Keysight N432A Programming Manual page 252

5 CALibration Subsystem
Error messages
– If CAL:ZERO:AUTO is set to ON and an incompatible sensor is connected, error
– If zeroing was not carried out successfully, error –231,"Data Questionable;
– If there is no sensor connected, error –241,"Hardware missing" occurs.
252
–241,"Hardware missing" occurs.
ZERO ERROR" occurs.
Keysight N432A Programming Guide