i. | In
order to confirm whether ample oscillation allowance has been provided for the oscillator
circuit or not, it is necessary to find out the negative resistance (-R) of the oscillator
circuit. |
|
ii. | Insert,
as shown in Fig.1 a variable resistor (VR) (for checking) in series with the quartz
crystal unit. Then keep dropping the resistance until oscillation initiates. (In this
case, disregard the drop in the oscillation output, and merely confirm oscillation.) |
|
iii. | To assure the
provision of an ample oscillation allowance for the oscillator circuit, adjust C1, C2 and
Rd?? so that the resistance of the variable resistor (used for checking) becomes 5-10
times larger than the equivalent series resistance (CL value) of the quartz crystal unit. |
|