R&S OSP
Applications
Operating Manual 1505.3896.12 - 14
183
8.4 Application of Module R&S OSP-B103
The module R&S OSP-B103 with 16 input/output ports can be used to connect
additional relays to the R&S OSP.
The following application applies to EMI systems measuring the Radiated Spurious
Emission of mobile phones and other equipment. These EMI systems need a series of
notch filters to be switched during the measurement. Depending on the design of the
system and due to the size of the notch filters, the relays are mounted close to the
notch filters to keep the cable loss low. The module R&S OSP-B103 can be used to
control these “remote relays” via the R&S OSP. The following chapter gives an
example for such a solution.
The below example is shown for a maximum configuration. Check the R&S OSP-B103
version for maximum output current!
8.4.1 Controlling External Relays with R&S OSP-B103
The module R&S OSP-B103 has 16 output lines and 28 V DC power supply. The
output lines are open drain type and are switched to GND when activated.
The following table gives a short specification and recommendation of the preferred
relay type to be used with the R&S OSP-B103.
Switch
type
Max.
Freq.
Coil voltage / current
Relay type
Recommended
SPDT
18 GHz
24 .. 28 V DC / max 200 mA
failsafe
Radiall 570 413 000
SP6T
18 GHz
24 .. 28 V DC / max 200 mA
(positive common terminal)
failsafe
Radiall 583 403 200
SPDT
40 GHz
24 .. 28 V DC / max 200 mA
failsafe
Radiall 571 813 200
SP6T
40 GHz
24 .. 28 V DC / max 200 mA
(positive common terminal)
failsafe
Radiall 573 803 610
The connection of the relays is done as shown in the block diagram below.
