power(dBm) of TG44A in Scalar Network Analysis-mode?

Qswitch,

If you use “high dynamic range” scalar network analysis, the output power is both -10 dBm and -30 dBm in both cases. The damage level for the SA44B is +20 dBm regardless of attenuator setting (it could probably handle a bit more if the attenuator was set to 10-15 dB), but you can’t accurately measure signals above +10 dBm.

For passive high dynamic range, the pair of settings used is -30 dBm TG & -30 dBm SA (to 0 dB insertion loss), and -10 dBm TG & -50 dBm SA (for >40 dB insertion loss)

For “active” measurements, the SA reference level is moved up 20 dB I believe. The included 20 dB pad can be used to measure up to 40 dB of gain. To measure more gain than this, additional attenuation would be required.
If you are measuring an amplifier capable of more than +20 dBm output, I recommend using the 20 dB external attenuator. Or, more specifically, use enough attenuation so that if your amplifier saturates, it won’t blow the SA44B.

You are correct that scalar network analysis units should be dB, not dBm, but our software’s control panel (at least when the manual was written) required you to enter a dBm reference level, and used this as dB. This may have been fixed since then.