Sorry for the delayed response, David. It took me a while to do a bit of
research and I have some clues to why you measured those confusing results.
Please refer to the HP5370B operation and service manual at the following link.
The specifications are on pages 1-3 and 1-4 (pages 12-13 of the
On 10/30/2018 9:55 AM, time-nuts-requ...@lists.febo.com wrote:
My MDO3024 (a modern scope) can measure delay and phase between two inputs,
using the measured zero crossings, including statistics of the measurement.
If you can obtain a similar scope, you could use two identical 1 Meg probes
.
David Kirkby
Sent: 29 October 2018 00:50
To: time-nuts@lists.febo.com
Subject: [time-nuts] How can I measure time-delay of a cable with HP 5370B
time-interval counter?
Im trying to do something which would seem conceptually easy, but Im
getting results I cant understand. I wish to measure
On Mon, Oct 29, 2018 at 8:25 AM Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
>
>
> I have a 100 MHz scope, and can borrow a 300 MHz scope, but I don't have
> anything really fast.
>
> I have a VNA which can make measurements of phase difference down to 300
> kHz, but don't trust
On Mon, 29 Oct 2018 at 09:43, Tom Van Baak wrote:
> David,
>
> Just to see if your setup is working:
>
> 1) Set the pulse generator to as fast a risetime as possible; ns or less.
> Use a low pulse rate (100 Hz is fine).
>
Unfortunately, I don't have such a pulse generator, so I can't run that
On Mon, October 29, 2018 6:57 am, Artek Manuals wrote:
> The next flag for thought is your comment "assuming a velocity factor of
> .7" What if the velocity factor is really .66 ? This would account for
> almost half of the error.
Propagation velocity has an inverse dependence on permittivity,
David
First let me say that I have never used a 5370B
Ignoring the lower frequency stuff for the moment, Can you measure (
accurately) the trigger levels of both the start and stop gates? Slight
differences in the trigger points at each end will will obviously add
error in the measurement.
need a cable checked, I can do it as I have 7S12 plugins.
Dave
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Dr.
David Kirkby
Sent: 29 October 2018 00:50
To: time-nuts@lists.febo.com
Subject: [time-nuts] How can I measure time-delay of a cable
David,
Just to see if your setup is working:
1) Set the pulse generator to as fast a risetime as possible; ns or less. Use a
low pulse rate (100 Hz is fine).
2) Use a BNC tee at the generator, into two equal 2 meter cables, each one into
a 5370B input.
3) Set manual trigger, 50R, 1.0 V, DC
4)
If you can get access to a 2-channel 'scope, try it instead of a TIC
so you can get some clue as to what's happening. I suspect that one
component of the problem is that the supposedly Hi-Z input of the
counter really isn't but has a stub of unterminated cable between the
input connector and
On Sun, Oct 28, 2018 at 8:31 PM Hal Murray wrote:
>
> drkir...@kirkbymicrowave.co.uk said:
> > I'm feeding a sine wave from a Stanford Research DS345 30 MHz function
>
> Are the levels set so it triggers at the same point? It doesn't look like
> it
> in your photo.
>
> Looks like you are
drkir...@kirkbymicrowave.co.uk said:
> I'm feeding a sine wave from a Stanford Research DS345 30 MHz function
Are the levels set so it triggers at the same point? It doesn't look like it
in your photo.
Looks like you are running at 1 MHz. If the stop trigger is a little
lower/earlier than
I suspect it's triggering or aliasing issues if you're using high frequency
sine waves. The canonical way to do that measurement is with a fast-rise-time
edge at PPS sorts of rates. And you'd normally use a common reference to
reduce the number of variables.
John
On Oct 28, 2018, 8:51 PM,
Have you tried with just a single pulse?
> On Oct 28, 2018, at 20:49, Dr. David Kirkby
> wrote:
>
> I'm trying to do something which would seem conceptually easy, but I'm
> getting results I can't understand. I wish to measure the delay (in
> seconds) of a bit of length of coaxial cable.
>
I'm trying to do something which would seem conceptually easy, but I'm
getting results I can't understand. I wish to measure the delay (in
seconds) of a bit of length of coaxial cable.
I'm feeding a sine wave from a Stanford Research DS345 30 MHz function
generator via a coax to the START input
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