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While programming the ENA I am receiving the error, "-128, Numeric data not allowed". Why?

(SUPPORTED MODELS IN BOLD: E5071C E5072A E5070B/71B E5070A/71A E5061A/62A E5061B E5063A E5091A E5092A)

For many analyzers, the data transfer format is adjustable when outputting data from the analyzer, i.e. for input to the controlling computer from the analyzer. For the ENA, both the data output (from the ENA to the controller) AND data input modes (from the controller to the ENA) are selectable. If error "-128, Numeric data not allowed" is occurring, adjust the transfer format via the command "FORMat:DATA {ASCii|REAL|REAL32}". The command simultaneously affects both the input and output data transfers.

Below is an image of a Keysight VEE 7.x program outlining the occurrence of the error and how the FORM command is used to rectify the error.

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