Joseph Gray wrote:
Another newbie question (sorry). I'm using an HP 5315A Universal
Counter and doing some basic experiments to teach myself.
Here is the setup: 100KHz square wave as the "A" input to the 5315A.
Using a BNC-tee to connect a length of RG58A/U from "A" to the "B"
input and another
Nigel,
Actually, when I got the 8140 a few years ago, I modded it to remove
the DC from the rear output. It was designed to power external
modules, which I don't have and don't need.
Somewhere I have a copy of the manual, but I downloaded yours in case
I can't find mine.
Thanks,
Joe Gray
KA5ZEC
In a message dated 07/10/2009 08:17:32 GMT Daylight Time, jg...@zianet.com
writes:
Oops. It has been a long time since I read the manual for the
Spectracom 8140, or used it. I forgot that the rear outputs are fixed
at 10MHz and only the single front output changes with the push
buttons. You
Bruce,
>> I guess I could try using the multiple outputs on the back of the
>> Spectracom 8140, but that would introduce another variable -- the
>> outputs may not be exactly in phase. Also, isn't a pulse or square
>> wave better for doing TI measurements? What the heck. I may try that
>> just to
Joe
Joseph Gray wrote:
>> Did you use a resistive splitter or just a tee to split the signal?
>>
>
> Just a tee. I have tees and terminators at each input of the 5315A as well.
>
>
You need to use a resistive splitter and not a tee to control reflections.
If you don't have one, make one us
> Did you use a resistive splitter or just a tee to split the signal?
Just a tee. I have tees and terminators at each input of the 5315A as well.
I guess I could try using the multiple outputs on the back of the
Spectracom 8140, but that would introduce another variable -- the
outputs may not be
Joe
Joseph Gray wrote:
> Bruce, thanks for the very helpful advice. My comments are interspersed below.
>
>
>> You need to measure this delay.
>> Split the signal in 2 and feed it to both inputs with nominally equal
>> length cables.
>> Measure the difference then swap the 2 cables over and mea
Bruce beat you to it :-)
Joe Gray
On Tue, Oct 6, 2009 at 8:52 PM, Mark Sims wrote:
>
> The problem most likely lies in the difference in the threshold voltage of
> the A and B channels. Unless your counter was properly (and recently)
> calibrated, the trigger points of the channels will be d
Bruce, thanks for the very helpful advice. My comments are interspersed below.
> You need to measure this delay.
> Split the signal in 2 and feed it to both inputs with nominally equal
> length cables.
> Measure the difference then swap the 2 cables over and measure the
> difference.
> Average the
The problem most likely lies in the difference in the threshold voltage of the
A and B channels. Unless your counter was properly (and recently) calibrated,
the trigger points of the channels will be different. The start and stop
signals will not be at the same point on the waveform.
--
Joseph Gray wrote:
> Another newbie question (sorry). I'm using an HP 5315A Universal
> Counter and doing some basic experiments to teach myself.
>
> Here is the setup: 100KHz square wave as the "A" input to the 5315A.
> Using a BNC-tee to connect a length of RG58A/U from "A" to the "B"
> input and
Another newbie question (sorry). I'm using an HP 5315A Universal
Counter and doing some basic experiments to teach myself.
Here is the setup: 100KHz square wave as the "A" input to the 5315A.
Using a BNC-tee to connect a length of RG58A/U from "A" to the "B"
input and another tee with a 50 Ohm ter
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