BRUEL & KJAER 1013 Instructions And Applications page 22

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4. Set the pointer of the main scale to the lowest frequency of the
desired frequency range.
5. Turn the inner disc to the right (seen from behind) until the contact
is activated by the cam disc.
6. If necessary tighten the lock-out so much that the cam disc is not
displaced when the main scale pointer is moved.
7. Set the main scale on the highest frequency within the desired
frequency range and turn the outer cam disc to the left until the
contact is activated. Be carefull that the inner cam disc does not
move.
8. The cam disc in the middle should be rotated so that it does not
interfere with the frequency range in use.
Knurled Nut
Fig. 3.4. Cam disc arrangement.
9. Tighten the lock-nut, still being carefull that the cam discs do not
move.
10. Replace the rear plate.
11. Connect the apparatus to the power supply line and set POWER
switch to "On".
12. After a few minutes warm up calibrate as described in A. This can
be done when the REMOTE CONTROL plug is removed.
13. Replace the REMOTE CONTROL plug and set the main scale pointer
to a frequency inside the desired frequency range.
14. Turn OUTPUT LEVEL to a suitable deflection on the meter.