Remote Operation
Commands 5
5-33
Table 5-2. Commands (continued)
OHMREF?
Description Return calculated resistance reference as shown in calibration report (average actual-to-
nominal ratio of the 100 ohm to 190 kohm resistors).
Parameter
CAL (From active calibration constants)
CHECK (From calibration check constants)
PREV (From previous calibration constants)
Response (Float) The resistance reference value.
Example: OHMREF? CHECK 1.000021902360723E+00
OLDREF
Description Overlapped command, ignored if not in remote.
Sets the calibrator’s output to the previously-programmed reference value. (The same as
pressing the ENTER key in local operation.)
Parameter None.
ONTIME?
Description Sequential command.
Returns the time in minutes since the calibrator was turned on.
Parameters: None.
Response (Integer) Number of minutes since power-up this session.
*OPC
Description Sequential command.
Sets bit 0 (OPC for "Operation Complete") in the Event Status Register to 1 when all
pending device operations are complete.
Parameter None
Response Sets bit 0 (OPC for "Operation Complete") in the Event Status Register to 1 when all
pending device operations are complete.
Example: After sending an OUT command, check if the output has settled by sending *OPC. As soon
as the output has settled, a pending *OPC command sets bit 0 (OPC for "Operation
Complete") in the Event Status Register to 1. The command to read the ESR is *ESR?.
*OPC?
Description Sequential command.
Causes program execution to pause until all operations are complete; returns a 1 upon
completion of these operations. (See also *WAI.)
Parameter None
Response (Integer) "1" after all operations are complete.
Example: If you had sent an OUT command, you can check if the output has settled by sending *OPC
or *OPC?. As soon as the OUT command has completed (output settled), a pending *OPC
command places a "1" in the output buffer to be read by the controller.
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