Le 29/12/2011 09:28, Chris Albertson a écrit :
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?
Loaded just by the scope input which I guess is 50ohm. probe is a 1x.
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.
I'm going to rewire the breadboard. I have a Toshiba 3A 15V supply
putting out 15,04. Must be leaking somewhere along the line. I'll see if
I have something with a bit more to spare.
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.
I am looking at the right pin, measuring the voltage with TDS function.
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
-- .
Probable. I tried T-ing to an independent counter and the wave form
dropped near flat.
Thanks for your inputs guys
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