D
. By referring to the Figure above, adjust VR2 using a ceramic screw or any tools
appropriate for adjusting variable component to make the output voltage approach to
zero. (This way the Offset is adjusted into range within 0.1mV).
E
. Put SW1 at 1/100 (or 1/200) attenuation setting as indicated again at the front
plastic cover of the probe.
F.
Again referring to the Figure above, adjust VR4 to make output voltage approach
to zero. (This way the Offset is adjusted into range within 0.1mV). However, when VR4
is changed, the Offset at 1/10 is affected, thus we must calibrate again the 1/10 by
repeating steps C and D.
G.
Again adjust the Offset at 1/100 by repeating steps E and F. Through this
continual repetition, we are minimizing the Offset for both SW1 settings until the Offset
for both attenuation (1/10 and 1/100) is set to the ideal zero or within range of 0.1mV.
Fig. 8
4
