Rohde and Schwarz ZVA40.43

B16	Direct Generator/Receiver Access for 2-port ZVA40
B21	Generator Step Attenuator Port 1; mechanical, 70dB in 10dB-steps, 40GHz
B22	Generator Step Attenuator Port 2; mechanical, 70dB in 10dB-steps, 40GHz
B31	Receiver Step Attenuator Port 1; mechanical, 35dB in 5dB-steps, 40GHz
B32	Receiver Step Attenuator Port 2; mechanical, 35dB in 5dB-steps, 40GHz
B7	Measurements on pulsed signals. Pulse profile,Recording time up to 25ms, up to 30MHz bandwidth
DCV-2	Documentation of calibration values
K17	Increases the receiver bandwidth to 5MHz
K27	Two internal pulse generators (for ZVA and ZVT)
K4	Frequency converting measurement for ZVA and ZVT
K5	Phase measurement on mixers (for ZVA, ZVT; ZVA/T-B16 and ZVA-K4 required)
K7	Measurements on pulsed signals pulse profile, recording time up to 3ms up to 30 MHz bandwidth
K8	Control of frequency converters (for ZVA with f>20 GHz, ZVT20, includes ZVA-K4)
K9	Measurement of group delay on frequency converters without LO access (for ZVA, ZVT;
ZVAB-B18	Removable Flash Disc for ZVA/ZVB with controller unit FMR7/3 or FMR7/6
ZVAB-B4	Oven quartz (OCXO) for ZVA, ZVB, ZVT
ZVAB-K2	Time domain (for ZVA, ZVB, ZVT)
ZVAB-K30	Noise figure measurement on linear and frequency converting 2 port devices (for ZVA, ZBV and ZVT,