18
7.
Calibration
Adjustment:
This screwdriver adjustment, located under a metal cap
on the side of the Instrument, is used to calibrate the 884-
2. The Simpson Sound Level Calibrator, Model 890-2, is
designed to calibrate the 884-2. The calibration procedures
are contained in the operator's manual for the 890-2.
8.
Battery
Compartment:
The battery compartment, which is totally separated from
the electronics, houses the battery.
4.3
Sound Level Measurements
To obtain sound level measurements with the 884-2:
a.
Turn on the Instrument and select the desired measurement range. To en-
sure accurate results, check the battery every time sound level measure-
ments are made.
b.
When the Instrument is hand-held, orientate the microphone approximately
45° to 70° with respect to the horizontal plane and at an angle of 70° with
respect to incoming sound waves.
c.
For OSHA compliance measurement set FAST/SLOW switch to SLOW and
the range switch to OSHA. Read exact dB(A) on red OSHA arc.
d.
For other applications, select the desired range, weighting, and response. If
the meter fluctuations are in excess of 3 dB set the response to SLOW
position.
NOTE:
With the range switch set to any of the other ranges (black numerals), the
black indicator, and the switch position corresponds to zero (0) indication. For
example, if switch is set to 90, and the indication is 5, add 5 to 90 to obtain 95 dB
level.
e.
When not in use return the range switch to the OFF position and store the
Sound Level Meter in a safe place.
4.4
Use With Auxiliary Equipment
The 884-2 is equipped with three outputs intended to be used with auxiliary
equipment such as a chart recorder, oscilloscope or the Simpson 898 Octave
Band Filter. These jacks are designed to give the operator more detailed and
comprehensive sound analysis study. The larger of the three jacks is designed to
be used with the Simpson 898 Octave Band Filter. The operator's manual for the
Model 898 describes how to use the 884-2 with this filter.
Non-Linear Distortion: At frequencies from 30 Hz to 50 Hz, the AC output will have
observable distortion with levels exceeding 0 dB on any meter range.
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