Re: Tek 2445 for TDS 1002?
- From: nico@xxxxxxxxxxx (Nico Coesel)
- Date: Wed, 03 May 2006 19:07:37 GMT
"Phil Allison" <philallison@xxxxxxxxxx> wrote:
"Paul Mathews"
A lot of the opinions you'll read are based on experiences with
sampling rates of a few 10s of MHz, where aliasing can be a real
problem.
** Really ?
The TDS 1002 scope is virtually the same as the TDS 210 that I "road
tested".
Ailiasing is a major problem despite the advertised 1 GS/s spec.
The reason is simple and given in the operator's manual.
When set for 5 milliseconds per division, the actual sampling rate is only
50kS/s.
So ailiasing starts at 25 kHz.
Big problem.
Yes indeed, it sounds plain stupid to build an oscilloscope that way.
Is Tektronix cutting corners? Nowadays you can expect a digital
oscilloscope to have enough memory to store at least 1M points so
lowering the sampling rate only occurs at very low time/div. settings
(which should change the anti-aliasing filter accordingly). IIRC the
54 series HP / Agilent oscilloscopes work that way.
--
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