INFICON PLO-10i Phase Lock Oscillator - Manual (Page 20)

PLO-10 PHASE LOCK OSCILLATOR
UNDERSTANDING AND SETTING UP THE INFICON PLO-10 2-2
Connect a frequency counter to the Frequency Output.
Connect a voltmeter to the Conductance output. The center conductor on the BNC
connector is positive with respect to ground.
Connect the crystal holder, with a crystal installed, to the PLO by means of the 12-inch
coax cable.
Plug the wall mount power supply into the wall and plug the power plug into the PLO-10.
Refer to Figure 2, Figure 3, and Figure 4 for a complete system connections.
The green, Lock, LED should come on, the frequency should indicate the correct crystal
frequency and the voltmeter should indicate something between 5 millivolts and 4 volts.
Check the capacitance cancellation by pressing and holding the Reset switch. The green,
Lock LED should light. Keeping the Reset switch pressed, adjust the fine capacitance
trimmer clockwise by about 5 degrees. The yellow, Reset LED should flash. Back the
trimmer counterclockwise to the point where the Reset LED just stops flashing. The
capacitance cancellation should be checked and readjusted every time the environment of
the crystal and holder is changed. For example, if the crystal and holder are moved from
air to liquid or liquid to air, the capacitance cancellation should be checked and
readjusted.
Remove the crystal. The red, Unlock, LED should light. The green, Unlock, LED
should go off. The Sweep Rate LED should not flash. If the Sweep Rate LED flashes
the capacitance is under compensated.