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The Advanced

Model 3250/4250 Service Manual

To check and reset the freeze amplitude set-

ting:

1. Turn on the instrument. If there is a

Supervisor/Operator keyswitch, turn it to

the Supervisor position (if required).

2. Press TEST. Press < or > to select “Stir/

Freeze Test”, and then press START.

3. At “[stir] [freeze]”, watch the tip of the

stir/freeze wire and press >. The freeze

vibration should buzz loudly, and the

vibration blur at the tip of the wire will

last one second. The amplitude should

measure about 13mm (1/2”).

If the freeze amplitude is not within the

correct range, follow steps 4-6 below.

4. Remove the head cover and clear away

any metal chips between the coil frame

and the clapper (A).

5. Check the position of the yoke (B) and

clapper. The yoke must be 90º and flush

against the back wall of the head. Bend

the yoke if the clapper appears too close

or too far away from the coil frame. The

clapper does not have to be directly paral-

lel to the back wall of the unit.

6. Adjust the freeze “buzz” amplitude, as

described in the user’s guide Chapter 2:

Changing Operating Settings:

Freeze “Buzz” Amplitude

Advanced Instruments 4250 User Manual

Questions and Answers: