BRUEL & KJAER 1618 - Page 23

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1. Connect the instrumentation as shown in Fig . 3.5 .
2.
Adjust the Measuring Amplifier as described in its Instruction Manual, and in sec-
tions 3.2.1 , 3.2.2 and 3.2 . 3, with the following changes and additions:
REF 50mV RMS
INPUT ATIENUATOR
Push in to obtain the reference voltage
"0,1 V/ + 80dB", to obtain a needle deflection to
the reference mark at the middle of the scale
(50mV)
3. Adjust the Band Pass Filter as described in sections 3.2 .1, 3 . 2.4 and 3 .2 .5, with
the following changes:
MANUAL FILTER SELECTOR
Set
to 1 60 kHz
FILTER CONTROL MODE
Left-hand switch : "Recorder"
RANGE
"Linear"
4 . Make the preliminary adjustments, load batteries and frequency calibrated recording
paper, etc
., as described in the Level Recorder Instruction Manual section on opera-
tion, and adjust the controls of the 2306 as follows :
DC LINEAR POSITION
SENSITIVITY
PAPER SPEED
Recorder Mode
Meas . Amp . Mode
AC Logarithmic
2608 AC, Linear
2606 AC,
Linear
2607 AC,
Linear
2607 AC, Logarithmic
DC Logarithmic
2608
2606
DC, Linear
2607 DC, Linear
2607 DC, Logarithmic
DC Linear 2608
2606
DC, Linear
2607 DC, Linear
2607 DC, Logarithmic
Immaterial
"0"
As appropriate
Note that frequency band switching control can
not be effected with a paper speed of 30 mm / s.
For further information see sections 4.2 and 4 .3
Brief Details
Only
mode available, 0: dB (70 dB dyn range)
Preferred
for RMS because of 70 dB dynamic
range,
0: dB
As 2606 above, 0: dB
Not possible
Not possible
Better signal averaging for Impulse and Peak
measurement but reduced dynamic range
(31 dB), 0: dB
Better
signal averaging for RMS, Impulse and
Peak measurement, 0: dB
Abnormal setting - gives log log results
Not possible
Reduced dynamic range, 0: volts
Reduced dynamic range, 0: volts
50
dB dynamic range, 0: volts
770408
Table 3. 1. Type 2306 Recording Modes with different Measuring
Amplifiers