DPA Type HMA4000 사용자 설명서 - 페이지 3

{카테고리_이름} DPA Type HMA4000에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. DPA Type HMA4000 9 페이지. Two-channel hi-voltage microphone amplifier

The DPA Microphones High-Voltage Microphones Types 4003, 4004 and

4012 are powered via the Two-Channel High-Voltage Microphone Amplifier

HMA4000, which supplies 130V to their build-in preamplifiers giving the

microphones excellent SPL handling capability. But the HMA4000 is not only

a power supply unit, it is also a microphone amplifier with outstanding

specifications:

The Microphone Amplifier

The HMA4000 uses state-of-the-art, low-noise operational amplifiers from

Analog Devices ‚ in the input stages. Each channel input features

independently switchable amplification or attenuation by +20 dB; 0 dB

or -20 dB corresponding to a maximum input voltage of 1,6 V; 16 V or

160 V peak. The dynamic ranges in the three attenuator settings are:

126 dB(A)THD=0,5% in setting +20 dB; 134 dB(A)THD=0,5% in setting

-20 dB and 140 dB(A)THD=0,5% in setting 0 dB. The HMA4000 is

completely transformerless, which gives the microphone amplifier an

excellent frequency range from 10 Hz to 200 kHz (-1 dB). Furthermore,

there is only one capacitor (a high quality polycarbonate condenser) in the

signal path in the HMA4000. The HMA4000 has a channel separation better

than -90 dB measured in worst case with the attenuator setting.

Featuring both electronically balanced and single ended line-level outputs,

the HMA4000's impedance converters can drive up to 300m of cable.

Both input channels are single ended and it is recommended to use DPA

Microphone cables such as DAO0130 to keep noise rejection at its optimum.

User's Manual

Technical Description

User's Manual

Technical Description

Absolute phase

During the design process attention has been paid to the absolute phase of

the system. Positive going voltage at pin 4 on the modified 6 pin female XLR

input socket will produce positive-going voltage at pin 2 on the standard 3-pin

male XLR output socket. (Pin 1: Ground; Pin 2: Signal +; Pin 3: Signal return.

See Fig. 1 and Fig 2 for pin designation of the input and output sockets).

Fig. 1. External view of the output

socket of the HMA4000.