B R U E L & KJ/ER
Naerum - Denmark
Electronic Section
v a li d from se ria l n o . 3 7 34 40
2 6 1 9 .1
1 .1 . DC V olta g e s W hen typ e 26 19 is co n n e c t e d to a 1 20 V DC su p p ly .
V oltag es on G ua rd Rin g: 60 V ^ 5 V .
V o lta g e s on V j e m itt e r : 65 V
c o l l e c to r: 60 V
H e a tin g E lem ent a p p r o x . 50 m A
V ^ co l l e c to r: 1 2 0 V
e m i tte r: 65 V
1 .2 . F u nc tio n C he ck a . Pla ce the Pis ton pho ne 42 20 on th e M ic r o p h o n e o f the P rea m plifie r 2 619 and
sw itch 4220 to " M e a s u r e " .
The in d ic a t io n o f the M ic ro p h o n e A m p l ifi e r (2 1 0 7 ) sh o u ld be eq ua l to th e Sound
Pressure Level pro d uc e d b y the p is to n p h o n e (do n o t fo r g e t to co rre c t for the
co rre sp o nd ing " K " fa c to r).
b . I f a pis ton p h o n e is n o t a v a i la b le fe ed a in p u t s ign a l 1 V , 1kH z th rou gh the
in p u t a d a p tor JJ 26 15 to the p re a m p l ifie r 2 61 9 and c he c k th e o u tp u t vo lta g e
1 V .
2107
1 .3 . A tte n u a tio n
120 V D C su p p ly or a . C h eck the s e n s itiv it y o f th e M ic ro p h o n e A m p lif ie r ty p e 2107 in p o s itio n "C on -
28 V DC su p p ly denser M ic r o p h o n e " an d " D ir e c t" . If n ecessary a d ju s t d e f le c tio n to th e red
mark by means o f "S e n . C o n d . M i c r . " and "S e n . A m p l. In p u t" . C onn e c t an
in p u t sig n al (1 000 H z ) to IN P U T o f M icro p h on e A m p lifie r 210 7 and a d jus t the
in p u t v o l t a g e fo r 1 V d e fle c tio n
2619.1 - 9.71
continued
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