Agilent Technologies 34945A, Руководство пользователя

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104 Agilent 34945A Microwave Switch/Attenuator Driver Module User’s Guide
5
Additional Operating Information
The schematic shown is similar to the Agilent N181x series of switches.
Figure 5-4. Dual-Coil Switch Connection Diagram (separate position indicators).
Paired Drive With Combined Position Indicators
The simplified schematic below illustrates the connection for a dual drive
switch with an integral position indicator. The position indicators for this type
of switch are electrically connected to the device’s drive coil. This is a typical
arrangement for microwave attenuators. For these types of position indicators,
you must make a parallel connection at the distribution board between the
channel drive and the indicator input.
With these types of devices, positive voltage is present on the paired coil
opposite the position the switch is currently in. Typically you will need to
invert the logic level of the position indicator using the
ROUTe:CHANnel:VERify:POLarity
command.
As shown, Channel 01 was pulsed to close Port 1. The corresponding position
indicator also closed.
34945EXT Y1155A
Distribution
Board Switch
IND 11
IND 1
+VI
+VR
DRV 1
DRV 11
Open Collector
Output Drivers
Logic Gate
Sense
Pull Down
Resistor
A
B
Coil A
Coil B