User`s guide

Chapter 6 Command Reference 193
LOCK
reference frequency to the measured value.
• Related Commands: LFREQ
10 OUTPUT 722; "LINE?" !MEASURES THE LINE FREQUENCY
20 ENTER 722;A !ENTERS RESPONSE INTO COMPUTER'S A VARIABLE
30 PRINT A !PRINTS RESPONSE
40 END
LOCK
Lockout. Enables or disables the multimeter's keyboard
Syntax LOCK [control]
control
The control parameter choices are:
Power-on control = OFF.
Default control = ON.
Remarks • The LOCK command is accessible from the front panel's alphabetic command
directory. However, executing the LOCK command from the front panel has no
effect.
• After disabling the keyboard, you can only enable it from the controller or by
cycling power. The LOCK command disables the multimeter's Local key.
• Query Command. The LOCK? query command returns the present LOCK
mode. Refer to "Query Commands" near the front of this chapter for more
information.
• Related Commands: LOCAL LOCKOUT (GPIB command)
Example OUTPUT 722;"LOCK ON" !DISABLES THE KEYBOARD
MATH
The MATH command enables or disables real-time math operations.
Syntax MATH [operation_a][,operation_b]
control
Parameter
Numeric
Query
Equiv. Description
OFF 0 Enables the keyboard (normal operation)
ON 1 Disables the keyboard (pressing keys has no affect)