When an error occurs, an error message is shown in a message window at the center of the test set's display. When an error message is displayed, an audio beep occurs; the beeper state of the test set can be set to on or off. Error messages can be cleared from the test set's display using the DISPlay:WINDow:ERRor:CLEar command, or *CLS. Pressing any functional front panel key, i.e. the LOCAL key, will also clear an error message from the test set's display.
The error/event queue is read remotely using the SYSTem:ERRor? query. The error/event queue is able to hold 100 messages. The SYSTem:ERRor? query returns one error message at a time. As an error message is queried, it is removed from the error queue. To read the entire error/event queue (and thus also clear the error queue) use the following program.
10 DIM Err_msg$ 20 REPEAT 30 OUTPUT 714;"SYSTEM:ERROR?" 40 ENTER 714; Err_num,Err_msg$ 50 PRINT Err_num,Err_msg$ 60 UNTIL Err_num = 0
The message log may be viewed on the test set's display by pressing the SYSTEM CONFIG screen's Message Log key. The message log can display up to 24 entries over two pages. To clear the message log, select
Clear Message Log
), or cycle the test set's power.
These messages are generated when a condition occurs that is incorrect, but has no serious or long lasting effect on the test set's operation. Examples could include an out of range value to a parameter, or an invalid GPIB mnemonic. The message window is cleared when any front panel key is pressed.
When these errors occur no further operation of the test set is possible without cycling the power switch. Fatal errors are not saved in the error message log. The test set display will provide the user with information about what to do next and some details about what the test set was doing when the fatal error occurred.
These messages are intended to inform the user of a condition within the test set. They are generally meant to provide information to the user. The user will need to decide if this condition is undesirable and if they want the message to appear.
The Maskable Messages Display State found in the Instrument Setup menu gives users a way to block these messages and the associated beep from ever happening. When the state is Off these messages and their associated beep will be blocked. The Maskable Message Display State can be set manually or with the following GPIB command: