Agilent Technologies 16451B, Operation Manual

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7. Starting with the top adjustment screw , turn the three adjustment
screws cw in a clockwise sequence until the measured capacitance
value is within the limit listed as follows:
T able 3-4.
Capacitance P oint for Starting to Press the
Pressure A djuster
Electrode Capacitance V alue
Electrode-A Greater than 200 pF
Electrode-B Greater that 5 pF
Caution
Stop turning the screw if the capacitance value becomes negative or
extremely high, or the dissipation factor (D) increases suddenly . In
this case , immediately turn the screw ccw to separate the electrodes .
If the screw is turned further , it may damage the micrometer and the
surface of electrodes .
When the measured capacitance value increases widely during
turning a screw , turn more slightly the screws .
8. Keep pressing the Guarded/Guard electrode pressure adjuster as
shown in Figure 3-25 and turn the three screws in a clockwise
sequence until the measured capacitance value is within the limits
listed in T able 3-5
T able 3-5. Capacitance Limits at V ertical P osition
Electrode Capacitance V alue
Electrode-A 700 pF to 1000 pF
Electrode-B 12 pF to 17 pF
Stop turning the screw if the capacitance value becomes
negative or extremely high, or the dissipation factor (D)
increases suddenly . In this case , immediately turn the screw ccw
to separate the electrodes and redo adjustment.
9. Place the 16451B so that the surface of electrodes are horizontal
and check that the measured capacitance value is within the limit
listed in T able 3-6
T able 3-6.
Capacitance Limits at Horizontal P osition
Electrode Capacitance V alue
Electrode-A Greater than 700 pF
Electrode-B Greater than 12 pF
When the measured capacitance value is less than the limit,
place the 16451B so that the surface of electrodes are V ertical.
Then keep pressing Guarded/Guard pressure adjustment and
carefully turn the three screws in a clockwise sequence until the
measured capacitance value is within the limits in T able 3-6
Operation 3-43