Keysight Technologies P Series Programming Manual page 670

17 IEEE 488.2 Command Reference
*TST?
The *TST? (TeST) query causes the power meter to perform the self test. The test
takes approximately 30 seconds.
The result of the test is placed in the output queue.
– 0 is returned if the test passes
– 1 if the test fails
Syntax
670
*TST ?
Keysight N8262A Programming Guide