A system is described in which a multichannel analyzer is used to repeatedly scan a powder x‐ray diffraction spectrum in discrete intervals. Counts are recorded at a given angle for the required dwell time. A preset indexer actuated by the multichannel analyzer drives a stepping motor the required increment in angle. The channel memory is advanced by one and the above process is repeated until the end of a scan. The indexer then drives the diffractometer back to the starting angle. Scans are repeated until sufficient data are accumulated. All the scans are made in the same direction to avoid backlash errors. The system prints out the contents of the memory at definite intervals (usually every 12 h) so that in the event of a malfunction only the data taken since the last printout are lost. Other advantages and some disadvantages of the system are described.