Multiple input scopes usually display the channels (inputs) on the
same screen by chopping the time base for dividing the time among the
inputs being displayed. You can usually see this effect when you turn
the sweep to the fastest rate. That's why there is an issue when
using a scope near the top end of its sweep rate.
Another method is to take turns with each channel. So instead of
chopping the entire time of a screen sweep into itty bitty pieces,
the entire sweep is made for channel 1 then the second sweep is
displayed for channel 2. etc. That avoids the choppy appearance when
using sweep rates near the top end. However, when zooming in on the
time domain, you usually want to compare the channels displaying the
same time frame instead of with time delays between each channel.
Everything is a trade-off in engineering.
Alan Kilgore, CPBE
WRVM Chief Engineer
At 03:00 PM 12/11/2017, you wrote:
More expensive one sure looked like 4 inputs but they must be
switched or something ?
From: Russ Hines [mailto:firstname.lastname@example.org]
That's true, and I believe that's the case with both the Siglent and
the Instek mentioned. So if you really need a hyper-critical piece
of test equipment, maybe these aren't the 'droids you're looking
for. But as a general troubleshooting aid, I've found the Siglent to
be just dandy.
JMS & Associates, Inc.
Reply to: email@example.com
On 12/11/2017 13:01, Nathaniel Steele wrote:
Some of those low end scopes share thatvresolution amongst all
channels. So 1GS/s on one channel but 500MS/s if using two and 250
MS/s using 4.....
Not sure about either of those scopes in particular but it is
something to watch out for.