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2. The controls on the 2010 should be selected according to the type of
analysis being made. Reference should be made to sections 4.1 to 4.4
on measurements, and also to Appendix section
9
for information on
use of B & T programmes.
3.
Set the control knobs on the Level Recorder to:
POTENTIOMETER RANGE
RECTI Fl ER RESPONSE
WRITING SPEED
LOWER LIMITING FREQUENCY
POWER
MOTOR (2305)
}
PEN DRIVE (2307)
According to potentiometer
used
"DC"
As required. See table
6.1
Any value on 2307, or any value
below "200
Hz"
for 2305,
consistent with stable operation
of the Recorder
"On"
"On"
4. The INPUT POTENTIOMETER and the INPUT ATTENUATOR of
the Level Recorder can be adjusted so that the pen deflection cor-
responds to the meter deflection on the 2010. To do this set the
READ OUT SELECTOR to "DC" and calibrate the instrument as
described under the appropriate section for voltage, sound or vibra-
tion in section 3.2.
64
SOUND
a) Using a Pistonphone (124 dB) or Sound Level Calibrator (94 dB)
the pen should be adjusted to 4 dB above one of the thick lines on
the Recording Paper. The thick line then corresponds to 120 or
90 dB respectively.
b) Using the 50 mV RMS RefereAce Signal provided in the 2010
adjust the meter deflection to correspond to the Microphone open
circuit sensitivity given on the microphone calibration chart. Note
the equivalent value on the dB scale, and set the pen deflection to
this value on the recording paper.
VIBRATION
a) When Accelerometer Calibrator 4291 or 4292 is used, 0.707 g RMS
corresponds to 3 dB below full scale. The pen should be set to 3 dB
below one of the thick lines on the recording paper. The thick line
will then correspond to an acceleration level of 1 g RMS.
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