BRUEL & KJAER 1615 - Use with Amplifier 2606

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The signal level within the chosen filter, and referred to the input of the
measuring arrangement is read according to the same method as explained in
the instruction manual for the Microphone Amplifier Type 2603/04.
CALIBRATION
Two different calibrations of the system can be used, one calibration with
respect to the measuring transducer used, the other, a calibration as a volt-
age
analyser. For calibration with respect to the transducer two methods are
available:
One
using the transducer sensitivity correction factor the other a direct
physical calibration using some suitable acoustical or vibration calibrator.
For further information refer to the appropriate B & K Instruction Manual
on the transducer employed.
1.
Set control knobs of Microphone Amplifier:
2.
INPUT SWITCH: "Direct"
METER SWITCH: "Ref."
METER RANGE: "Fast", "RMS"
RANGE MULTIPLIER: "x1, OdB"
FREQUENCY
RESPONSE SWITCH
respective WEIGHTING
NETWORK: "External filter"
Set control knobs of Filter Set:
POWER
SCANNING
"On"
"Manual"
3. The meter should now show a deflection to the red mark on the
microphone scale. Possible deviations being corrected by the screw-
driver
operated potentiometer marked SENSITIVITY- AMPLIFIER
INPUT
on the front panel of Microphone Amplifier.
As
stated the Level Recorder Type 2305 can be used to scan the Pass Band
Filter Set and record the subsequent analysis. The synchronization is
described in Fig.4.8.
3.
USE WITH AMPLI Fl ER TYPE 2606
The Type 2606 is a more advanced model of the 2603/04 with a wider
overall frequency range (2 Hz-200 kHz) which covers both the 1614 and
1615. A
typical set up for operation is shown in Fig.4.2. This system can be
used to record sound or vibration or analyse other voltage waveforms if
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