Chapter2 Usingthe SCXI-119X
©NationalInstruments Corporation 2-3 SCXI-1190/1191/1192User Manual
Figure 2-2 illustrates the keyfunction al components of the SCXI-1192
relay module.
Figure2-2. SCXI-1192Module Block Diagram
RF Switching Precautions
The SCXI-119Xare reflective switches, meaning that any channels not
switched to thecommon channel are unterminated, and any signal on an
unterminated channel is reflected to its source. For most low-power
switchingapplications, 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 Donot exceed the channel-to-ground rating of 24 Vrms or DC on the SCXI-1190,
30 Vrmsor DC for the SCXI-1191, or 30 V rms or DC for the SCXI-1192. Any connections
thatexceed the maximum voltage for the SCXI-119Xcan result in an electrical shock
hazard and damageto the switch m odule and anyor all of the modules connected to the
SCXIbus
NC0com0 NO0 NC1com1 NO1 NC2com2 NO2 NC3com3 NO3 NC4com4 NO4 NC5com5 NO5 NC6com6 NO6 NC7com7 NO7
RelayController
RearSignal
Connector