58542 VXIbus Universal Power Meter
2-20 Publication 21555, Rev. E, September 2002
2.5.13.1 Special Errors
An unusual or non-sense numeric response, such as 9e+40, indicates an error response. For instance, not
performing the power sweep calibration procedure to calibrate the sensor to the power meter, the
response to a MEAS#? command will be 9.0000e+40.
Selected basic SCPI syntax and execution errors apply to these commands.
If using the READ#? measurement query and INIT:CONT is ON, a bad value is returned, 9e+40.
Sending SYST:ERR? error query, -213, Init ignored will be returned. READ#? contains the low level
function INIT, since INIT:CONT is ON the INIT within READ#? generates an error. Set INIT:CONT
to OFF when using READ#?.
There are no device-specific errors for the preset configuration or status reset commands except the high
level -300, Device-specific error response.
Example programs for Reading Power Measurements are contained in Appendix A.
*OPC
Example:
OUTPUT @PWR_MTR;*OPC ! *OPC ALLOWS ONE-TIME SRQ ENABLE
Description:
The *OPC command determines when an operation is completed. This command is generally
used to monitor the completion of long measurement sequences. It sets the operation
complete bit in the event status register upon completion of operation.
*OPC?
Example:
OUTPUT@PWR_MTR;*OPC? ! RETURNS A VALUE OF 1 AFTER AN OPERATION IS COMPLETED
Description:
The *OPC? operation complete query allows synchronization between the controller and the
test set using either the message available (MAV) bit in the status byte, or a read of the output
OPC?.
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