USSR Analog Bruel and Kjaer Sound Level Meter with condenser microphone capsule

Description

Vintage Noise meter NOISE-1M30 (ШУМ-1М30)
USSR Analog Bruel & Kjaer B&K Sound Level Meter
with  USSR Analog of microphones Bruel and Kjaer condenser microphone capsule.
!This is NOT original  Bruel & Kjaer this is its similar counterpart !
The capsule microphone MAY be compatible with the Bruel & Kjaer prototype, may be used.
Сrack in the plastic glass.
All electronic components are in place inside the case.
The battery cover is missing.
When connecting the power supply, the indicator arrow moves, and repairs are required.
Sold as is, for repair, without claims, see photos, ask questions.
Parameters declared by the manufacturer:
Frequency range-31.5 Hz-8000hz.
Frequency characteristics of the device noise meter NOISE-1M30-A, B, C.
Dynamic measurement range-20dB-120dB.
The main measurement error of the device noise meter NOISE-1M30 at a frequency of 1000 Hz - no more than ±2%.
The error of the limit switch is no more than ±1dB.
The calibration error of the scale of the indicating device is no more than ±0.5 dB.
The error of energy summation of the frequency components of the noise of the device noise meter NOISE-1M30-no more than ±0.25 dB.
The range of regulation of the electrical calibration relative to the setting level is not less than ±2dB.
The power supply of the device noise meter SHUM-1M30 is Autonomous, from two batteries of the "Crown VC" type, connected in series, with a voltage of 15V-18V.
The current consumed by the noise meter from the batteries is no more than 2.8 mA.
Overall dimensions of the device noise meter NOISE-1M30-260h85h65mm.
Weight - 1.1 kg.
!For reasons beyond my control, it May be a very long delivery, you need to be patient.!
!! Consider this before purchasing. the package is delivered, but ! Regular delivery can be long, for reasons beyond my control, keep this in mind..
Faster delivery should be discussed separately( it will be more expensive) write to me if you have questions.