neil.johnson
Well-known member
1) You're calibrating it, so rules of thumb (educated short cuts) do not apply.
2) What's the highest frequency of a 2 MHz square wave?
50 Ohm BNC termination
- Thread starter warpie
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2) What's the highest frequency of a 2 MHz square wave?
If the SKU has 50 ohm source impedance and expects a 50 ohm load termination that will cause a 6 dB drop in level. Calibrating without the proper load/termination will not deliver correct level.
JR
JR
so
New member
Because that becomes part of the output circuit and affects the output voltage; their specified O/P impedance is apparently 50Ω.
Because the level depends on the load impedance. For equal source and load Z, the signal is attenuated 6dB.
It's important for level calibration, although the frequency response would be correct even with a large mismatch.
Unterminated connection is OK (insignificant SWR) for a short cable at 2 MHz but puts a different level out. Calibration is about precision.
Theoretically (in classical terms - I'm not even going to try getting into quantum issues
) the highest frequency is infinite. Odd Harmonics at an even decreasing amplitude.But, of course, in physical terms. there is no such thing as a perfect square wave
Ideally they are rise time limited with a small enough rise time to be inconsequential.
Rise time limiting is better than slew limiting IMO.
JR
Rise time limiting is better than slew limiting IMO.
JR
