GEC ALSTHOM MVAJ23B1AB0757B Communication module

The programming channels may be trimmed by approximately ± 10% using the 8-bit trim adjustments DACs. The DACs can be programmed in two ways, either directly using a hexadecimal input (00 to ff), or as a percentage of full scale (0% to 99%). Direct hex programming provides greater resolution and is the preferred method. The trim setting should only be adjusted after the unit under test has fully warmed up.

The readback channels are trimmed 

quite differently from the programming channels. Internal to the RSTL is an AD7710 21-bit A/D converter. the input to this converter is slightly offset in the positive direction to force a zero input to cause some slight reading. the gain of the buffer-amplifier stage before A/D is set to provide a full-scale signal manipulation to “normalize” the readback data to the actual supply output levels. Readback trimming is limited to about +10% max on offset adjustments, and 20% max on gain adjustments.

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