Russ wrote:
The HP 5334B has a 1k Ohm input impedance shunted by <20 pf it wouldn't hurt to terminate this input
This is pretty typical for reference inputs on test equipment. The idea is that one 50 ohm source can feed a number of instruments using nothing but a series of Tee connectors, with the far end of the cable terminated in 50 ohms. The 1k loads will cause little disturbance on the 50 ohm line.
If best isolation and delay matching are required, the source should feed a good DA and there should be equal-length runs of coax from the DA to each instrument, with proper terminations. Generally, this is required only for measurement inputs -- it is rarely necessary for the references of different instruments to be phase coherent (and different instruments are likely to have quite different internal reference delays).
Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
