In the Digital to analog converter HP16BME, I keep stumbling into " +FS - 1LSB " and I'm not sure what it means.
I mean, I still don't know the exact scale value because I don't know what FS stands for and what they mean by 1LSB in this example
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"FS" means full-scale, which may be determined by an external voltage. "LSB" means Least Significant Bit - in this case, the voltage represented by one least significant bit. In a 16 bit DAC like yours, that's 1/216 of the full range.
Thus, "+FS-1LSB" means "full scale voltage less one least significant bit". For a full scale voltage of 10 volts, that's 10 volts - (1/216 * 10 volts) = 9.9985 volts.