User`s manual

Clearing the Multimeter When the multimeter is selected from the HP E1301A mainframe menu, the
multimeter is cleared by pressing the “Clear Instr” key on the front panel.
The multimeter is also cleared by sending the following command from an
HP 9000 Series 200 or Series 300 controller:
CLEAR 70903
Clearing the multimeter:
– allows you to regain control without cycling power and without
setting the power-on configuration.
– with the HP E1301A “Clear Instr” key terminates any
command entered from the front panel. A command sent from
the computer will still continue to execute.
– from the computer (CLEAR 70903) terminates any command
sent from the computer. A command entered from the
HP E1301A front panel will still continue to execute.
– erases any pending commands. For example, if commands are
sent from the computer to the multimeter while the multimeter is
waiting for an external trigger, the commands are buffered until
they can execute after the trigger is received. Clearing the
multimeter (from the computer) erases those commands.
Similarly, clearing the multimeter from the HP E1301A front
panel erases any pending front panel commands.
– if cleared from the HP E1301A front panel, the display buffer is
cleared. If cleared over HP-IB, the data in the output buffer is
erased.
The Error Queue When an error occurs during operation, an error code and corresponding
message are stored in the multimeter’s error queue. If the Series B
mainframe has a display (HP E1301A) and the multimeter is being
monitored, the "err" annunciator will turn on.
Since many mainframes may not have a front panel display, the other way
to determine if an error has occurred is to read the error queue. This is done
with the command:
SYSTem:ERR?
The following program shows how the command is used to read and clear
the error queue.
10 !Declare a string variable in the computer to store the error message.
20 DIM Message$[256]
30 !
Read the error queue until no errors remain.
40 !Print the error codes and messages.
50 REPEAT
60 OUTPUT 70903;"SYST:ERR?"
70 ENTER 70903;Code,Message$
80 PRINT Code,Message$
90 UNTIL Code=0
100 END
Chapter 1 Getting Started with the HP E1326B/E1411B Multimeter 19