Casella CEL CEL-63X - Manual (Page 64)

CEL-63x Environmental & Occupational Noise Meter
64 Casella CEL
impedance should be as high as possible, and a coaxial
connection cable of between 0.5 metres and 10 metres length
should be used.
The AC output corresponds to the Z-weighted response of the
instrument.
DC output 2.5 mm stereo jack (barrel ground, ring DC output) provided
for chart recorders, loggers and so on. Some offset and scaling
is necessary on the measuring system for accurate
measurements.
Approximately 1.4 V DC full-scale output corresponding to
140 dB. Output impedance is approximately 2.2 kΩ. Load
impedance should be as high as possible.
The DC output corresponds to the A-weighted, fast time
response of the instrument.
Note that the DC power input ground must be kept isolated
from any signal ground.
6.29 Available data sets
A) Broadband Cumulative and Periodic Results
For each complete measurement run the instrument stores the following:
Run start Date and Time
Run duration
Run overload time
Run pause times
Run Id
Instrument serial number
Current measurement setup data
The Last calibration before run started results
The First calibration after end of run results
The Overload and Battery fail flags
The Environmental indices LDN, LDEN, CNEL
In periodic mode the following set of results is produced for each of the period
intervals during a run.
In cumulative mode the following single set of results is produced covering the
whole run.