T he Mea suring Ampl ifier T ype
2609 is inlended for use in the audi o
freq uency range where its pr incipa l
appl icat ion will be as a micro ph one
am plifier. T he mete r meas u res RMS
voltage accord ing to !E C 651 a nd includes an A-we ighting net work. Th e
Type 2609 feat ures con nect.ions for a
cond enser micropho ne prea mplifier
via a 7-pin B & K socket , so t ha t wit h
a suita bly posit.ioned conde nse r microphone, mea sur em ents can be made
that conform with t he IEC 651 st anda rd (Ty pe 1). Th e Measu ring Amplifier also includ es prov ision for t he direel conn ect ion of acce leromete r pr eamplifi ers. It ca n be used as a n input
am plifier when reco rding sou nd or vibrat ion signals wit h tape recorder s,
where ga in adju sta ble in 10 dB steps is
a useful capability. T he Ty pe 2609 is
the idea l amplifi er and mete r in mul tichann el noise monito rin g syste ms, a nd
as an aud io frequ ency compresso r amplifier in feedb ac k cont rolled syst ems.