[time-nuts] T.I. experimenting - newbie question

Joseph Gray jgray at zianet.com
Sun Apr 3 02:32:32 UTC 2011


Thanks for the input. I'll try a bit more experimenting and see what I get.

As for the measured cable length, do I include the BNC connectors or not?

Joe Gray
W5JG

On Sat, Apr 2, 2011 at 8:03 PM, Bruce Griffiths
<bruce.griffiths at xtra.co.nz> wrote:
Bruce Griffiths wrote:
>
>> The measured delay includes the time offset between the start and stop
>> inputs.
>> This is unlikely to be zero, you need to measure it and subtract the
>> offset from the measured result.
>> Since the 5328A can only measure positive time intervals measuring this
>> offset is somewhat tricky to do.
>>
>> Bruce
>>
> The simplest way of measuring the cable delay with the 5328A is to measure
> the delay with a short length of cable between the start and stop inputs and
> then increase the length of cable by connecting the cable to be measured in
> series with the first cable measure the delay again and subtract the first
> measurement from the second.
> This procedure corrects for the start to stop offset as well as that of the
> first cable.
> Then the effects of finite rise time, trigger thresholds and reflections
> should be considered.
> One then has to consider the effects of the various connectors,



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