This was the toughest of all calibrations so far. But it worked out perfect after about 2 hours of work and some math.
Everything was spot on, didnt make any changes
Using some voltage dropping resistors and adding those values into the equation I was able to get my function generator to operate in the parameters of the test
RMS voltage measured at 331a with oscilloscope
1: Using a 10meg resistor between the frequency generator and the 331 I found that to get the desired position on setting 5:
2: POSITION X [SETTING 5](43.2mVRMS @ 10MOHM) = -27.290325 DbV ------> +10db = -17.290325 DbV
3: -17.290325 DbV @ 10MOHM = 136.6mVRMS
4: More selector switch to SETTING 4 ------> Increase voltage till oscilloscope reads 136.6mVRMS, adjust capacitor so needle is at position X from setting 5
So basically, needle position for SETTING 5 @ 43.2VRMS with 10MOHMS = needle position for SETTING 4 @ 136.6VRMS with 10OHMS
The following resistors were used, so the equation needs to be recalculated each time
0db ---> +10db 10MOHM SETTING 5 to SETTING 4
10db --> +10db 2.7MOHM SETTING 4 to SETTING 3
20db --> +10db 330KOHM SETTING 3 to SETTING 2
30db --> +10db 0 OHMS SETTING 2 to SETTING 1
10DB sweep shown on the meter between two settings:
-10db on setting 4
to 0db on setting 3