[time-nuts] I can't get a nice waveform from my rubidium !
shalimr9 at gmail.com
Sun Apr 20 13:50:38 UTC 2014
If your scope probe is 1:1 (or set to 1:1 if it has a switch), be aware that most 1:1 scope probes have high capacitance and not much bandwidth. I have as number of 100MHz Tektronix scope probes (in the 10:1 setting) that have a specified bandwidth of 6 MHz in the 1:1 setting. That would definitely make you square wave look like a sine wave.
On April 20, 2014 2:59:44 AM CDT, timeok at timeok.it wrote:
>your output is a square wave on 50 Ohm as write close the connector.
>this filter to have a clean sinewave output.
>On Thu 17/04/14 7:32 AM , Claude Fender wrote:Hello List,
> I've recently bought a Quartzlock 10A R (rubidium). Does anyone has
>experience with this unit?
> 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
>with or whithout the probe.
>So what signal should I except from this rubidium ? Or most probably,
>is wrong with my use of the oscilloscope ?
>(The frequency is ok by the way (+2E-10) and I didn't open the case
> Thanks for any advice
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