IBM 7220 Instruction Manual page 72

Dsp lock-in amplifier
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Chapter 5, FRONT PANEL OPERATION
5-32
Ratio
Shows the ratio, where ratio = (X output / ADC1 Input), usually used to compensate
for source intensity fluctuations in optical experiments.
Log Ratio
Shows the logarithm to base 10 of the ratio, where ratio = (X output / ADC1 Input),
usually used to compensate for source intensity fluctuations in optical experiments.
Figure 5-37, Ratio Output
Figure 5-38, Log Ratio Output

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