Keysight 34950A User’s Guide 27
Set which trace to use.
The SOURce:DIGital:MEMory:TRACe command
assigns the desired trace to the bank. This command allows you to switch
between the traces pre-loaded into the bank’s memory.
Enable the memory.
Enable the memory on the bank using the
SOURce:DIGital:MEMory:ENABle command. This command sets the selected
trace to be the output and puts the bank in the wait-for-trigger state.
Trigger the output.
When the default trigger source is used, the
SOURce:DIGital:MEMory:STARt command triggers the output. The selected
trace will be output when the handshake occurs.
If the trigger source has been set to one of the interrupt lines (see page page 30),
the output will wait for the interrupt to occur and then the handshake to occur
before the trace is output.
You can also output the trace one sample at a time on the data lines using the
SOURce:DIGital:MEMory:STEP command. This command outputs one sample
and then puts the memory in the stopped state. The STEP command also
overrides the interrupt line so it can be used to trigger a transfer even if the
interrupt line is set to be the trigger source.
Deleting Trace
You can delete traces in memory to recover the memory space. Use the
TRACe:DELete:NAME command to delete a specific trace. Note that deleting a
specific trace does not de-fragment the memory. You can delete all traces using
the TRACe:DELete:ALL command.
Buffered (Memory) Input
Each bank on the 34950A has its own memory for use in buffered transfers.
Changing a bank from an output to an input will clear all memory for that bank.
The general steps to use input memory are:
1 Set the channel width and parameters.
2 Set the handshake mode.
3 Set the number of samples to collect.
4 Start the capture.
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