Status Byte Eav (Error Available) Bit; Table B-4 Calibration Errors - Keithley 2425 Service Manual

B-10 Command Reference
Error 503/504 — Will occur when the source/compliance DAC calibration constants
generate an invalid DAC setting. All of the source/compliance DAC calibration constants
are verified each time a :CAL:PROT:SOUR command is processed and when the Model
2425 is first turned on. This error generally occurs when the Model 2425 source circuitry
is defective.
Error 505 — Will occur when a :CAL:PROT:SOUR command generates an invalid
source offset calibration constant.
Error 506 — Will occur when a :CAL:PROT:SOUR command generates an invalid
source gain calibration constant.
Error 507 — Will occur when a :CAL:PROT:SENS command generates an invalid
measurement offset calibration constant.
Error 508 — Will occur when a :CAL:PROT:SENS command generates an invalid
measurement gain calibration constant.
Table B-4
Calibration errors
Error number
+500
+501
+502
+503
+504
+505
+506
+507
+508

Status byte EAV (Error Available) bit

Whenever an error is available in the error queue, the EAV (Error Available) bit (bit 2) of
the status byte will be set. Use the *STB? query to obtain the status byte, then test bit 2 to
see if it is set. If the EAV bit is set, an error has occurred, and you can use the appropriate
error query to read the error and at the same time clear the EAV bit in the status byte.
Error message
"Date of calibration not set"
"Next date of calibration not set"
"Calibration data invalid"
"DAC calibration overflow"
"DAC calibration underflow"
"Source offset data invalid"
"Source gain data invalid"
"Measurement offset data invalid"
"Measurement gain data invalid"
Model 2425 Service Manual