Agilent Technologies L4400 manual Paired Drive With Separate Position Indicators

Microwave Switch/Attenuator Driver 7

Paired Drive With Separate Position Indicators

The simplified schematic below illustrates the connection for a dual drive switch with separate position indicators. The position indicators for this type of switch are independent relay contacts that are mechanically linked to the RF switch position.

The RF paths are not shown in the simplified diagram. The coils are driven in open collector mode. The position indicator is set so that a high level indicates an active switch. The logic level of the position indicator can be inverted using the ROUTe:CHANnel:VERify:POLarity command.

As shown, Channel 01 was pulsed to close Coil A. The corresponding position indicator also closed. Closing position indicator A opens position indicator B.

The schematic shown is similar to the Agilent N181x series of switches.

34945EXT	Y1155A	Switch
	Distribution
Logic Gate	Board
Sense	IND 11
	IND 1
Pull Down
Resistor		A	B
	+VI
	+VR
		Coil A	Coil B
Open Collector
Output Drivers	DRV 1
	DRV 11
L4400 User’s Guide			185