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Depress the "Analyzer" push-button, and switch the READ OUT
SELECTOR to a "lin" position.
Select either input ("Direct" or "Preamp.") by depressing the appro-
priate push-button. Depress the "50 mV" push-button. Ensure the linear
frequency response push-button ( Ll NEAR) is depressed.
If necessary, adjust the SENS. adjustment of the chosen input, so that
the scale pointer aligns with the reference point on the meter scale (if the
scale used does not have a reference point, it may be convenient to align the
pointer with a particular graduation).
Then depress the SELECTIVE mode push-button, and switch the
SELECTIVITY CONTROL to 1000Hz.
Position the frequency scale pointer at approx. 1 kHz and turn the fre-
quency increment knob until a maximum deflection is obtained. Then,
using the 1000 Hz level adjustment potentiometer on the rear panel, adjust
the level so that the pointer again aligns exactly with the reference point (or
with the chosen graduation mark).
Repeat the procedure for the 316Hz bandwidth. As the 1000Hz and
316 Hz level adjustments are interdependent, the 1000Hz level adjustment
must be repeated. The cycle is repeated until both levels are correctly
adjusted.
The procedure is then repeated for the remaining bandwidths in the
order 100 Hz, 3.16 Hz, 10Hz, 31.6 Hz. The adjustment of these band-
widths is not dependent on any of the others, therefore it is necessary to
adjust the level once only.
The SELECT! VITY CONTROL must be switched to the appropriate
bandwidth each time.
3.1.5. Polarization vQitage
Most of the
B
&
K
condenser microphones are designed to operate with a
200 V polarization voltage. This polarization voltage is provided at the
"Preamp." socket of the 2010. The voltage is correctly set prior to dispatch
from the factory. Terminals are provided on the rear panel for checking this
voltage.
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