Hi
Of course the other option is to *finally* break down and buy a digital scope.
They've been out there for 20 years now.
Yes, I did indeed cross over to the dark side last week
Bob
On Feb 12, 2010, at 7:24 AM, Peter Vince wrote:
Hi Robert,
I put a dual-colour (red-green) LED
Hi Bob:
I have been studying digital scopes for some time and have the Rigol
DS1052E on the way.
http://www.prc68.com/I/RigolDS1052E.shtml
Rigol may make the low end scopes that are sold by Agilent. This model
goes for a little over $400 and gets excellent reviews (links on the
above web
I'm using a very bright blue LED and series resistor on the PPS output of my
thunderbolt and it's quite visible. It's not bright by any means, but it is
distracting to see out of the corner of my eye in the rack some days. I
like the dual color LED idea and think I'll make a similar connector
I got a DS1052E a few months ago and I'm quite happy with it. It's
great for looking at events
like this thread has been discussing (although am I the only person who
still owns a Radio Shack
logic probe from the 70's which would work just fine for detecting 1PPS??).
I won't be giving up my
I use both a DS1052E and a couple of Tek scopes. I do like the
DS1052E and think it offers great value at 25% the price of a
comparable Tek. I love the long memory.
The Teks still feel more solid (in an accuracy/reliability/usability
sense). I noticed some trigger jitter on the DS1052E.
Henry
Hi
I went with a used Tek TDS-380. I still live in a fantasy world where it's not
a scope if it doesn't say Tek on it :)
For a 15 year old scope the one I found seems to have pretty good performance.
I've used them enough at work that I knew anything much under 300 MHz and 2
GS/s would
Hi Robert,
I put a dual-colour (red-green) LED in a BNC plug for just this
sort of purpose. No series resistor - the 50-ohm source impedance
limits the current nicely. With dual-colour, I can see both positive
and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very
dim, but
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 8:45:06 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
@febo.com
Sent: Sun, February 7, 2010 8:45:06 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
time to around 100us/div or faster to see it accurately
time and frequency measurement time-nuts@febo.com
Sent: Mon, February 8, 2010 10:15:32 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Try hooking the output to an LED. It's very difficult for me to see the
pulse on my analog scopes but there is no arguing with the blinking light.
-Bob
The 1PPS signal is actually quite strong. I would hook a telephone
receiver or perhaps a little speaker to the 1PPS output and listen. The
signal should make an audible click once per second.
Joe Gwinn
time-nuts-boun...@febo.com wrote on 02/08/2010 12:01:46 PM:
From:
Mark Sims
, 2010 12:21 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The 1PPS signal is actually quite strong. I would hook a telephone
receiver or perhaps a little speaker to the 1PPS output and listen. The
signal should make an audible
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
IIRC the pulse on the 1pps output of the TBolt is very narrow, so it is
pretty easy to miss.
You may need to use a pulse stretcher to see it.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of SAL CORNACCHIA
Sent: 07 February 2010
...@dsl.pipex.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 10:52:03 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
IIRC the pulse on the 1pps output of the TBolt is very narrow, so it is
pretty easy to miss.
You may need to use
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She
07, 2010 11:06 AM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret
-nuts@febo.com
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep.
Bob
-
From: SAL CORNACCHIA salc...@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low
output.
Best
did...@cox.net
To: Time-Nuts time-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty
beefy, the amplitude does dot drop appreciably when loaded with 50 ohms
,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Jugesdid...@cox.net
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full
11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver
is pretty beefy, the amplitude does dot drop appreciably when loaded
with 50 ohms on mine.
Didier KO4BB
Sent from my BlackBerry Wireless
of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 7:45:26 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 8:17:08 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19)
connected in parallel with a small series resistor between
Griffiths bruce.griffi...@xtra.co.nz
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 7:45:26 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL
: Sun, February 7, 2010 8:17:08 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19)
connected in parallel with a small series resistor between the parallled
inverter outputs and the PPS connector.
Open the case and check
John Ackermann N8UR wrote:
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
time to around 100us/div or faster to see it accurately. And you may
need to mess with delaying the sweep to get the pulse on
Sal wrote:
The [PPS] pulse is barely visible on the Tektronix 485 it appears to
be a very low output.
The PPS output can be turned off. Are you sure it is turned
on? (Check with Tboltmon or Lady Heather.)
Best regards,
Charles
___
HI
A lot depends on just how tired the tube in your scope is. Some of these scopes
have spent a lot of hours turned on and wearing out the filament
The easy thing to do is to vary the trigger point and watch the trigger
light. It should tell you if the pulse is there or not. If it's not,
Sal:
I agree with Bob's suggestion below. Set your trigger mode to normal
rather than auto and use DC coupling, not AC. Set a slow sweep speed so
it's easy to see (maybe 10ms per division). You should see a sweep
every second. By varying the trigger level control you can get an idea
of
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