[time-nuts] OT favorite signal generator?

optomatic at rogers.com optomatic at rogers.com
Fri Jun 19 09:38:46 EDT 2009


Hey Robert

Great tip about the attenuator.

I looked up some models on the internet and some look fairly expensive. 
I know that I will always be injecting low voltage signals, do you think 
it would be wise to buy a cheaper fixed attenuator, let's say 20dB?, and 
then just depend on the variable rate that the signal generator?

Thanks-Patrick

Robert Darlington wrote:
> I just bought an HP 3325A synthesizer/function generator that I really like
> (for some things anyway) in about that price range.   What you get is
> probably dependent on what YOU need though.  This thing is pretty limited
> but this particular one has the high voltage option so the output goes up to
> 40 volts up to 1MHz.   It only goes to 20.99999999 Mhz (at up to 10V I
> think) but for 99% of what I do that's just fine.  It has a 10MHz external
> reference which I hook to either an Rb osc or a Thunderbolt depending on
> what I'm doing.  It's pretty neat to see all the digits match between the
> 3325A and the 5335A counter.  Of course, that's being clocked by the same
> oscillator too.
>
> Also, I noticed on some signal generators, dropping the output down to a few
> mV distorts the signal.  What I learned to do was send my signal out at
> about 1 volt ((RMS or p2p, doesn't matter) and go through a step attenuator
> to drop it back down so it comes out clean.
>
> -Bob, N3XKB
>
> On Fri, Jun 19, 2009 at 6:04 AM, Patrick <optomatic at rogers.com> wrote:
>
>   
>> Hey everyone
>>
>> Sorry for the off topic post. I have received great advice in the past
>> with items for my little shop and I can't resist to ask again.
>>
>> I am thinking about buying a signal generator. I suspect that I will
>> mostly use it to inject low uV/mV signals into the amplification stages
>> of the laboratory instruments I service.
>>
>> Any feedback you have would be greatly appreciated-Patrick
>>
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