Optimize Quad Frequency on 5977 source

Question

Hi, Post 
 
 The 5973 and 5975 manuals had the recommended range to adjust the quad frequency when entering100mz and 650mz, but I don't see the recommended ranges in the 5977 manual under adjusting the quadrupole frequency. What are the recommended values for the 5977 MS? 
 Thanks!

paulsalverda · Accepted Answer

At 100 it's typically below 100mV. At 650 it's typically below 750mV. 
 The raw number changes as the quad heats up during the test from the applied voltages. The raw number is not absolute, don't think that "it should be 66mV but I can only get it to minimize at 68mV" -- that is not meaningful. This adjustment needs to be close but a tiny amount of a turn off either way won't cause any difficulties. Make sure that both adjustment slugs are out about the same distance - don't have one adjusted way in and one adjusted way out, for example. 
 This is not adjusting the frequency, this is minimizing the required power needed to drive the quad RF at two different setpoints. Lower power is better for the electronics and the quad itself, better for the lifetime of the instrument, and only sort of tells you if the electronics and quad subsystem are functioning properly. If a system can't be dipped it means more troubleshooting but if it can be dipped and the minimum is below the aforementioned limits above, run it.

Optimize Quad Frequency on 5977 source

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