Application Examples
R&S
®
OSP
234
User Manual 1178.7100.02 ─ 05
If the interlock loop is closed, an internal relay bridges the pins 8 and 14 of the [IN /
OUT] connector. Connect these pins to your power amplifier's interlock input. If the
interlock-monitored door is opened, or if a power relay is turning (hence, not being in a
safe position), this circuit shuts down RF power.
Refer to your application software's documentation for details on interlock control.
6.2.3
Input Ports of R&S
OSP-B104
The module's dialog in the firmware and the SCPI command
can dis-
play and query the state of the input channels at any time.
The input ports of the module R&S
OSP-B104 are designed for LVC (Low Voltage
CMOS) logic, but can be operated with TTL level up to 5
V, as well.
Control circuits like the interlock loop in typical EMS test systems often use control vol-
tages up to 28
V
DC. You can connect the R&S
OSP-B104 inputs to circuits with up to
28
V, if you observe the following point:
Do not
overload
the input: for voltages >
5
V
DC up to 28
V
DC, insert a
22
k
Ω
resis-
tor, see
Chapter 2.1.11, "Connecting Control Cables"
Each input channel is protected by a lowpass filter and two TVS diodes against transi-
ent disturbances.
6.2.4
Output Ports of R&S
OSP-B104
Each output channel is designed as a MOS-FET (open drain) that leaves the channel's
pin on high impedance in the inactive state. When activated, the FET switches the pin
to internal ground. Each output is protected by two TVS diodes against transient distur-
bances, which can occur when switching inductive loads such as relay coils.
Output current limits
●
The output ports can draw a maximum of 200
mA, each.
●
The R&S
OSP can supply a maximum current of 600
mA to all OUT ports together.
●
The maximum total current for all slots in the switch unit is 10
A.
A typical application of these output ports is switching a lamp to indicate the state of an
EMS measurement. For example, the lamp can illuminate a sign "Test in progress". If
the lamp uses common 110
V or 230
V mains voltage, you must switch the power sup-
ply with an additional relay.
Applications of Module R&S
OSP-B104