Operating Manual 1505.3896.12 - 14 192
R&S OSP-B114 signal generator switching
This function only is used if the used Power Amplifiers have no Interlock Security Loop
as described in the next chapter.
The relay is controlled by the Interlock loop. In case the interlock loop is open, the
relay is inactive and the signal generator is separated from the Power Amplifier input.
The Power Amplifier input itself is terminated by 50 ohms via the relay. See attached
diagram for details.
Figure 8-7: Switching of Signal Generator with Module R&S OSP-B114
8.6.2 Interlock Circuitry with the R&S OSP-B114 Module
To setup an EMS system with Interlock functionality, the module R&S OSP-B114
offers the following features:
Interlock Loop:
Between Pin 6 (+ 28V) and Pin 2 (INTLK Loop) of the 9-Pin Sub-D connector IN a loop
is wired which contains a door contact. If the door is closed, the lnterlock loop is closed
and Power Amplifiers can be operated.
Interlock Output:
There are two floating contacts which are closed with Interlock Loop closed. These
contacts are connected to the Power Amplifiers. Most of the Power Amplifiers have got
aa Interlock Safety Loop: two contacts have to be bridged to allow the Power amplifier
to be switeched to Operate Mode.
Interlock LED:
The INTLK LED on the OSP-B114 front panel is OFF as long as the Interlock Loop is
closed. As soon as the Interlock Loop is opened, the LED is switched ON (red light).
There is a possibility to connect an external LED (low power LED with about 10 mA
current) on of the 9-Pin Sub-D connector OUT according to the following diagram. The
resistor for LED current limitation is part of the R&S OSP-B114 module.
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