Keysight Technologies 8163A/B Programming Manual page 154

4 Measurement Operations & Settings
parameters: none
response: The maximum number of data points (not bytes!) in the transferred block, as an integer value.
example: sour0:read:data:maxb?
affects: All tunable laser and DFB source modules
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8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide