Risetime of PCSGU250

Instruments PC Oscilloscopes and Recorders
1

Hello
Im looking at PCSGU250 to use for hoppy projects, but Im a bit confused about what I can measure. Would you be so kind to confirm/correct the following?

Accordantly to:
viewtopic.php?f=10&t=3811&p=13107&hilit=PCSGU250#p13107
The testprope have a risetime of 5.8ns while the osc have a risetime of 23.3ns. Does this mean that I can measure risetimes down to: 5.8+23.3 = 29.1 (30ns)?

I was told that as a rule of thumb, Bandwidth->measureable risetime could be calculated by: 0,35/BandWidth, with 12MHz bandwidth, this gives: 29,16ns… so… this also suggests the 30ns, but am I correct?

Kind Regards
Brian

2

They are not additive.

However the probe rise time (or bandwidth) should be at least 3 times that of the scope input. At 5.8ns the probe bandwidth is 60Mhz (0.35/0.0000000058), more than enough to handle the scope’s 12Mhz capability–I.e. the scope’s rise time is the limiting factor…

3

Hello
Thank you for your reply :slight_smile:

Is the 0,35/BandWidth = ~30ns risetime correct?

4

[quote=“FatMoose”]Hello
Thank you for your reply :slight_smile:

Is the 0,35/BandWidth = ~30ns risetime correct?[/quote]

It is the generally used model, this is [color=#4040FF]a very good document concerning band width[/color], from Tektronics.