IBM 7220 Instruction Manual page 65

Dsp lock-in amplifier
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Chapter 5, FRONT PANEL OPERATION
DAC 2
This control sets the voltage appearing at the rear panel DAC2 output connector to
any value between +10 V and -10 V with a resolution of 1 mV. Adjustment is faster if
use is made of the Active Cursor control - see section 4.1.04.
Figure 5-24, DAC 2 Output Control
Offset
This control allows an output offset to be added to the X output, Y output, neither or
both outputs. The actual value of offset applied, which may range from -300 % to
+300 % of the selected full-scale sensitivity setting, is set using the right-hand LCD
panel, or automatically by the Auto-Offset function. Note that the Auto-Offset
function automatically switches both X and Y output offsets on.
Figure 5-25, Output Offset Status Control
5-25

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