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Band width of a 100MHz scope is greater than of a 200MHz

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Band width of a 100MHz scope is greater than of a 200MHz

Postby egonotto » Fri Dec 15, 2017 11:41 pm

Hello,

why is the band width of my PicoScope 100MHz 5234A greater than the band width of the PicoScope 200MHz 5444B?

The pictures show the same signal with same BNC cable with 50 Ohm terminator.

The rise time of the 100MHz scope is slightly faster than the rise time of the 200MHz scope.

Best regards
egonotto
Attachments
5444B._rise.jpg
5243A._rise.jpg
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Re: Band width of a 100MHz scope is greater than of a 200MHz

Postby Martyn » Mon Dec 18, 2017 9:13 am

We would like to do some testing on units here, so can you post a psdata file, we will then have the exact setup you have, and confirm that you are using the signal generator to generate a 1MHz square wave as your input signal.
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Re: Band width of a 100MHz scope is greater than of a 200MHz

Postby egonotto » Mon Dec 18, 2017 5:09 pm

Hello,

I use the signal generator of the 5444B for input to a Rigol DS2072.
The trigger output of the DS2072 has a rise time near 1ns.
This output is the input for the 5444B and 5243A.
I connect alternative the 5444B and 5243A. So they got the same signal
The signal has a 50Ohm termination.

I also feed the 5444B and 5243A with the output of a tracking generator with 300 MHz.
The same signal for the 5444B and 5243A.

One see that the band width of the 100MHz 5243A is about the same as the band width of the 200MHz 5444B.

Best regards
egonotto
Attachments
risetime-PS5444B.psdata
(10.43 KiB) Downloaded 31 times
risetime-PS5243A.psdata
(9.67 KiB) Downloaded 21 times
300MHz-PS5444B.psdata
(10.8 KiB) Downloaded 16 times
300MHz-PS4243A.psdata
(11.03 KiB) Downloaded 40 times
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Re: Band width of a 100MHz scope is greater than of a 200MHz

Postby Martyn » Wed Dec 20, 2017 1:02 pm

Thank you for the information, I will check through this when back in the office tomorrow.
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