Dear BM2CAJ,
The HP8753E measurement for attenuator are shown(import and display with VNWA software)
1. Attenuator in 0/-20/-40/-60/-80/-110 dB
2. Attenuator in 0/-20/-40/-60/-80/-110 dB with data smooth average(same dataset as above)
It reflects some some information here
1. In the lower attenuation test, the measurement difference is below about 1dB
2. In the higher attenuation test(attenuator set to 110db), the measurement difference is quite large and the signal is fluctuated
3. With smooth average the measured data, the measurement difference is narrow down, but it also lost the detail of the result.
I am quite impressed the KC901H to get the -120dB attenuator measurement. The isolation for cable, connector and PCB board will not reach that level easily. Maybe it can also do good as a SDR frontend!!
73,
de bx3aaq
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本帖最後由 bx3aaq 於 2013-1-27 19:02 編輯 ]