DPA Type HMA5000 Manuel de l'utilisateur - Page 2

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TECHNICAL DESCRIPTION

The DPA High-Voltage microphones types: 4003, 4004, 4012, 4016,

4041-S, and 4041-T are powered via the Two-Channel High-Voltage

Microphone Amplifier HMA5000, which supplies 130 V to their built-in

preamplifiers giving the microphones excellent SPL handling capabili-

ty. But the HMA5000 is not only a power supply unit, it is also a micro-

phone amplifier with outstanding specifications.

The Microphone Amplifier

The HMA5000 uses state-of-the-art, low-noise operational amplifiers

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

independently switchable gain by +30 dB, +20 dB, +10 dB, 0 dB, -10 dB

or -20 dB corresponding to a maximum input voltage of 0.5 -160 V

peak.

The signal path in the HMA5000 is completely transformerless, which

gives the microphone amplifier an excellent frequency range from 10

Hz to 100 kHz (-1 dB). The HMA5000 has a Crosstalk attenuation better

than 90 dB measured with any gain setting.

Featuring both electronically balanced and single ended line-level out-

puts, the HMA5000's impedance converters can drive up to 300 m

(984 ft) of microphone cable. Both input channels are single ended

and it is required to use the dedicated DPA Microphone cables in order

to optimize noise rejection.

Polarity Switch

A polarity switch for each channel is found on the rear next to the

output connector of the corresponding line output.

In the position "0°" the HMA5000 system has absolute phase from

input to output.

Switching to "Inv." (Inverse) will invert the phase.

(See Fig. 1 and Fig. 2 for pin designation of the output and input con-

nectors).

Fig. 1. External view of the output connector of the HMA5000.

Polarity

Positive going

- produces this elec-

sound pressure on

trical signal on the

microhone type:

HMA5000 input

pin 4:

DPA 4003

positive going

DPA 4004

positive going

DPA 4012

positive going

DPA 4016

positive going

DPA 4041-S

negative going

DPA 4041-T

negative going

When switch in 0

When switch in

position then

"Inv."-position,

HMA5000 output

HMA5000

on pin 2 is:

output on pin 2 is:

positive going

negative going

positive going

negative going

positive going

negative going

positive going

negative going

positive going

negative going

positive going