MPA 201 Microphone

The MPA 201 microphone is a primary transducer that allows you to convert sound pressure into an electrical signal and serves as the primary transducer in the chain of the recording path. The MPA 201 microphone is the best solution for use in Class 1 sound level meters of IEC61672 Standard, as well as in other equipment for measuring the noise level of Class 1 accuracy and above. The case and diaphragm of the microphone are made of the same nickel alloy, which provides the minimum temperature coefficient. In the course of production control in the manufacture of MPA 201 microphones, only 40% of the error of the frequency response allowed by the IEC61672 standard for microphones of Class 1 accuracy is allowed.


Diameter 1/2 inch
Standards (IEC 61672) Class I
Optimization Free field
Preamp MA231
Frequency response from 20 Hz to 20 kHz
No load sensitivity (± 2 dB) 45 mV / Pa
Output impedance less than 50 ohms
Dynamic range 16 to 134 dB (A)
Noise level less than 16 dB (A)
Operating temperature range from -30 to 80 ° C
Relative humidity range from 0 to 95%
Temperature coefficient 0.005 dB / ° C
Relative humidity coefficient 0.003 dB /%
Pressure ratio (250 Hz) -0.004 dB / kPa
Microphone length 110 mm
Connector BNC
Cable type BNC-BNC
Length of cable 2 m

BC 501 Microphone

The ZET 501 / BC 501 microphone is a primary transducer that allows you to convert sound pressure into an electrical signal and serves as the primary transducer in the recording path chain. The microphone is a relative (differential) pressure sensor in gases.

Any microphone consists of two systems:

  1. acoustic-mechanical,
  2. mechanoelectrical.

The properties of the acoustic-mechanical system strongly depend on whether sound pressure acts on one side of the diaphragm (pressure microphone) or on both sides, and in the second case, whether this effect is symmetrical (pressure gradient microphone) or on one side of the diaphragm fluctuations that directly excite it, and on the second – those that have passed through any mechanical or acoustic impedance or time delay system (asymmetric pressure gradient microphone).

A large influence on the characteristics of the microphone has its mechano-electric part.


Technical Specifications

Execution three-wire ICP
Accuracy class 3 (IEC61672 standard)
Sensitivity 15 mV / Pa 50 mV / Pa
frequency range 50 to 13,000 Hz
Measurement error at a nominal frequency of 1000 Hz 2 dB
Signal to noise ratio ≥60 dB
Output impedance <500 ohm
Supply voltage +5 V + 18 to 30 V
Power supply 3 mA
Output constant voltage level 10 to 13 V
The diameter of the cap 1/2 inch
Body material stainless steel
Weight (without cable) 40 g
Cable 3-pin integrated cable BNC-BNC
Standard cable length 2 m
Airtight design for harsh environments