[time-nuts] About HP10544A
bruce.griffiths at xtra.co.nz
Sat Mar 7 22:04:10 UTC 2009
Esa Heikkinen wrote:
>> The capacitance of the 1x probe is too high.
> So I have to check that also: it shows 46 pF on 1x mode and 10.6 pF in
> 10x mode.
> Ok so the main question is that what kind of amplifier I should use with
> 10544A to get a clean signal, if it can't stand even an oscilloscope
> without distortion on it's output? And what do that kind of amplifier
> cost - more than HP10811, for example?
> Many other OCXO's (like thunderbolt's) can be connected directly to the
> 50 ohms. load without any trouble with harmonics.
You can easily construct a suitable buffer amplifier using inexpensive
and readily available parts.
It was an early design, intended to drive a 1k load located very close
to the connector terminals.
The buffer design depends on what reverse isolation you require and what
output signal level.
The venerable LH0033C has been used as a buffer to drive a 50 ohm load.
However it is relatively expensive if its even available.
Since this is RF you dont need the low offset voltage and drift of such
More information about the time-nuts