Keysight Technologies L4490A, Руководство пользователя

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142 Keysight L4490A/L4491A User’s Guide
Additional Operating Information Using Dual-Coil Switches and Attenuators
The schematic shown is similar to the Keysight 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.
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