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Message ID: 1137     Entry time: Wed Nov 3 20:52:14 2010
Author: Zach 
Type: Electronics 
Category: GYRO 
Subject: PDH box #1437 gain vs. gain knob setting 

Below is a plot of the measured gain of a 1-kHz sine wave through PDH box #1437 with a varying gain knob setting. The variable gain stage (AD8336) is linear in dB with a slope of roughly 5 dB per unit. This allows us to generalize the measured TF at, say, G = 0.5 to any gain setting. Alastair's measurement in ELOG 1080 is consistent with a gain setting of 0.5, so if we can get his data we will have a generally applicable TF.

PDH_1437_gain_knob_cal.png

 

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