The Microphone Calibration Apparatus Type 4142 is primarily designed for precision calibration of the B & K "one inch" Condenser Microphones, or similar types of cylindrical shapes with diameter o.936 inch (thread o.910/l, 60NS2), by the reciprocity method defined by the American Standard Association (Z. 24.4-1949) for laboratory standard pressure microphones. In addition to the normal 20 cm3 coupler, two other couplers are provided for special purposes: (a) A 3 cm3 coupler allowing the calibration to be made at higher frequencies in air and with a 16.4 dB higher level than with the 20 cm3 coupler. The higher level may be used for carrying out comparison measurements between a reciprocity calibrated microphone Type 4132 and the less sensitive B & K half-inch and quarter-inch microphones (eventual volume change must be taken into account).
Removed From A Working Environment
The unit has some signs of wear
and normal use.
(Scuffs-Scratches-Digs-Discoloration-Markings)
Powers ON.
NOT thoroughly TESTED.
Product Guide and other accessories not included.
We do not provide technical
support on any of our products.
All units are sold without
manufacture warranties.
Includes only what is seen in ebay
pictures. What you see is what you get.
(WYSIWYG)
(Refer to pictures provided)
Sold as pictured
Returns Accepted except for
Parts/Repair items.
Ask questions before you purchase.
Hablo Espanol
Feedback is very important. Please consider leaving positive
feedback if you are happy with your purchase. If you are not satisfied, please
inform us so we can make it right before leaving negative