On Wed, Dec 28, 2011 at 11:14 PM, mike cook <michael.c...@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.