Azelio wrote:
Usually the external reference input of measuring equipment is internally squared, so if you feed a square or sine wave there should be no difference.
Some external reference inputs may be DC coupled and zero-switching, in which case unipolar logic levels will not work well. I don't know of any specific equipment to which this may apply, but if you try it and it doesn't work well it is one thing to consider. An external coupling cap (or AC coupling the output internal to divider) should fix it.
Also, 74AC logic level (~ 5 Vpp) may be a little hot for some reference inputs. Many reference inputs present a load impedance higher than 50 ohms to the source (often ~ 1k ohm), so you may not get the divide-by-2 attenuation from the open-circuit voltage that you expect in a matched system. In this case, an external 50 ohm termination will reduce the level to ~ 2.5 Vpp.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
