Re: Oscilloscope Shopping on a $2000.00 Budget

John Larkin wrote:
On Mon, 08 Oct 2007 00:39:08 GMT, Jamie Morken <jmorken@xxxxxxx>
wrote:

John Larkin wrote:
On Sat, 06 Oct 2007 12:59:28 -0700, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

D from BC wrote:

I want a scope for Christmas :)
I have a $2000.00CAD (including expenses) budget for a new or used
oscilloscope.
I tend to do smps and uC projects.

Very different ballgames. SMPS mostly needs a good analog scope, ...
Why? I do just fine with a digital, and the infinite persistance and
measurements can be very useful, even for switchers.

Really, an analog scope is a primitive, almost qualitative instrument.

The really spiffy one for switchmode and power amps is the Tek with
true floating inputs. Just slap that probe g-s onto the highside
switching fet!
Are the floating inputs in the probes or in the scope? I am working on
a SMPS with uC control and don't have a scope yet, figure I better get
one so I am in the market too!

In the scope itself. I'm not sure, but I think they use GHz-range FM
to couple the signal from the floating input stage to
ground-referenced. It comes with special safety-rated probes (no
exposed metal) but any probes, or no probes, work fine. TPS2000
series, starts around $2500, not bad if you consider what isolation
probes cost.

So if you have a scope without the true floating inputs, how do you measure a high side switching fet in that case?

cheers,
Jamie



John


.

Relevant Pages

  • Re: Oscilloscope Shopping on a $2000.00 Budget
    ... SMPS mostly needs a good analog scope, ... Really, an analog scope is a primitive, almost qualitative instrument. ... Are the floating inputs in the probes or in the scope? ...
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  • Re: Oscilloscope Shopping on a $2000.00 Budget
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