[time-nuts] I can't get a nice waveform from my rubidium !
GandalfG8 at aol.com
GandalfG8 at aol.com
Thu Apr 17 04:06:34 EDT 2014
Hi Claude
I don't have any specific experience of this unit but suspect your problem
may be down to impedance matching.
The manual for the Quartzlock A10-M specifies the output impedance as
being 50 ohms nominal and it would be reasonable to assume this is the same.
Scope inputs and scope probes won't present such a low impedance so the use
of a coaxial pass through 50 ohm termination would be my first suggestion,
if you haven't got one to hand just try hanging a 50 ohm resistor,
anywhere between 47 and 56 ohms say, across the output and ground and monitoring
across that.
This is quite a common problem, especially on supposedly square wave
outputs, so chances are your unit is fine.
Regards
Nigel
GM8PZR
In a message dated 17/04/2014 08:17:12 GMT Daylight Time, labtf1 at yahoo.fr
writes:
Hello List,
I've recently bought a Quartzlock 10A R (rubidium). Does anyone has
experience with this unit?
My
unit has two outputs with no options. The problem is the shape of the
waveform (see attachments), it's the same shape for the two outputs.
When I
connect an output directly to the oscilloscope, the shape is nearly
"squared" and when I use a probe, the shape is nearly "sine" !
When I send a 10 MHz signal from a generator, the waveform is a clean sine
with or whithout the probe.
So what signal should I except from this rubidium ? Or most probably, what
is wrong with my use of the oscilloscope ?
(The frequency is ok by the way (+2E-10) and I didn't open the case yet)
Thanks for any advice
Claude
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