BRUEL & KJAER 1013 Instructions And Applications page 25

1. That 6-poled plug for REMOTE CONTROL jack is in position.
2. That scale-pointer is not situated in the uncalibrated section of the
main dial, i.e. between 200ooo Hz and 200 Hz.
3. That scale-pointer is not on a section chosen for "partial blocking of
frequency range".
23