Chapter 2
Using the SCXI-119X
©
National Instruments Corporation
2-3
SCXI-1190/1191/1192 User Manual
Figure 2-2 illustrates the key functional components of the SCXI-1192
relay module.
Figure 2-2.
SCXI-1192 Module Block Diagram
RF Switching Precautions
The SCXI-119
X
are
reflective switches
, meaning that any channels not
switched to the common channel are unterminated, and any signal on an
unterminated channel is reflected to its source. For most low-power
switching applications, this reflection is not a problem. However, operation
with an unterminated output can damage some high-power RF sources.
Consult your RF source documentation for more information about
connecting to unterminated channels.
Warning
Do
not
exceed the channel-to-ground rating of 24 V
rms
or DC on the SCXI-1190,
30 V
rms
or DC for the SCXI-1191, or 30 V
rms
or DC for the SCXI-1192. Any connections
that exceed the maximum voltage for the SCXI-119
X
can result in an electrical shock
hazard and damage to the switch module and any or all of the modules connected to the
SCXIbus
NC0
com0
NO0
NC1
com1
NO1
NC2
com2
NO2
NC3
com3
NO3
NC4
com4
NO4
NC5
com5
NO5
NC6
com6
NO6
NC7
com7
NO7
Relay Controller
Rear Signal
Connector
