Agilent Technologies 16451B, Operation Manual

Page: 86 / 149

A ccurate A djustment
to Make Electrodes
P arallel
When Electrode-A and Electrode-B are used, perform the following
procedure after performing the \Rough A djustment to Make
Electrodes P arallel". When you use Electrode-C and Electrode-D (Thin
Film electrodes), you do not need to perform the rough adjustment.
A ccurate A djustment in V ertical P osition
When the Contacting Electrode method (Rigid Metal electrode) is used
with Electrode-A and Electrode-B , perform this adjustment after the
above mentioned adjustment(\Rough A djustment to Make Electrodes
P arallel") is performed. The procedure of \A ccurate A djustment in
V ertical P osition " is as follows .
1. Clean the electrodes . This is necessary because the capacitance
value is aected by dust. (Refer to \Changing the Guarded/Guard
Electrode ".)
2. P erform OPEN/SHORT correction. (Refer to Appendix C.)
3. Connect the 16451B to an LCR meter or an impedance analyzer
and select the capacitance measurement function (C
p
) for Circuit
mode . (Refer to \Connecting to the Instrument".)
4. Place the 16451B so that the surfaces of electrodes are vertical as
shown in Figure 3-27.
Figure 3-27. V ertical P osition
5. Turn the large knob of the micrometer ccw to make enough
room between the Guarded/Guard electrode and the Unguarded
electrode to remove the covers of both electrodes .
6. Turn the small knob of the micrometer cw and adjust it until
the micrometer scale indicates 0.01 mm (10 m) as shown in
Figure 3-28.
If the electrodes make contact before 0.01 mm, turn the three
adjustment screws ccw to move Unguarded electrode the away
from the Guarded/Guard electrode until the scale can be adjusted
to 0.01 mm.
3-40 Operation