Application Examples
R&S
®
OSP
237
User Manual 1178.7100.02 ─ 05
6.3.2
Switching a Signal Generator with R&S
OSP-B114
The module R&S
OSP-B114 has a terminated solid-state SPDT relay with SMA con-
nectors.
Only if your power amplifiers have no interlock security loop, as described in
ter 6.3.3, "Interlock Circuitry with R&S
on page 237, integrate this SPDT
relay into the path from the signal generator to the power amplifier, as in
The relay is controlled by the interlock loop. If the interlock loop is open, the relay is
inactive and the signal generator's output is separated from the power amplifier's input.
In this state, the relay can terminate the power amplifier input with 50
Ω
.
Figure 6-9: R&S
OSP-B114 switches the path from signal generator to power amplifier
6.3.3
Interlock Circuitry with R&S
OSP-B114
For setting up an EMS test system with interlock functionality, the module R&S
OSP-
B114 offers the following features:
●
Interlock monitoring loop
The circuit between pin 6 (+28
V
DC) and pin 2 (interlock loop) of the 9-pin D-Sub
[IN] port connects to your door contact. If the door is closed, the interlock loop is
closed. This logic controls the interlock output.
●
Interlock output
The [IN] and [OUT] ports each have a relay with two floating "PA interlock control"
contacts. If the interlock loop is closed, the relays bridge these contacts, which
connect to the "interlock security loop" ports of up to two power amplifiers. Such
security ports are a feature available in most power amplifiers. The interlock secur-
ity loop must be closed to let your power amplifiers switch to operating mode.
●
Interlock LED
When the interlock loop is closed, the [INTLK] LED on the R&S
OSP-B114 front
panel is off. When the door contact is opened and interrupts the interlock loop, the
LED is turned on and shows red light.
Also, you can connect an external LED to pin 3 and 9 of the 9-pin D-Sub [OUT]
connector according to
. Use a low-power LED that draws a current of
up to 10
mA. A resistor for LED current limitation is already integrated in the
R&S
OSP-B114 module.
Applications of Module R&S
OSP-B114