[time-nuts] AC Connector On HP 5061B
bruce.griffiths at xtra.co.nz
Fri Oct 3 16:50:26 EDT 2008
Tom Van Baak wrote:
>> On the DA you will want to ensure all your output cables are of
>> identical length as this will ensure that all signals are in phase at
>> the timebase input(s). It's a small thing really a fraction of a
>> picosecond but it's there and easily compensated for.
> When does the phase of the timebase input mean anything?
> Most test equipment is happy to have a stable external frequency
> input; the phase is immaterial, no? Can someone give me an
> example when relative phase among various random pieces of
> test equipment is important?
The relative phase between 2 inputs to an interferometer (bridge) is
important as is the relative phase between the LO and RF inputs of a
mixer when measuring the internal noise by driving the LO and RF ports
from the same source.
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