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Rigol DSO useful bandwidth ?

** Hi to all,

that "dumped" Rigol DSO continues to exceed my expectations.

The latest surprise came about when I investigated a high level of noise in the trace at high gain settings - not inherent in the DSO mind you, but only when attached to other devices on my bench.

Soon found several mV of RF signal being picked up around 98 to 100 MHz - with the time base set to 20nS the counter function locked onto it reasonably well.

A check with a radio scanner turned up a very strong signal on 98.5 MHz from "2000FM" - broadcasting from the Optus Tower in North Sydney with 25 kW of ( ERP ?) power.

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( The mono music program was of telephone quality - how can they get away with that ? )

I tried the FFT function and the DSO presented a nice plot of the VHF radio spectrum - clearly showing ABC2's carrier on 64 MHz and extending right through and beyond the FM band.

When a 12MHz square wave oscillator module was tried, it clearly showed odd harmonics right up to the 11th and maybe 13th.

That's 156 MHz !!

Anyone got a VHF gen to see what the real limit is ??

.... Phil

Reply to
Phil Allison
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"Phil Allison"

** Done that myself now.

  1. The upper limit of the "counter" function of my DS1052E is 264.25 MHz.

  2. The upper limit of a viewable, synchronised wave is circa 400MHz.

  1. The FFT works to beyond 260 MHz, but beware of frequency aliasing.

  2. The digital filter works as shown on the screen guides.

Not too shabby for cheap, nominal 50MHz scope..............

.... Phil

Reply to
Phil Allison

Very interesting, thanks for sharing Phil. Someone on my EEVblog forum posted a measured frequency response of the DS1052E, as measured by the on-screen signal level measurement readout function.

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Dave.

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Reply to
David L. Jones

"David L. Jones" <

** That claim makes no sense.

The on screen ( rms etc) voltage readout relies on the sampled data points.

... Phil

Reply to
Phil Allison

Presumably with decreased vertical amplitude. Any idea how much? On a

50Mhz scope I would think it's quite a bit.
Reply to
JW

I recently had the opportunity to check out a Rigol DS1204B scope.

I've posted some measurements on alt.binaries.schematics.electronic.

Reply to
The Phantom

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