Agilent Technologies U1251A User's And Service Manual page 147

Performance Tests and Calibration 7
Successful completion of each adjustment value, the
secondary display briefly showing PASS. An adjustment
failure is sounded by a long beep and calibration error
number appears in the secondary display. The primary
display remains at the current Cal Item. Check the input
value, range, function, and entered adjustment value to fix
the problem and repeat the adjustment steps.
9 Repeat steps 1 through 8 for each adjustment point.
10 Verify the adjustments using the
"Performance Verification
Tests" on page 130.
Agilent U1251A/U1252A User's and Service Guide 147