Miscellaneous Errors (+800...) - Keysight Truevolt Series Operating And Service Manual

SCPI Programming Reference
+740,"Calibration data lost: secure state"
+740,"Calibration information lost; count, security state, security code, string"
+741,"Calibration data lost: string data"
+742,"Calibration data lost: corrections"
+746,"System information write failure"
+747,"System information read failure"
+748,"Calibration memory write failure"
+749,"Calibration memory read failure"
+750,"Autocalibration corrections lost lost; due to firmware revision change"
+750,"Autocalibration corrections lost"
+751,"Autocalibration memory write failure"
+752,"Autocalibration memory read failure"
+753,"Autocalibration measurement out of range"
+760,"Operation aborted; high voltage present on input terminals"

Miscellaneous Errors (+800...)

+800,"Nonvolatile memory write failure"
+810,"State has not been stored"
+820,"Model and serial numbers not restored"
+821,"Controller and measurement board model numbers do not match"
+822,"Controller and measurement board serial numbers do not match"
+823,"Incorrect firmware loaded for this model number"
Keysight True volt Series Operating and Service Guide 473