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Relay Life and Preventive Maintenance
The DAQ970A/DAQ973A Relay Maintenance System automatically counts the cycles on each relay in the instrument
and stores the total count in nonvolatile memory on each switch module. Use this feature to track relay failures and
predict system maintenance requirements.
Relays are electromechanical devices which are subject to wear-out failure modes. The life of a relay, or the number
of actual operations before failure, is dependent upon how it is used – applied load, switching frequency, and
environment.
You can use the graphs shown in this section to estimate relay lifetimes for your application. Additional background
information is also provided to give you a better understanding of relay wear-out mechanisms. In general, relay
lifetimes depend heavily upon the signals that are being switched and the types of measurements being performed.
– Switching typical signal levels will result in relay lifetimes from 1,000,000 to 10,000,000 operations.
– High-power switching (>25% rating) or high-voltage switching (>100 V) applications will yield relay lifetimes
from 100,000 to 1,000,000 operations.
– Low-voltage switching (<25% rating) and low-current switching (<10 mA) applications will yield relay life-
times to 10,000,000 operations.
– RF switching applications seldom exhibit relay lifetimes exceeding 1,000,000 operations due to more strin-
gent constant resistance requirements (typically less than 0.2 Ω).
The following table shows the time required to reach the specified number of switch operations for several switching
speeds.
Continuous switching speed
1 / hour
1/ minute
1 / second
10 / second
Keysight DAQ970A/DAQ973A User's Guide
Switching operations
100,000
12 years
10 weeks
1 day
3 hours
4 Measurement Tutorials
1,000,000
N/A
2 years
12 days
1 day
10,000,000
N/A
N/A
4 months
12 days
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