DPA 4003 Руководство пользователя - Страница 2

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TECHNICAL DESCRIPTION

The cartridge

Types 4003 and 4006 are omnidirectional (pressure) microphones

that use a 16mm diameter prepolarized condenser cartridge. The

diaphragm is a nickel foil which has been coated with an ultra-thin

polymer layer for optimum corrosion resistance. The microphone

housing is of German silver, an alloy with a high content of nickel to

match the stable thermal qualities of the diaphragm. The cartridge

has low self noise (typical 15dB(A) re. 20µPa) and high sensitivity

(4003: 40mV/Pa and 4006: 10mV/Pa). For optimum stability the

microphone cartridges have undergone a special pre-aging process

which stabilizes all tensions in the materials as well as the polariza-

tion voltage.

The preamplifiers

Types 4003 and 4006 are acoustically identical, but differ in their

preamplifier powering system. The 4003 is powered with 130V via

the HMA4000 High-Voltage Microphone Amplifier and has a modi-

fied 4-pin XLR-connector (see Fig. 1 for pin designation). This special

powering system enables the microphone preamplifier to handle

approximately 10dB higher SPL than similar microphone types pow-

ered through conventional P48 systems (4003: 154dB SPL peak

and 4006: 143dB SPL peak).

Furthermore the 4003 together with the HMA4000 is a totally

transformerless system and therefore has an extended low-fre-

quency handling capability (10Hz to 20kHz ± 2dB). The 4006 is pow-

ered via a standard P48 system and is equipped with a standard 3-

pin XLR-connector (see Fig. 2 for pin designation). Types 4003 and

4006 use state of the art low-noise preamplifier technology. The

preamplifiers are driven with unity gain to keep noise as low as pos-

sible.

All microphones come with an individual calibration chart of the self

noise, sensitivity and the individual frequency response.

Ground

Fig. 1. External view of the output socket of the Type 4003.

Important:

The microphone will only operate within it' s specifications if

powered correctly.

Ground

Signal -

Fig. 2. External view of the output socket of the Type 4006.

Signal

130 V DC

Preamplifier Supply

Signal +