Keysight E4981A Programming Manual page 370

Status Reporting System
Status Register Structure
Issuing the command will clear all bits from the operation status event
*CLS
register.
The E4981A does not support events of the questionable status register.
Therefore, all of the bits in this register are always 0.
Table C-4 Status bit definitions of the Questionable Status Register
Bit Description
Name
Position Cond ition Register Event Register
0 to 15 Not used Always 0 Always 0
370 Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter