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Eric,
What does the booklet (manual) say?
I'm not familiar with your meter, but most of them have (at least) four settings: "high" an "low" sensitivity, "calibrate" (could that be your "c"?) and "battery". The last one only to check if the battery is still charged enough.
"Calibrate" does not really measure sound levels, but is used to set the meter nicely given the (remaining) voltage of the battery.
Only "high" and "low" are for measurements (perhaps "A" and "B" on your meter?)
But then again, this may not apply to your meter at all.
Cees
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