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For indication you will find below the specifications for other PXI type R : PXI 7811R : 1 342 000 hours at 25 °C PXI 7853R : 811 480 hours at 25°C PXI 7831R : 301 262 hours at 25 °C
If i have more informations soon about the 7842R, i will come back to you.
Regards,
Maxime G. | Application Engineer National Instruments France