Goal: measuring three output waves simultaneously.
Equipment: VNA 8510C and VNA 8720ES
My solution and problem: use wave from port 1 of 8510C as source wave. Lead one of output wave to port 2 of 8510C and lead the other two waves to the two ports of 8720ES. Put huge attenuation on power source 2 of 8510C and turn off powers of 8720ES. Directly measure the wave B on port 2 of 8510C and two ports of 8720ES. Is this procedure reasonable? But I meet a problem? The waves shown on 8720ES are not stable. Those two waves on 8720ES should be phase loop locked with the wave A on port 1 of 8510C. How can I achieve that? There is R channel on 8720ES, but how to make connection? Please give me suggestions and show me the procedure in details. Thanks a lot.
Shengyu
Equipment: VNA 8510C and VNA 8720ES
My solution and problem: use wave from port 1 of 8510C as source wave. Lead one of output wave to port 2 of 8510C and lead the other two waves to the two ports of 8720ES. Put huge attenuation on power source 2 of 8510C and turn off powers of 8720ES. Directly measure the wave B on port 2 of 8510C and two ports of 8720ES. Is this procedure reasonable? But I meet a problem? The waves shown on 8720ES are not stable. Those two waves on 8720ES should be phase loop locked with the wave A on port 1 of 8510C. How can I achieve that? There is R channel on 8720ES, but how to make connection? Please give me suggestions and show me the procedure in details. Thanks a lot.
Shengyu
With your setup, you must split the source signal from the 8510 source, send part of it to the R channel of the 8720 (there's a loop on the front panel), then take A/R and B/R to stabilize the phase. You can only do this in a CW mode. And, there will be a problem that the LO driving the down converters in the 8510 will have different phase noise than the down converters in the 8720.
Maybe a better way is to use an 8511 test set and do direct connection to the 8510 samplers. Still another is to remove the loops on the rear of the 8510 and drive the signals into the a1 and a2 receviers directly, then into port 1 and port 2, giving you 4 simultaneous receivers, and don't use the 8720 at all.