[time-nuts] OT favorite signal generator?

John Miles jmiles at pop.net
Fri Jun 19 09:57:19 EDT 2009


No distortion at low levels will occur with any signal generator worth
owning.  Nothing from HP will do that.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of optomatic at rogers.com
> Sent: Friday, June 19, 2009 6:39 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] OT favorite signal generator?
>
>
> 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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>





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