Bnc 645 User Manual download pdf (Page 150)

150

MEMory:STATe:VALid? {0︱1︱2︱3︱4}

Query the specified storage location to determine if it currently stores a valid

instrument state. “0” is returned when there is no valid state stored in that

location and “1” is returned when there is a valid state stored in that location.

MEMory:NSTates?

Query the number of storage locations available for storing the states. “5” is

returned.

-- O --

*OPC

Set the “Operation complete” bit (bit 0) in the Standard Event Register after all

of the previous commands have been completed. Other commands may be

executed before the bit is set. This command is used in the triggered sweep or

triggered burst modes to provide a way to poll or interrupt the computer when

the *TRG command is complete.

*OPC?

Returns “1” to the output buffer after the previous commands have been

completed. Other commands can not be executed until this command

completes.

OUTPut {OFF|ON}

Disable or enable the Output connector on the front panel. The default is OFF.

The Output key is lit when enabled.

• The APPLy command overrides the current OUTP command setting and

automatically enables the Output connector.

• The Output connector will be disabled when an excessive external voltage

is applied to it. To re-enable it, remove the excessive voltage and use this

command to enable it again.

• This command changes the state of the output connector by switching the

output relay. However, this command does not zero the voltage to be

output before switching the relay. Thus, the output signal may have

“glitches” for about a millisecond until the signal stabilizes. You can

minimize these glitches by first setting the amplitude to the minimum

(using the VOLTage command) and the offset to zero (using the

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Bnc 645 User Manual Page 150