DPA Type HMA5000 Podręcznik użytkownika - Strona 2
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Drukuj stronęTECHNICAL 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).
2
1
2
3
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
negative going
positive going
negative going
positive going
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