5. TECHNICAL INFORMATION
5.1 Principles of Operation:
The Quest model 1200 uses low noise, low power analog and digital
integrated circuitry to ensure long battery life, maximum stability, and
superior reliability over a wide range of environmental conditions. Figure 5
is a block diagram of the model 1200/2200's internal circuit operations.
5.2 Microphone:
The model 1200 is designed to accept a prepolarized (electret) Type 1
microphone Quest P/N #059-523 (BK #4936). The impedance of this
microphone is approximately 12pF. The microphone screws directly onto
either the remoteable preamp or the fixed microphone extension of the
meter case. A typical response curve for the Type 2 microphone is shown in
Figure 6.
The model 2200 is designed to accept a prepolarized (electret) Type 2
microphone Quest P/N #056-316 (QE7052). The impedance of this micro-
phone is approximately 15pF. The microphone screws directly onto either
the remoteable preamp or the fixed microphone extension of the meter case.
A typical response curve for the Type 2 microphone is shown in Figure 7.
CAUTION:
When installing or removing the microphone, do not unscrew
the protective grid. Do not touch the metal foil microphone diaphragm
under this grid as permanent damage may result.
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