Agilent Technologies N1911A Programming Manual page 242

4 CALibration Subsystem
Query
CALibration[1]|2:ZERO:AUTO?
The query always returns a value of 0.
Error Messages
• If this command is set to ON and an 8480 Series, E- Series or N8480
• If zeroing was not carried out successfully the error –231, "Data
• If there is no sensor connected, the error –241, "Hardware Missing"
• If this command is set to ON and TRIGger[:SEQuence[1]|2]:COUNt
214
Series power sensor is connected the error –241, "Hardware missing"
occurs.
Questionable; ZERO ERROR" occurs. If you are using an N1912A, the
error message specifies which channel failed zeroing.
occurs.
setting is more than 1, the error –221, "Setting conflict" occurs.
N1911A/1912A P-Series Power Meters Programming Guide