[time-nuts] Fluke PM6681 triggering

[Magnus Danielson]

On 06/09/2011 07:30 PM, Peter Vince wrote:
> Hi Rex,
>
>       You could try asking the guys at Pendulum.  A couple of them came
> down a gave a talk at the UK's National Physical Laboratory "Time&
> Frequency Club" meeting a few years ago and were very interesting and
> approachable.  It looks like they might have been swallowed by
> Spectracom now - see:
>
> <http://www.spectracomcorp.com/ProductsServices/TestandMeasurement/tabid/1244/Default.aspx>

They are part of Spectracom now, but the people is still there. The 
CNT-81 production stopped only due to lack of key components. The CNT-81 
has a full custom chip in it for the time counter stuff.

I had one for a while but swapped gear with a fellow time-nut.

The manuals is downloadable from Fluke if you follow the PM-6681 search. 
The Fluke connection goes back to they days when Philip Industries in 
Järfälla designed and manufactured a lot of the Philips stuff. Then 
Fluke came into the picture and after number of years Philips killed of 
that branch of the buissness, but Harald took over the remains and 
formed Pendulum. Pendulum itself has swallowed XL in the US and a result 
of that was the development of the CNT-90XL which brings the CNT-90 base 
into higher frequencies, using the base functionality of the CNT-90 with 
the key technology of the XL stuff.

The CNT-81 is a nice box, but the CNT-90 is much more versatile. Still, 
there is room for improvements!

If there is any specifics, let me know and I'll try to find out.

To the best of my knowledge regarding this thread, the most specific 
issue related to triggering on that specific signal. I've often found 
good use for a good scope along-side counters, because you need to do 
the reality check to know what your actual signal is, and then be able 
to trigger properly on it. For more expensive counters, I also want to 
check the signal range. That way I can see if I have any runt pulses to 
avoid or possibly filter out....

Cheers,
Magnus