Average safe reverse power Total : 30 dBm (1 W)
Maximum safe reverse level Voltage: ±50 VDC
How any ordinary antenna we might sweep might exceed these levels is unclear.
Antenna measurement was just an example.
I don't think the 30 dBm rating applies to port 1. It does, for a brief time and -I believe- with at least 20 dB internal attenuation inserted, for port 2 (SA port).
Average safe reverse power Total : 30 dBm (1 W)
Maximum safe reverse level Voltage: ±50 VDC
How any ordinary antenna we might sweep might exceed these levels is unclear.
Antenna measurement was just an example.
I don't think the 30 dBm rating applies to port 1.
RTFM/datasheet.
Port 1 is the TG port however in VNA mode the reflection path is protected by the internal bridge just like how Port 2 (RF In) is protected when using an external bridge that provides additional attenuation when in SA mode.
Isolation for Port 1 is from the internal bridge of which we only have the TG reverse spec to work from which the internal bridge is identified shortly after Dave did the teardown early in this thread.
You could look that up and study its datasheet for its reverse voltage and attenuation spec of which Siglent has worked within so to provide the TG spec common to all these SVA/SSA designs.
Common sense would have Siglent null internal bridge attenuation from measurements to some degree so not to have uncalibrated measurements far off the display.
It does, for a brief time and -I believe- with at least 20 dB internal attenuation inserted, for port 2 (SA port).
Port 2 (RF In) has more defined specs as expected and in SA and adjustable attenuation: 0 ~ 50 dB
Maximum input DC voltage +/- 50 VDC
Maximum average power 30 dBm, 3 minutes, fc ≥10 MHz, att > 20 dBm, preamp off
Maximum damage level 33 dBm, fc ≥ 10 MHz, att > 20 dBm, preamp off
Have you ever tripped the RF In warning buzzer ?