Products > Test Equipment
Bandwidth check of my oscilloscope with simple means ?
Frank_MV:
Thank you for all your contributions, I will read everything at my leisure.
Background: I have upgraded my RTB2004 from 70MHz to 100MHz and would like to check if it was successful.
Br,
Frank
Bud:
--- Quote from: Berni on December 11, 2020, 05:19:40 pm --- it is only a 2GHz scope
--- End quote ---
::) :D
David Hess:
As mentioned earlier:
If you use a probe, which is not a bad idea since what really usually matters is the bandwidth at the probe tip, then the connection should be made coaxially to the probe tip without the ground lead.
Leo Bodnar's pulse generator is an inexpensive source for suitable fast edges:
http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=295
Also:
Another source for clean and fast edges is the horizontal and vertical sync outputs on pins 13 and 14 on a VGA connector.
Berni:
One thing to keep in mind when testing probes like this is that at high frequency the >10pF of probe capacitance starts to really matter and can drag down a 50 Ohm source, but up to 100MHz it's still pretty reasonable.
--- Quote from: Bud on December 11, 2020, 05:42:10 pm ---
--- Quote from: Berni on December 11, 2020, 05:19:40 pm --- it is only a 2GHz scope
--- End quote ---
::) :D
--- End quote ---
Well compared to other Infiniium family scopes it is pretty low.
But mostly was saying in terms of the 3.2GHz measured bandwidth compared to the 2GHz rated bandwidth. If you turn on filtering to get actual 2GHz of bandwidth out of it the ringing goes away.
tggzzz:
--- Quote from: Berni on December 11, 2020, 08:13:23 pm ---One thing to keep in mind when testing probes like this is that at high frequency the >10pF of probe capacitance starts to really matter and can drag down a 50 Ohm source, but up to 100MHz it's still pretty reasonable.
--- End quote ---
15pF at 100MHz is ~100ohms. So much for such a probe being "high impedance 10Mohm"!
A 10:1 " low impedance" resistive divider Z0 probe will be 500ohms input impedance, and have a multi GHz bandwidth.
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