BRUEL & KJAER 2225 - DC Output and Mounting Bush

Fig.2.2. Right-hand side view of the Type 2225 or 2226 showing
DC OUTPUT socket
DC OUTPUT: Socket providing a DC voltage proportional to measured level
(50 mV / dB). Output impedance 10 kO. Accepts 2,5 mm mini - jack plug
(B & K No. JP 021 3). When in use the automatic switch-off is dis-
abled, and in addition, in the case of the 2226, "Max. hold" is overrid-
den and normal continuous operation of the instrument's display is ob-
tained . Levels can be continuously fed to a recorder in "Fast", "Slow"
and "Impulse" (2226 only). In "60s L e q" the accummulated dose is
output until the 60s Leq is reached after one minute and then the
measurement is restarted . In "Peak" (2225 only), the maximum peak
detector is reset automatically whenever a higher peak occurs . The
peak value is held for a period of 0,3 s, after which the detector is
reset, unless a higher peak value occurs during that time, causing an
immediate reset. The stored peak value is output continuously. With
the 2226 only, overload is indicated by a high DC output.
TRIPOD MOUNTING BUSH: Located near the bottom of the rear of the instrument case. The thread
is UNC 1 I 4" x 20, the standard tripod mounting thread.
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