Idiomas disponibles
Idiomas disponibles
Switching frequency
Relay contacts heat up as they switch significant power. The heat is dissipated through the leads and the body of the
relay. As you increase the switching frequency to near its maximum, heat cannot dissipate before the next cycle. The
contact temperature rises and the life of the relay is reduced.
Replacement strategy
There are essentially two strategies that you can use for preventive maintenance of the relays on the switching
modules. The strategy that you choose depends upon your application, the consequences of a relay failure in your
system, and the number of relay cycles during a measurement session.
The first strategy is to replace each relay as needed after it fails or becomes erratic. This is suitable if you are
switching higher loads on only a few relays on the module. The disadvantage of this strategy is the inconvenience of
continually replacing relays as they near the end of their life at different times.
The second strategy is to replace all relays on the module or simply purchase a new module as the relays near the
end of their life. This strategy is best suited for those applications where all relays on the module are switching
similar loads. The failure of several relays over a relatively short period of time may indicate impending failures on
other relays switching similar loads. This strategy decreases the risk of failure during actual use at the expense of
replacing some relays that may have useful life remaining.
For switching frequency and replacement strategy as described above, you can use the DAQ970A/DAQ973A
Relay Maintenance System to track and even predict relay failures.
Keysight DAQ970A/DAQ973A User's Guide
4 Measurement Tutorials
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