[time-nuts] FE-5680A Results so far
Chris Albertson
albertson.chris at gmail.com
Thu Dec 29 08:28:24 UTC 2011
On Wed, Dec 28, 2011 at 11:14 PM, mike cook <michael.cook at sfr.fr> wrote:
> Hi,
> Just got my cheapo 5680A. It was accompanied by a little teddy bear
> clutching a L7805CV !
>
> Got a couple of questions.
>
> 1) What is the expected 10MHz peak to peak voltage. FEI doc seems to
> indicate 0,5V but I am getting only 200mv.
>
I'm getting a lot more, about 2V peak to peak. What are you loading it
with, I'm using a 10X scope probe. How are you measuring the voltage?
> 2) What is the sensitivity to 15V input level. I am only measuring 14,722
> (stable) on Pin1.
>
The voltage in pin 1 is up to you. The spec says you need to supply
anything in the range of 15V to 18V. I've been using about 16V from a
variable bench type power supply.
3) Could this low input voltage affect output voltage?
>
I was thinking the same thing. I you sure you are looking at the correct
pin? I noticed a very low signal on pin-6.
The box locks after a couple of minutes but my TDS 210 is showing a very
> jittery ( 9,98-10,02 MHz ) but well formed sine wave for 8 hours of being
> powered on. Could this also be an artefact of low main power?
>
Could be your counter has trouble with low amplitude sine wave. Or it is
loading the signal. My HP counter has trouble with mV level signals too.
But I found my scope has a vertical amp output. Makes the scope work like
an RF amp
-- .
Chris Albertson
Redondo Beach, California
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