14
Agilent 8710x Operating and Service Manual
2
Switch Configuration
TTL Drive (Option T24)
1
Connect pin 1 to supply voltage (+20 Vdc to +32 Vdc) and pin
15 to ground.
2
Select (close) desired RF path by applying TTL “High” to the
corresponding “drive” pin; for example apply TTL “High” to pin
3 to close RF path 1.
3
To select another RF path, ensure that all unwanted RF path
“drive” pins are at TTL “Low” (to prevent multiple RF path
engagement). Apply TTL “High” to the “drive” pin which
corresponds to the desired RF path.
4
To open all RF paths, ensure that all RF path “drive” pins are
at TTL “Low”. Then, apply TTL “High” to pin. This feature is not
available in option 100.
N O T E
Pin 15 must always be connected to ground to enable the electronic
position-indicating circuitry and drive logic circuitry.
In addition to the quiescent current supplying the electronic position-sensing
circuitry, the drive current flows out of pin 15 (during switching) on TTL drive
switches (option T24).
C A U T I O N
If pin 15 is not connected to power supply ground, catastrophic failure will
occur.
N O T E
After the RF path is switched and latched, the drive current is interupted by the
electronic position-sensing circuitry.Pulsed control is not necessary, but if
implemented, the pulse width must be 15 ms minimum to ensure the switch is
fully latched.
87104-90001.book Page 14 Thursday, August 30, 2007 3:49 PM
