Idiomas disponibles
Idiomas disponibles
4 Measurement Tutorials
Relay life
As a relay is used, the contacts begin to wear and the resistance of the closed contacts increases. The initial contact
resistance of a relay is typically 50 mΩ (plus lead resistance). When the contact resistance exceeds 20 to 50 times its
initial value, the contact resistance becomes very erratic and the relay should probably be replaced. For most
applications, a relay with contact resistance greater than 1 Ω should be replaced. The graph below shows the typical
contact resistance characteristics of the relays used on the DAQ970A/DAQ973A switching modules.
Relay load
For most applications, the load switched by the relay is the most important factor affecting relay life. As shown in the
graph below, relay life is maximized by switching low power. As the power switched increases, relay life deteriorates.
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Keysight DAQ970A/DAQ973A User's Guide
