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{3}
Carry out the following procedure on each solenoid in turn:-
(i)
Screw in the central {armature} adjustment until
two
distinct
'clicks' are heard, indicating that both microswitches have
operated: turn the adjusting screw in a further quarter of a
turn and then tighten the lock nut. -
{ii} Repeat the above adj ustment on the other so lenoid.
{iii} Swi tch off the power.
{iv} Turn the 'back stop' pozidrive screw down unti I the armature plate
just starts to
lift
at its hinged point.
{v} Turn the adjusting screw back
a quarter turn and tighten the lock
nut.
(vi) Repeat (iv) and {v} on the other solenoid.
{4}
Switch on the power and check that the solenoids operate correctly as
the SENSITIVITY switch is operated, as follows:-
Switch Setting
O.OlV
O.lV
lV
So lenoid'Operation ,
Nei ther energised
RLA on: RLB off
Both
energised
{5}
Finally, seal both adjustments on each relay with a suitable varnish.
Amplifier Divider Assembly: 19-0630
4.8
Sensitivity {Shaper} Adjustment
(l)
From a signal generator apply a signal of 10 MHz at 10 mV r.m.s. to
the INPUT socket of the instrument.
{2}
Set the SENSITIVITY switch to O. 01V.
(3)
Connect the high impedance probe of an oscilloscope to the junction of
C18/R31 on the Amplifier Divider Assembly (Fig.4.9).
(4)
Adjust potentiometer R24 to the centre of the movement which produces a
1: 1 mark-space ratio on the rectangular wave form. The amplitude
should be approximately 500 mV peak-to-peak.
9010-9013
4 - 5
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