond
-Original Message-
From: Randy Warner [mailto:[EMAIL PROTECTED]
Sent: Monday, June 25, 2007 10:57
To: [EMAIL PROTECTED]; 'Discussion of precise time and
frequency measurement'
Subject: RE: [time-nuts] 1 PPS visual Test
Raimond,
About the only thing you can do is put the scope in normal trigger
mode, looking for a positive going transition. If you set the
horizontal sweep at about 1mS/cm you should see the rising edge of the
pulse once per second. If you have an old scope without any storage
capability the image will naturally fade quickly. This may take some
tweaking on the trigger settings for the scope, but you should be able
to find a combination of trigger settings and horizontal division size that
will work.
If your scope's trigger circuitry is stable enough you should be able
to decrease the horizontal division size so that you can get a general
idea of what the leading edge of the 1PPS pulse looks like. Depending
on the receiver it should have a very fast rise-time and be a smooth ramp.
Naturally, you will not be able to make any measurements as to the
accuracy of the pulse, but this will give you a quick health check.
Best regards,
Randy Warner
Senior Applications Engineer
Geodetics, Inc.
858.729.0872
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Raimond Melkers
Sent: Monday, June 25, 2007 8:43 AM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] 1 PPS visual
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.
thanks,
Raimond
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