[sdiy] Owon scope oddity...

[Justin Owen]

Hi Robin,

Yes - that's it.

Probe setting needs to be set at 1x to get down to 5mV/div - (x10 = 50.0mv, x100 = 500mV, etc)...

however that apparently limits the scope's bandwidth from 25MHz to 5MHz.

Thanks for the reply.

Justin

-----Original Message-----
From: Robin Whittle [rw at firstpr.com.au]
Received: 03.04.2012 13:04:44
To: SDIY List
Cc: Justin Owen
Subject: Re: [sdiy] Owon scope oddity...

Hi Justin,

The most likely explanation is that you are using a divide by 10 probe.

Divide by 10 probes are widely used because they place on the system you
are testing a DC load of 10 Meg ohms rather than the scope's normal 1
Meg ohm impedance.  Capacitance is also reduced by about a factor of 10.

  - Robin


> I was hoping any of you that own one of the Owon scope range could
> help me clarify something.
> 
> I own the PDS5022S. The specs state that the vertical division scale
> is 5mV/div to 5V/div - but my scope is showing 50.0mv to 50V.
> 
> I've asked Rapid to look into this to see whether it's a typo in the
> manual, something specific to my (lower end) model - or something
> else - but I was hoping maybe one of you who own one of these scopes
> might also be able to have a look at what your screen was telling you?
> 
> Thanks,
> 
> Justin