[time-nuts] HP 105B Problem?

J. Forster jfor at quik.com
Sun Aug 9 00:32:16 UTC 2009


Hi again,

I do have a HC manual for an older 105B (bought about 30 years ago) but
can't access it at the moment.

> The 105B is one of the products that Agilent sold to Symmetricom which
> means that they don't have any info on it.  Of course, Symmetricom has
> no info on the 105B on their site.

Try CALLING them (telephone) on Monday and talk to an Engineer, NOT their
sales department.

 I haven't talked to Artek Media, but
> they don't list it.

eMail Dave.

> That's why I repeated the test with the signal generator - to see how it
> responded to an improperly terminated cable.

It will depend on the cable Z, source Z, and termination Z.

> The old manual doesn't list an impedance either.  However, the responses
> of the 1 MHz and 100 KHz outputs are consistent with a 50 ohm
> impedance.  The 5 MHz looks more like about 7 ohms based on an
> open-circuit reading of 86 and a terminated reading of 76.  The circuit
> check is basically a peak-reading meter.  A 43 ohm resistor in series
> with each output might be very interesting.  But I'd rather find a
> schematic first.

Try it. You won't break anything.

>> I'm not so sure.
>>
> I'm not at all sure.  :-)
>
> Ed

Best,
-John

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