Microtech Gefell Measurement Microphone Preamplifier MV 230 Digital

Description

The 1/2 “measuring microphone amplifier MV 230 digital connects a high-resistance impedance converter for externally polarized measuring microphone capsules with a complete analogue-digital converter.

It is suitable for the transmission of high sound pressure levels over long cable runs without – often unnoticed – signal corruption and without the disturbance of “humming earth loops”. All voltages required to operate the measuring microphone capsule are generated internally. EMC problems that, for example, cause cell phones in the vicinity of conventional microphones are significantly reduced by the MV 230 digital. The MV 230 digital supports data transfer according to AES 42-2001 as well as AES 3-1992 (AES / EBU). The very large dynamic range is achieved through the simultaneous operation of two 24-bit sigma-delta AD converters in two separate level ranges.

With the adapter, A 63.1 externally polarized 1 ”measuring microphone capsules and with the adapter A 67 externally polarized 1/4” measuring microphone capsules can be operated. The capsule connection of the preamplifier corresponds to the international standard according to IEC 61094.

The measurement microphone preamplifier MV 230 digital is suitable for class 1 sound level meters according to IEC 61672.

ADC		Sigma-Delta converter 24 bit 96kHz in 2 level ranges
Power consumption		˂ 100 mA
Operating voltage		5.6V to 15V
Polarization voltage		200 V
Frequency range		1 Hz to 40 kHz
Dynamic range		˃ 140 db divided into 2 level ranges
Sampling frequencies, switchable		96 kHz / 48 kHz
Input impedance		20 GOhm ǁ 0.2 pF
Self-noise	A-rated	≤ 2.5 µVeff
	with measuring microphone capsule MK 221	15 dB – A
Max. Input voltage	Channel 1	24 V
	Channel 2	0.24V
Level ranges	Channel 1	for MK 221 with 50 mV / Pa 146dB
	Channel 2	106 dB
Remote control	High pass	10 Hz
	Sampling frequency	96 kHz / 48 kHz
	polarity	positive / negative
Connection standards	1. AES 42 – 2001	1. AES 42 – 2001
	2. AES 3 – 1992 (AES / EBU) + operating voltage + remote control data	2. AES 3 – 1992 (AES / EBU) + operating voltage + remote control data
	3. SPDIF	3. SPDIF (on request)
Connectors		XLR 5 M.
Capsule connection thread		11.7mm 60 US
diameter		Ø 12.7 mm / 21 mm
length		158 mm
Weight		87 g